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Man Pages
SIGPENDING(2) FreeBSD System Calls Manual SIGPENDING(2)

sigpending
get pending signals

Standard C Library (libc, -lc)

#include <signal.h>
int
sigpending(sigset_t *set);

The sigpending() system call returns a mask of the signals pending for delivery to the calling thread or 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 error.

The sigpending() system call will fail if:
[]
The set argument specified an invalid address.

sigaction(2), sigprocmask(2), sigsuspend(2), sigsetops(3)

The sigpending() system call is expected to conform to IEEE Std 1003.1-1990 (“POSIX.1”).
September 6, 2013 FreeBSD 12.0-RELEASE

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