
/*--------------------------------------------------------------------*/
/*--- Signal-related libc stuff.             pub_core_libcsignal.h ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of Valgrind, a dynamic binary instrumentation
   framework.

   Copyright (C) 2000-2017 Julian Seward
      jseward@acm.org

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.

   The GNU General Public License is contained in the file COPYING.
*/

#ifndef __PUB_CORE_LIBCSIGNAL_H
#define __PUB_CORE_LIBCSIGNAL_H

//--------------------------------------------------------------------
// PURPOSE: This module contains all the libc code related to signals.
//--------------------------------------------------------------------

#include "pub_tool_libcsignal.h"

/* Note that these use the vki_ (kernel) structure
   definitions, which are different in places from those that glibc
   defines.  Since we're operating right at the kernel interface, glibc's view
   of the world is entirely irrelevant. */

/* --- Signal set ops --- */
extern Int  VG_(sigfillset)  ( vki_sigset_t* set );
extern Int  VG_(sigemptyset) ( vki_sigset_t* set );

extern Bool VG_(isfullsigset)  ( const vki_sigset_t* set );
extern Bool VG_(isemptysigset) ( const vki_sigset_t* set );
extern Bool VG_(iseqsigset)    ( const vki_sigset_t* set1,
                                 const vki_sigset_t* set2 );

extern Int  VG_(sigaddset)   ( vki_sigset_t* set, Int signum );
/* VG_(sigdelset) is in pub_tool_libcsignal.h */
extern Int  VG_(sigismember) ( const vki_sigset_t* set, Int signum );

extern void VG_(sigaddset_from_set) ( vki_sigset_t* dst, const vki_sigset_t* src );
extern void VG_(sigdelset_from_set) ( vki_sigset_t* dst, const vki_sigset_t* src );
extern void VG_(sigintersectset)    ( vki_sigset_t* dst, const vki_sigset_t* src );
extern void VG_(sigcomplementset)   ( vki_sigset_t* dst, const vki_sigset_t* src );

/* --- Mess with the kernel's sig state --- */
/* VG_(sigprocmask) is in pub_tool_libcsignal.h. */

extern Int VG_(sigaction)   ( Int signum,
                              const vki_sigaction_toK_t* act,
                              vki_sigaction_fromK_t* oldact );

/* Convert a sigaction which you got from the kernel (a _fromK_t) to
   one which you can give back to the kernel (a _toK_t).  On Linux,
   vki_sigaction_{toK,fromK}_t are identical, so this is a no-op
   (structure copy), but on Darwin it's not a no-op. */
extern void VG_(convert_sigaction_fromK_to_toK)(
                const vki_sigaction_fromK_t*, /*OUT*/vki_sigaction_toK_t*);


extern Int VG_(kill)        ( Int pid, Int signo );
extern Int VG_(tkill)       ( Int lwpid, Int signo );

/* A cut-down version of POSIX sigtimedwait: poll for pending signals
   mentioned in the sigset_t, and if any are present, select one
   arbitrarily, return its number (which must be > 0), and put
   auxiliary info about it in the siginfo_t, and make it
   not-pending-any-more.  If none are pending, return zero.  The _zero
   refers to the fact that there is zero timeout, so if no signals are
   pending it returns immediately.  Perhaps a better name would be
   'sigpoll'.  Returns -1 on error, 0 if no signals pending, and n > 0
   if signal n was selected. */
extern Int VG_(sigtimedwait_zero)( const vki_sigset_t *, vki_siginfo_t * );

#endif   // __PUB_CORE_LIBCSIGNAL_H

/*--------------------------------------------------------------------*/
/*--- end                                                          ---*/
/*--------------------------------------------------------------------*/
