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man:rt_sigpending

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 and -1 on error.  In the event of an
     error, errno is set to indicate the cause.

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 sec-
     ond argument, size_t sigsetsize, which specifies the size in  bytes  of
     the  signal  set in set.  The glibc sigpending() wrapper function 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 signals is not correctly returned.

SEE ALSO

     kill(2), sigaction(2), signal(2), sigprocmask(2), sigsuspend(2), sigse-
     tops(3), signal(7)

COLOPHON

     This page is part of release 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.

Linux 2017-09-15 SIGPENDING(2)

/data/webs/external/dokuwiki/data/pages/man/rt_sigpending.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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