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 April 27, 2000 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 libc_r 37.Lb libpthread 38.Lb libthr 39.Sh SYNOPSIS 40.In pthread.h 41.In signal.h 42.Ft int 43.Fn pthread_sigmask "int how" "const sigset_t *set" "sigset_t *oset" 44.Sh DESCRIPTION 45The 46.Fn pthread_sigmask 47function examines and/or changes the calling thread's signal mask. 48.Pp 49If 50.Fa set 51is not 52.Dv NULL , 53it specifies a set of signals to be modified, and 54.Fa how 55specifies what to set the signal mask to: 56.Bl -tag -width SIG_UNBLOCK 57.It Dv SIG_BLOCK 58Union of the current mask and 59.Fa set . 60.It Dv SIG_UNBLOCK 61Intersection of the current mask and the complement of 62.Fa set . 63.It Dv SIG_SETMASK 64.Fa set . 65.El 66.Pp 67If 68.Fa oset 69is not NULL, the previous signal mask is stored in the location pointed to by 70.Fa oset . 71.Pp 72.Dv SIGKILL 73and 74.Dv SIGSTOP 75cannot be blocked, and will be silently ignored if included in the signal mask. 76.Sh RETURN VALUES 77If successful, 78.Fn pthread_sigmask 79returns 0. 80Otherwise, an error is returned. 81.Sh ERRORS 82The 83.Fn pthread_sigmask 84function will fail if: 85.Bl -tag -width Er 86.It Bq Er EINVAL 87.Fa how 88is not one of the defined values. 89.El 90.Sh SEE ALSO 91.Xr sigaction 2 , 92.Xr sigpending 2 , 93.Xr sigprocmask 2 , 94.Xr sigsuspend 2 , 95.Xr sigsetops 3 96.Sh STANDARDS 97The 98.Fn pthread_sigmask 99function conforms to 100.St -p1003.1-96 101