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SIGBLOCK (2) | System calls | Unix Manual Pages | :man

NAME

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

CONTENTS

Synopsis
Description
Notes

SYNOPSIS

#include <signal.h>

"int sigblock(int "mask);

int siggetmask(void);

"int sigsetmask(int "mask);

"int sigmask(int "signum);

DESCRIPTION

This interface is made obsolete by sigprocmask(2).

The sigblock system call adds the signals specified in mask to the set of signals currently being blocked from delivery.

The sigsetmask system call 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 current set of blocked signals can be obtained using siggetmask.

The sigmask macro is provided to construct the mask for a given signum.

"RETURN VALUE"

siggetmask returns the current set of masked signals.

sigsetmask and sigblock return the previous set of masked signals.

NOTES

Prototypes for these functions are only available if _BSD_SOURCE is defined before the inclusion of any system header file.

It is not possible to block SIGKILL or SIGSTOP - this restriction is silently imposed by the system.

"CONFORMING TO"

4.4BSD. These function calls appeared in BSD 4.3 and are deprecated. Use the POSIX signal facilities for new programs.

"SEE ALSO"

kill(2), sigprocmask(2), signal(7)


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