linux socket编程多协议服务器例子

最新推荐文章于 2025-04-14 20:14:25 发布

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#socket #服务器 #linux #编程 #struct #null

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本文介绍了一个同时处理 TCP 和 UDP 连接的服务器程序示例。该服务器使用多路复用 select 函数来监听连接请求，并通过信号处理子进程退出情况。对于 TCP 连接，服务器接收客户端消息并回传；对于 UDP，则直接进行消息往返。

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#include <stdarg.h>
#include <stdio.h>
#include <signal.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/select.h>
void sig_child() {
pid_t pid;
int status;
while((pid=waitpid(-1,&status,WNOHANG))>0)
printf("%d terminated!/n",pid);
// while(wait(&status)>0);
}

void dealtcp(int s,struct sockaddr_in *remote) {
     int len;
     time_t ti;
     char buff[128];
     printf("connection from: %s:%d/n",inet_ntoa(remote->sin_addr),ntohs(remote->sin_port));
     ti=time(NULL);
     //snprintf(buff,sizeof(buff),"%s/r/n",ctime(&ti));
while((len=recv(s,buff,sizeof(buff),0))>0) {
  buff[len]='/0';
       send(s, buff,strlen(buff), 0);
  bzero(buff,sizeof(buff));
}

}
int main(int argc, char **argv) {
    struct sockaddr_in remote;
    char *hname, *sname;
    int s, c, len,fd,s1,n;
    pid_t pid;
    fd_set rset,allset;
    int client[1024];
    int i,maxi,maxfd,nready;
    char buff[1024];
    if(argc < 2)
    error(1,0,"parameters less than 2");
    else if(argc == 2) {
    hname = NULL;
sname = argv[1];
    }
    else if(argc == 3) {
    hname = argv[1];
sname = argv[2];
    }

    s = server(hname, sname,"tcp");
    s1 = server(hname, sname,"udp");
    signal(SIGCHLD,sig_child);

    len = sizeof(struct sockaddr);
    maxfd = s>s1?s:s1;

    while(1) {
    FD_SET(s,&rset);
FD_SET(s1,&rset);
if((nready=select(maxfd+1,&rset,NULL,NULL,NULL))<0)
  error(1,0,"select error!!");
if(FD_ISSET(s,&rset)) {
      if((c=accept(s,(struct sockaddr *)&remote,&len))<=0){
          error(1,errno,"accept error!");
  }
  if(fork()>0){
   close(c);
  }
  else {
   close(s);
   dealtcp(c,&remote);
   exit(0);
  }
}
if(FD_ISSET(s1,&rset)) {
       n=recvfrom(s1,buff,sizeof(buff),0,(struct sockaddr *)&remote,&len);
       sendto(s1,buff,n,0,(struct sockaddr *)&remote,sizeof(remote));
}
     }
    close(s);
    close(s1);
    exit(0);
}