Psigblock(2)              Oct. 1, 1991               Psigblock(2)



NAME
     Psigblock, Psigsetmask - block or unblock delivery  of  sig-
     nals

SYNOPSIS
     LONG Psigblock( LONG mask );
     LONG Psigsetmask( LONG mask );

DESCRIPTION
     Psigblock adds the set of signals defined  by  the  variable
     mask  to the set of signals which are blocked from delivery.
     Each bit of mask represents a signal; if bit n  of  mask  is
     set, then signal number n is blocked.  Psigblock returns the
     set of blocked signals as it was prior to  the  new  signals
     being added to it; the old set can thus be restored with the
     Psigsetmask call.

     Psigsetmask replaces the set of blocked signals with the set
     in  mask;  the bits of mask have the same meaning as they do
     for Psigblock, except that bits that are set to 0 will cause
     the corresponding signals to no longer be blocked.  Psigset-
     mask returns the old set of blocked signals.

     Note that certain signals (e.g. SIGKILL) cannot be  blocked,
     and  the kernel will (silently) clear the corresponding bits
     in mask before changing the blocked signal set.

     Blocked signals  remain  blocked  across  Pfork  and  Pvfork
     calls.  After  a  Pexec  call, the child process will always
     start with an empty set of blocked  signals,  regardless  of
     which signals were blocked by the parent.

SEE ALSO
     Pkill(2), Psignal(2), Psigpending(2)





















Version 0.9   Last change: MiNT Programmer's Manual             1