[rtems commit] shell: Add a ping command.

Chris Johns chrisj at rtems.org
Tue Sep 16 05:11:06 UTC 2014


Module:    rtems
Branch:    master
Commit:    a8fa078f1efcc682f7155ab7423543d7d582f80a
Changeset: http://git.rtems.org/rtems/commit/?id=a8fa078f1efcc682f7155ab7423543d7d582f80a

Author:    Chris Johns <chrisj at rtems.org>
Date:      Mon Sep 15 08:00:18 2014 +1000

shell: Add a ping command.

The ping code is taken from a recent FreeBSD release. Some options have been
tested, other not tested or do not work. This could be due to the age of
our TCP/IP stack.

This version of ping will not work if more than 64 file descriptors are
open at once because the select FD size is 64 as set in newlib.

---

 cpukit/libmisc/Makefile.am         |    2 +-
 cpukit/libmisc/shell/main_ping.c   | 1976 ++++++++++++++++++++++++++++++++++++
 cpukit/libmisc/shell/shellconfig.h |    7 +
 cpukit/libmisc/shell/sysexits.h    |  116 +++
 doc/shell/network.t                |  311 ++++++-
 5 files changed, 2390 insertions(+), 22 deletions(-)

diff --git a/cpukit/libmisc/Makefile.am b/cpukit/libmisc/Makefile.am
index 421ddef..bcf8ff0 100644
--- a/cpukit/libmisc/Makefile.am
+++ b/cpukit/libmisc/Makefile.am
@@ -84,7 +84,7 @@ libshell_a_SOURCES = shell/cat_file.c shell/cmds.c shell/internal.h \
     shell/main_mallocinfo.c shell/main_mdump.c shell/main_medit.c \
     shell/main_mfill.c shell/main_mkdir.c shell/main_mount.c \
     shell/main_mmove.c shell/main_msdosfmt.c \
-    shell/main_mv.c shell/main_perioduse.c \
+    shell/main_mv.c shell/main_perioduse.c shell/main_ping.c \
     shell/main_pwd.c shell/main_rm.c shell/main_rmdir.c shell/main_sleep.c \
     shell/main_stackuse.c shell/main_tty.c shell/main_umask.c \
     shell/main_unmount.c shell/main_blksync.c shell/main_whoami.c \
diff --git a/cpukit/libmisc/shell/main_ping.c b/cpukit/libmisc/shell/main_ping.c
new file mode 100644
index 0000000..a13d726
--- /dev/null
+++ b/cpukit/libmisc/shell/main_ping.c
@@ -0,0 +1,1976 @@
+#ifdef __rtems__
+#define __need_getopt_newlib
+#include <getopt.h>
+#endif
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Mike Muuss.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if !__rtems__
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1989, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)ping.c	8.1 (Berkeley) 6/5/93";
+#endif /* not lint */
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ *			P I N G . C
+ *
+ * Using the Internet Control Message Protocol (ICMP) "ECHO" facility,
+ * measure round-trip-delays and packet loss across network paths.
+ *
+ * Author -
+ *	Mike Muuss
+ *	U. S. Army Ballistic Research Laboratory
+ *	December, 1983
+ *
+ * Status -
+ *	Public Domain.  Distribution Unlimited.
+ * Bugs -
+ *	More statistics could always be gathered.
+ *	This program has to run SUID to ROOT to access the ICMP socket.
+ */
+
+#include <sys/param.h>		/* NB: we rely on this for <sys/types.h> */
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <sys/time.h>
+#include <sys/uio.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+#include <netinet/ip_var.h>
+#include <arpa/inet.h>
+
+#ifdef IPSEC
+#include <netipsec/ipsec.h>
+#endif /*IPSEC*/
+
+#include <ctype.h>
+//#include <err.h>
+#include <errno.h>
+#include <math.h>
+#include <netdb.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+//#include <sysexits.h>
+#include <unistd.h>
+
+#include "err.h"
+#include "sysexits.h"
+#include <sys/select.h>
+
+#define	INADDR_LEN	((int)sizeof(in_addr_t))
+#define	TIMEVAL_LEN	((int)sizeof(struct tv32))
+#define	MASK_LEN	(ICMP_MASKLEN - ICMP_MINLEN)
+#define	TS_LEN		(ICMP_TSLEN - ICMP_MINLEN)
+#define	DEFDATALEN	56		/* default data length */
+#define	FLOOD_BACKOFF	20000		/* usecs to back off if F_FLOOD mode */
+					/* runs out of buffer space */
+#define	MAXIPLEN	(sizeof(struct ip) + MAX_IPOPTLEN)
+#define	MAXICMPLEN	(ICMP_ADVLENMIN + MAX_IPOPTLEN)
+#define	MAXWAIT		10000		/* max ms to wait for response */
+#define	MAXALARM	(60 * 60)	/* max seconds for alarm timeout */
+#define	MAXTOS		255
+
+#define	A(bit)		rcvd_tbl[(bit)>>3]	/* identify byte in array */
+#define	B(bit)		(1 << ((bit) & 0x07))	/* identify bit in byte */
+#define	SET(bit)	(A(bit) |= B(bit))
+#define	CLR(bit)	(A(bit) &= (~B(bit)))
+#define	TST(bit)	(A(bit) & B(bit))
+
+struct tv32 {
+	int32_t tv32_sec;
+	int32_t tv32_usec;
+};
+
+/* various options */
+#if !__rtems__
+int options;
+#endif
+#define	F_FLOOD		0x0001
+#define	F_INTERVAL	0x0002
+#define	F_NUMERIC	0x0004
+#define	F_PINGFILLED	0x0008
+#define	F_QUIET		0x0010
+#define	F_RROUTE	0x0020
+#define	F_SO_DEBUG	0x0040
+#define	F_SO_DONTROUTE	0x0080
+#define	F_VERBOSE	0x0100
+#define	F_QUIET2	0x0200
+#define	F_NOLOOP	0x0400
+#define	F_MTTL		0x0800
+#define	F_MIF		0x1000
+#define	F_AUDIBLE	0x2000
+#ifdef IPSEC
+#ifdef IPSEC_POLICY_IPSEC
+#define F_POLICY	0x4000
+#endif /*IPSEC_POLICY_IPSEC*/
+#endif /*IPSEC*/
+#define	F_TTL		0x8000
+#define	F_MISSED	0x10000
+#define	F_ONCE		0x20000
+#define	F_HDRINCL	0x40000
+#define	F_MASK		0x80000
+#define	F_TIME		0x100000
+#define	F_SWEEP		0x200000
+#define	F_WAITTIME	0x400000
+
+/*
+ * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
+ * number of received sequence numbers we can keep track of.  Change 128
+ * to 8192 for complete accuracy...
+ */
+#define	MAX_DUP_CHK	(8 * 128)
+#if !__rtems__
+int mx_dup_ck = MAX_DUP_CHK;
+char rcvd_tbl[MAX_DUP_CHK / 8];
+
+struct sockaddr_in whereto;	/* who to ping */
+int datalen = DEFDATALEN;
+int maxpayload;
+int s;				/* socket file descriptor */
+u_char outpackhdr[IP_MAXPACKET], *outpack;
+#endif
+char BBELL = '\a';		/* characters written for MISSED and AUDIBLE */
+char BSPACE = '\b';		/* characters written for flood */
+char DOT = '.';
+#if !__rtems__
+char *hostname;
+char *shostname;
+int ident;			/* process id to identify our packets */
+int uid;			/* cached uid for micro-optimization */
+u_char icmp_type = ICMP_ECHO;
+u_char icmp_type_rsp = ICMP_ECHOREPLY;
+int phdr_len = 0;
+int send_len;
+
+/* counters */
+long nmissedmax;		/* max value of ntransmitted - nreceived - 1 */
+long npackets;			/* max packets to transmit */
+long nreceived;			/* # of packets we got back */
+long nrepeats;			/* number of duplicates */
+long ntransmitted;		/* sequence # for outbound packets = #sent */
+long snpackets;			/* max packets to transmit in one sweep */
+long snreceived;		/* # of packets we got back in this sweep */
+long sntransmitted;		/* # of packets we sent in this sweep */
+int sweepmax;			/* max value of payload in sweep */
+int sweepmin = 0;		/* start value of payload in sweep */
+int sweepincr = 1;		/* payload increment in sweep */
+int interval = 1000;		/* interval between packets, ms */
+int waittime = MAXWAIT;		/* timeout for each packet */
+long nrcvtimeout = 0;		/* # of packets we got back after waittime */
+
+/* timing */
+int timing;			/* flag to do timing */
+double tmin = 999999999.0;	/* minimum round trip time */
+double tmax = 0.0;		/* maximum round trip time */
+double tsum = 0.0;		/* sum of all times, for doing average */
+double tsumsq = 0.0;		/* sum of all times squared, for std. dev. */
+
+volatile sig_atomic_t finish_up;  /* nonzero if we've been told to finish up */
+volatile sig_atomic_t siginfo_p;
+
+static void fill(char *, char *);
+static u_short in_cksum(u_short *, int);
+static void check_status(void);
+static void finish(void) __dead2;
+static void pinger(void);
+static char *pr_addr(struct in_addr);
+static char *pr_ntime(n_time);
+static void pr_icmph(struct icmp *);
+static void pr_iph(struct ip *);
+static void pr_pack(char *, int, struct sockaddr_in *, struct timeval *);
+static void pr_retip(struct ip *);
+static void status(int);
+static void stopit(int);
+static void tvsub(struct timeval *, struct timeval *);
+static void usage(void) __dead2;
+#endif
+
+#if __rtems__
+#define _ALIGNBYTES     CPU_ALIGNMENT
+#define _ALIGN(p)       (((uintptr_t)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
+#define CMSG_SPACE(l)   (_ALIGN(sizeof(struct cmsghdr)) + _ALIGN(l))
+#define CMSG_LEN(l)     (_ALIGN(sizeof(struct cmsghdr)) + (l))
+typedef struct
+{
+  int options;
+  int mx_dup_ck;
+  char rcvd_tbl[MAX_DUP_CHK / 8];
+  struct sockaddr_in whereto;
+  int datalen;
+  int maxpayload;
+  int s;
+  u_char outpackhdr[IP_MAXPACKET];
+  u_char *outpack;
+  char *hostname;
+  char *shostname;
+  int ident;
+  int uid;
+  u_char icmp_type;
+  u_char icmp_type_rsp;
+  int phdr_len;
+  int send_len;
+  long nmissedmax;
+  long npackets;
+  long nreceived;
+  long nrepeats;
+  long ntransmitted;
+  long snpackets;
+  long snreceived;
+  long sntransmitted;
+  int sweepmax;
+  int sweepmin;
+  int sweepincr;
+  int interval;
+  int waittime;
+  long nrcvtimeout;
+  int timing;
+  double tmin;
+  double tmax;
+  double tsum;
+  double tsumsq;
+  volatile sig_atomic_t finish_up;
+  volatile sig_atomic_t siginfo_p;
+
+  /* main */
+  u_char packet[IP_MAXPACKET] __aligned(4);
+
+  /* pr_pack */
+	int old_rrlen;
+	char old_rr[MAX_IPOPTLEN];
+
+  int exit_code;
+  jmp_buf exit_jmp;
+} rtems_shell_globals_t;
+
+#define options_ globals->options
+#define mx_dup_ck globals->mx_dup_ck
+#define rcvd_tbl globals->rcvd_tbl
+#define whereto globals->whereto
+#define datalen globals->datalen
+#define maxpayload globals->maxpayload
+#define s globals->s
+#define outpackhdr globals->outpackhdr
+#define outpack globals->outpack
+#define hostname globals->hostname
+#define shostname globals->shostname
+#define ident globals->ident
+#define uid globals->uid
+#define icmp_type_ globals->icmp_type
+#define icmp_type_rsp globals->icmp_type_rsp
+#define phdr_len globals->phdr_len
+#define send_len globals->send_len
+#define nmissedmax globals->nmissedmax
+#define npackets globals->npackets
+#define nreceived globals->nreceived
+#define nrepeats globals->nrepeats
+#define ntransmitted globals->ntransmitted
+#define snpackets globals->snpackets
+#define snreceived globals->snreceived
+#define sntransmitted globals->sntransmitted
+#define sweepmax globals->sweepmax
+#define sweepmin globals->sweepmin
+#define sweepincr globals->sweepincr
+#define interval globals->interval
+#define waittime globals->waittime
+#define nrcvtimeout globals->nrcvtimeout
+#define timing globals->timing
+#define tmin globals->tmin
+#define tmax globals->tmax
+#define tsum globals->tsum
+#define tsumsq globals->tsumsq
+#define finish_up globals->finish_up
+#define siginfo_p globals->siginfo_p
+
+#define old_rrlen globals->old_rrlen
+#define old_rr globals->old_rr
+
+#define packet_ globals->packet
+
+static u_short in_cksum(u_short *, int);
+static char *pr_ntime(n_time);
+static void pr_icmph(struct icmp *);
+static void pr_iph(struct ip *);
+static void pr_retip(struct ip *);
+static void status(int);
+static void stopit(int);
+static void tvsub(struct timeval *, struct timeval *);
+
+#define fill(_a1, _a2)  g_fill(_a1, _a2, globals)
+static void g_fill(char *_a1, char *_a2, rtems_shell_globals_t* globals);
+
+#define check_status() g_check_status(globals)
