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Fix gcc fortify source warnings

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Resolve issues uncovered by -D_FORTIFY_SOURCE=2, the default redhat
macro's file adds this option to the cflags.  This causes warnings
of the following type designed to keep the developer honest:

        warning: ignoring return value of 'foo', declared
                 with attribute warn_unused_result

The short term fix is to wrap these calls in VERIFY() to check the
return code.  The code was already assusing these would never fail.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2010-08-26 09:52:40 -07:00
parent f709a82dc1
commit 0e5b68e015
3 changed files with 7 additions and 6 deletions
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6
cmd/zdb/zdb.c
View File

@ -1668,7 +1668,7 @@ dump_uberblock(uberblock_t *ub, const char *header, const char *footer)
{
time_t timestamp = ub->ub_timestamp;
(void) printf(header ? header : "");
(void) printf("%s", header ? header : "");
(void) printf("\tmagic = %016llx\n", (u_longlong_t)ub->ub_magic);
(void) printf("\tversion = %llu\n", (u_longlong_t)ub->ub_version);
(void) printf("\ttxg = %llu\n", (u_longlong_t)ub->ub_txg);
@ -1680,7 +1680,7 @@ dump_uberblock(uberblock_t *ub, const char *header, const char *footer)
sprintf_blkptr(blkbuf, &ub->ub_rootbp);
(void) printf("\trootbp = %s\n", blkbuf);
}
(void) printf(footer ? footer : "");
(void) printf("%s", footer ? footer : "");
}
static void
@ -2554,7 +2554,7 @@ zdb_dump_block_raw(void *buf, uint64_t size, int flags)
{
if (flags & ZDB_FLAG_BSWAP)
byteswap_uint64_array(buf, size);
(void) write(1, buf, size);
VERIFY(write(fileno(stdout), buf, size) == size);
}
static void

5
cmd/ztest/ztest.c
View File

@ -2592,7 +2592,7 @@ grow_vdev(vdev_t *vd, void *arg)
return (vd);
fsize = lseek(fd, 0, SEEK_END);
(void) ftruncate(fd, *newsize);
VERIFY(ftruncate(fd, *newsize) == 0);
if (zopt_verbose >= 6) {
(void) printf("%s grew from %lu to %lu bytes\n",
@ -5459,7 +5459,8 @@ main(int argc, char **argv)
process_options(argc, argv);
/* Override location of zpool.cache */
(void) asprintf((char **)&spa_config_path, "%s/zpool.cache", zopt_dir);
VERIFY(asprintf((char **)&spa_config_path, "%s/zpool.cache",
zopt_dir) != -1);
/*
* Blow away any existing copy of zpool.cache

2
lib/libzpool/kernel.c
View File

@ -796,7 +796,7 @@ umem_out_of_memory(void)
{
char errmsg[] = "out of memory -- generating core dump\n";
write(fileno(stderr), errmsg, sizeof (errmsg));
(void) fprintf(stderr, "%s", errmsg);
abort();
return (0);
}