[PATCH] sync.c: Add asserts to document and check assumptions

[Joel Sherrill]

---
 cpukit/libcsupport/src/sync.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/cpukit/libcsupport/src/sync.c b/cpukit/libcsupport/src/sync.c
index 653a177..e449cab 100644
--- a/cpukit/libcsupport/src/sync.c
+++ b/cpukit/libcsupport/src/sync.c
@@ -29,6 +29,7 @@ int fdatasync(int);        /* still not always prototyped */
 #include <stdio.h>
 
 #include <rtems.h>
+#include <rtems/score/assert.h>
 
 /* XXX check standards -- Linux version appears to be void */
 void _fwalk(struct _reent *, void *);
@@ -37,14 +38,20 @@ void _fwalk(struct _reent *, void *);
 static void sync_wrapper(FILE *f)
 {
   int fn = fileno(f);
+  int rc;
 
   /*
    *  We are explicitly NOT checking the return values as it does not
    *  matter if they succeed.  We are just making a best faith attempt
    *  at both and trusting that we were passed a good FILE pointer.
    */
-  fsync(fn);
-  fdatasync(fn);
+  _Assert( fn != -1 );
+
+  rc = fsync(fn);
+  _Assert( rc == 0 );
+
+  rc = fdatasync(fn);
+  _Assert( rc == 0 );
 }
 
 /* iterate over all FILE *'s for this thread */
-- 
1.9.3