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 currently being blocked from delivery. Signals are blocked if the corresponding 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.

Table of Contents

• Name
• Library
• Synopsis
• Description
• Return Values
• See Also
• History