+static void g_check_status(rtems_shell_globals_t* globals);
+
+#define finish() g_finish(globals)
+static void g_finish(rtems_shell_globals_t* globals) __dead2;
+
+#define pinger() g_pinger(globals)
+static void g_pinger(rtems_shell_globals_t* globals);
+
+#define pr_addr(_a1) g_pr_addr(_a1, globals)
+static char *g_pr_addr(struct in_addr, rtems_shell_globals_t* globals);
+
+#define pr_pack(_a1, _a2, _a3, _a4) g_pr_pack(_a1, _a2, _a3, _a4, globals)
+static void g_pr_pack(char *, int, struct sockaddr_in *, struct timeval *, rtems_shell_globals_t* globals);
+
+#define usage() g_usage(globals)
+static void g_usage(rtems_shell_globals_t* globals) __dead2;
+
+void
+rtems_shell_ping_exit (rtems_shell_globals_t* globals, int code)
+{
+  globals->exit_code = code;
+  longjmp (globals->exit_jmp, 1);
+}
+
+#define exit(_c) rtems_shell_ping_exit (globals, _c)
+#define _exit(_c) exit(_c)
+
+static int main_ping(int argc, char *const *argv, rtems_shell_globals_t* globals);
+static int rtems_shell_main_ping(int argc, char *argv[])
+{
+  rtems_shell_globals_t* globals = malloc(sizeof(rtems_shell_globals_t));
+  if (!globals)
+  {
+    printf("error: no memory\n");
+    return 1;
+  }
+  memset (globals, 0, sizeof (rtems_shell_globals_t));
+  npackets = 5;
+  datalen = DEFDATALEN;
+  icmp_type_ = ICMP_ECHO;
+  icmp_type_rsp = ICMP_ECHOREPLY;
+  phdr_len = 0;
+  sweepmin = 0;
+  sweepincr = 1;
+  interval = 1000;
+  waittime = MAXWAIT;
+  nrcvtimeout = 0;
+  tmin = 999999999.0;
+  tmax = 0.0;
+  tsum = 0.0;
+  tsumsq = 0.0;
+  globals->exit_code = 1;
+  if (setjmp (globals->exit_jmp) == 0)
+    return main_ping (argc, argv, globals);
+  return globals->exit_code;
+}
+#endif
+
+
+
+int
+#ifdef __rtems__
+main_ping(argc, argv, globals)
+#else
+main(argc, argv)
+#endif
+	int argc;
+	char *const *argv;
+  rtems_shell_globals_t* globals;
+{
+	struct sockaddr_in from, sock_in;
+	struct in_addr ifaddr;
+	struct timeval last, intvl;
+	struct iovec iov;
+	struct ip *ip;
+	struct msghdr msg;
+	struct sigaction si_sa;
+	size_t sz;
+#if !__rtems__
+	u_char *datap, packet[IP_MAXPACKET] __aligned(4);
+#else
+	u_char *datap;
+#endif
+	char *ep, *source, *target, *payload;
+	struct hostent *hp;
+#ifdef IPSEC_POLICY_IPSEC
+	char *policy_in, *policy_out;
+#endif
+	struct sockaddr_in *to;
+	double t;
+	u_long alarmtimeout, ultmp;
+	int almost_done, ch, df, hold, i, icmp_len, mib[4], preload, sockerrno,
+	    tos, ttl;
+	char ctrl[CMSG_SPACE(sizeof(struct timeval))];
+	char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN];
+#ifdef IP_OPTIONS
+	char rspace[MAX_IPOPTLEN];	/* record route space */
+#endif
+	unsigned char loop, mttl;
+#ifdef __rtems__
+	struct getopt_data getopt_reent;
+#define optarg getopt_reent.optarg
+#define optind getopt_reent.optind
+#define opterr getopt.reent.opterr
+#define optopt getopt.reent.optopt
+#endif
+
+	payload = source = NULL;
+#ifdef IPSEC_POLICY_IPSEC
+	policy_in = policy_out = NULL;
+#endif
+
+	/*
+	 * Do the stuff that we need root priv's for *first*, and
+	 * then drop our setuid bit.  Save error reporting for
+	 * after arg parsing.
+	 */
+	s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
+	sockerrno = errno;
+
+	setuid(getuid());
+	uid = getuid();
+
+	alarmtimeout = df = preload = tos = 0;
+
+	outpack = outpackhdr + sizeof(struct ip);
+#ifdef __rtems__
+	memset(&getopt_reent, 0, sizeof(getopt_data));
+	while ((ch = getopt_r(argc, argv,
+#else
+	while ((ch = getopt(argc, argv,
+#endif
+		"Aac:DdfG:g:h:I:i:Ll:M:m:nop:QqRrS:s:T:t:vW:z:"
+#ifdef IPSEC
+#ifdef IPSEC_POLICY_IPSEC
+		"P:"
+#endif /*IPSEC_POLICY_IPSEC*/
+#endif /*IPSEC*/
+#ifdef __rtems__
+		, &getopt_reent
+#endif
+		)) != -1)
+	{
+		switch(ch) {
+		case 'A':
+			options_ |= F_MISSED;
+			break;
+		case 'a':
+			options_ |= F_AUDIBLE;
+			break;
+		case 'c':
+			ultmp = strtoul(optarg, &ep, 0);
+			if (*ep || ep == optarg || ultmp > LONG_MAX || !ultmp)
+				errx(&globals->exit_jmp, EX_USAGE,
+				    "invalid count of packets to transmit: `%s'",
+				    optarg);
+			npackets = ultmp;
+			break;
+		case 'D':
+			options_ |= F_HDRINCL;
+			df = 1;
+			break;
+		case 'd':
+			options_ |= F_SO_DEBUG;
+			break;
+		case 'f':
+			if (uid) {
+				errno = EPERM;
+				err(&globals->exit_jmp, EX_NOPERM, "-f flag");
+			}
+			options_ |= F_FLOOD;
+			setbuf(stdout, (char *)NULL);
+			break;
+		case 'G': /* Maximum packet size for ping sweep */
+			ultmp = strtoul(optarg, &ep, 0);
+			if (*ep || ep == optarg)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid packet size: `%s'",
+				    optarg);
+			if (uid != 0 && ultmp > DEFDATALEN) {
+				errno = EPERM;
+				err(&globals->exit_jmp, EX_NOPERM,
+				    "packet size too large: %lu > %u",
+				    ultmp, DEFDATALEN);
+			}
+			options_ |= F_SWEEP;
+			sweepmax = ultmp;
+			break;
+		case 'g': /* Minimum packet size for ping sweep */
+			ultmp = strtoul(optarg, &ep, 0);
+			if (*ep || ep == optarg)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid packet size: `%s'",
+				    optarg);
+			if (uid != 0 && ultmp > DEFDATALEN) {
+				errno = EPERM;
+				err(&globals->exit_jmp, EX_NOPERM,
+				    "packet size too large: %lu > %u",
+				    ultmp, DEFDATALEN);
+			}
+			options_ |= F_SWEEP;
+			sweepmin = ultmp;
+			break;
+		case 'h': /* Packet size increment for ping sweep */
+			ultmp = strtoul(optarg, &ep, 0);
+			if (*ep || ep == optarg || ultmp < 1)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid increment size: `%s'",
+				    optarg);
+			if (uid != 0 && ultmp > DEFDATALEN) {
+				errno = EPERM;
+				err(&globals->exit_jmp, EX_NOPERM,
+				    "packet size too large: %lu > %u",
+				    ultmp, DEFDATALEN);
+			}
+			options_ |= F_SWEEP;
+			sweepincr = ultmp;
+			break;
+		case 'I':		/* multicast interface */
+			if (inet_aton(optarg, &ifaddr) == 0)
+				errx(&globals->exit_jmp, EX_USAGE,
+				    "invalid multicast interface: `%s'",
+				    optarg);
+			options_ |= F_MIF;
+			break;
+		case 'i':		/* wait between sending packets */
+			t = strtod(optarg, &ep) * 1000.0;
+			if (*ep || ep == optarg || t > (double)INT_MAX)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid timing interval: `%s'",
+				    optarg);
+			options_ |= F_INTERVAL;
+			interval = (int)t;
+			if (uid && interval < 1000) {
+				errno = EPERM;
+				err(&globals->exit_jmp, EX_NOPERM, "-i interval too short");
+			}
+			break;
+		case 'L':
+			options_ |= F_NOLOOP;
+			loop = 0;
+			break;
+		case 'l':
+			ultmp = strtoul(optarg, &ep, 0);
+			if (*ep || ep == optarg || ultmp > INT_MAX)
+				errx(&globals->exit_jmp, EX_USAGE,
+				    "invalid preload value: `%s'", optarg);
+			if (uid) {
+				errno = EPERM;
+				err(&globals->exit_jmp, EX_NOPERM, "-l flag");
+			}
+			preload = ultmp;
+			break;
+		case 'M':
+			switch(optarg[0]) {
+			case 'M':
+			case 'm':
+				options_ |= F_MASK;
+				break;
+			case 'T':
+			case 't':
+				options_ |= F_TIME;
+				break;
+			default:
+				errx(&globals->exit_jmp, EX_USAGE, "invalid message: `%c'", optarg[0]);
+				break;
+			}
+			break;
+		case 'm':		/* TTL */
+			ultmp = strtoul(optarg, &ep, 0);
+			if (*ep || ep == optarg || ultmp > MAXTTL)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid TTL: `%s'", optarg);
+			ttl = ultmp;
+			options_ |= F_TTL;
+			break;
+		case 'n':
+			options_ |= F_NUMERIC;
+			break;
+		case 'o':
+			options_ |= F_ONCE;
+			break;
+#ifdef IPSEC
+#ifdef IPSEC_POLICY_IPSEC
+		case 'P':
+			options_ |= F_POLICY;
+			if (!strncmp("in", optarg, 2))
+				policy_in = strdup(optarg);
+			else if (!strncmp("out", optarg, 3))
+				policy_out = strdup(optarg);
+			else
+				errx(&globals->exit_jmp, 1, "invalid security policy");
+			break;
+#endif /*IPSEC_POLICY_IPSEC*/
+#endif /*IPSEC*/
+		case 'p':		/* fill buffer with user pattern */
+			options_ |= F_PINGFILLED;
+			payload = optarg;
+			break;
+		case 'Q':
+			options_ |= F_QUIET2;
+			break;
+		case 'q':
+			options_ |= F_QUIET;
+			break;
+		case 'R':
+			options_ |= F_RROUTE;
+			break;
+		case 'r':
+			options_ |= F_SO_DONTROUTE;
+			break;
+		case 'S':
+			source = optarg;
+			break;
+		case 's':		/* size of packet to send */
+			ultmp = strtoul(optarg, &ep, 0);
+			if (*ep || ep == optarg)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid packet size: `%s'",
+				    optarg);
+			if (uid != 0 && ultmp > DEFDATALEN) {
+				errno = EPERM;
+				err(&globals->exit_jmp, EX_NOPERM,
+				    "packet size too large: %lu > %u",
+				    ultmp, DEFDATALEN);
+			}
+			datalen = ultmp;
+			break;
+		case 'T':		/* multicast TTL */
+			ultmp = strtoul(optarg, &ep, 0);
+			if (*ep || ep == optarg || ultmp > MAXTTL)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid multicast TTL: `%s'",
+				    optarg);
+			mttl = ultmp;
+			options_ |= F_MTTL;
+			break;
+		case 't':
+			alarmtimeout = strtoul(optarg, &ep, 0);
+			if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX))
+				errx(&globals->exit_jmp, EX_USAGE, "invalid timeout: `%s'",
+				    optarg);
+			if (alarmtimeout > MAXALARM)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid timeout: `%s' > %d",
+				    optarg, MAXALARM);
+			alarm((int)alarmtimeout);
+			break;
+		case 'v':
+			options_ |= F_VERBOSE;
+			break;
+		case 'W':		/* wait ms for answer */
+			t = strtod(optarg, &ep);
+			if (*ep || ep == optarg || t > (double)INT_MAX)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid timing interval: `%s'",
+				    optarg);
+			options_ |= F_WAITTIME;
+			waittime = (int)t;
+			break;
+		case 'z':
+			options_ |= F_HDRINCL;
+			ultmp = strtoul(optarg, &ep, 0);
+			if (*ep || ep == optarg || ultmp > MAXTOS)
+				errx(&globals->exit_jmp, EX_USAGE, "invalid TOS: `%s'", optarg);
+			tos = ultmp;
+			break;
+		default:
+			usage();
+
+		}
+	}
+
+	if (argc - optind != 1)
+		usage();
+
+	target = argv[optind];
+
+	switch (options_ & (F_MASK|F_TIME)) {
+	case 0: break;
+	case F_MASK:
+		icmp_type_ = ICMP_MASKREQ;
+		icmp_type_rsp = ICMP_MASKREPLY;
+		phdr_len = MASK_LEN;
+		if (!(options_ & F_QUIET))
+			(void)printf("ICMP_MASKREQ\n");
+		break;
+	case F_TIME:
+		icmp_type_ = ICMP_TSTAMP;
+		icmp_type_rsp = ICMP_TSTAMPREPLY;
+		phdr_len = TS_LEN;
+		if (!(options_ & F_QUIET))
+			(void)printf("ICMP_TSTAMP\n");
+		break;
+	default:
+		errx(&globals->exit_jmp, EX_USAGE, "ICMP_TSTAMP and ICMP_MASKREQ are exclusive.");
+		break;
+	}
+	icmp_len = sizeof(struct ip) + ICMP_MINLEN + phdr_len;
+	if (options_ & F_RROUTE)
+		icmp_len += MAX_IPOPTLEN;
+	maxpayload = IP_MAXPACKET - icmp_len;
+	if (datalen > maxpayload)
+		errx(&globals->exit_jmp, EX_USAGE, "packet size too large: %d > %d", datalen,
+		    maxpayload);
+	send_len = icmp_len + datalen;
+	datap = &outpack[ICMP_MINLEN + phdr_len + TIMEVAL_LEN];
+	if (options_ & F_PINGFILLED) {
+		fill((char *)datap, payload);
+	}
+	if (source) {
+		bzero((char *)&sock_in, sizeof(sock_in));
+		sock_in.sin_family = AF_INET;
+		if (inet_aton(source, &sock_in.sin_addr) != 0) {
+			shostname = source;
+		} else {
+			hp = gethostbyname2(source, AF_INET);
+			if (!hp)
