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sigprocmask() - Unix, Linux System Call
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NAME
sigprocmask - examine and change blocked signals
SYNOPSIS
#include <signal.h>
int sigprocmask(int how, const sigset_t *set, sigset_t *oldset); DESCRIPTION
sigprocmask() is used to change the signal mask, the set of currently blocked signals.
The behaviour of the call is dependent on the value of
how, as follows.
Tag | Description |
SIG_BLOCK | |
The set of blocked signals is the union of the current set and the
set argument.
|
SIG_UNBLOCK | |
The signals in
set are removed from the current set of blocked signals. It is legal to
attempt to unblock a signal which is not blocked.
|
SIG_SETMASK | |
The set of blocked signals is set to the argument
set. |
If
oldset is non-null, the previous value of the signal mask is stored in
oldset.
If
set is NULL, then the signal mask is unchanged (i.e.,
how is ignored),
but the current value of the signal mask is nevertheless returned in
oldset (it is not NULL).
The use of
sigprocmask() is unspecified in a multithreaded process; see
pthread_sigmask(3).
RETURN VALUE
sigprocmask() returns 0 on success and -1 on error.
ERRORS
EINVAL The value specified in
how was invalid.
NOTES
It is not possible to block
SIGKILL or SIGSTOP. Attempts to do so are silently ignored.
If
SIGBUS, SIGFPE, SIGILL, or
SIGSEGV are generated
while they are blocked, the result is undefined,
unless the signal was generated by the
kill(2),
sigqueue(2),
or
raise(3).
See
sigsetops(3)
for details on manipulating signal sets.
CONFORMING TO
POSIX.1-2001.
SEE ALSO
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