SIGBLOCK(2)

NAME
sigblock, siggetmask, sigsetmask, sigmask - manipulate the signal mask

SYNOPSIS
#include <signal.h>

int sigblock(int mask);
int siggetmask(void);
int sigsetmask(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. sigsetmask() replaces the set of blocked signals totally with a new set specified in mask. 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. The current set of blocked signals can be obtained using siggetmask().

RETURN VALUES
Siggetmask() returns the current set of masked signals. Sigsetmask() and sigblock() return the previous set of masked signals.

HISTORY
These function calls appeared in BSD 4.3 and have been deprecated.

SEE ALSO
kill(2), sigprocmask(2), siggetops(3)