[PATCH v1 1/5] libcsupport: Added futimens() and utimensat()
Sebastian Huber
sebastian.huber at embedded-brains.de
Tue May 4 05:03:36 UTC 2021
On 03/05/2021 15:40, Ryan Long wrote:
> Created futimens.c and utimensat.c to add support for the POSIX
> methods futimens() and utimensat().
>
> utime() and utimes() are considered obsolote by POSIX, but RTEMS
> will continue to support them.
>
> Closes #4396
> ---
> cpukit/Makefile.am | 2 +
> cpukit/include/rtems/libio_.h | 61 +++++++++-
> cpukit/libcsupport/src/futimens.c | 91 +++++++++++++++
> cpukit/libcsupport/src/utimensat.c | 229 +++++++++++++++++++++++++++++++++++++
> spec/build/cpukit/librtemscpu.yml | 2 +
> 5 files changed, 384 insertions(+), 1 deletion(-)
> create mode 100644 cpukit/libcsupport/src/futimens.c
> create mode 100644 cpukit/libcsupport/src/utimensat.c
>
> diff --git a/cpukit/Makefile.am b/cpukit/Makefile.am
> index b0df610..29b4207 100644
> --- a/cpukit/Makefile.am
> +++ b/cpukit/Makefile.am
> @@ -262,6 +262,8 @@ librtemscpu_a_SOURCES += libcsupport/src/unmount.c
> librtemscpu_a_SOURCES += libcsupport/src/__usrenv.c
> librtemscpu_a_SOURCES += libcsupport/src/utime.c
> librtemscpu_a_SOURCES += libcsupport/src/utimes.c
> +librtemscpu_a_SOURCES += libcsupport/src/futimens.c
> +librtemscpu_a_SOURCES += libcsupport/src/utimensat.c
> librtemscpu_a_SOURCES += libcsupport/src/utsname.c
> librtemscpu_a_SOURCES += libcsupport/src/vprintk.c
> librtemscpu_a_SOURCES += libcsupport/src/write.c
> diff --git a/cpukit/include/rtems/libio_.h b/cpukit/include/rtems/libio_.h
> index e9eb462..fc7a1e4 100644
> --- a/cpukit/include/rtems/libio_.h
> +++ b/cpukit/include/rtems/libio_.h
> @@ -7,7 +7,7 @@
> */
>
> /*
> - * COPYRIGHT (c) 1989-2011.
> + * COPYRIGHT (c) 1989-2011, 2021.
> * On-Line Applications Research Corporation (OAR).
> *
> * Modifications to support reference counting in the file system are
> @@ -357,6 +357,65 @@ static inline void rtems_filesystem_instance_unlock(
> (*mt_entry->ops->unlock_h)( mt_entry );
> }
>
> +/* Prototypes for functions used between utimensat() and futimens() */
> +
> +/**
> + * @brief Checks the tv_sec member of a timespec struct
> + *
> + * @param[in] time The timespec struct to be validated
> + *
> + * Ensures that the value in the tv_sec member is non-negative.
> + *
> + * @retval true If the tv_sec member is a valid value
> + * @retval false If the tv_sec member is not a valid value
> + */
> +bool rtems_filesystem_utime_tv_sec_valid( struct timespec time );
> +
> +/**
> + * @brief Checks the tv_nsec member of a timespec struct
> + *
> + * Ensures that the value in the tv_nsec member is equal to either
> + * UTIME_NOW, UTIME_OMIT, or a value greater-than or equal to zero
> + * and less than a billion.
> + *
> + * @param[in] time The timespec struct to be validated
> + *
> + * @retval true If the tv_nsec member is a valid value
> + * @retval false If the tv_nsec member is not a valid value
> + */
> +bool rtems_filesystem_utime_tv_nsec_valid( struct timespec time );
Are these two functions ever used individually? Do they modify the time?
Maybe we should add a standard phase for boolean type returns:
@return Returns true, if the X is valid, otherwise false.
> +
> +/**
> + * @brief Determines if the process has write permissions to a file
> + *
> + * Checks that the process has the same userID as the file and whether the
> + * file has write permissions.
> + *
> + * @param[in] currentloc The current location to a file
> + * @param[in] fstat_h The file handler of @currentloc
Why is this an extra parameter?
> + *
> + * @retval 0 If the process has write permissions
> + * @retval -1 If the process does not have write permissions
Why 0 and -1, what about errno? Is it set by the function or not?
> + */
> +int rtems_filesystem_utime_check_permissions(
> + const rtems_filesystem_location_info_t *currentloc,
> + rtems_filesystem_fstat_t fstat_h
> +);
> +
> +/**
> + * @brief Checks @times and updates @new_times
> + *
> + * @param[in] times The timespec struct to be checked
> + * @param[in,out] new_times The timespec struct to contain the updated time
> + *
> + * @retval 0 If the time was able to be updated
> + * @retval -1 If the time was not able to be updated
> + */
> +int rtems_filesystem_utime_check_times(
> + const struct timespec times[2],
> + struct timespec new_times[2]
> +);
> +
> /*
> * File Descriptor Routine Prototypes
> */
> diff --git a/cpukit/libcsupport/src/futimens.c b/cpukit/libcsupport/src/futimens.c
> new file mode 100644
> index 0000000..33ae469
> --- /dev/null
> +++ b/cpukit/libcsupport/src/futimens.c
> @@ -0,0 +1,91 @@
> +/* SPDX-License-Identifier: BSD-2-Clause */
> +
> +/**
> + * @file
> + *
> + * @ingroup libcsupport
> + *
> + * @brief Set file access and modification times based on file descriptor in
> + * nanoseconds.
