|SIGPROCMASK(2)||System Calls Manual||SIGPROCMASK(2)|
manipulate current signal mask
how, const sigset_t
sigprocmask() function examines and/or
changes the current signal mask (those signals that are blocked from
delivery). Signals are blocked if they are members of the current signal
If set is not null, the action of
sigprocmask() depends on the value of the parameter
how, which can be one of the following values:
If oset is not null, it is set to the previous value of the signal mask. When set is null, the value of how is insignificant and the mask remains unchanged, providing a way to examine the signal mask without modification.
The system quietly disallows
SIGSTOP to be blocked.
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
sigprocmask() call will fail and the
signal mask will be unchanged if one of the following occurs:
sigprocmask() function call is
expected to conform to IEEE Std 1003.1-2008
|December 14, 2014||OpenBSD-6.1|