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PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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poll.h(0P) POSIX Programmer's Manual poll.h(0P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
poll.h — definitions for the poll() function
#include <poll.h>
The <poll.h> header shall define the pollfd structure, which shall
include at least 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 shall define the following type through
typedef:
nfds_t An unsigned integer type used for the number of file
descriptors.
The implementation shall support 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.
The <poll.h> header shall define the following symbolic constants,
zero or more of which may be OR'ed together to form the events or
revents members in the pollfd structure:
POLLIN Data other than high-priority data may be read
without blocking.
POLLRDNORM Normal data may be read without blocking.
POLLRDBAND Priority data may be read without blocking.
POLLPRI High priority data may be read without blocking.
POLLOUT Normal data may be written without blocking.
POLLWRNORM Equivalent to POLLOUT.
POLLWRBAND Priority data may 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.
The following shall be declared as a function and may also be
defined as a macro. A function prototype shall be provided.
int poll(struct pollfd [], nfds_t, int);
The following sections are informative.
None.
None.
None.
The System Interfaces volume of POSIX.1‐2017, confstr(3p),
poll(3p)
The Shell and Utilities volume of POSIX.1‐2017, getconf(1p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard,
the original IEEE and The Open Group Standard is the referee
document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 poll.h(0P)
Pages that refer to this page: poll(3p)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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