1.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice(s), this list of conditions and the following disclaimer as 9.\" the first lines of this file unmodified other than the possible 10.\" addition of one or more copyright notices. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice(s), this list of conditions and the following disclaimer in 13.\" the documentation and/or other materials provided with the 14.\" distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 17.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 20.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 23.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 25.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 26.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27.\" 28.\" $FreeBSD$ 29.Dd February 19, 2011 30.Dt PTHREAD_SIGMASK 3 31.Os 32.Sh NAME 33.Nm pthread_sigmask 34.Nd examine and/or change a thread's signal mask 35.Sh LIBRARY 36.Lb libpthread 37.Sh SYNOPSIS 38.In pthread.h 39.In signal.h 40.Ft int 41.Fn pthread_sigmask "int how" "const sigset_t * restrict set" \ 42 "sigset_t * restrict oset" 43.Sh DESCRIPTION 44The 45.Fn pthread_sigmask 46function examines and/or changes the calling thread's signal mask. 47.Pp 48If 49.Fa set 50is not 51.Dv NULL , 52it specifies a set of signals to be modified, and 53.Fa how 54specifies what to set the signal mask to: 55.Bl -tag -width SIG_UNBLOCK 56.It Dv SIG_BLOCK 57Union of the current mask and 58.Fa set . 59.It Dv SIG_UNBLOCK 60Intersection of the current mask and the complement of 61.Fa set . 62.It Dv SIG_SETMASK 63.Fa set . 64.El 65.Pp 66If 67.Fa oset 68is not NULL, the previous signal mask is stored in the location pointed to by 69.Fa oset . 70.Pp 71.Dv SIGKILL 72and 73.Dv SIGSTOP 74cannot be blocked, and will be silently ignored if included in the signal mask. 75.Sh RETURN VALUES 76If successful, 77.Fn pthread_sigmask 78returns 0. 79Otherwise, an error is returned. 80.Sh ERRORS 81The 82.Fn pthread_sigmask 83function will fail if: 84.Bl -tag -width Er 85.It Bq Er EINVAL 86.Fa how 87is not one of the defined values. 88.El 89.Sh SEE ALSO 90.Xr sigaction 2 , 91.Xr sigpending 2 , 92.Xr sigprocmask 2 , 93.Xr sigsuspend 2 , 94.Xr sigsetops 3 95.Sh STANDARDS 96The 97.Fn pthread_sigmask 98function conforms to 99.St -p1003.1-96 100