1
2/*--------------------------------------------------------------------*/
3/*--- Signal-related libc stuff.             pub_core_libcsignal.h ---*/
4/*--------------------------------------------------------------------*/
5
6/*
7   This file is part of Valgrind, a dynamic binary instrumentation
8   framework.
9
10   Copyright (C) 2000-2010 Julian Seward
11      jseward@acm.org
12
13   This program is free software; you can redistribute it and/or
14   modify it under the terms of the GNU General Public License as
15   published by the Free Software Foundation; either version 2 of the
16   License, or (at your option) any later version.
17
18   This program is distributed in the hope that it will be useful, but
19   WITHOUT ANY WARRANTY; without even the implied warranty of
20   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21   General Public License for more details.
22
23   You should have received a copy of the GNU General Public License
24   along with this program; if not, write to the Free Software
25   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26   02111-1307, USA.
27
28   The GNU General Public License is contained in the file COPYING.
29*/
30
31#ifndef __PUB_CORE_LIBCSIGNAL_H
32#define __PUB_CORE_LIBCSIGNAL_H
33
34//--------------------------------------------------------------------
35// PURPOSE: This module contains all the libc code related to signals.
36//--------------------------------------------------------------------
37
38#include "pub_tool_libcsignal.h"
39
40/* Note that these use the vki_ (kernel) structure
41   definitions, which are different in places from those that glibc
42   defines.  Since we're operating right at the kernel interface, glibc's view
43   of the world is entirely irrelevant. */
44
45/* --- Signal set ops --- */
46extern Int  VG_(sigfillset)  ( vki_sigset_t* set );
47extern Int  VG_(sigemptyset) ( vki_sigset_t* set );
48
49extern Bool VG_(isfullsigset)  ( const vki_sigset_t* set );
50extern Bool VG_(isemptysigset) ( const vki_sigset_t* set );
51extern Bool VG_(iseqsigset)    ( const vki_sigset_t* set1,
52                                 const vki_sigset_t* set2 );
53
54extern Int  VG_(sigaddset)   ( vki_sigset_t* set, Int signum );
55extern Int  VG_(sigdelset)   ( vki_sigset_t* set, Int signum );
56extern Int  VG_(sigismember) ( const vki_sigset_t* set, Int signum );
57
58extern void VG_(sigaddset_from_set) ( vki_sigset_t* dst, vki_sigset_t* src );
59extern void VG_(sigdelset_from_set) ( vki_sigset_t* dst, vki_sigset_t* src );
60extern void VG_(sigintersectset)    ( vki_sigset_t* dst, vki_sigset_t* src );
61extern void VG_(sigcomplementset)   ( vki_sigset_t* dst, vki_sigset_t* src );
62
63/* --- Mess with the kernel's sig state --- */
64/* VG_(sigprocmask) is in pub_tool_libcsignal.h. */
65
66extern Int VG_(sigaction)   ( Int signum,
67                              const vki_sigaction_toK_t* act,
68                              vki_sigaction_fromK_t* oldact );
69
70/* Convert a sigaction which you got from the kernel (a _fromK_t) to
71   one which you can give back to the kernel (a _toK_t).  On Linux and
72   AIX, vki_sigaction_{toK,fromK}_t are identical, so this is a no-op
73   (structure copy), but on Darwin it's not a no-op. */
74extern void VG_(convert_sigaction_fromK_to_toK)(
75               vki_sigaction_fromK_t*, /*OUT*/vki_sigaction_toK_t*);
76
77
78extern Int VG_(kill)        ( Int pid, Int signo );
79extern Int VG_(tkill)       ( Int lwpid, Int signo );
80
81/* A cut-down version of POSIX sigtimedwait: poll for pending signals
82   mentioned in the sigset_t, and if any are present, select one
83   arbitrarily, return its number (which must be > 0), and put
84   auxiliary info about it in the siginfo_t, and make it
85   not-pending-any-more.  If none are pending, return zero.  The _zero
86   refers to the fact that there is zero timeout, so if no signals are
87   pending it returns immediately.  Perhaps a better name would be
88   'sigpoll'.  Returns -1 on error, 0 if no signals pending, and n > 0
89   if signal n was selected. */
90extern Int VG_(sigtimedwait_zero)( const vki_sigset_t *, vki_siginfo_t * );
91
92#endif   // __PUB_CORE_LIBCSIGNAL_H
93
94/*--------------------------------------------------------------------*/
95/*--- end                                                          ---*/
96/*--------------------------------------------------------------------*/
97