/* Shut down for reading and writing and then test receiving a datagram. */ #include "udp.h" int main(void) { int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if ( fd < 0 ) err(1, "socket"); if ( shutdown(fd, SHUT_RDWR) ) err(1, "shutdown"); char x; ssize_t amount = recv(fd, &x, sizeof(x), MSG_DONTWAIT); if ( amount < 0 ) err(1, "recv"); else if ( amount == 0 ) puts("EOF"); return 0; }