NAME

       sigsetmask, sigblock — manipulate current signal mask

LIBRARY

       Standard C Library (libc, -lc)

SYNOPSIS

       #include <signal.h>

       int
       sigsetmask(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.

Debian                                            June 2, 1993                                     SIGSETMASK(2)