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FreeBSD 11.0 - man page for sigpending (freebsd section 2)

SIGPENDING(2)						      BSD System Calls Manual						     SIGPENDING(2)

NAME
sigpending -- get pending signals
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <signal.h> int sigpending(sigset_t *set);
DESCRIPTION
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).
RETURN VALUES
The sigpending() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi- cate the error.
ERRORS
The sigpending() system call will fail if: [EFAULT] The set argument specified an invalid address.
SEE ALSO
sigaction(2), sigprocmask(2), sigsuspend(2), sigsetops(3)
STANDARDS
The sigpending() system call is expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1'').
BSD
September 6, 2013 BSD