+				errx(&globals->exit_jmp, EX_NOHOST, "cannot resolve %s: %s",
+				    source, hstrerror(h_errno));
+
+			sock_in.sin_len = sizeof sock_in;
+			if ((unsigned)hp->h_length > sizeof(sock_in.sin_addr) ||
+			    hp->h_length < 0)
+				errx(&globals->exit_jmp, 1, "gethostbyname2: illegal address");
+			memcpy(&sock_in.sin_addr, hp->h_addr_list[0],
+			    sizeof(sock_in.sin_addr));
+			(void)strncpy(snamebuf, hp->h_name,
+			    sizeof(snamebuf) - 1);
+			snamebuf[sizeof(snamebuf) - 1] = '\0';
+			shostname = snamebuf;
+		}
+		if (bind(s, (struct sockaddr *)&sock_in, sizeof sock_in) == -1)
+			err(&globals->exit_jmp, 1, "bind");
+	}
+
+	bzero(&whereto, sizeof(whereto));
+	to = &whereto;
+	to->sin_family = AF_INET;
+	to->sin_len = sizeof *to;
+	if (inet_aton(target, &to->sin_addr) != 0) {
+		hostname = target;
+	} else {
+		hp = gethostbyname2(target, AF_INET);
+		if (!hp)
+			errx(&globals->exit_jmp, EX_NOHOST, "cannot resolve %s: %s",
+			    target, hstrerror(h_errno));
+
+		if ((unsigned)hp->h_length > sizeof(to->sin_addr))
+			errx(&globals->exit_jmp, 1, "gethostbyname2 returned an illegal address");
+		memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr);
+		(void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1);
+		hnamebuf[sizeof(hnamebuf) - 1] = '\0';
+		hostname = hnamebuf;
+	}
+
+	if (options_ & F_FLOOD && options_ & F_INTERVAL)
+		errx(&globals->exit_jmp, EX_USAGE, "-f and -i: incompatible options");
+
+	if (options_ & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
+		errx(&globals->exit_jmp, EX_USAGE,
+		    "-f flag cannot be used with multicast destination");
+	if (options_ & (F_MIF | F_NOLOOP | F_MTTL)
+	    && !IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
+		errx(&globals->exit_jmp, EX_USAGE,
+		    "-I, -L, -T flags cannot be used with unicast destination");
+
+	if (datalen >= TIMEVAL_LEN)	/* can we time transfer */
+		timing = 1;
+
+	if (!(options_ & F_PINGFILLED))
+		for (i = TIMEVAL_LEN; i < datalen; ++i)
+			*datap++ = i;
+
+	ident = getpid() & 0xFFFF;
+
+	if (s < 0) {
+		errno = sockerrno;
+		err(&globals->exit_jmp, EX_OSERR, "socket");
+	}
+	hold = 1;
+	if (options_ & F_SO_DEBUG)
+		(void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&hold,
+		    sizeof(hold));
+	if (options_ & F_SO_DONTROUTE)
+		(void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&hold,
+		    sizeof(hold));
+#ifdef IPSEC
+#ifdef IPSEC_POLICY_IPSEC
+	if (options_ & F_POLICY) {
+		char *buf;
+		if (policy_in != NULL) {
+			buf = ipsec_set_policy(policy_in, strlen(policy_in));
+			if (buf == NULL)
+				errx(&globals->exit_jmp, EX_CONFIG, "%s", ipsec_strerror());
+			if (setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY,
+					buf, ipsec_get_policylen(buf)) < 0)
+				err(EX_CONFIG,
+				    "ipsec policy cannot be configured");
+			free(buf);
+		}
+
+		if (policy_out != NULL) {
+			buf = ipsec_set_policy(policy_out, strlen(policy_out));
+			if (buf == NULL)
+				errx(&globals->exit_jmp, EX_CONFIG, "%s", ipsec_strerror());
+			if (setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY,
+					buf, ipsec_get_policylen(buf)) < 0)
+				err(EX_CONFIG,
+				    "ipsec policy cannot be configured");
+			free(buf);
+		}
+	}
+#endif /*IPSEC_POLICY_IPSEC*/
+#endif /*IPSEC*/
+
+	if (options_ & F_HDRINCL) {
+		ip = (struct ip*)outpackhdr;
+		if (!(options_ & (F_TTL | F_MTTL))) {
+			mib[0] = CTL_NET;
+			mib[1] = PF_INET;
+			mib[2] = IPPROTO_IP;
+			mib[3] = IPCTL_DEFTTL;
+			sz = sizeof(ttl);
+			if (sysctl(mib, 4, &ttl, &sz, NULL, 0) == -1)
+				err(&globals->exit_jmp, 1, "sysctl(net.inet.ip.ttl)");
+		}
+		setsockopt(s, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold));
+		ip->ip_v = IPVERSION;
+		ip->ip_hl = sizeof(struct ip) >> 2;
+		ip->ip_tos = tos;
+		ip->ip_id = 0;
+		ip->ip_off = df ? IP_DF : 0;
+		ip->ip_ttl = ttl;
+		ip->ip_p = IPPROTO_ICMP;
+		ip->ip_src.s_addr = source ? sock_in.sin_addr.s_addr : INADDR_ANY;
+		ip->ip_dst = to->sin_addr;
+        }
+	/* record route option */
+	if (options_ & F_RROUTE) {
+#ifdef IP_OPTIONS
+		bzero(rspace, sizeof(rspace));
+		rspace[IPOPT_OPTVAL] = IPOPT_RR;
+		rspace[IPOPT_OLEN] = sizeof(rspace) - 1;
+		rspace[IPOPT_OFFSET] = IPOPT_MINOFF;
+		rspace[sizeof(rspace) - 1] = IPOPT_EOL;
+		if (setsockopt(s, IPPROTO_IP, IP_OPTIONS, rspace,
+		    sizeof(rspace)) < 0)
+			err(&globals->exit_jmp, EX_OSERR, "setsockopt IP_OPTIONS");
+#else
+		errx(&globals->exit_jmp, EX_UNAVAILABLE,
+		    "record route not available in this implementation");
+#endif /* IP_OPTIONS */
+	}
+
+	if (options_ & F_TTL) {
+		if (setsockopt(s, IPPROTO_IP, IP_TTL, &ttl,
+		    sizeof(ttl)) < 0) {
+			err(&globals->exit_jmp, EX_OSERR, "setsockopt IP_TTL");
+		}
+	}
+	if (options_ & F_NOLOOP) {
+		if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop,
+		    sizeof(loop)) < 0) {
+			err(&globals->exit_jmp, EX_OSERR, "setsockopt IP_MULTICAST_LOOP");
+		}
+	}
+	if (options_ & F_MTTL) {
+		if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &mttl,
+		    sizeof(mttl)) < 0) {
+			err(&globals->exit_jmp, EX_OSERR, "setsockopt IP_MULTICAST_TTL");
+		}
+	}
+	if (options_ & F_MIF) {
+		if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr,
+		    sizeof(ifaddr)) < 0) {
+			err(&globals->exit_jmp, EX_OSERR, "setsockopt IP_MULTICAST_IF");
+		}
+	}
+#ifdef SO_TIMESTAMP
+	{ int on = 1;
+	if (setsockopt(s, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)) < 0)
+		err(&globals->exit_jmp, EX_OSERR, "setsockopt SO_TIMESTAMP");
+	}
+#endif
+	if (sweepmax) {
+		if (sweepmin >= sweepmax)
+			errx(&globals->exit_jmp, EX_USAGE, "Maximum packet size must be greater than the minimum packet size");
+
+		if (datalen != DEFDATALEN)
+			errx(&globals->exit_jmp, EX_USAGE, "Packet size and ping sweep are mutually exclusive");
+
+		if (npackets > 0) {
+			snpackets = npackets;
+			npackets = 0;
+		} else
+			snpackets = 1;
+		datalen = sweepmin;
+		send_len = icmp_len + sweepmin;
+	}
+	if (options_ & F_SWEEP && !sweepmax)
+		errx(&globals->exit_jmp, EX_USAGE, "Maximum sweep size must be specified");
+
+	/*
+	 * When pinging the broadcast address, you can get a lot of answers.
+	 * Doing something so evil is useful if you are trying to stress the
+	 * ethernet, or just want to fill the arp cache to get some stuff for
+	 * /etc/ethers.  But beware: RFC 1122 allows hosts to ignore broadcast
+	 * or multicast pings if they wish.
+	 */
+
+	/*
+	 * XXX receive buffer needs undetermined space for mbuf overhead
+	 * as well.
+	 */
+	hold = IP_MAXPACKET + 128;
+	(void)setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
+	    sizeof(hold));
+	if (uid == 0)
+		(void)setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&hold,
+		    sizeof(hold));
+
+	if (to->sin_family == AF_INET) {
+		(void)printf("PING %s (%s)", hostname,
+		    inet_ntoa(to->sin_addr));
+		if (source)
+			(void)printf(" from %s", shostname);
+		if (sweepmax)
+			(void)printf(": (%d ... %d) data bytes\n",
+			    sweepmin, sweepmax);
+		else
+			(void)printf(": %d data bytes\n", datalen);
+
+	} else {
+		if (sweepmax)
+			(void)printf("PING %s: (%d ... %d) data bytes\n",
+			    hostname, sweepmin, sweepmax);
+		else
+			(void)printf("PING %s: %d data bytes\n", hostname, datalen);
+	}
+
+	/*
+	 * Use sigaction() instead of signal() to get unambiguous semantics,
+	 * in particular with SA_RESTART not set.
+	 */
+
+	sigemptyset(&si_sa.sa_mask);
+	si_sa.sa_flags = 0;
+
+	si_sa.sa_handler = stopit;
+	if (sigaction(SIGINT, &si_sa, 0) == -1) {
+		err(&globals->exit_jmp, EX_OSERR, "sigaction SIGINT");
+	}
+
+#ifdef SIGINFO
+	si_sa.sa_handler = status;
+	if (sigaction(SIGINFO, &si_sa, 0) == -1) {
+		err(EX_OSERR, "sigaction");
+	}
+#endif
+
+        if (alarmtimeout > 0) {
+		si_sa.sa_handler = stopit;
+		if (sigaction(SIGALRM, &si_sa, 0) == -1)
+			err(&globals->exit_jmp, EX_OSERR, "sigaction SIGALRM");
+        }
+
+	bzero(&msg, sizeof(msg));
+	msg.msg_name = (caddr_t)&from;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+#ifdef SO_TIMESTAMP
+	msg.msg_control = (caddr_t)ctrl;
+#endif
+	iov.iov_base = packet_;
+	iov.iov_len = IP_MAXPACKET;
+
+	if (preload == 0)
+		pinger();		/* send the first ping */
+	else {
+		if (npackets != 0 && preload > npackets)
+			preload = npackets;
+		while (preload--)	/* fire off them quickies */
+			pinger();
+	}
+	(void)gettimeofday(&last, NULL);
+
+	if (options_ & F_FLOOD) {
+		intvl.tv_sec = 0;
+		intvl.tv_usec = 10000;
+	} else {
+		intvl.tv_sec = interval / 1000;
+		intvl.tv_usec = interval % 1000 * 1000;
+	}
+
+	almost_done = 0;
+	while (!finish_up) {
+		struct timeval now, timeout;
+		fd_set rfds;
+		int cc, n;
+
+		check_status();
+		if ((unsigned)s >= FD_SETSIZE)
+			errx(&globals->exit_jmp, EX_OSERR, "descriptor too large");
+		FD_ZERO(&rfds);
+		FD_SET(s, &rfds);
+		(void)gettimeofday(&now, NULL);
+		timeout.tv_sec = last.tv_sec + intvl.tv_sec - now.tv_sec;
+		timeout.tv_usec = last.tv_usec + intvl.tv_usec - now.tv_usec;
+		while (timeout.tv_usec < 0) {
+			timeout.tv_usec += 1000000;
+			timeout.tv_sec--;
+		}
+		while (timeout.tv_usec >= 1000000) {
+			timeout.tv_usec -= 1000000;
+			timeout.tv_sec++;
+		}
+		if (timeout.tv_sec < 0)
+			timeout.tv_sec = timeout.tv_usec = 0;
+		n = select(s + 1, &rfds, NULL, NULL, &timeout);
+		if (n < 0)
+			continue;	/* Must be EINTR. */
+		if (n == 1) {
+			struct timeval *tv = NULL;
+#ifdef SO_TIMESTAMP
+			struct cmsghdr *cmsg = (struct cmsghdr *)&ctrl;
+
+			msg.msg_controllen = sizeof(ctrl);
+#endif
+
+	bzero(&msg, sizeof(msg));
+	msg.msg_name = (caddr_t)&from;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+#ifdef SO_TIMESTAMP
+	msg.msg_control = (caddr_t)ctrl;
+#endif
+	iov.iov_base = packet_;
+	iov.iov_len = IP_MAXPACKET;
+
+			msg.msg_namelen = sizeof(from);
+			if ((cc = recvmsg(s, &msg, 0)) < 0) {
+				if (errno == EINTR)
+					continue;
+				warn("recvmsg");
+				continue;
+			}
+#ifdef SO_TIMESTAMP
+			if (cmsg->cmsg_level == SOL_SOCKET &&
+			    cmsg->cmsg_type == SCM_TIMESTAMP &&
+			    cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) {
+				/* Copy to avoid alignment problems: */
+				memcpy(&now, CMSG_DATA(cmsg), sizeof(now));
+				tv = &now;
+			}
+#endif
+			if (tv == NULL) {
+				(void)gettimeofday(&now, NULL);
+				tv = &now;
+			}
+			pr_pack((char *)packet_, cc, &from, tv);
+			if ((options_ & F_ONCE && nreceived) ||
+			    (npackets && nreceived >= npackets))
+				break;
+		}
+		if (n == 0 || options_ & F_FLOOD) {
+			if (sweepmax && sntransmitted == snpackets) {
+				for (i = 0; i < sweepincr ; ++i)
+					*datap++ = i;
+				datalen += sweepincr;
+				if (datalen > sweepmax)
+					break;
+				send_len = icmp_len + datalen;
+				sntransmitted = 0;
+			}
+			if (!npackets || ntransmitted < npackets)
+				pinger();
+			else {
+				if (almost_done)
+					break;
+				almost_done = 1;
+				intvl.tv_usec = 0;
+				if (nreceived) {
+					intvl.tv_sec = 2 * tmax / 1000;
+					if (!intvl.tv_sec)
+						intvl.tv_sec = 1;
+				} else {
+					intvl.tv_sec = waittime / 1000;
+					intvl.tv_usec = waittime % 1000 * 1000;
