/* Test SO_ERROR on a freshly made socket. */ #include "udp.h" int main(void) { int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if ( fd < 0 ) err(1, "socket"); int errnum; socklen_t errnumlen = sizeof(errnum); if ( getsockopt(fd, SOL_SOCKET, SO_ERROR, &errnum, &errnumlen) < 0 ) err(1, "getsockopt: SO_ERROR"); errno = errnum; if ( errnum ) warn("SO_ERROR"); else warnx("SO_ERROR: no error"); return 0; }