help! poll() function question!

fanyunfei

#include        <sys/poll.h>
#include        <unistd.h>
#include        <stdlib.h>
#include        <stdio.h>

#define BUFFSIZE 80

void err_msg(const char *p_error);

int main(void)
{
        struct pollfd        fdarray[1];
        char   buf[BUFFSIZE];       
        int    readn;       

        // initial structure member
        fdarray[0].fd      = STDIN_FILENO;
        fdarray[0].events  = POLLIN;
        fdarray[0].revents = 0;               

        if (poll(fdarray, 1, 0) == -1)
                err_msg("poll error.\n";

        if (fdarray[0].revents) { // I think question is here
                if ((readn = read(STDIN_FILENO, buf, BUFFSIZE)) < 0)
                        err_msg("read error.\n";
                if (write(STDOUT_FILENO, buf, readn) != readn)
                        err_msg("write error.\n";
        }
               
        exit(0);
}

void err_msg(const char *p_error)
{
        fprintf(stderr, p_error);
       
        exit(1);
}

====================

I want to test STDIN_FILENO desciptor, I think STDIN_FILENO descriptor is not block, but why I can't input string, program already over. where error?

please help me, sorry My system have no chinese input and my english  is very poor, sorry!

lenovo

请仔细阅读poll的man pages。
里面有你的答案。

fanyunfei

thank you

fanyunfei

thank lenovo, I already find my question. thank you