src/t_ofd_locks.c: Reset errno to zero

It seems I met libcap errno bug again when using libcap-2.48-4.el8.x86_64.
But this time, errno is EINVAL if c program link with lcap.
Lastest upstream libcap doesn't have bug and it should be backport bug.

generic/478 will become not run because of this. To fix this that only
exists on some distributions, reset errno to zero.

Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>

diff --git a/src/t_ofd_locks.c b/src/t_ofd_locks.c
index e3b15ddc6ee871aeaf972a59c0d0b69b9f54c2f0..e77f2659b6bd8b58e2cf96ff423cab06725a227a 100644 (file)
--- a/src/t_ofd_locks.c
+++ b/src/t_ofd_locks.c
@@ -187,6 +187,8 @@ int main(int argc, char **argv)
        struct sembuf sop;
        int opt, ret, retry;
 
+       //avoid libcap errno bug
+       errno = 0;
        while((opt = getopt(argc, argv, "sgrwo:l:PRWtFd")) != -1) {
                switch(opt) {
                case 's':