strace.c: check return code of never failing fcntl call

Because the kernel cannot be trusted.

* strace.c (set_cloexec_flag): Call perror_msg_and_die if fcntl(F_SETFD)
has failed.

diff --git a/strace.c b/strace.c
index 4f41a25960f320fcf0fb96fb55e133db8feec6b9..3ea889f45095e83c482e4334bff86d9e34e18528 100644 (file)
--- a/strace.c
+++ b/strace.c
@@ -421,7 +421,8 @@ set_cloexec_flag(int fd)
        if (flags == newflags)
                return;
 
-       fcntl(fd, F_SETFD, newflags); /* never fails */
+       if (fcntl(fd, F_SETFD, newflags)) /* never fails */
+               perror_msg_and_die("fcntl(%d, F_SETFD, %#x)", fd, newflags);
 }
 
 static void