SIGBLOCK(2) BSD System Calls Manual SIGBLOCK(2)

NAME
     ssiiggbblloocckk - block signals

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

     int
     ssiiggbblloocckk(int mask);

     int
     ssiiggmmaasskk(signum);

DESCRIPTION
     TThhiiss iinntteerrffaaccee iiss mmaaddee oobbssoolleettee bbyy sigprocmask(22)..

     SSiiggbblloocckk() adds the signals specified in mask to the set of signals cur-
     rently being blocked from delivery.  Signals are blocked if the corre-
     sponding bit in mask is a 1; the macro ssiiggmmaasskk() is provided to construct
     the mask for a given signum.

     It is not possible to block SIGKILL or SIGSTOP; this restriction is
     silently imposed by the system.

RETURN VALUES
     The previous set of masked signals is returned.

SEE ALSO
     kill(2), sigaction(2), sigprocmask(2), sigsetmask(2), sigsetops(3)

HISTORY     The ssiiggbblloocckk() function call appeared in 4.2BSD and has been deprecated.

BSD                              June 2, 1993                              BSD