在服务器多进程版本的基础上，使用管道来向一个子进程发送接收到的数据，该子进程将接收到的数据保存到文件中。客户端代码不变。
服务器代码
#include#include #include #include #include #include #include #include const int BUF_SIZE = 30;void error_handling(const char *messgae);void read_childproc(int sig);// 接收一个参数，argv[1]为端口号int main(int argc, char *argcv[]) { int server_sock, client_sock; struct sockaddr_in server_addr, client_addr; int fds[2]; // 管道描述符 pid_t pid; struct sigaction act; socklen_t addr_size; int str_len, state; char buf[BUF_SIZE]; if (argc != 2) { printf("Usgae : %s \n", argcv[0]); exit(1); } act.sa_handler = read_childproc; sigemptyset(&act.sa_mask); act.sa_flags = 0; state = sigaction(SIGCHLD, &act, 0); server_sock = socket(PF_INET, SOCK_STREAM, 0); memset(&server_addr, 0, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = htonl(INADDR_ANY); server_addr.sin_port = htons(atoi(argcv[1])); if (bind(server_sock, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1) { error_handling("bind() error"); } if (listen(server_sock, 5) == -1) { error_handling("listen() error"); } pipe(fds); pid = fork(); if (pid == 0) { // 负责保存数据到文件的子进程 FILE *fp = fopen("echomsg.txt", "wt"); char msgbuf[BUF_SIZE]; int len; for (int i = 0; i < 10; ++i) { len = read(fds[0], msgbuf, BUF_SIZE); fwrite((void*)msgbuf, 1, len, fp); } fclose(fp); return 0; } while (1) { addr_size = sizeof(client_addr); client_sock =accept(server_sock, (struct sockaddr*)&server_addr, &addr_size); if (client_sock == -1) { continue; } else { puts("new client connected..."); } pid = fork(); if (pid == 0) { close(server_sock); while ((str_len = read(client_sock, buf, BUF_SIZE)) != 0) { write(client_sock, buf, str_len); write(fds[1], buf, str_len); // 发送数据给负责保存文件的子进程 } close(client_sock); puts("client disconnected..."); return 0; } else { close(client_sock); } } close(server_sock); return 0;}