sigmask(2) -- Linux man page
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(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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