> + */
> +
> +/*
> + * COPYRIGHT (c) 1989-2009, 2021.
> + * On-Line Applications Research Corporation (OAR).
> + *
> + * 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.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
> + */
> +
> +#ifdef HAVE_CONFIG_H
> +#include "config.h"
> +#endif
> +
> +#include <sys/stat.h>
> +#include <rtems/libio_.h>
> +
> +#include <fcntl.h>
> +#include <stdlib.h>
> +#include <string.h>
> +
> +/**
> + * https://pubs.opengroup.org/onlinepubs/9699919799.2008edition/functions/futimens.html
> + *
> + * Set file access and modification times
> + */
> +int futimens(
> + int fd,
> + const struct timespec times[2]
> +)
> +{
> + int rv;
> + rtems_libio_t *iop;
> + struct timespec new_times[2];
> + const rtems_filesystem_location_info_t *currentloc = NULL;
> +
> + LIBIO_GET_IOP_WITH_ACCESS( fd, iop, LIBIO_FLAGS_READ, EBADF );
> +
> + currentloc = &iop->pathinfo;
> +
> + rv = rtems_filesystem_utime_check_permissions(
> + currentloc,
> + (*currentloc->handlers->fstat_h)
> + );
> + if( rv == -1 ) {
Which coding style should this file and the other new files have?
[...]
> +}
> +
> +/* Determine whether the access and modified timestamps can be updated */
> +int rtems_filesystem_utime_check_permissions(
> + const rtems_filesystem_location_info_t * currentloc,
> + rtems_filesystem_fstat_t fstat_h
> +)
> +{
> + struct stat st;
> + volatile int rv;
volatile?
> + bool write_access;
> +
> + memset( &st, 0, sizeof(st) );
> +
> + rv = (*fstat_h)( currentloc, &st );
> + if( rv != 0 ) {
> + rtems_set_errno_and_return_minus_one( ENOENT );
> + }
> +
> + /*
> + * Check that the user ID and the user ID of the file match
> + */
> + if( geteuid() != st.st_uid ) {
> + rtems_set_errno_and_return_minus_one( EACCES );
> + }
Is this really what POSIX specified?
> +
> + write_access = rtems_filesystem_check_access(
> + RTEMS_FS_PERMS_WRITE,
> + st.st_mode,
> + st.st_uid,
> + st.st_gid
> + );
> + if( !write_access ) {
> + rtems_set_errno_and_return_minus_one( EACCES );
> + }
> +
> + return 0;
> +}
> [...]
> +
> +
> +/**
> + * https://pubs.opengroup.org/onlinepubs/9699919799.2008edition/functions/futimens.html
> + *
> + * Set file access and modification times
> + */
> +int utimensat(
> + int fd,
> + const char *path,
> + const struct timespec times[2],
> + int flag
> +)
> +{
> + int rv = 0;
> + rtems_filesystem_eval_path_context_t ctx;
> + int eval_flags = RTEMS_FS_FOLLOW_LINK;
> + const rtems_filesystem_location_info_t *currentloc = NULL;
> + struct timespec new_times[2];
> +
> + /*
> + * RTEMS does not currently support operating on a real file descriptor
> + */
> + if( fd != AT_FDCWD ) {
> + rtems_set_errno_and_return_minus_one( ENOSYS );
> + }
> +
> + /*
> + * RTEMS does not currently support AT_SYMLINK_NOFOLLOW
> + */
> + if( flag != 0 ) {
> + rtems_set_errno_and_return_minus_one( ENOSYS );
> + }
> +
> + currentloc = rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
> +
> + rv = rtems_filesystem_utime_check_permissions(
> + currentloc,
> + (*currentloc->handlers->fstat_h)
> + );
> + if( rv == -1 ) {
Better use the success code, for example rv != 0.
> + rtems_filesystem_eval_path_cleanup( &ctx );
> + return rv;
> + }
> +
> + rv = rtems_filesystem_utime_check_times( times, new_times);
> + if( rv == -1 ) {
> + rtems_filesystem_eval_path_cleanup( &ctx );
> + return rv;
> + }
> +
> + rv = (*currentloc->mt_entry->ops->utimens_h)(
> + currentloc,
> + new_times
> + );
> +
> + rtems_filesystem_eval_path_cleanup( &ctx );
> +
> + return rv;
> +}
> diff --git a/spec/build/cpukit/librtemscpu.yml b/spec/build/cpukit/librtemscpu.yml
> index a3a9ee4..9639051 100644
> --- a/spec/build/cpukit/librtemscpu.yml
> +++ b/spec/build/cpukit/librtemscpu.yml
> @@ -761,6 +761,8 @@ source:
> - cpukit/libcsupport/src/unmount.c
> - cpukit/libcsupport/src/utime.c
> - cpukit/libcsupport/src/utimes.c
> +- cpukit/libcsupport/src/futimens.c
> +- cpukit/libcsupport/src/utimensat.c
> - cpukit/libcsupport/src/utsname.c
> - cpukit/libcsupport/src/vprintk.c
> - cpukit/libcsupport/src/write.c
--
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