+				}
+			}
+			(void)gettimeofday(&last, NULL);
+			if (ntransmitted - nreceived - 1 > nmissedmax) {
+				nmissedmax = ntransmitted - nreceived - 1;
+				if (options_ & F_MISSED)
+					(void)write(STDOUT_FILENO, &BBELL, 1);
+			}
+		}
+	}
+	finish();
+#ifdef __rtems__
+	/* RTEMS shell programs return -- they do not exit */
+	if (nreceived)
+		return(0);
+	else
+		return(2);
+#endif
+	/* NOTREACHED */
+	exit(0);	/* Make the compiler happy */
+}
+
+/*
+ * stopit --
+ *	Set the global bit that causes the main loop to quit.
+ * Do NOT call finish() from here, since finish() does far too much
+ * to be called from a signal handler.
+ */
+void
+stopit(sig)
+	int sig __unused;
+{
+#if !__rtems__
+	/*
+	 * When doing reverse DNS lookups, the finish_up flag might not
+	 * be noticed for a while.  Just exit if we get a second SIGINT.
+	 */
+	if (!(options_ & F_NUMERIC) && finish_up)
+		_exit(nreceived ? 0 : 2);
+	finish_up = 1;
+#endif
+}
+
+/*
+ * pinger --
+ *	Compose and transmit an ICMP ECHO REQUEST packet.  The IP packet
+ * will be added on by the kernel.  The ID field is our UNIX process ID,
+ * and the sequence number is an ascending integer.  The first TIMEVAL_LEN
+ * bytes of the data portion are used to hold a UNIX "timeval" struct in
+ * host byte-order, to compute the round-trip time.
+ */
+static void
+g_pinger(globals)
+  rtems_shell_globals_t* globals;
+{
+	struct timeval now;
+	struct tv32 tv32;
+	struct ip *ip;
+	struct icmp *icp;
+	int cc, i;
+	u_char *packet;
+
+	packet = outpack;
+	icp = (struct icmp *)outpack;
+	icp->icmp_type = icmp_type_;
+	icp->icmp_code = 0;
+	icp->icmp_cksum = 0;
+	icp->icmp_seq = htons(ntransmitted);
+	icp->icmp_id = ident;			/* ID */
+
+	CLR(ntransmitted % mx_dup_ck);
+
+	if ((options_ & F_TIME) || timing) {
+		(void)gettimeofday(&now, NULL);
+
+		tv32.tv32_sec = htonl(now.tv_sec);
+		tv32.tv32_usec = htonl(now.tv_usec);
+		if (options_ & F_TIME)
+			icp->icmp_otime = htonl((now.tv_sec % (24*60*60))
+				* 1000 + now.tv_usec / 1000);
+		if (timing)
+			bcopy((void *)&tv32,
+			    (void *)&outpack[ICMP_MINLEN + phdr_len],
+			    sizeof(tv32));
+	}
+
+	cc = ICMP_MINLEN + phdr_len + datalen;
+
+	/* compute ICMP checksum here */
+	icp->icmp_cksum = in_cksum((u_short *)icp, cc);
+
+	if (options_ & F_HDRINCL) {
+		cc += sizeof(struct ip);
+		ip = (struct ip *)outpackhdr;
+		ip->ip_len = cc;
+		ip->ip_sum = in_cksum((u_short *)outpackhdr, cc);
+		packet = outpackhdr;
+	}
+	i = sendto(s, (char *)packet, cc, 0, (struct sockaddr *)&whereto,
+	    sizeof(whereto));
+
+	if (i < 0 || i != cc)  {
+		if (i < 0) {
+			if (options_ & F_FLOOD && errno == ENOBUFS) {
+				usleep(FLOOD_BACKOFF);
+				return;
+			}
+			warn("sendto");
+		} else {
+			warn("%s: partial write: %d of %d bytes",
+			     hostname, i, cc);
+		}
+	}
+	ntransmitted++;
+	sntransmitted++;
+	if (!(options_ & F_QUIET) && options_ & F_FLOOD)
+		(void)write(STDOUT_FILENO, &DOT, 1);
+}
+
+/*
+ * pr_pack --
+ *	Print out the packet, if it came from us.  This logic is necessary
+ * because ALL readers of the ICMP socket get a copy of ALL ICMP packets
+ * which arrive ('tis only fair).  This permits multiple copies of this
+ * program to be run without having intermingled output (or statistics!).
+ */
+static void
+g_pr_pack(buf, cc, from, tv, globals)
+	char *buf;
+	int cc;
+	struct sockaddr_in *from;
+	struct timeval *tv;
+  rtems_shell_globals_t* globals;
+{
+	struct in_addr ina;
+	u_char *cp, *dp;
+	struct icmp *icp;
+	struct ip *ip;
+	const void *tp;
+	double triptime;
+	int dupflag, hlen, i, j, recv_len, seq;
+#if !__rtems__
+	static int old_rrlen;
+	static char old_rr[MAX_IPOPTLEN];
+#endif
+
+	/* Check the IP header */
+	ip = (struct ip *)buf;
+	hlen = ip->ip_hl << 2;
+	recv_len = cc;
+	if (cc < hlen + ICMP_MINLEN) {
+		if (options_ & F_VERBOSE)
+			warn("packet too short (%d bytes) from %s", cc,
+			     inet_ntoa(from->sin_addr));
+		return;
+	}
+
+	/* Now the ICMP part */
+	cc -= hlen;
+	icp = (struct icmp *)(buf + hlen);
+	if (icp->icmp_type == icmp_type_rsp) {
+		if (icp->icmp_id != ident)
+			return;			/* 'Twas not our ECHO */
+		++nreceived;
+		triptime = 0.0;
+		if (timing) {
+			struct timeval tv1;
+			struct tv32 tv32;
+#ifndef icmp_data
+			tp = &icp->icmp_ip;
+#else
+			tp = icp->icmp_data;
+#endif
+			tp = (const char *)tp + phdr_len;
+
+			if (cc - ICMP_MINLEN - phdr_len >= (int) sizeof(tv1)) {
+				/* Copy to avoid alignment problems: */
+				memcpy(&tv32, tp, sizeof(tv32));
+				tv1.tv_sec = ntohl(tv32.tv32_sec);
+				tv1.tv_usec = ntohl(tv32.tv32_usec);
+				tvsub(tv, &tv1);
+ 				triptime = ((double)tv->tv_sec) * 1000.0 +
+ 				    ((double)tv->tv_usec) / 1000.0;
+				tsum += triptime;
+				tsumsq += triptime * triptime;
+				if (triptime < tmin)
+					tmin = triptime;
+				if (triptime > tmax)
+					tmax = triptime;
+			} else
+				timing = 0;
+		}
+
+		seq = ntohs(icp->icmp_seq);
+
+		if (TST(seq % mx_dup_ck)) {
+			++nrepeats;
+			--nreceived;
+			dupflag = 1;
+		} else {
+			SET(seq % mx_dup_ck);
+			dupflag = 0;
+		}
+
+		if (options_ & F_QUIET)
+			return;
+
+		if (options_ & F_WAITTIME && triptime > waittime) {
+			++nrcvtimeout;
+			return;
+		}
+
+		if (options_ & F_FLOOD)
+			(void)write(STDOUT_FILENO, &BSPACE, 1);
+		else {
+			(void)printf("%d bytes from %s: icmp_seq=%u", cc,
+			   inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr),
+			   seq);
+			(void)printf(" ttl=%d", ip->ip_ttl);
+			if (timing)
+				(void)printf(" time=%.3f ms", triptime);
+			if (dupflag)
+				(void)printf(" (DUP!)");
+			if (options_ & F_AUDIBLE)
+				(void)write(STDOUT_FILENO, &BBELL, 1);
+			if (options_ & F_MASK) {
+				/* Just prentend this cast isn't ugly */
+				(void)printf(" mask=%s",
+					pr_addr(*(struct in_addr *)&(icp->icmp_mask)));
+			}
+			if (options_ & F_TIME) {
+				(void)printf(" tso=%s", pr_ntime(icp->icmp_otime));
+				(void)printf(" tsr=%s", pr_ntime(icp->icmp_rtime));
+				(void)printf(" tst=%s", pr_ntime(icp->icmp_ttime));
+			}
+			if (recv_len != send_len) {
+                        	(void)printf(
+				     "\nwrong total length %d instead of %d",
+				     recv_len, send_len);
+			}
+			/* check the data */
+			cp = (u_char*)&icp->icmp_data[phdr_len];
+			dp = &outpack[ICMP_MINLEN + phdr_len];
+			cc -= ICMP_MINLEN + phdr_len;
+			i = 0;
+			if (timing) {   /* don't check variable timestamp */
+				cp += TIMEVAL_LEN;
+				dp += TIMEVAL_LEN;
+				cc -= TIMEVAL_LEN;
+				i += TIMEVAL_LEN;
+			}
+			for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) {
+				if (*cp != *dp) {
+	(void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x",
+	    i, *dp, *cp);
+					(void)printf("\ncp:");
+					cp = (u_char*)&icp->icmp_data[0];
+					for (i = 0; i < datalen; ++i, ++cp) {
+						if ((i % 16) == 8)
+							(void)printf("\n\t");
+						(void)printf("%2x ", *cp);
+					}
+					(void)printf("\ndp:");
+					cp = &outpack[ICMP_MINLEN];
+					for (i = 0; i < datalen; ++i, ++cp) {
+						if ((i % 16) == 8)
+							(void)printf("\n\t");
+						(void)printf("%2x ", *cp);
+					}
+					break;
+				}
+			}
+		}
+	} else {
+		/*
+		 * We've got something other than an ECHOREPLY.
+		 * See if it's a reply to something that we sent.
+		 * We can compare IP destination, protocol,
+		 * and ICMP type and ID.
+		 *
+		 * Only print all the error messages if we are running
+		 * as root to avoid leaking information not normally
+		 * available to those not running as root.
+		 */
+#ifndef icmp_data
+		struct ip *oip = &icp->icmp_ip;
+#else
+		struct ip *oip = (struct ip *)icp->icmp_data;
+#endif
+		struct icmp *oicmp = (struct icmp *)(oip + 1);
+
+		if (((options_ & F_VERBOSE) && uid == 0) ||
+		    (!(options_ & F_QUIET2) &&
+		     (oip->ip_dst.s_addr == whereto.sin_addr.s_addr) &&
+		     (oip->ip_p == IPPROTO_ICMP) &&
+		     (oicmp->icmp_type == ICMP_ECHO) &&
+		     (oicmp->icmp_id == ident))) {
+		    (void)printf("%d bytes from %s: ", cc,
+			pr_addr(from->sin_addr));
+		    pr_icmph(icp);
+		} else
+		    return;
+	}
+
+	/* Display any IP options */
+	cp = (u_char *)buf + sizeof(struct ip);
+
+	for (; hlen > (int)sizeof(struct ip); --hlen, ++cp)
+		switch (*cp) {
+		case IPOPT_EOL:
+			hlen = 0;
+			break;
+		case IPOPT_LSRR:
+		case IPOPT_SSRR:
+			(void)printf(*cp == IPOPT_LSRR ?
+			    "\nLSRR: " : "\nSSRR: ");
+			j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1;
+			hlen -= 2;
+			cp += 2;
+			if (j >= INADDR_LEN &&
+			    j <= hlen - (int)sizeof(struct ip)) {
+				for (;;) {
+					bcopy(++cp, &ina.s_addr, INADDR_LEN);
+					if (ina.s_addr == 0)
+						(void)printf("\t0.0.0.0");
+					else
+						(void)printf("\t%s",
+						     pr_addr(ina));
+					hlen -= INADDR_LEN;
+					cp += INADDR_LEN - 1;
+					j -= INADDR_LEN;
+					if (j < INADDR_LEN)
+						break;
+					(void)putchar('\n');
+				}
+			} else
+				(void)printf("\t(truncated route)\n");
+			break;
+		case IPOPT_RR:
+			j = cp[IPOPT_OLEN];		/* get length */
+			i = cp[IPOPT_OFFSET];		/* and pointer */
+			hlen -= 2;
+			cp += 2;
+			if (i > j)
+				i = j;
+			i = i - IPOPT_MINOFF + 1;
+			if (i < 0 || i > (hlen - (int)sizeof(struct ip))) {
+				old_rrlen = 0;
+				continue;
+			}
+			if (i == old_rrlen
+			    && !bcmp((char *)cp, old_rr, i)
+			    && !(options_ & F_FLOOD)) {
+				(void)printf("\t(same route)");
+				hlen -= i;
+				cp += i;
+				break;
+			}
+			old_rrlen = i;
+			bcopy((char *)cp, old_rr, i);
+			(void)printf("\nRR: ");
+			if (i >= INADDR_LEN &&
+			    i <= hlen - (int)sizeof(struct ip)) {
+				for (;;) {
+					bcopy(++cp, &ina.s_addr, INADDR_LEN);
+					if (ina.s_addr == 0)
+						(void)printf("\t0.0.0.0");
+					else
+						(void)printf("\t%s",
+						     pr_addr(ina));
+					hlen -= INADDR_LEN;
+					cp += INADDR_LEN - 1;
+					i -= INADDR_LEN;
+					if (i < INADDR_LEN)
+						break;
+					(void)putchar('\n');
+				}
+			} else
+				(void)printf("\t(truncated route)");
+			break;
+		case IPOPT_NOP:
+			(void)printf("\nNOP");
+			break;
+		default:
+			(void)printf("\nunknown option %x", *cp);
+			break;
+		}
+	if (!(options_ & F_FLOOD)) {
+		(void)putchar('\n');
+		(void)fflush(stdout);
+	}
+}
+
+/*
+ * in_cksum --
+ *	Checksum routine for Internet Protocol family headers (C Version)
+ */
+u_short
+in_cksum(addr, len)
+	u_short *addr;
+	int len;
+{
+	int nleft, sum;
+	u_short *w;
+	union {
+		u_short	us;
+		u_char	uc[2];
+	} last;
+	u_short answer;
+
+	nleft = len;
+	sum = 0;
+	w = addr;
+
+	/*
+	 * Our algorithm is simple, using a 32 bit accumulator (sum), we add
+	 * sequential 16 bit words to it, and at the end, fold back all the
+	 * carry bits from the top 16 bits into the lower 16 bits.
+	 */
+	while (nleft > 1)  {
+		sum += *w++;
+		nleft -= 2;
+	}
+
+	/* mop up an odd byte, if necessary */
+	if (nleft == 1) {
+		last.uc[0] = *(u_char *)w;
+		last.uc[1] = 0;
+		sum += last.us;
+	}
+
+	/* add back carry outs from top 16 bits to low 16 bits */
+	sum = (sum >> 16) + (sum & 0xffff);	/* add hi 16 to low 16 */
+	sum += (sum >> 16);			/* add carry */
+	answer = ~sum;				/* truncate to 16 bits */
