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tools/testing/selftests/kcmp/kcmp_test.c: print reason for failure in kcmp_test

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I was curious why sys_kcmp wasn't working, which led me to the testcase.
It turned out I hadn't enabled CHECKPOINT_RESTORE in the kernel I was
testing.  Add a decoding of errno to the testcase to make that obvious.

Signed-off-by: Dave Jones <davej@redhat.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Jones 2012-12-17 16:04:52 -08:00 committed by Linus Torvalds
parent 5a55f8bb2d
commit 2bf1cbf1c6
1 changed files with 4 additions and 2 deletions
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6
tools/testing/selftests/kcmp/kcmp_test.c
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@ -72,7 +72,8 @@ int main(int argc, char **argv)
/* This one should return same fd */
ret = sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd1);
if (ret) {
printf("FAIL: 0 expected but %d returned\n", ret);
printf("FAIL: 0 expected but %d returned (%s)\n",
ret, strerror(errno));
ret = -1;
} else
printf("PASS: 0 returned as expected\n");
@ -80,7 +81,8 @@ int main(int argc, char **argv)
/* Compare with self */
ret = sys_kcmp(pid1, pid1, KCMP_VM, 0, 0);
if (ret) {
printf("FAIL: 0 expected but %li returned\n", ret);
printf("FAIL: 0 expected but %li returned (%s)\n",
ret, strerror(errno));
ret = -1;
} else
printf("PASS: 0 returned as expected\n");