poll.2 (2010 09)

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poll(2) poll(2)

fds.fd = 0;

fds.events = POLLNORM;

poll(&fds, 1, -1);

Wait for input on ifd1

and ifd2, output on ofd, giving up after 10 seconds:

#include <poll.h>

struct pollfd fds[3];

int ifd1, ifd2, ofd, count;

fds[0].fd = ifd1;

fds[0].events = POLLNORM;

fds[1].fd = ifd2;

fds[1].events = POLLNORM;

fds[2].fd = ofd;

fds[2].events = POLLOUT;

count = poll(fds, 3, 10000);

if (count == -1) {

perror("poll failed");

exit(1);

}

if (count==0)

printf("No data for reading or writing\n");

if (fds[0].revents & POLLNORM)

printf("There is data for reading fd %d\n", fds[0].fd);

if (fds[1].revents & POLLNORM)

printf("There is data for reading fd %d\n", fds[1].fd);

if (fds[2].revents & POLLOUT)

printf("There is room to write on fd %d\n", fds[2].fd);

Check for input or output on ﬁle descriptor 5 without waiting:

#include <poll.h>

struct pollfd fds;

fds.fd = 5;

fds.events = POLLNORM|POLLOUT;

poll(&fds, 1, 0);

if (fds.revents & POLLNORM)

printf("There is data available on fd %d\n", fds.fd);

if (fds.revents & POLLOUT)

printf("There is room to write on fd %d\n", fds.fd);

Wait 3.5 seconds:

#include <stdio.h>

#include <poll.h>

poll((struct pollfd *) NULL, 0, 3500);

Wait for a high priority, priority, or normal message on streams ﬁle descriptor 0:

#include <poll.h>

struct pollfd fds;

fds.fd = 0;

fds.events = POLLIN|POLLPRI;

poll(&fds, 1, -1);