+	return(answer);
+}
+
+/*
+ * tvsub --
+ *	Subtract 2 timeval structs:  out = out - in.  Out is assumed to
+ * be >= in.
+ */
+static void
+tvsub(out, in)
+	struct timeval *out, *in;
+{
+
+	if ((out->tv_usec -= in->tv_usec) < 0) {
+		--out->tv_sec;
+		out->tv_usec += 1000000;
+	}
+	out->tv_sec -= in->tv_sec;
+}
+
+/*
+ * status --
+ *	Print out statistics when SIGINFO is received.
+ */
+
+static void
+status(sig)
+	int sig __unused;
+{
+#if !__rtems__
+	siginfo_p = 1;
+#endif
+}
+
+static void
+g_check_status(globals)
+  rtems_shell_globals_t* globals;
+{
+	if (siginfo_p) {
+		siginfo_p = 0;
+		(void)fprintf(stderr, "\r%ld/%ld packets received (%.1f%%)",
+		    nreceived, ntransmitted,
+		    ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0);
+		if (nreceived && timing)
+			(void)fprintf(stderr, " %.3f min / %.3f avg / %.3f max",
+			    tmin, tsum / (nreceived + nrepeats), tmax);
+		(void)fprintf(stderr, "\n");
+	}
+}
+
+/*
+ * finish --
+ *	Print out statistics, and give up.
+ */
+static void
+g_finish(globals)
+  rtems_shell_globals_t* globals;
+{
+
+	(void)signal(SIGINT, SIG_IGN);
+	(void)signal(SIGALRM, SIG_IGN);
+	(void)putchar('\n');
+	(void)fflush(stdout);
+	(void)printf("--- %s ping statistics ---\n", hostname);
+	(void)printf("%ld packets transmitted, ", ntransmitted);
+	(void)printf("%ld packets received, ", nreceived);
+	if (nrepeats)
+		(void)printf("+%ld duplicates, ", nrepeats);
+	if (ntransmitted) {
+		if (nreceived > ntransmitted)
+			(void)printf("-- somebody's printing up packets!");
+		else
+			(void)printf("%.1f%% packet loss",
+			    ((ntransmitted - nreceived) * 100.0) /
+			    ntransmitted);
+	}
+	if (nrcvtimeout)
+		(void)printf(", %ld packets out of wait time", nrcvtimeout);
+	(void)putchar('\n');
+	if (nreceived && timing) {
+		double n = nreceived + nrepeats;
+		double avg = tsum / n;
+		double vari = tsumsq / n - avg * avg;
+		(void)printf(
+		    "round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n",
+		    tmin, avg, tmax, sqrt(vari));
+	}
+	if (nreceived)
+		exit(0);
+	else
+		exit(2);
+  while (1);
+}
+
+#ifdef notdef
+static char *ttab[] = {
+	"Echo Reply",		/* ip + seq + udata */
+	"Dest Unreachable",	/* net, host, proto, port, frag, sr + IP */
+	"Source Quench",	/* IP */
+	"Redirect",		/* redirect type, gateway, + IP  */
+	"Echo",
+	"Time Exceeded",	/* transit, frag reassem + IP */
+	"Parameter Problem",	/* pointer + IP */
+	"Timestamp",		/* id + seq + three timestamps */
+	"Timestamp Reply",	/* " */
+	"Info Request",		/* id + sq */
+	"Info Reply"		/* " */
+};
+#endif
+
+/*
+ * pr_icmph --
+ *	Print a descriptive string about an ICMP header.
+ */
+static void
+pr_icmph(icp)
+	struct icmp *icp;
+{
+
+	switch(icp->icmp_type) {
+	case ICMP_ECHOREPLY:
+		(void)printf("Echo Reply\n");
+		/* XXX ID + Seq + Data */
+		break;
+	case ICMP_UNREACH:
+		switch(icp->icmp_code) {
+		case ICMP_UNREACH_NET:
+			(void)printf("Destination Net Unreachable\n");
+			break;
+		case ICMP_UNREACH_HOST:
+			(void)printf("Destination Host Unreachable\n");
+			break;
+		case ICMP_UNREACH_PROTOCOL:
+			(void)printf("Destination Protocol Unreachable\n");
+			break;
+		case ICMP_UNREACH_PORT:
+			(void)printf("Destination Port Unreachable\n");
+			break;
+		case ICMP_UNREACH_NEEDFRAG:
+			(void)printf("frag needed and DF set (MTU %d)\n",
+					ntohs(icp->icmp_nextmtu));
+			break;
+		case ICMP_UNREACH_SRCFAIL:
+			(void)printf("Source Route Failed\n");
+			break;
+		case ICMP_UNREACH_FILTER_PROHIB:
+			(void)printf("Communication prohibited by filter\n");
+			break;
+		default:
+			(void)printf("Dest Unreachable, Bad Code: %d\n",
+			    icp->icmp_code);
+			break;
+		}
+		/* Print returned IP header information */
+#ifndef icmp_data
+		pr_retip(&icp->icmp_ip);
+#else
+		pr_retip((struct ip *)icp->icmp_data);
+#endif
+		break;
+	case ICMP_SOURCEQUENCH:
+		(void)printf("Source Quench\n");
+#ifndef icmp_data
+		pr_retip(&icp->icmp_ip);
+#else
+		pr_retip((struct ip *)icp->icmp_data);
+#endif
+		break;
+	case ICMP_REDIRECT:
+		switch(icp->icmp_code) {
+		case ICMP_REDIRECT_NET:
+			(void)printf("Redirect Network");
+			break;
+		case ICMP_REDIRECT_HOST:
+			(void)printf("Redirect Host");
+			break;
+		case ICMP_REDIRECT_TOSNET:
+			(void)printf("Redirect Type of Service and Network");
+			break;
+		case ICMP_REDIRECT_TOSHOST:
+			(void)printf("Redirect Type of Service and Host");
+			break;
+		default:
+			(void)printf("Redirect, Bad Code: %d", icp->icmp_code);
+			break;
+		}
+		(void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr));
+#ifndef icmp_data
+		pr_retip(&icp->icmp_ip);
+#else
+		pr_retip((struct ip *)icp->icmp_data);
+#endif
+		break;
+	case ICMP_ECHO:
+		(void)printf("Echo Request\n");
+		/* XXX ID + Seq + Data */
+		break;
+	case ICMP_TIMXCEED:
+		switch(icp->icmp_code) {
+		case ICMP_TIMXCEED_INTRANS:
+			(void)printf("Time to live exceeded\n");
+			break;
+		case ICMP_TIMXCEED_REASS:
+			(void)printf("Frag reassembly time exceeded\n");
+			break;
+		default:
+			(void)printf("Time exceeded, Bad Code: %d\n",
+			    icp->icmp_code);
+			break;
+		}
+#ifndef icmp_data
+		pr_retip(&icp->icmp_ip);
+#else
+		pr_retip((struct ip *)icp->icmp_data);
+#endif
+		break;
+	case ICMP_PARAMPROB:
+		(void)printf("Parameter problem: pointer = 0x%02x\n",
+		    icp->icmp_hun.ih_pptr);
+#ifndef icmp_data
+		pr_retip(&icp->icmp_ip);
+#else
+		pr_retip((struct ip *)icp->icmp_data);
+#endif
+		break;
+	case ICMP_TSTAMP:
+		(void)printf("Timestamp\n");
+		/* XXX ID + Seq + 3 timestamps */
+		break;
+	case ICMP_TSTAMPREPLY:
+		(void)printf("Timestamp Reply\n");
+		/* XXX ID + Seq + 3 timestamps */
+		break;
+	case ICMP_IREQ:
+		(void)printf("Information Request\n");
+		/* XXX ID + Seq */
+		break;
+	case ICMP_IREQREPLY:
+		(void)printf("Information Reply\n");
+		/* XXX ID + Seq */
+		break;
+	case ICMP_MASKREQ:
+		(void)printf("Address Mask Request\n");
+		break;
+	case ICMP_MASKREPLY:
+		(void)printf("Address Mask Reply\n");
+		break;
+	case ICMP_ROUTERADVERT:
+		(void)printf("Router Advertisement\n");
+		break;
+	case ICMP_ROUTERSOLICIT:
+		(void)printf("Router Solicitation\n");
+		break;
+	default:
+		(void)printf("Bad ICMP type: %d\n", icp->icmp_type);
+	}
+}
+
+/*
+ * pr_iph --
+ *	Print an IP header with options.
+ */
+static void
+pr_iph(ip)
+	struct ip *ip;
+{
+	u_char *cp;
+	int hlen;
+
+	hlen = ip->ip_hl << 2;
+	cp = (u_char *)ip + 20;		/* point to options */
+
+	(void)printf("Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst\n");
+	(void)printf(" %1x  %1x  %02x %04x %04x",
+	    ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len),
+	    ntohs(ip->ip_id));
+	(void)printf("   %1lx %04lx",
+	    (u_long) (ntohl(ip->ip_off) & 0xe000) >> 13,
+	    (u_long) ntohl(ip->ip_off) & 0x1fff);
+	(void)printf("  %02x  %02x %04x", ip->ip_ttl, ip->ip_p,
+							    ntohs(ip->ip_sum));
+	(void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_src.s_addr));
+	(void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_dst.s_addr));
+	/* dump any option bytes */
+	while (hlen-- > 20) {
+		(void)printf("%02x", *cp++);
+	}
+	(void)putchar('\n');
+}
+
+/*
+ * pr_addr --
+ *	Return an ascii host address as a dotted quad and optionally with
+ * a hostname.
+ */
+static char *
+g_pr_addr(ina, globals)
+	struct in_addr ina;
+  rtems_shell_globals_t* globals;
+{
+	struct hostent *hp;
+	static char buf[16 + 3 + MAXHOSTNAMELEN];
+
+	if ((options_ & F_NUMERIC) ||
+	    !(hp = gethostbyaddr((char *)&ina, 4, AF_INET)))
+		return inet_ntoa(ina);
+	else
+		(void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name,
+		    inet_ntoa(ina));
+	return(buf);
+}
+
+/*
+ * pr_retip --
+ *	Dump some info on a returned (via ICMP) IP packet.
+ */
+static void
+pr_retip(ip)
+	struct ip *ip;
+{
+	u_char *cp;
+	int hlen;
+
+	pr_iph(ip);
+	hlen = ip->ip_hl << 2;
+	cp = (u_char *)ip + hlen;
+
+	if (ip->ip_p == 6)
+		(void)printf("TCP: from port %u, to port %u (decimal)\n",
+		    (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
+	else if (ip->ip_p == 17)
+		(void)printf("UDP: from port %u, to port %u (decimal)\n",
+			(*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
+}
+
+static char *
+pr_ntime (n_time timestamp)
+{
+	static char buf[10];
+	int hour, min, sec;
+
+	sec = ntohl(timestamp) / 1000;
+	hour = sec / 60 / 60;
+	min = (sec % (60 * 60)) / 60;
+	sec = (sec % (60 * 60)) % 60;
+
+	(void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec);
+
+	return (buf);
+}
+
+static void
+g_fill(bp, patp, globals)
+	char *bp, *patp;
+  rtems_shell_globals_t* globals;
+{
+	char *cp;
+	int pat[16];
+	u_int ii, jj, kk;
+
+	for (cp = patp; *cp; cp++) {
+		if (!isxdigit(*cp))
+			errx(&globals->exit_jmp, EX_USAGE,
+			    "patterns must be specified as hex digits");
+
+	}
+	ii = sscanf(patp,
+	    "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
+	    &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
+	    &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
+	    &pat[13], &pat[14], &pat[15]);
+
+	if (ii > 0)
+		for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii)
+			for (jj = 0; jj < ii; ++jj)
+				bp[jj + kk] = pat[jj];
+	if (!(options_ & F_QUIET)) {
+		(void)printf("PATTERN: 0x");
+		for (jj = 0; jj < ii; ++jj)
+			(void)printf("%02x", bp[jj] & 0xFF);
+		(void)printf("\n");
+	}
+}
+
+#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
+#define	SECOPT		" [-P policy]"
+#else
+#define	SECOPT		""
+#endif
+static void
+g_usage(globals)
+  rtems_shell_globals_t* globals;
+{
+	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
+"usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]",
+"            [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]",
+"           " SECOPT " [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]",
+"            [-W waittime] [-z tos] host",
+"       ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]",
+"            [-M mask | time] [-m ttl]" SECOPT " [-p pattern] [-S src_addr]",
+"            [-s packetsize] [-T ttl] [-t timeout] [-W waittime]",
+"            [-z tos] mcast-group");
+	exit(EX_USAGE);
+  while (1);
+}
+
+#if __rtems__
+  #include <rtems/shell.h>
+
+  rtems_shell_cmd_t rtems_shell_PING_Command = {
+    "ping",                        /* name */
+    "ping [args]",                 /* usage */
+    "network",                     /* topic */
+    rtems_shell_main_ping,         /* command */
+    NULL,                          /* alias */
+    NULL                           /* next */
+  };
+#endif
diff --git a/cpukit/libmisc/shell/shellconfig.h b/cpukit/libmisc/shell/shellconfig.h
index 2cdfcc5..988bf88 100644
--- a/cpukit/libmisc/shell/shellconfig.h
+++ b/cpukit/libmisc/shell/shellconfig.h
@@ -84,6 +84,7 @@ extern rtems_shell_cmd_t rtems_shell_MALLOC_INFO_Command;
   extern rtems_shell_cmd_t rtems_shell_IFCONFIG_Command;
   extern rtems_shell_cmd_t rtems_shell_ROUTE_Command;
   extern rtems_shell_cmd_t rtems_shell_NETSTATS_Command;
+  extern rtems_shell_cmd_t rtems_shell_PING_Command;
 #endif
 
