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-.Dd July 2, 2022
-.Dt PSELECT 2
-.Os
-.Sh NAME
-.Nm pselect
-.Nd synchronous I/O multiplexing a la POSIX.1g
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/select.h
-.Ft int
-.Fo pselect
-.Fa "int nfds"
-.Fa "fd_set * restrict readfds"
-.Fa "fd_set * restrict writefds"
-.Fa "fd_set * restrict exceptfds"
-.Fa "const struct timespec * restrict timeout"
-.Fa "const sigset_t * restrict newsigmask"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn pselect
-function was introduced by
-.St -p1003.1g-2000
-as a slightly stronger version of
-.Xr select 2 .
-The
-.Fa nfds , readfds , writefds ,
-and
-.Fa exceptfds
-arguments are all identical to the analogous arguments of
-.Fn select .
-The
-.Fa timeout
-argument in
-.Fn pselect
-points to a
-.Vt "const struct timespec"
-rather than the potentially modifiable
-.Vt "struct timeval"
-used by
-.Fn select ;
-as in
-.Fn select ,
-a null pointer may be passed to indicate that
-.Fn pselect
-should wait indefinitely.
-Finally,
-.Fa newsigmask
-specifies a signal mask which is set while waiting for input.
-When
-.Fn pselect
-returns, the original signal mask is restored.
-If
-.Fa newsigmask
-is a null pointer,
-.Fn pselect
-behaves like
-.Fn select
-with no setting or restoration of the signal mask.
-.Pp
-See
-.Xr select 2
-for a more detailed discussion of the semantics of this interface, and
-for macros used to manipulate the
-.Vt "fd_set"
-data type.
-.Sh RETURN VALUES
-The
-.Fn pselect
-function returns the same values and under the same conditions as
-.Fn select .
-.Sh ERRORS
-The
-.Fn pselect
-function may fail for any of the reasons documented for
-.Xr select 2
-and (if a signal mask is provided)
-.Xr sigprocmask 2 .
-.Sh SEE ALSO
-.Xr kqueue 2 ,
-.Xr poll 2 ,
-.Xr select 2 ,
-.Xr sigprocmask 2 ,
-.Xr sigsuspend 2
-.Sh STANDARDS
-The
-.Fn pselect
-function conforms to
-.St -p1003.1-2001 .
-.Sh HISTORY
-The
-.Fn pselect
-function first appeared in
-.Fx 5.0 .
-.Sh AUTHORS
-The first implementation of
-.Fn pselect
-function and this manual page were written by
-.An Garrett Wollman Aq Mt wollman@FreeBSD.org .