mirror of
https://github.com/riba2534/TCP-IP-NetworkNote.git
synced 2026-02-03 01:53:19 +08:00
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <unistd.h>
|
||
#include <signal.h>
|
||
#include <sys/wait.h>
|
||
#include <arpa/inet.h>
|
||
#include <sys/socket.h>
|
||
|
||
#define BUF_SIZE 30
|
||
void error_handling(char *message);
|
||
void read_childproc(int sig);
|
||
|
||
int main(int argc, char *argv[])
|
||
{
|
||
int serv_sock, clnt_sock;
|
||
struct sockaddr_in serv_adr, clnt_adr;
|
||
|
||
pid_t pid;
|
||
struct sigaction act;
|
||
socklen_t adr_sz;
|
||
int str_len, state;
|
||
char buf[BUF_SIZE];
|
||
if (argc != 2)
|
||
{
|
||
printf("Usgae : %s <port>\n", argv[0]);
|
||
exit(1);
|
||
}
|
||
act.sa_handler = read_childproc; //防止僵尸进程
|
||
sigemptyset(&act.sa_mask);
|
||
act.sa_flags = 0;
|
||
state = sigaction(SIGCHLD, &act, 0); //注册信号处理器,把成功的返回值给 state
|
||
serv_sock = socket(PF_INET, SOCK_STREAM, 0); //创建服务端套接字
|
||
|
||
memset(&serv_adr, 0, sizeof(serv_adr));
|
||
serv_adr.sin_family = AF_INET;
|
||
serv_adr.sin_addr.s_addr = htonl(INADDR_ANY);
|
||
serv_adr.sin_port = htons(atoi(argv[1]));
|
||
|
||
if (bind(serv_sock, (struct sockaddr *)&serv_adr, sizeof(serv_adr)) == -1) //分配IP地址和端口号
|
||
error_handling("bind() error");
|
||
if (listen(serv_sock, 5) == -1) //进入等待连接请求状态
|
||
error_handling("listen() error");
|
||
while (1)
|
||
{
|
||
adr_sz = sizeof(clnt_adr);
|
||
clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_adr, &adr_sz);
|
||
printf("父进程的 serv_sock：%d,clnt_sock:%d\n", serv_sock, clnt_sock);
|
||
if (clnt_sock == -1)
|
||
continue;
|
||
else
|
||
puts("new client connected...");
|
||
pid = fork(); //此时，父子进程分别带有一个套接字
|
||
if (pid == -1)
|
||
{
|
||
close(clnt_sock);
|
||
continue;
|
||
}
|
||
if (pid == 0) //子进程运行区域,此部分向客户端提供回声服务
|
||
{
|
||
printf("子进程的 serv_sock：%d,clnt_sock:%d\n", serv_sock, clnt_sock);
|
||
close(serv_sock); //关闭服务器套接字，因为从父进程传递到了子进程
|
||
while ((str_len = read(clnt_sock, buf, BUFSIZ)) != 0)
|
||
write(clnt_sock, buf, str_len);
|
||
|
||
close(clnt_sock);
|
||
puts("client disconnected...");
|
||
return 0;
|
||
}
|
||
else
|
||
close(clnt_sock); //通过 accept 函数创建的套接字文件描述符已经复制给子进程，因为服务器端要销毁自己拥有的
|
||
}
|
||
close(serv_sock);
|
||
|
||
return 0;
|
||
}
|
||
|
||
void error_handling(char *message)
|
||
{
|
||
fputs(message, stderr);
|
||
fputc('\n', stderr);
|
||
exit(1);
|
||
}
|
||
void read_childproc(int sig)
|
||
{
|
||
pid_t pid;
|
||
int status;
|
||
pid = waitpid(-1, &status, WNOHANG);
|
||
printf("removed proc id: %d \n", pid);
|
||
}
|