sigblock(3-BSD)   MISC. REFERENCE MANUAL PAGES    sigblock(3-BSD)



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  Refer-
     ence Manual.























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