linux C语言select函数怎么不能实现sleep呀？

答案：我修改了一下，运行一下试试，祝你好运：

#include <stdio.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

int main()
{
        struct timeval tv;
        int i =0;
        while( i++ < 10)
        {
                 tv.tv_sec = 1;
                tv.tv_usec = 0;
                printf("%d\n", i);
                fflush(stdout);
                int ret = select (0, NULL, NULL, NULL, &tv);
                if (ret == -1)
                {
                        fprintf (stdout, "select error . errno=%d [%s]\n", errno, strerror(errno));
                        break;
                }
                //sleep(1);
                //usleep(1000000);
        }
        return 0;
}

其他：无回显输入
noecho();



参考例子;

#include<stdlib.h>;
#include<stdio.h>;
#include<termios.h>;
#include<string.h>;

static struct termios stored_settings1;
static struct termios stored_settings2;

void echo_off(void)
{
   struct termios new_settings;
   tcgetattr(0,&stored_settings1);
   new_settings =stored_settings1;
   new_settings.c_lflag &= (~ECHO);
   tcsetattr(0,TCSANOW,&new_settings);
   return;

}

void echo_on(void)
{
  tcsetattr(0,TCSANOW,&stored_settings1);
  return;
}


void set_keypress(void)
{
  struct termios new_settings;
  tcgetattr(0,&stored_settings2);
  new_settings = stored_settings2;
  
  /*Disable canornical mode, and set buffer size to 1 byte */
  new_settings.c_lflag&=(~ICANON);
  new_settings.c_cc[VTIME] = 0;
  new_settings.c_cc[VMIN] = 1;
  
  tcsetattr(0, TCSANOW, &new_settings);
  return;

}
void reset_keypress(void)
{
  tcsetattr(0, TCSANOW, &stored_settings2);
  return;
}
int main()
{

  printf("========================\n");
  printf("0. Main menu\n");
  printf("1. Chapter one\n");
  printf("2. Chapter two\n");
  printf("3. Chapter three\n");
  printf("========================\n");
  echo_off();
  set_keypress();
  char ch;
  while((ch = getchar() ) != 'q')
  {
    switch(ch)
    {
      case '0':
        printf("In main menu.\n");break;
      case '1':
        printf("Entering chapter one\n");break;
      case '2':
        printf("Entering chapter two\n");break;
      case '3':
        printf("Entering chapter three\n");break;
      default:
        printf("Entering other chapter.\n");
     }
   }  
  reset_keypress();
  echo_on();
  return 0;

  
}
 

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