pselect man page on FreeBSD

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PSELECT(2)		    BSD System Calls Manual		    PSELECT(2)

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.

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 first implementation of pselect() function and this manual page were
     written by Garrett Wollman ⟨wollman@FreeBSD.org⟩.

BSD			       October 27, 2009				   BSD
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