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SIGPENDING(2)                                                           Linux Programmer's Manual                                                          SIGPENDING(2)

NAME
       sigpending, rt_sigpending - examine pending signals

SYNOPSIS
       #include <signal.h>

       int sigpending(sigset_t *set);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sigpending():
           _POSIX_C_SOURCE

DESCRIPTION
       sigpending()  returns  the set of signals that are pending for delivery to the calling thread (i.e., the signals which have been raised while blocked).  The mask
       of pending signals is returned in set.

RETURN VALUE
       sigpending() returns 0 on success.  On failure, -1 is returned and errno is set to indicate the error.

ERRORS
       EFAULT set points to memory which is not a valid part of the process address space.

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

NOTES
       See sigsetops(3) for details on manipulating signal sets.

       If a signal is both blocked and has a disposition of "ignored", it is not added to the mask of pending signals when generated.

       The set of signals that is pending for a thread is the union of the set of signals that is pending for that thread and the set of signals that is pending for the
       process as a whole; see signal(7).

       A child created via fork(2) initially has an empty pending signal set; the pending signal set is preserved across an execve(2).

   C library/kernel differences
       The  original  Linux  system call was named sigpending().  However, with the addition of real-time signals in Linux 2.2, the fixed-size, 32-bit sigset_t argument
       supported by that system call was no longer fit for purpose.  Consequently, a new system call, rt_sigpending(), was added to support an enlarged  sigset_t  type.
       The new system call takes a second argument, size_t sigsetsize, which specifies the size in bytes of the signal set in set.  The glibc sigpending() wrapper func‐
       tion hides these details from us, transparently calling rt_sigpending() when the kernel provides it.

BUGS
       In versions of glibc up to and including 2.2.1, there is a bug in the wrapper function for sigpending() which means that information about pending real-time sig‐
       nals is not correctly returned.

SEE ALSO
       kill(2), sigaction(2), signal(2), sigprocmask(2), sigsuspend(2), sigsetops(3), signal(7)

Linux                                                                          2021-03-22                                                                  SIGPENDING(2)