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Man Pages


Manual Reference Pages  -  PSELECT (2)

NAME

pselect - synchronous I/O multiplexing a la POSIX.1g

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
Standards
History
Authors

LIBRARY


.Lb libc

SYNOPSIS


.In sys/select.h int
.Fo pselect int nfds fd_set * restrict readfds fd_set * restrict writefds fd_set * restrict exceptfds const struct timespec * restrict timeout const sigset_t * restrict newsigmask
.Fc

DESCRIPTION

The pselect function was introduced by -p1003.1g-2000 as a slightly stronger version of select(2). The nfds, readfds, writefds, and exceptfds arguments are all identical to the analogous arguments of select. The timeout argument in pselect points to a
.Vt const struct timespec rather than the (modifiable)
.Vt struct timeval used by select; as in select, a null pointer may be passed to indicate that pselect should wait indefinitely. Finally, newsigmask specifies a signal mask which is set while waiting for input. When pselect returns, the original signal mask is restored.

See select(2) for a more detailed discussion of the semantics of this interface, and for macros used to manipulate the
.Vt fd_set data type.

RETURN VALUES

The pselect function returns the same values and under the same conditions as select.

ERRORS

The pselect function may fail for any of the reasons documented for select(2) and (if a signal mask is provided) sigprocmask(2).

SEE ALSO

kqueue(2), poll(2), select(2), sigprocmask(2), sigsuspend(2)

STANDARDS

The pselect function conforms to -p1003.1-2001.

HISTORY

The pselect function first appeared in
.Fx 5.0 .

AUTHORS

The first implementation of pselect function and this manual page were written by
.An Garrett Wollman Aq wollman@FreeBSD.org .
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