 extern rtems_shell_cmd_t *rtems_shell_Initial_commands[];
@@ -441,6 +442,12 @@ extern rtems_shell_alias_t *rtems_shell_Initial_aliases[];
           defined(CONFIGURE_SHELL_COMMAND_NETSTATS)
         &rtems_shell_NETSTATS_Command,
       #endif
+
+      #if (defined(CONFIGURE_SHELL_COMMANDS_ALL_NETWORKING) && \
+           !defined(CONFIGURE_SHELL_NO_COMMAND_PING)) || \
+          defined(CONFIGURE_SHELL_COMMAND_PING)
+        &rtems_shell_PING_Command,
+      #endif
     #endif
 
     /* Miscanellous shell commands */
diff --git a/cpukit/libmisc/shell/sysexits.h b/cpukit/libmisc/shell/sysexits.h
new file mode 100644
index 0000000..50827f1
--- /dev/null
+++ b/cpukit/libmisc/shell/sysexits.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 1987, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)sysexits.h	8.1 (Berkeley) 6/2/93
+ *
+ * $FreeBSD: release/9.1.0/include/sysexits.h 203964 2010-02-16 19:39:50Z imp $
+ */
+
+#ifndef	_SYSEXITS_H_
+#define	_SYSEXITS_H_
+
+/*
+ *  SYSEXITS.H -- Exit status codes for system programs.
+ *
+ *	This include file attempts to categorize possible error
+ *	exit statuses for system programs, notably delivermail
+ *	and the Berkeley network.
+ *
+ *	Error numbers begin at EX__BASE to reduce the possibility of
+ *	clashing with other exit statuses that random programs may
+ *	already return.  The meaning of the codes is approximately
+ *	as follows:
+ *
+ *	EX_USAGE -- The command was used incorrectly, e.g., with
+ *		the wrong number of arguments, a bad flag, a bad
+ *		syntax in a parameter, or whatever.
+ *	EX_DATAERR -- The input data was incorrect in some way.
+ *		This should only be used for user's data & not
+ *		system files.
+ *	EX_NOINPUT -- An input file (not a system file) did not
+ *		exist or was not readable.  This could also include
+ *		errors like "No message" to a mailer (if it cared
+ *		to catch it).
+ *	EX_NOUSER -- The user specified did not exist.  This might
+ *		be used for mail addresses or remote logins.
+ *	EX_NOHOST -- The host specified did not exist.  This is used
+ *		in mail addresses or network requests.
+ *	EX_UNAVAILABLE -- A service is unavailable.  This can occur
+ *		if a support program or file does not exist.  This
+ *		can also be used as a catchall message when something
+ *		you wanted to do doesn't work, but you don't know
+ *		why.
+ *	EX_SOFTWARE -- An internal software error has been detected.
+ *		This should be limited to non-operating system related
+ *		errors as possible.
+ *	EX_OSERR -- An operating system error has been detected.
+ *		This is intended to be used for such things as "cannot
+ *		fork", "cannot create pipe", or the like.  It includes
+ *		things like getuid returning a user that does not
+ *		exist in the passwd file.
+ *	EX_OSFILE -- Some system file (e.g., /etc/passwd, /etc/utmp,
+ *		etc.) does not exist, cannot be opened, or has some
+ *		sort of error (e.g., syntax error).
+ *	EX_CANTCREAT -- A (user specified) output file cannot be
+ *		created.
+ *	EX_IOERR -- An error occurred while doing I/O on some file.
+ *	EX_TEMPFAIL -- temporary failure, indicating something that
+ *		is not really an error.  In sendmail, this means
+ *		that a mailer (e.g.) could not create a connection,
+ *		and the request should be reattempted later.
+ *	EX_PROTOCOL -- the remote system returned something that
+ *		was "not possible" during a protocol exchange.
+ *	EX_NOPERM -- You did not have sufficient permission to
+ *		perform the operation.  This is not intended for
+ *		file system problems, which should use NOINPUT or
+ *		CANTCREAT, but rather for higher level permissions.
+ */
+
+#define EX_OK		0	/* successful termination */
+
+#define EX__BASE	64	/* base value for error messages */
+
+#define EX_USAGE	64	/* command line usage error */
+#define EX_DATAERR	65	/* data format error */
+#define EX_NOINPUT	66	/* cannot open input */
+#define EX_NOUSER	67	/* addressee unknown */
+#define EX_NOHOST	68	/* host name unknown */
+#define EX_UNAVAILABLE	69	/* service unavailable */
+#define EX_SOFTWARE	70	/* internal software error */
+#define EX_OSERR	71	/* system error (e.g., can't fork) */
+#define EX_OSFILE	72	/* critical OS file missing */
+#define EX_CANTCREAT	73	/* can't create (user) output file */
+#define EX_IOERR	74	/* input/output error */
+#define EX_TEMPFAIL	75	/* temp failure; user is invited to retry */
+#define EX_PROTOCOL	76	/* remote error in protocol */
+#define EX_NOPERM	77	/* permission denied */
+#define EX_CONFIG	78	/* configuration error */
+
+#define EX__MAX	78	/* maximum listed value */
+
+#endif /* !_SYSEXITS_H_ */
diff --git a/doc/shell/network.t b/doc/shell/network.t
index ec052dd..a5bd86a 100644
--- a/doc/shell/network.t
+++ b/doc/shell/network.t
@@ -14,6 +14,7 @@ The RTEMS shell has the following network commands:
 @item @code{netstats} - obtain network statistics
 @item @code{ifconfig} - configure a network interface
 @item @code{route} - show or manipulate the IP routing table
+ at item @code{ping} - ping a host or IP address
 
