From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alessio Sangalli <alesan@manoweb.com>
Subject: Re: Notification when a new device is added or removed
Date: Sat, 28 Feb 2009 18:58:05 -0800
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To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org

Dmitry Torokhov wrote:

> You should be able to poll (select) /proc/bus/input/devices.

Yeah that would be great; anyway, I tried and... well nothing happens. I
am obviously missing something here:


#include <poll.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>

int main()
{
        int fd, c;
        struct pollfd pfd;

        fd=open("/proc/bus/input/devices", O_RDONLY);
        if(fd==-1)
                return -1;
        pfd.fd=fd;
        pfd.events=POLLIN;
        while(1) {
                c=poll(&pfd, 1, 20000);
                if(c==-1)
                        printf("Error polling\n");
                else if(c==0)
                        printf("Timeout\n");
                else
                        printf("Something changed");
        }
}



The result, while I detach or attach new devices is:

Timeout
Timeout
Timeout
Timeout
Timeout



bye
Alessio