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SIGSETMASK(2) | System Calls Manual | SIGSETMASK(2) |
NAME¶
sigsetmask, sigblock — manipulate current signal maskLIBRARY¶
Standard C Library (libc, -lc)SYNOPSIS¶
#include <signal.h> intsigsetmask(int mask); int
sigblock(int mask); int
sigmask(int signum);
DESCRIPTION¶
This interface is
made obsolete by:
sigprocmask(2).
The sigsetmask() function sets the current signal mask to the
specified mask. Signals are blocked from delivery if the
corresponding bit in mask is a 1. The
sigblock() function adds the signals in the specified
mask to the current signal mask, rather than overwriting
it as sigsetmask() does. The macro
sigmask() is provided to construct the mask for a given
signum.
The system quietly disallows SIGKILL
or
SIGSTOP
to be blocked.
RETURN VALUES¶
The sigblock() and sigsetmask() functions return the previous set of masked signals.SEE ALSO¶
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigvec(2), sigsetops(3)HISTORY¶
The sigsetmask() and sigblock() functions first appeared in 4.2BSD and have been deprecated.June 2, 1993 | Debian |