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PSELECT(3)	       FreeBSD Library Functions Manual		    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	9.3			 June 16, 2002			   FreeBSD 9.3

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | IMPLEMENTATION NOTES | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS | HISTORY | AUTHORS

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