xref: /freebsd/contrib/mandoc/test-cmsg.c (revision 55141f2c8991b2a6adbf30bb0fe3e6cbc303f06d)
1 #include <stddef.h>
2 #include <sys/socket.h>
3 
4 int
5 main(void)
6 {
7 	struct msghdr	 msg;
8 
9 	msg.msg_control = NULL;
10 	msg.msg_controllen = 0;
11 
12 	return CMSG_FIRSTHDR(&msg) != NULL;
13 }
14