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.Dd February 19, 2011 28.Dt PTHREAD_SIGMASK 3 29.Os 30.Sh NAME 31.Nm pthread_sigmask 32.Nd examine and/or change a thread's signal mask 33.Sh LIBRARY 34.Lb libpthread 35.Sh SYNOPSIS 36.In pthread.h 37.In signal.h 38.Ft int 39.Fn pthread_sigmask "int how" "const sigset_t * restrict set" \ 40 "sigset_t * restrict oset" 41.Sh DESCRIPTION 42The 43.Fn pthread_sigmask 44function examines and/or changes the calling thread's signal mask. 45.Pp 46If 47.Fa set 48is not 49.Dv NULL , 50it specifies a set of signals to be modified, and 51.Fa how 52specifies what to set the signal mask to: 53.Bl -tag -width SIG_UNBLOCK 54.It Dv SIG_BLOCK 55Union of the current mask and 56.Fa set . 57.It Dv SIG_UNBLOCK 58Intersection of the current mask and the complement of 59.Fa set . 60.It Dv SIG_SETMASK 61.Fa set . 62.El 63.Pp 64If 65.Fa oset 66is not NULL, the previous signal mask is stored in the location pointed to by 67.Fa oset . 68.Pp 69.Dv SIGKILL 70and 71.Dv SIGSTOP 72cannot be blocked, and will be silently ignored if included in the signal mask. 73.Sh RETURN VALUES 74If successful, 75.Fn pthread_sigmask 76returns 0. 77Otherwise, an error is returned. 78.Sh ERRORS 79The 80.Fn pthread_sigmask 81function will fail if: 82.Bl -tag -width Er 83.It Bq Er EINVAL 84.Fa how 85is not one of the defined values. 86.El 87.Sh SEE ALSO 88.Xr sigaction 2 , 89.Xr sigpending 2 , 90.Xr sigprocmask 2 , 91.Xr sigsuspend 2 , 92.Xr sigsetops 3 93.Sh STANDARDS 94The 95.Fn pthread_sigmask 96function conforms to 97.St -p1003.1-96 98