system.c

一个C语言编写的串口程序

#include <stdio.h>
#include <stdlib.h>

static int ListenSock;

void DownListen(int Sig)
{
  sockClose(ListenSock);
  ShowMsg("DownListen\n");
  exit(0);
}

int main(int argc,char *argv[])
{ 
  int  ChildPid;
  int  sock; char Sock[20];

  SIGNAL(DownListen);

  if ((ListenSock=sockServerOpen(atoi(argv[1]),atoi(argv[2])))<=0) 
  {ShowMsg("Listen Sock failed\n"); exit(0);}
  sockLook(ListenSock);

  while(1)
  {
   if ((sock=sockListen(ListenSock))<=0) 
   { printf("listen sock failed\n");continue;} 

   sockLook(sock);
   
   switch (ChildPid=fork())
   {
  case -1: sockClose(sock);
           printf("fork failed\n");
           break;
  case 0:  
           sockClose(ListenSock);
           sprintf(Sock,"%d",sock);
           execlp("tcpconnect","tcpconnect",Sock,NULL);
           printf("execl failed\n");
           sockClose(sock);
           exit(0); 
           break;
   default:
            sockClose(sock);
            break;
   }
             
  }
 }