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from: @(#)sigsetmask.2 8.1 (Berkeley) 6/2/93
$NetBSD: sigsetmask.3,v 1.19 2013/05/06 13:29:12 wiz Exp $
.Dd August 10, 2002 .Dt SIGSETMASK 3 .Os .Sh NAME .Nm sigsetmask .Nd set current signal mask .Sh LIBRARY .Lb libc .Sh SYNOPSIS n signal.h .Ft int .Fn sigsetmask "int mask" .Fn sigmask signum .Sh DESCRIPTION f -symbolic This interface is made obsolete by: .Ef .Xr sigprocmask 2 .
p .Fn sigsetmask sets the current signal mask. Signals are blocked from delivery if the corresponding bit in .Fa mask is a 1; the macro .Fn sigmask is provided to construct the mask for a given .Fa signum .
p The system quietly disallows .Dv SIGKILL or .Dv SIGSTOP to be blocked. .Sh RETURN VALUES The previous set of masked signals is returned. .Sh EXAMPLES The following example using .Fn sigsetmask : d -literal -offset indent int omask; omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP)); ... sigsetmask(omask & ~(sigmask(SIGINT) | sigmask(SIGHUP))); .Ed
p Could be converted literally to: d -literal -offset indent sigset_t set, oset; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, &oset); ... sigdelset(&oset, SIGINT); sigdelset(&oset, SIGHUP); sigprocmask(SIG_SETMASK, &oset, NULL); .Ed
p Another, clearer, alternative is: d -literal -offset indent sigset_t set; sigemptyset(&set); sigaddset(&set, SIGINT); sigaddset(&set, SIGHUP); sigprocmask(SIG_BLOCK, &set, NULL); ... sigprocmask(SIG_UNBLOCK, &set, NULL); .Ed
p To completely clear the signal mask using .Fn sigsetmask one can do: d -literal -offset indent (void) sigsetmask(0); .Ed
p Which can be expressed via .Xr sigprocmask 2 as: d -literal -offset indent sigset_t eset; sigemptyset(&eset); (void) sigprocmask(SIG_SETMASK, &eset, NULL); .Ed .Sh SEE ALSO .Xr kill 2 , .Xr sigaction 2 , .Xr sigprocmask 2 , .Xr sigsuspend 2 , .Xr sigblock 3 , .Xr sigsetops 3 , .Xr sigvec 3 .Sh HISTORY The .Fn sigsetmask function call appeared in x 4.2 and has been deprecated.
Indexes created Sat Sep 20 22:09:52 GMT 2025