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