\" $NetBSD: pthread_sigmask.3,v 1.9 2010/07/09 10:55:11 wiz Exp $
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\" $FreeBSD: src/lib/libpthread/man/pthread_sigmask.3,v 1.10 2002/09/16 19:29:29 mini Exp $
Dd July 9, 2010
Dt PTHREAD_SIGMASK 3
Os
Sh NAME
Nm pthread_sigmask
Nd examine and/or change a thread's signal mask
Sh LIBRARY
Lb libpthread
Sh SYNOPSIS
\" .In pthread.h
In signal.h
Ft int
Fn pthread_sigmask "int how" "const sigset_t * restrict set" "sigset_t * restrict 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
Dv 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
shall 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 sigwait 2 ,
Xr sigsetops 3
Sh STANDARDS
The function conforms to
St -p1003.1-2001 .

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