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), sigsuspend(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>.