poll.h(3HEAD) Headers poll.h(3HEAD)NAME
poll.h, poll - definitions for the poll() function
SYNOPSIS
#include <poll.h>
DESCRIPTION
The <poll.h> header defines the pollfd structure, which includes the
following members:
int fd the following descriptor being polled
short events the input event flags (see below)
short revents the output event flags (see below)
The <poll.h> header defines the following type through typedef:
nfds_t an unsigned integer type used for the number of file descrip‐
tors
The implementation supports one or more programming environments in
which the width of nfds_t is no greater than the width of type long.
The names of these programming environments can be obtained using the
confstr() function or the getconf utility. See confstr(3C) and get‐
conf(1).
The following symbolic constants are defined, zero or more of which can
be OR'ed together to form the events or revents members in the pollfd
structure:
POLLIN Data other than high-priority data can be read without
blocking.
POLLRDNORM Normal data can be read without blocking.
POLLRDBAND Priority data can be read without blocking.
POLLPRI High priority data can be read without blocking.
POLLOUT Normal data can be written without blocking.
POLLWRNORM Equivalent to POLLOUT.
POLLWRBAND Priority data can be written.
POLLERR An error has occurred (revents only).
POLLHUP Device has been disconnected (revents only).
POLLNVAL Invalid fd member (revents only).
The significance and semantics of normal, priority, and high-priority
data are file and device-specific.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│Standard │See standards(5). │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOgetconf(1), poll(2), confstr(3C), attributes(5), standards(5)SunOS 5.11 9 Sep 2004 poll.h(3HEAD)
