共计 1746 个字符，预计需要花费 5 分钟才能阅读完成。
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 <cstdio>
#include <cstdlib>
#include <cstring>
#include <unistd.h>
#include <csignal>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <sys/socket.h>
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 <port>\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;
}
项目代码
github
参考
《TCP/IP 网络编程》
