sigblock(3)            C LIBRARY FUNCTIONS            sigblock(3)



NAME
     sigblock, sigmask - block signals

SYNOPSIS
     cc [ flag... ] file ... -lucb #include <signal.h>
     sigblock(mask);
     int mask;
     #define sigmask(signum)

DESCRIPTION
     sigblock adds the signals specified in mask to  the  set  of
     signals  currently being blocked from delivery.  Signals are
     blocked if the appropriate bit in mask is  a  1;  the  macro
     sigmask  is  provided to construct the mask for a given sig-
     num.  The previous mask is returned,  and  may  be  restored
     using  sigsetmask(3).   It is not possible to block SIGKILL,
     SIGSTOP, or SIGCONT; this restriction is silently imposed by
     the system.

RETURN VALUE
     The previous set of masked signals is returned.

SEE ALSO
     sigsetmask(2), sigvec(2) kill(2), sigaction(2), signal(2) in
     the Programmer's Reference Manual.






























             Last change: BSD Compatibility Package             1