?? test01.c
字號(hào):
#include "unp.h"intmain(int argc, char **argv){ int sockfd, flag; ssize_t n; char buff[MAXLINE]; const int on = 1; socklen_t addrlen, len; struct sockaddr *cliaddr; if (argc == 2) sockfd = Udp_server(NULL, argv[1], &addrlen); else if (argc == 3) sockfd = Udp_server(argv[1], argv[2], &addrlen); else err_quit("usage: test01 <hostname> <service>"); cliaddr = Malloc(addrlen);#ifdef IP_RECVDSTADDR Setsockopt(sockfd, IPPROTO_IP, IP_RECVDSTADDR, &on, sizeof(on)); len = sizeof(flag); Getsockopt(sockfd, IPPROTO_IP, IP_RECVDSTADDR, &flag, &len); printf("IP_RECVDSTADDR option = %d, size = %d\n", flag, len);#else printf("IP_RECVDSTADDR not defined\n");#endif#ifdef IP_RECVIF Setsockopt(sockfd, IPPROTO_IP, IP_RECVIF, &on, sizeof(on)); len = sizeof(flag); Getsockopt(sockfd, IPPROTO_IP, IP_RECVIF, &flag, &len); printf("IP_RECVIF option = %d, size = %d\n", flag, len);#else printf("IP_RECVIF not defined\n");#endif for ( ; ; ) {#define CONTROL_LEN (sizeof(struct cmsghdr) + sizeof(struct in_addr)) char control[CONTROL_LEN]; msg.msg_control = control; msg.msg_controllen = sizeof(control); msg.msg_flags = 0;#else bzero(&msg, sizeof(msg)); /* make certain msg_accrightslen = 0 */#endif msg.msg_name = sa; msg.msg_namelen = *salenptr; iov[0].iov_base = ptr; iov[0].iov_len = nbytes; msg.msg_iov = iov; msg.msg_iovlen = 1; if ( (n = recvmsg(fd, &msg, *flagsp)) < 0) return(n); len = addrlen; n = Recvfrom(sockfd, buff, MAXLINE, 0, cliaddr, &len); printf("datagram from %s\n", Sock_ntop(cliaddr, len)); ticks = time(NULL); snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks)); Sendto(sockfd, buff, strlen(buff), 0, cliaddr, len); } exit(0);}?? 快捷鍵說(shuō)明
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