pselect(3) BSD Library Functions Manual pselect(3)
NAME
pselect -- synchronous I/O multiplexing a la POSIX.1g
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
pselect(int nfds, fd_set *restrict readfds, fd_set *restrict writefds,
fd_set *restrict errorfds, const struct timespec *restrict timeout,
const sigset_t *restrict sigmask);
DESCRIPTION
The pselect() function was introduced by IEEE Std 1003.1g-2000
(``POSIX.1'') as a slightly stronger version of select(2). The nfds,
readfds, writefds, and errorfds arguments are all identical to the analo-
gous arguments of select(). The timeout argument in pselect() points to
a const struct timespec, rather than the (modifiable) struct timeval used
by select(); as in select(), a null pointer may be passed to indicate
that pselect() should wait indefinitely. Finally, sigmask 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 fd_set data type.
IMPLEMENTATION NOTES
The pselect() function is implemented in the C library as a wrapper
around select().
RETURN VALUES
The pselect() function returns the same values and under the same condi-
tions 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)
STANDARDS
The pselect() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The pselect() function first appeared in FreeBSD 5.0.
AUTHORS
The pselect() function and this manual page were written by Garrett
Wollman <wollman@FreeBSD.org>.
BSD June 16, 2002 BSD
Mac OS X 10.8 - Generated Wed Aug 29 19:29:29 CDT 2012