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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 analogous 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 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)

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>.