/* Test poll bits 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"); struct pollfd pfd; memset(&pfd, 0, sizeof(pfd)); pfd.fd = fd; pfd.events = POLLIN | POLLOUT; int num_events = poll(&pfd, 1, 0); if ( num_events < 0 ) err(1, "poll"); if ( num_events == 0 ) errx(1, "poll returned 0"); printf("0"); if ( pfd.revents & POLLIN ) printf(" | POLLIN"); if ( pfd.revents & POLLPRI ) printf(" | POLLPRI"); if ( pfd.revents & POLLOUT ) printf(" | POLLOUT"); #if defined(POLLRDHUP) && POLLRDHUP != POLLHUP if ( pfd.revents & POLLRDHUP ) printf(" | POLLRDHUP"); #endif if ( pfd.revents & POLLERR ) printf(" | POLLERR"); if ( pfd.revents & POLLHUP ) printf(" | POLLHUP"); #if POLLRDNORM != POLLIN if ( pfd.revents & POLLRDNORM ) printf(" | POLLRDNORM"); #endif #if POLLRDBAND != POLLPRI if ( pfd.revents & POLLRDBAND ) printf(" | POLLRDBAND"); #endif #if POLLWRNORM != POLLOUT if ( pfd.revents & POLLWRNORM ) printf(" | POLLWRNORM"); #endif #if POLLWRBAND != POLLOUT if ( pfd.revents & POLLWRBAND ) printf(" | POLLWRBAND"); #endif putchar('\n'); return 0; }