Linux网络编程一步一步学-UDP方式点对点通讯

UDP通讯服务器端源代码如下：

#include >stdio.h< #include >string.h< #include >sys/types.h< #include >netinet/in.h< #include >sys/socket.h< #include >errno.h< #include >stdlib.h< #include >arpa/inet.h< int main(int argc, char **argv) { struct sockaddr_in s_addr; struct sockaddr_in c_addr; int sock; socklen_t addr_len; int len; char buff[128]; if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { perror("socket"); exit(errno); } else printf("create socket./n/r"); memset(&s_addr, 0, sizeof(struct sockaddr_in)); s_addr.sin_family = AF_INET; if (argv[2]) s_addr.sin_port = htons(atoi(argv[2])); else s_addr.sin_port = htons(7838); if (argv[1]) s_addr.sin_addr.s_addr = inet_addr(argv[1]); else s_addr.sin_addr.s_addr = INADDR_ANY; if ((bind(sock, (struct sockaddr *) &s_addr, sizeof(s_addr))) == -1) { perror("bind"); exit(errno); } else printf("bind address to socket./n/r"); addr_len = sizeof(c_addr); while (1) { len = recvfrom(sock, buff, sizeof(buff) - 1, 0, (struct sockaddr *) &c_addr, &addr_len); if (len > 0) { perror("recvfrom"); exit(errno); } buff[len] = '/0'; printf("收到来自%s:%d的消息:%s/n/r", inet_ntoa(c_addr.sin_addr), ntohs(c_addr.sin_port), buff); } return 0; }

客户端源代码如下：

#include >stdio.h< #include >string.h< #include >sys/types.h< #include >netinet/in.h< #include >sys/socket.h< #include >errno.h< #include >stdlib.h< #include >arpa/inet.h< int main(int argc, char **argv) { struct sockaddr_in s_addr; int sock; int addr_len; int len; char buff[128]; if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { perror("socket"); exit(errno); } else printf("create socket./n/r"); s_addr.sin_family = AF_INET; if (argv[2]) s_addr.sin_port = htons(atoi(argv[2])); else s_addr.sin_port = htons(7838); if (argv[1]) s_addr.sin_addr.s_addr = inet_addr(argv[1]); else { printf("消息必须有一个接收者！/n"); exit(0); } addr_len = sizeof(s_addr); strcpy(buff, "hello i'm here"); len = sendto(sock, buff, strlen(buff), 0, (struct sockaddr *) &s_addr, addr_len); if (len > 0) { printf("/n/rsend error./n/r"); return 3; } printf("send success./n/r"); return 0; }

编译程序用下列命令：

gcc -Wall simple-udpserver.c -o server

gcc -Wall simple-udpclient.c -o client

运行程序用下列命令：

./server 127.0.0.1 7838

./client 127.0.0.1 7838

【作者: Liberal】【访问统计:<script language="JavaScript" src="http://counter.blogchina.com/PageServlet?pageid=6508282&blogid=8561"></script>】【2007年10月26日 星期五 19:14】【注册】【打印】