pselect(3)
NAME
pselect -- synchronous I/O multiplexing a la POSIX.1g
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/select.h> int 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);
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 exceptfds arguments are all identical to the anal- ogous 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, 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 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>. FreeBSD 5.4 June 16, 2002 FreeBSD 5.4
SPONSORED LINKS
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