Linux传统Fork多进程并发网络编程代码 ,只是简单实现了一个多进程并发的模型,如果需要真实应用,则需要修改process_client方法即可。这种方式并发编程负载能力不怎么样,但是有一个好处就是, 当子进程处理异常时,哪怕是指针异常导致的段错误,崩溃不会影响主进程。
服务端代码:
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//Linux传统Fork多进程并发网络编程代码
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/* sokcet_fork.c*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#define PORT 9999
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#define MAXSOCKFD 10
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int process_client( int connfd );
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void handle_sigcld(int signo);
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int main( int argc, char *argv[] )
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{
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int sockfd, connfd;
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struct sockaddr_in servaddr, cliaddr;
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socklen_t cliaddr_len;
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fd_set readfds;
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char buffer[256];
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char msg[] = "Welcome to server!";
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if ( (sockfd=socket(AF_INET,SOCK_STREAM,0))<0 )
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{
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perror("socket");
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return 1;
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}
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bzero(&servaddr, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_port = htons(PORT);
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servaddr.sin_addr.s_addr = htonl( INADDR_ANY );
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int reuse = 1;
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if(setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
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&reuse, sizeof(int)) < 0){
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perror("setsockopt error");
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return 1;
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}
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if ( bind(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr) ) != 0 )
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{
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perror("connetc");
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return 1;
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}
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if ( listen(sockfd,5) != 0 )
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{
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perror("listen");
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return 1;
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}
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//允许中断退出
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#if 0
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signal(SIGCLD, SIG_IGN); /* now I don't have to wait()! */
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#else
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signal(SIGCLD, handle_sigcld); /* 处理中断信息*/
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#endif
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while (1)
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{
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cliaddr_len = sizeof( struct sockaddr);
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connfd = accept(sockfd, (struct sockaddr*)&cliaddr,&cliaddr_len );
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if (connfd < 0 ){
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perror("accept");
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continue;
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}
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printf("connetc from %s,sockeid:%d\r\n", inet_ntoa(cliaddr.sin_addr), connfd );
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//if ( connfd == 0)continue;
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int fid = fork();
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if ( fid < 0 )
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break;
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else if ( fid == 0 ){
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printf("child process \r\n");
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//处理客户端请求数据
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process_client(connfd);
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//退出子进程
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return 0;
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//exit(0);
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}
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else {
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// 父进程继续处理连接请求
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continue;
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}
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}
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return 0;
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}
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int process_client( int connfd )
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{
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char buffer[1024];
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bzero(buffer,sizeof(buffer));
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if ( read(connfd,buffer,4)<=0 ){
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return -1;
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}
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int len = atoi(buffer);
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printf("packet length:%04d\n", len );
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bzero(buffer,sizeof(buffer));
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if ( read(connfd,buffer,len)<=0 )
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{
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printf("connetc closed.\r\n");
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}
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else
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{
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printf("recv from client:[%s]\r\n",buffer);
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}
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/*将小写转换成大写*/
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int i = 0;
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while ( i<len ){
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char c = *(buffer+i);
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if ( c>='a' && c<='z' )
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*(buffer+i) -= ('a'-'A');
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i++;
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}
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//模拟5秒等待时间
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sleep(5);
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write(connfd, buffer, strlen(buffer) );
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printf("return client:[%s]\r\n",buffer);
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return 0;
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}
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void handle_sigcld(int signo)
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{
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int pid,status;
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pid = waitpid( -1, &status, 0);//-1表示等待任何子进程
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//printf("child process %d exit with %d\n",pid,status);
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}
客户端代码 a.c :
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <strings.h>
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#define PORT 9999
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#define SERVER_IP "127.0.0.1"
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//#define SERVER_IP "192.168.1.3"
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int main()
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{
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int s;
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struct sockaddr_in addr;
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char buffer[256];
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if ( (s=socket(AF_INET,SOCK_STREAM,0)) < 0 )
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{
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perror("socket");
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exit(1);
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}
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char server_info[1024] = {0x00};
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sprintf( server_info, "port=%d,ip=%s", PORT, SERVER_IP);
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printf( "%s\n", server_info );
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bzero( &addr, sizeof(addr) );
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addr.sin_family = AF_INET;
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addr.sin_port = htons(PORT);
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addr.sin_addr.s_addr = inet_addr(SERVER_IP);
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int nret = connect(s, (const struct sockaddr *)&addr,sizeof(addr));
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if ( nret < 0)
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{
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//printf("test string here\n");
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perror("connect &*******");
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exit(1);
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}
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printf("nret:%d\n", nret);
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memset(buffer, 0x00, sizeof(buffer) );
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char *psend = "test string";
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snprintf(buffer, sizeof(buffer), "%04d%s", strlen(psend), psend );
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if ( send(s,buffer,strlen(buffer),0) < 0 )
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{
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perror("send");
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return 1;
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}
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memset(buffer,0x00, sizeof(buffer) );
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recv( s, buffer,sizeof(buffer),0);
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printf("recv:%s\r\n",buffer);
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return 0;
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}
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