sigpending - return set of signals pending for thread (POSIX)
int sigpending (sigset_t *maskptr);
sigpending returns the set of signals pending for the calling thread
(i.e., blocked from delivery) in the space pointed to by maskptr.
Routines described in sigsetops(3) are used to examine the returned
sigpending will fail if:
[EFAULT] maskptr points to memory that is not a part of process's
valid address space.
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigsetops(3).
A 0 value indicates that the call succeeded. A -1 return value indicates
an error occurred and errno is set to indicate the reason.
The POSIX and System V signal facilities have different semantics. Using
both facilities in the same program is strongly discouraged and will
result in unpredictable behavior.
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