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100 lines
2.8 KiB
Groff
100 lines
2.8 KiB
Groff
.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in
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.\" the documentation and/or other materials provided with the
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.\" distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.Dd February 19, 2011
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.Dt PTHREAD_SIGMASK 3
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.Os
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.Sh NAME
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.Nm pthread_sigmask
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.Nd examine and/or change a thread's signal mask
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.Sh LIBRARY
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.Lb libpthread
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.Sh SYNOPSIS
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.In pthread.h
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.In signal.h
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.Ft int
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.Fn pthread_sigmask "int how" "const sigset_t * restrict set" \
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"sigset_t * restrict oset"
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.Sh DESCRIPTION
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The
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.Fn pthread_sigmask
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function examines and/or changes the calling thread's signal mask.
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.Pp
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If
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.Fa set
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is not
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.Dv NULL ,
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it specifies a set of signals to be modified, and
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.Fa how
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specifies what to set the signal mask to:
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.Bl -tag -width SIG_UNBLOCK
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.It Dv SIG_BLOCK
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Union of the current mask and
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.Fa set .
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.It Dv SIG_UNBLOCK
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Intersection of the current mask and the complement of
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.Fa set .
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.It Dv SIG_SETMASK
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.Fa set .
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.El
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.Pp
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If
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.Fa oset
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is not NULL, the previous signal mask is stored in the location pointed to by
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.Fa oset .
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.Pp
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.Dv SIGKILL
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and
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.Dv SIGSTOP
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cannot be blocked, and will be silently ignored if included in the signal mask.
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.Sh RETURN VALUES
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If successful,
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.Fn pthread_sigmask
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returns 0.
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Otherwise, an error is returned.
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.Sh ERRORS
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The
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.Fn pthread_sigmask
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function will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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.Fa how
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is not one of the defined values.
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.El
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.Sh SEE ALSO
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.Xr sigaction 2 ,
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.Xr sigpending 2 ,
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.Xr sigprocmask 2 ,
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.Xr sigsuspend 2 ,
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.Xr sigsetops 3
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.Sh STANDARDS
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The
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.Fn pthread_sigmask
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function conforms to
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.St -p1003.1-96
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