.\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice(s), this list of conditions and the following disclaimer as .\" the first lines of this file unmodified other than the possible .\" addition of one or more copyright notices. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice(s), this list of conditions and the following disclaimer in .\" the documentation and/or other materials provided with the .\" distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY .\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR .\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE .\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR .\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, .\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE .\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, .\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .\" $FreeBSD: src/lib/libc_r/man/pthread_sigmask.3,v 1.9 2001/10/01 16:09:09 ru Exp $ .Dd April 27, 2000 .Dt PTHREAD_SIGMASK 2 .Os .Sh NAME .Nm pthread_sigmask .Nd examine and/or change a thread's signal mask .Sh SYNOPSIS .In pthread.h .In signal.h .Ft int .Fn pthread_sigmask "int how" "const sigset_t *set" "sigset_t *oset" .Sh DESCRIPTION The .Fn pthread_sigmask function examines and/or changes the calling thread's signal mask. .Pp If .Fa set is not .Dv NULL , it specifies a set of signals to be modified, and .Fa how specifies what to set the signal mask to: .Bl -tag -width SIG_UNBLOCK .It Dv SIG_BLOCK Union of the current mask and .Fa set . .It Dv SIG_UNBLOCK Intersection of the current mask and the complement of .Fa set . .It Dv SIG_SETMASK .Fa set . .El .Pp If .Fa oset is not NULL, the previous signal mask is stored in the location pointed to by .Fa oset . .Pp .Dv SIGKILL and .Dv SIGSTOP cannot be blocked, and will be silently ignored if included in the signal mask. .Sh RETURN VALUES If successful, .Fn pthread_sigmask returns 0. Otherwise, an error is returned. .Sh ERRORS .Fn pthread_sigmask will fail if: .Bl -tag -width Er .It Bq Er EINVAL .Fa how is not one of the defined values. .El .Sh SEE ALSO .Xr sigaction 2 , .Xr sigpending 2 , .Xr sigprocmask 2 , .Xr sigsuspend 2 , .Xr sigsetops 3 .Sh STANDARDS .Fn pthread_sigmask conforms to ISO/IEC 9945-1:1996 (``POSIX.1'')