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-.\" Copyright (c) 1983, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"	@(#)sigprocmask.2	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD$
-.\"
-.Dd May 7, 2010
-.Dt SIGPROCMASK 2
-.Os
-.Sh NAME
-.Nm sigprocmask
-.Nd manipulate current signal mask
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In signal.h
-.Ft int
-.Fo sigprocmask
-.Fa "int how"
-.Fa "const sigset_t * restrict set"
-.Fa "sigset_t * restrict oset"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn sigprocmask
-system call examines and/or changes the current signal mask (those signals
-that are blocked from delivery).
-Signals are blocked if they are members of the current signal mask set.
-.Pp
-If
-.Fa set
-is not null, the action of
-.Fn sigprocmask
-depends on the value of the
-.Fa how
-argument.
-The signal mask is changed as a function of the specified
-.Fa set
-and the current mask.
-The function is specified by
-.Fa how
-using one of the following values from
-.In signal.h :
-.Bl -tag -width SIG_UNBLOCK
-.It Dv SIG_BLOCK
-The new mask is the union of the current mask and the specified
-.Fa set .
-.It Dv SIG_UNBLOCK
-The new mask is the intersection of the current mask
-and the complement of the specified
-.Fa set .
-.It Dv SIG_SETMASK
-The current mask is replaced by the specified
-.Fa set .
-.El
-.Pp
-If
-.Fa oset
-is not null, it is set to
-the previous value of the signal mask.
-When
-.Fa set
-is null,
-the value of
-.Fa how
-is insignificant and the mask remains unset
-providing a way to examine the signal mask without modification.
-.Pp
-The system
-quietly disallows
-.Dv SIGKILL
-or
-.Dv SIGSTOP
-to be blocked.
-.Pp
-In threaded applications,
-.Xr pthread_sigmask 3
-must be used instead of
-.Fn sigprocmask .
-.Sh RETURN VALUES
-.Rv -std sigprocmask
-.Sh ERRORS
-The
-.Fn sigprocmask
-system call will fail and the signal mask will be unchanged if one
-of the following occurs:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa how
-argument
-has a value other than those listed here.
-.El
-.Sh SEE ALSO
-.Xr kill 2 ,
-.Xr sigaction 2 ,
-.Xr sigpending 2 ,
-.Xr sigsuspend 2 ,
-.Xr fpsetmask 3 ,
-.Xr pthread_sigmask 3 ,
-.Xr sigsetops 3
-.Sh STANDARDS
-The
-.Fn sigprocmask
-system call is expected to
-conform to
-.St -p1003.1-90 .