8_4_poll

xxha000721

linux poll用法

1. int main(void){
   
2.         struct pollfd fds[2];
   
3.         int ret;
   
4.         int i = 0;
   
5.         fds[0].fd = STDIN_FILENO;
   
6.         fds[0].events = POLLIN;
   
7.         fds[1].fd = STDOUT_FILENO;
   
8.         fds[1].events = POLLOUT;
   
9. 
   
10.         while(i<5){
    
11.         ret = poll(fds,2,TIMEOUT*1000);
    
12.                 if(ret == -1){
    
13.                         perror("poll");
    
14.                         return 1;
    
15.                 }
    
16.                 if(!ret){
    
17.                         printf("%d seconds elapsed. \n",TIMEOUT);
    
18.                 }
    
19.                 if(fds[0].revents & POLLIN){
    
20.                         printf("stdin is readable\n");
    
21.                 }
    
22.                 if(fds[1].revents & POLLOUT){
    
23.                         printf("stdout is writeable\n");
    
24.                 }
    
25.                 i++;
    
26.         }
    
27.         return 0;
    
28. }