 @end itemize
 
@@ -103,10 +104,10 @@ command to print the MBUF statistics:
 ************ MBUF STATISTICS ************
 mbufs:2048    clusters: 128    free:  63
 drops:   0       waits:   0  drains:   0
-      free:1967          data:79          header:2           socket:0       
-       pcb:0           rtable:0           htable:0           atable:0       
-    soname:0           soopts:0           ftable:0           rights:0       
-    ifaddr:0          control:0          oobdata:0       
+      free:1967          data:79          header:2           socket:0
+       pcb:0           rtable:0           htable:0           atable:0
+    soname:0           soopts:0           ftable:0           rights:0
+    ifaddr:0          control:0          oobdata:0
 @end smallexample
 
 The following is an example of using the @code{netstats}
@@ -117,14 +118,14 @@ command to print the print the interface statistics:
 ************ INTERFACE STATISTICS ************
 ***** eth1 *****
 Ethernet Address: 00:04:9F:00:5B:21
-Address:192.168.1.244   Broadcast Address:192.168.1.255   Net mask:255.255.255.0   
+Address:192.168.1.244   Broadcast Address:192.168.1.255   Net mask:255.255.255.0
 Flags: Up Broadcast Running Active Multicast
-Send queue limit:50   length:1    Dropped:0       
-      Rx Interrupts:889            Not First:0               Not Last:0       
-              Giant:0              Non-octet:0       
-            Bad CRC:0                Overrun:0              Collision:0       
-      Tx Interrupts:867             Deferred:0         Late Collision:0       
-   Retransmit Limit:0               Underrun:0             Misaligned:0       
+Send queue limit:50   length:1    Dropped:0
+      Rx Interrupts:889            Not First:0               Not Last:0
+              Giant:0              Non-octet:0
+            Bad CRC:0                Overrun:0              Collision:0
+      Tx Interrupts:867             Deferred:0         Late Collision:0
+   Retransmit Limit:0               Underrun:0             Misaligned:0
 @end smallexample
 
 The following is an example of using the @code{netstats}
@@ -190,7 +191,7 @@ command to print the TCP statistics:
 @findex CONFIGURE_SHELL_NO_COMMAND_NETSTATS
 @findex CONFIGURE_SHELL_COMMAND_NETSTATS
 
-This command is included in the default shell command set.  
+This command is included in the default shell command set.
 When building a custom command set, define
 @code{CONFIGURE_SHELL_COMMAND_NETSTATS} to have this
 command included.
@@ -260,14 +261,14 @@ The following is an example of how to use @code{ifconfig}:
  ************ INTERFACE STATISTICS ************
 ***** eth1 *****
 Ethernet Address: 00:04:9F:00:5B:21
-Address:192.168.1.244   Broadcast Address:192.168.1.255   Net mask:255.255.255.0   
+Address:192.168.1.244   Broadcast Address:192.168.1.255   Net mask:255.255.255.0
 Flags: Up Broadcast Running Active Multicast
-Send queue limit:50   length:1    Dropped:0       
-      Rx Interrupts:5391           Not First:0               Not Last:0       
-              Giant:0              Non-octet:0       
-            Bad CRC:0                Overrun:0              Collision:0       
-      Tx Interrupts:5256            Deferred:0         Late Collision:0       
-   Retransmit Limit:0               Underrun:0             Misaligned:0      
+Send queue limit:50   length:1    Dropped:0
+      Rx Interrupts:5391           Not First:0               Not Last:0
+              Giant:0              Non-octet:0
+            Bad CRC:0                Overrun:0              Collision:0
+      Tx Interrupts:5256            Deferred:0         Late Collision:0
+   Retransmit Limit:0               Underrun:0             Misaligned:0
 @end smallexample
 
