mirror of
https://github.com/riba2534/TCP-IP-NetworkNote.git
synced 2026-02-03 01:53:19 +08:00
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <pthread.h>
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#define BUF_SIZE 100
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#define MAX_CLNT 256
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void *handle_clnt(void *arg);
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void send_msg(char *msg, int len);
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void error_handling(char *msg);
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int clnt_cnt = 0;
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int clnt_socks[MAX_CLNT];
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pthread_mutex_t mutx;
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int main(int argc, char *argv[])
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{
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int serv_sock, clnt_sock;
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struct sockaddr_in serv_adr, clnt_adr;
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int clnt_adr_sz;
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pthread_t t_id;
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if (argc != 2)
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{
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printf("Usage : %s <port>\n", argv[0]);
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exit(1);
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}
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pthread_mutex_init(&mutx, NULL); //创建互斥锁
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serv_sock = socket(PF_INET, SOCK_STREAM, 0);
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memset(&serv_adr, 0, sizeof(serv_adr));
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serv_adr.sin_family = AF_INET;
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serv_adr.sin_addr.s_addr = htonl(INADDR_ANY);
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serv_adr.sin_port = htons(atoi(argv[1]));
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if (bind(serv_sock, (struct sockaddr *)&serv_adr, sizeof(serv_adr)) == -1)
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error_handling("bind() error");
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if (listen(serv_sock, 5) == -1)
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error_handling("listen() error");
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while (1)
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{
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clnt_adr_sz = sizeof(clnt_adr);
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clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_adr, &clnt_adr_sz);
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pthread_mutex_lock(&mutx); //上锁
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clnt_socks[clnt_cnt++] = clnt_sock; //写入新连接
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pthread_mutex_unlock(&mutx); //解锁
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pthread_create(&t_id, NULL, handle_clnt, (void *)&clnt_sock); //创建线程为新客户端服务，并且把clnt_sock作为参数传递
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pthread_detach(t_id); //引导线程销毁，不阻塞
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printf("Connected client IP: %s \n", inet_ntoa(clnt_adr.sin_addr)); //客户端连接的ip地址
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}
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close(serv_sock);
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return 0;
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}
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void *handle_clnt(void *arg)
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{
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int clnt_sock = *((int *)arg);
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int str_len = 0, i;
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char msg[BUF_SIZE];
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while ((str_len = read(clnt_sock, msg, sizeof(msg))) != 0)
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send_msg(msg, str_len);
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//接收到消息为0，代表当前客户端已经断开连接
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pthread_mutex_lock(&mutx);
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for (i = 0; i < clnt_cnt; i++) //删除没有连接的客户端
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{
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if (clnt_sock == clnt_socks[i])
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{
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while (i++ < clnt_cnt - 1)
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clnt_socks[i] = clnt_socks[i + 1];
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break;
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}
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}
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clnt_cnt--;
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pthread_mutex_unlock(&mutx);
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close(clnt_sock);
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return NULL;
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}
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void send_msg(char *msg, int len) //向连接的所有客户端发送消息
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{
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int i;
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pthread_mutex_lock(&mutx);
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for (i = 0; i < clnt_cnt; i++)
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write(clnt_socks[i], msg, len);
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pthread_mutex_unlock(&mutx);
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}
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void error_handling(char *msg)
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{
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fputs(msg, stderr);
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fputc('\n', stderr);
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exit(1);
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} |