time.c

一个C语言的SOCKET程序

#include <stdio.h>
#include <time.h>
#include <sys/time.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>

char *GetTime();
char *GetFmtTime();
int timeoutopen(int timeout);
int timeoutclose();

static char times[30];
char *GetTime()
{
  time_t t;
  struct tm tm;

  memset(times,0,sizeof(times));
  t=time(NULL);
  memcpy(&tm,localtime(&t),sizeof(struct tm));
  sprintf(times,"%04d%02d%02d%02d%02d%02d",
                    tm.tm_year+1900,tm.tm_mon+1,tm.tm_mday,
                    tm.tm_hour,tm.tm_min,tm.tm_sec);
  return(times);
}

char *GetFmtTime()
{
  time_t t;
  struct tm tm;

  memset(times,0,sizeof(times));
  t=time(NULL);
  memcpy(&tm,localtime(&t),sizeof(struct tm));
  sprintf(times,"%04d/%02d/%02d %02d:%02d:%02d",
                    tm.tm_year+1900,tm.tm_mon+1,tm.tm_mday,
                    tm.tm_hour,tm.tm_min,tm.tm_sec);
  return(times);
}

static void (*alrm_old)(int);
void   timeout_p(int v_sig)
{ 
  return;
}

int timeoutopen(int timeout)
{   
    alrm_old= signal(SIGALRM,timeout_p);
    alarm(timeout);
}
int timeoutclose()
{   int timeleft;
    timeleft=alarm(0);
    signal(SIGALRM,alrm_old);
    return(timeleft);
}

int TimeOut(int fd,int timeout)
{
  struct timeval t;
  fd_set fdset;

  t.tv_sec=timeout;
  t.tv_usec=0;
  
  FD_ZERO(&fdset);
  FD_SET(fd,&fdset);

  select(fd+1,&fdset,NULL,NULL,&t);
 
  if (FD_ISSET(fd,&fdset))
  {
    ShowMsg("fd %d can been read ! \n",fd);
    return(0);
  }
  else
  {
    ShowMsg("fd %d can not been read now! timeout=%d \n",fd,timeout);
    return(1);
  }
}


/*main()
{ int i,j;
  char c[50];
 i=getpid();j=getppid();
 printf("pid=%d ppid=%d\n",i,j);
 getHostTime(c);
 printf("time=%s\n",c);
}*/
/*
main()
{
  printf("time=%s\n",GetTime());
  printf("fmttime=%s\n",GetFmtTime());
}
*/
/*main()
{ char buf[30]; int timeleft;
  timeoutopen(30);
  scanf("%s",buf); 
  timeleft=timeoutclose();
  printf("timeleft=%d\n",timeleft);
}*/ 

/*
char MsgLog[30]="./test.log";
main()
{
  if (TimeOut(0,5)) printf("timeout \n");
  else printf("can read\n");
}*/