一个简单的客户/服务器应用(socket 学习)

/* 子进程为客户方,父进程为服务器方。当客户请求通过socket传送给服务器方时,服务器会将当前的系统时间返回给客户

   该程序参考自《实战linux socket 编程 》 Warren W.Gay

*/


#include

#include
#include
#include
#include
#include
#include
#include
#include


int main(int argc,char **argv)
{
 int z;
 int s[2];
 char *msgp;
 int mlen;
 char buf[80];
  pid_t chpid;
  z=socketpair(AF_LOCAL,SOCK_STREAM,0,s);
  if(z==-1)
  {
   fprintf(stderr,"%s:socketpair(AF_LOCAL,SOCK_STREAM,0)\n",strerror(errno));
    exit(1);
  }
  if((chpid=fork())==(pid_t)-1)
  {
    fprintf(stderr,"%s:fork(2)\n",strerror(errno));
    exit(1);
  }
  else if(chpid==0)
  {
 /*子进程,客户端*/
  char rxbuf[80];
  printf("Parent PID is %ld",(long)getppid());
  close(s[0]);
  s[0]=-1;
  msgp="%A %d-%b-%Y %1:%M %p";
  mlen=strlen(msgp);
  printf("Child sending request '%s'\n",msgp);
 /*向服务器写入请求*/
  z=write(s[1],msgp,mlen);
  /*if(shutdown(s[1],SHUT_WR)==-1)
  {
   fprintf(stderr,"%s:shutdown(2)\n",strerror(errno));
   exit(1);
  } */

  z=read(s[1],rxbuf,sizeof rxbuf);
  if(z<0)
  {
  fprintf(stderr,"%s:read(2)\n",strerror(errno));
  exit(1);
  }
  rxbuf[z]=0;
  printf("Server returned '%s'\n",rxbuf);
  fflush(stdout);
  close(s[1]);
 }
  else
  {
  int status;
  char txbuf[80];
  time_t td;

  printf("child PID is %ld",(long)chpid);
  fflush(stdout);

  close(s[1]);
  s[1]=-1;
  z=read(s[0],buf,sizeof buf);
  if(z<0)
  {
  fprintf(stderr,"%s:read(2)\n",strerror(errno));
  exit(1);
  }
  buf[z]=0;
  time(&td);
  strftime(txbuf,sizeof txbuf,buf,localtime(&td));
  z=write(s[0],txbuf,strlen(txbuf));
  if(z<0)
  {
   fprintf(stderr,"%s:write(2)\n",strerror(errno));
   exit(1);
  }
  close(s[0]);
 waitpid(chpid,&status,0);
 }
  return 0;
}
                                                                                                                                                                       
                                                                                                                                                                       
                                                                                                                                                                       
                                                                                                                                                                       
                                                                                                                                                                       
                                                                                                                                                                       
                                                                                                                                                                      
                                                                                                                                                                       
                                                                                                                                                                       
                                                                                                                                                                                                                                                                                                                  

                                                                                                       

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