DragonFly On-Line Manual Pages


SIGBLOCK(2)		 DragonFly System Calls Manual		   SIGBLOCK(2)

NAME

sigblock -- block signals

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <signal.h> int sigblock(int mask); int sigmask(signum);

DESCRIPTION

This interface is made obsolete by sigprocmask(2). Sigblock() adds the signals specified in mask to the set of signals cur- rently being blocked from delivery. Signals are blocked if the corre- sponding bit in mask is a 1; the macro sigmask() is provided to construct the mask for a given signum. It is not possible to block SIGKILL or SIGSTOP; this restriction is silently imposed by the system.

RETURN VALUES

The previous set of masked signals is returned.

SEE ALSO

kill(2), sigaction(2), sigprocmask(2), sigsetmask(2), sigsetops(3)

HISTORY

The sigblock() function call appeared in 4.2BSD and has been deprecated. DragonFly 3.7 June 2, 1993 DragonFly 3.7