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sigpending — get pending signals
Standard C Library (libc, -lc)
The sigpending() system call returns a mask of the signals pending for
delivery to the calling process in the location indicated by set.
Signals may be pending because they are currently masked, or transiently
before delivery (although the latter case is not normally detectable).
The sigpending() function returns the value 0 if successful; otherwise
the value -1 is returned and the global variable errno is set to indicate
The sigpending() system call will fail if:
[EFAULT] The set argument specified an invalid address.
sigaction(2), sigprocmask(2), sigsuspend(2), sigsetops(3)
The sigpending() system call is expected to conform to ISO/IEC