 @subheading CONFIGURATION:
@@ -275,7 +276,7 @@ Send queue limit:50   length:1    Dropped:0
 @findex CONFIGURE_SHELL_NO_COMMAND_IFCONFIG
 @findex CONFIGURE_SHELL_COMMAND_IFCONFIG
 
-This command is included in the default shell command set.  
+This command is included in the default shell command set.
 When building a custom command set, define
 @code{CONFIGURE_SHELL_COMMAND_IFCONFIG} to have this
 command included.
@@ -381,7 +382,7 @@ default         192.168.1.14       UGS         0        0      0 eth1
 @findex CONFIGURE_SHELL_NO_COMMAND_ROUTE
 @findex CONFIGURE_SHELL_COMMAND_ROUTE
 
-This command is included in the default shell command set.  
+This command is included in the default shell command set.
 When building a custom command set, define
 @code{CONFIGURE_SHELL_COMMAND_ROUTE} to have this
 command included.
@@ -411,3 +412,271 @@ following prototype:
 extern rtems_shell_cmd_t rtems_shell_ROUTE_Command;
 @end example
 
+ at c
+ at c
+ at c
+ at page
+ at subsection ping - ping a host or IP address
+
+ at pgindex ping
+
+ at subheading SYNOPSYS:
+
+ at example
+ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]
+     [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]
+     [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]
+     [-W waittime] [-z tos] host
+ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]
+     [-M mask | time] [-m ttl] [-p pattern] [-S src_addr]
+     [-s packetsize] [-T ttl] [-t timeout] [-W waittime]
+     [-z tos] mcast-group
+ at end example
+
+ at subheading DESCRIPTION:
+
+The ping utility uses the ICMP protocol's mandatory ECHO_REQUEST
+datagram to elicit an ICMP ECHO_RESPONSE from a host or gateway.
+ECHO_REQUEST datagrams (``pings'') have an IP and ICMP header,
+followed by a ``struct timeval'' and then an arbitrary number of
+``pad'' bytes used to fill out the packet.  The options are as
+follows:
+
+ at table @b
+ at item -A
+Audible.  Output a bell (ASCII 0x07) character when no packet is
+received before the next packet is transmitted.  To cater for
+round-trip times that are longer than the interval between
+transmissions, further missing packets cause a bell only if the
+maximum number of unreceived packets has increased.
+
+ at item -a
+Audible.  Include a bell (ASCII 0x07) character in the output when any
+packet is received.  This option is ignored if other format options
+are present.
+
+ at item -c count
+Stop after sending (and receiving) count ECHO_RESPONSE packets.  If
+this option is not specified, ping will operate until interrupted.  If
+this option is specified in conjunction with ping sweeps, each sweep
+will consist of count packets.
+
+ at item -D
+Set the Don't Fragment bit.
+
+ at item -d
+Set the SO_DEBUG option on the socket being used.
+
+ at item -f
+Flood ping.  Outputs packets as fast as they come back or one
+hundred times per second, whichever is more.  For every ECHO_REQUEST
+sent a period ``.'' is printed, while for every ECHO_REPLY received a
+backspace is printed.  This provides a rapid display of how many
+packets are being dropped.  Only the super-user may use this option.
+This can be very hard on a network and should be used with caution.
+
+ at item -G sweepmaxsize
+Specify the maximum size of ICMP payload when sending sweeping pings.
+This option is required for ping sweeps.
+
+ at item -g sweepminsize
+Specify the size of ICMP payload to start with when sending sweeping
+pings.  The default value is 0.
+
+ at item -h sweepincrsize
+Specify the number of bytes to increment the size of ICMP payload
+after each sweep when sending sweeping pings.  The default value is 1.
+
+ at item -I iface
+Source multicast packets with the given interface address.  This flag
+only applies if the ping destination is a multicast address.
+
+ at item -i wait
+Wait wait seconds between sending each packet.  The default is to wait
+for one second between each packet.  The wait time may be fractional,
+but only the super-user may specify values less than 1 second.  This
+option is incompatible with the -f option.
+
+ at item -L
+Suppress loopback of multicast packets.  This flag only applies if the
+ping destination is a multicast address.
+
+ at item -l preload
+If preload is specified, ping sends that many packets as fast as
+possible before falling into its normal mode of behavior.  Only the
+super-user may use this option.
+
+ at item -M mask | time
+Use ICMP_MASKREQ or ICMP_TSTAMP instead of ICMP_ECHO.  For mask, print
+the netmask of the remote machine.  Set the net.inet.icmp.maskrepl MIB
+variable to enable ICMP_MASKREPLY.  For time, print the origination,
+reception and transmission timestamps.
+
+ at item -m ttl
+Set the IP Time To Live for outgoing packets.  If not specified, the
+kernel uses the value of the net.inet.ip.ttl MIB variable.
+
+ at item -n
+Numeric output only.  No attempt will be made to lookup symbolic names
+for host addresses.
+
+ at item -o
+Exit successfully after receiving one reply packet.
+
+ at item -p pattern
+You may specify up to 16 ``pad'' bytes to fill out the packet you
+send.  This is useful for diagnosing data-dependent problems in a
+network.  For example, ``-p ff'' will cause the sent packet to be
+filled with all ones.
+
+ at item -Q
+Somewhat quiet output.  Don't display ICMP error messages that are in
+response to our query messages.  Originally, the -v flag was required
+to display such errors, but -v displays all ICMP error messages.  On a
+busy machine, this output can be overbear- ing.  Without the -Q flag,
+ping prints out any ICMP error mes- sages caused by its own
+ECHO_REQUEST messages.
+
+ at item -q
+Quiet output.  Nothing is displayed except the summary lines at
+startup time and when finished.
+
+ at item -R
+Record route.  Includes the RECORD_ROUTE option in the ECHO_REQUEST
+packet and displays the route buffer on returned packets.  Note that
+the IP header is only large enough for nine such routes; the
+traceroute(8) command is usually better at determining the route
+packets take to a particular destination.  If more routes come back
+than should, such as due to an illegal spoofed packet, ping will print
+the route list and then truncate it at the correct spot.  Many hosts
+ignore or discard the RECORD_ROUTE option.
+
+ at item -r
+Bypass the normal routing tables and send directly to a host on an
+attached network.  If the host is not on a directly-attached network,
+an error is returned.  This option can be used to ping a local host
+through an interface that has no route through it (e.g., after the
+interface was dropped).
+
+ at item -S src_addr
+Use the following IP address as the source address in outgoing
+packets.  On hosts with more than one IP address, this option can be
+used to force the source address to be something other than the IP
+address of the interface the probe packet is sent on.  If the IP
+address is not one of this machine's interface addresses, an error is
+returned and nothing is sent.
+
+ at item -s packetsize
+Specify the number of data bytes to be sent.  The default is 56, which
+translates into 64 ICMP data bytes when combined with the 8 bytes of
+ICMP header data.  Only the super-user may specify val- ues more than
+default.  This option cannot be used with ping sweeps.
+
+ at item -T ttl
+Set the IP Time To Live for multicasted packets.  This flag only
+applies if the ping destination is a multicast address.
+
+ at item -t timeout
+Specify a timeout, in seconds, before ping exits regardless of how
+many packets have been received.
+
+ at item -v
+Verbose output.  ICMP packets other than ECHO_RESPONSE that are
+received are listed.
+
+ at item -W waittime
+Time in milliseconds to wait for a reply for each packet sent.  If a
+reply arrives later, the packet is not printed as replied, but
+considered as replied when calculating statistics.
+
+ at item -z tos
+Use the specified type of service.
+
+ at subheading EXIT STATUS:
+The ping utility exits with one of the following values:
+
+0    At least one response was heard from the specified host.
+
+2    The transmission was successful but no responses were
+     received.
+
+any other value an error occurred.  These values are defined in
+<sysexits.h>.
+
+ at subheading NOTES:
+
+When using ping for fault isolation, it should first be run on the
+local host, to verify that the local network interface is up and
+running.  Then, hosts and gateways further and further away should be
+``pinged''.  Round-trip times and packet loss statistics are computed.
+If duplicate packets are received, they are not included in the packet
+loss calculation, although the round trip time of these packets is
+used in calculating the round-trip time statistics.  When the
+specified number of packets have been sent a brief summary is
+displayed, showing the number of packets sent and received, and the
+minimum, mean, maximum, and standard deviation of the round-trip
+times.
+
+This program is intended for use in network testing, measurement and
+management.  Because of the load it can impose on the network, it is
+unwise to use ping during normal operations or from automated scripts.
+
+ at subheading EXAMPLES:
+
+The following is an example of how to use @code{oing} to ping:
+
+ at smallexample
+[/] # ping 10.10.10.1
+PING 10.10.10.1 (10.10.10.1): 56 data bytes
+64 bytes from 10.10.10.1: icmp_seq=0 ttl=63 time=0.356 ms
+64 bytes from 10.10.10.1: icmp_seq=1 ttl=63 time=0.229 ms
+64 bytes from 10.10.10.1: icmp_seq=2 ttl=63 time=0.233 ms
+64 bytes from 10.10.10.1: icmp_seq=3 ttl=63 time=0.235 ms
+64 bytes from 10.10.10.1: icmp_seq=4 ttl=63 time=0.229 ms
+
+--- 10.10.10.1 ping statistics ---
+5 packets transmitted, 5 packets received, 0.0% packet loss
+round-trip min/avg/max/stddev = 0.229/0.256/0.356/0.050 ms
+[/] # ping -f -c 10000  10.10.10.1
+PING 10.10.10.1 (10.10.10.1): 56 data bytes
+.
+--- 10.10.10.1 ping statistics ---
+10000 packets transmitted, 10000 packets received, 0.0% packet loss
+round-trip min/avg/max/stddev = 0.154/0.225/0.533/0.027 ms
+ at end smallexample
+
+ at subheading CONFIGURATION:
+
+ at findex CONFIGURE_SHELL_NO_COMMAND_PING
+ at findex CONFIGURE_SHELL_COMMAND_PING
+
+This command is included in the default shell command set.
+When building a custom command set, define
+ at code{CONFIGURE_SHELL_COMMAND_PING} to have this
+command included.
+
+This command can be excluded from the shell command set by
+defining @code{CONFIGURE_SHELL_NO_COMMAND_PING} when all
+shell commands have been configured.
+
+ at subheading PROGRAMMING INFORMATION:
+
+ at findex rtems_shell_rtems_main_ping
+
+The @code{ping} is implemented by a C language function
+which has the following prototype:
+
+ at example
+int rtems_shell_rtems_main_ping(
+  int    argc,
+  char **argv
+);
+ at end example
+
+The configuration structure for the @code{ping} has the
+following prototype:
+
+ at example
+extern rtems_shell_cmd_t rtems_shell_PING_Command;
+ at end example
+



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