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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>.