|SIGPROCMASK(2)||Linux Programmer's Manual||SIGPROCMASK(2)|
NAME¶sigprocmask - examine and change blocked signals
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTION¶sigprocmask() is used to fetch and/or change the signal mask of the calling thread. The signal mask is the set of signals whose delivery is currently blocked for the caller (see also signal(7) for more details).
- The set of blocked signals is the union of the current set and the set argument.
- The signals in set are removed from the current set of blocked signals. It is permissible to attempt to unblock a signal which is not blocked.
- The set of blocked signals is set to the argument set.
RETURN VALUE¶sigprocmask() returns 0 on success and -1 on error. In the event of an error, errno is set to indicate the cause.
- the set or oldset argument points outside the process's allocated address space.
- The value specified in how was invalid.
NOTES¶It is not possible to block SIGKILL or SIGSTOP. Attempts to do so are silently ignored.
SEE ALSO¶kill(2), pause(2), sigaction(2), signal(2), sigpending(2), sigsuspend(2), pthread_sigmask(3), sigqueue(3), sigsetops(3), signal(7)
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