TO BE OBSOLETED
sigblock - block signals
long sigblock(long mask);
sigblock() causes the signals specified in mask to be added to the set
of signals currently being blocked from delivery. Signal i is blocked
if the i-th bit in mask is 1, as specified with the macro sigmask(i).
It is not possible to block signals that cannot be ignored, as
documented in signal(5); this restriction is silently imposed by the
Use sigsetmask() to set the mask absolutely (see sigsetmask(2)).
sigblock() returns the previous set of masked signals.
The following call to sigblock() adds the SIGUSR1 and SIGUSR2 signals
to the mask of signals currently blocked for the process:
oldmask = sigblock (sigmask (SIGUSR1) | sigmask (SIGUSR2));
Do not use sigblock() in conjunction with the facilities described
sigblock() is to be obsoleted at a future date.
Since each thread maintains its own blocked signal mask, sigblock()
modifies only the calling thread's blocked signal mask.
For more information regarding signals and threads, refer to
sigblock() accepts and returns long (64 bit) values. However, as for
ILP32 programs, sigblock() supports signals numbered 1 through 32.
The upper 32 bits of the mask argument are ignored. Also, the upper
32 bits of the returned mask have no meaning.
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
TO BE OBSOLETED
sigblock() was developed by the University of California, Berkeley.
kill(2), sigprocmask(2), sigsetmask(2), sigvector(2), signal(5).
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000