|| FreeBSD System Calls Manual
get pending signals
Standard C Library (libc, -lc)
#include < signal.h>
sigpending( sigset_t *set);
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 indicate the error.
() system call will fail if:
set argument specified an invalid address.
sigpending() system call is expected to conform to IEEE Std 1003.1-1990 (“POSIX.1”).