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sigblock(3B)
block signals
From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
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 signum. 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.