gnulib: lib/c-stack.c annotate

annotate lib/c-stack.c @ 40057:b06060465f09

maint: Run 'make update-copyright'

author	Paul Eggert <eggert@cs.ucla.edu>
date	Tue, 01 Jan 2019 00:25:11 +0100
parents	791f51373ba1
children

rev	line source
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	1 /* Stack overflow handling.
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	2
40057 b06060465f09 maint: Run 'make update-copyright' Paul Eggert <eggert@cs.ucla.edu> parents: 19579 diff changeset	3 Copyright (C) 2002, 2004, 2006, 2008-2019 Free Software Foundation, Inc.
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	4
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 7302 diff changeset	5 This program is free software: you can redistribute it and/or modify
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	6 it under the terms of the GNU General Public License as published by
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 7302 diff changeset	7 the Free Software Foundation; either version 3 of the License, or
bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 7302 diff changeset	8 (at your option) any later version.
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	9
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	10 This program is distributed in the hope that it will be useful,
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	13 GNU General Public License for more details.
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	14
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	15 You should have received a copy of the GNU General Public License
19190 9759915b2aca all: prefer https: URLs Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	17
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	18 /* Written by Paul Eggert. */
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	19
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	20 /* NOTES:
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	21
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	22 A program that uses alloca, dynamic arrays, or large local
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	23 variables may extend the stack by more than a page at a time. If
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	24 so, when the stack overflows the operating system may not detect
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	25 the overflow until the program uses the array, and this module may
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	26 incorrectly report a program error instead of a stack overflow.
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	27
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	28 To avoid this problem, allocate only small objects on the stack; a
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	29 program should be OK if it limits single allocations to a page or
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	30 less. Allocate larger arrays in static storage, or on the heap
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	31 (e.g., with malloc). Yes, this is a pain, but we don't know of any
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	32 better solution that is portable.
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	33
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	34 No attempt has been made to deal with multithreaded applications. */
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	35
7302 8a1a9361108c * _fpending.c: Include <config.h> unconditionally, since we no Paul Eggert <eggert@cs.ucla.edu> parents: 6689 diff changeset	36 #include <config.h>
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	37
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	38 #ifndef __attribute__
9613 c4fa39bf5223 Don't redefine __attribute__ without a need. Bruno Haible <bruno@clisp.org> parents: 9309 diff changeset	39 # if __GNUC__ < 3
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	40 # define __attribute__(x)
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	41 # endif
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	42 #endif
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	43
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	44 #include "gettext.h"
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	45 #define _(msgid) gettext (msgid)
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	46
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	47 #include <errno.h>
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	48
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	49 #include <signal.h>
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	50 #if ! HAVE_STACK_T && ! defined stack_t
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	51 typedef struct sigaltstack stack_t;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	52 #endif
10276 adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	53 #ifndef SIGSTKSZ
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	54 # define SIGSTKSZ 16384
13818 7d63d145c370 c-stack: work around libsigsegv 2.8 bug Eric Blake <eblake@redhat.com> parents: 12559 diff changeset	55 #elif HAVE_LIBSIGSEGV && SIGSTKSZ < 16384
7d63d145c370 c-stack: work around libsigsegv 2.8 bug Eric Blake <eblake@redhat.com> parents: 12559 diff changeset	56 /* libsigsegv 2.6 through 2.8 have a bug where some architectures use
7d63d145c370 c-stack: work around libsigsegv 2.8 bug Eric Blake <eblake@redhat.com> parents: 12559 diff changeset	57 more than the Linux default of an 8k alternate stack when deciding
7d63d145c370 c-stack: work around libsigsegv 2.8 bug Eric Blake <eblake@redhat.com> parents: 12559 diff changeset	58 if a fault was caused by stack overflow. */
7d63d145c370 c-stack: work around libsigsegv 2.8 bug Eric Blake <eblake@redhat.com> parents: 12559 diff changeset	59 # undef SIGSTKSZ
7d63d145c370 c-stack: work around libsigsegv 2.8 bug Eric Blake <eblake@redhat.com> parents: 12559 diff changeset	60 # define SIGSTKSZ 16384
10276 adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	61 #endif
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	62
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	63 #include <stdlib.h>
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	64 #include <string.h>
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	65
10214 6fcac230dda4 Simplify c-stack prerequisites. Eric Blake <ebb9@byu.net> parents: 10213 diff changeset	66 /* Posix 2001 declares ucontext_t in <ucontext.h>, Posix 200x in
6fcac230dda4 Simplify c-stack prerequisites. Eric Blake <ebb9@byu.net> parents: 10213 diff changeset	67 <signal.h>. */
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	68 #if HAVE_UCONTEXT_H
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	69 # include <ucontext.h>
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	70 #endif
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	71
6689 93d578c7aa44 * lib/c-stack.c: Include unistd.h unconditionally, since we now assume Paul Eggert <eggert@cs.ucla.edu> parents: 6259 diff changeset	72 #include <unistd.h>
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	73
10276 adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	74 #if HAVE_LIBSIGSEGV
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	75 # include <sigsegv.h>
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	76 #endif
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	77
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	78 #include "c-stack.h"
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	79 #include "exitfail.h"
12333 d904c3a8f14c c-stack: avoid "ignoring return value of `write'" warning Jim Meyering <meyering@redhat.com> parents: 11941 diff changeset	80 #include "ignore-value.h"
18397 dbcfb44c9695 Port modules to use getprogname explicitly Pino Toscano <ptoscano@redhat.com> parents: 18189 diff changeset	81 #include "getprogname.h"
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	82
10230 54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	83 #if defined SA_ONSTACK && defined SA_SIGINFO
14184 3cb76305b3e9 c-stack: assume stack overflow if SA_SIGINFO unsupported Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	84 # define SIGINFO_WORKS 1
4969 0db24850c598 Fix c-stack.c portability bug on IRIX 5.3. Paul Eggert <eggert@cs.ucla.edu> parents: 4915 diff changeset	85 #else
14184 3cb76305b3e9 c-stack: assume stack overflow if SA_SIGINFO unsupported Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	86 # define SIGINFO_WORKS 0
10960 a412de948252 Make c-stack work on Haiku. Ingo Weinhold <ingo_weinhold@gmx.de> parents: 10851 diff changeset	87 # ifndef SA_ONSTACK
a412de948252 Make c-stack work on Haiku. Ingo Weinhold <ingo_weinhold@gmx.de> parents: 10851 diff changeset	88 # define SA_ONSTACK 0
a412de948252 Make c-stack work on Haiku. Ingo Weinhold <ingo_weinhold@gmx.de> parents: 10851 diff changeset	89 # endif
4969 0db24850c598 Fix c-stack.c portability bug on IRIX 5.3. Paul Eggert <eggert@cs.ucla.edu> parents: 4915 diff changeset	90 #endif
0db24850c598 Fix c-stack.c portability bug on IRIX 5.3. Paul Eggert <eggert@cs.ucla.edu> parents: 4915 diff changeset	91
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	92 /* The user-specified action to take when a SEGV-related program error
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	93 or stack overflow occurs. */
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	94 static void (* volatile segv_action) (int);
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	95
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	96 /* Translated messages for program errors and stack overflow. Do not
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	97 translate them in the signal handler, since gettext is not
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	98 async-signal-safe. */
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	99 static char const * volatile program_error_message;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	100 static char const * volatile stack_overflow_message;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	101
19570 65e2d81e2034 c-stack: port to recent GCC build Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	102 #if ((HAVE_LIBSIGSEGV && ! HAVE_XSI_STACK_OVERFLOW_HEURISTIC) \
65e2d81e2034 c-stack: port to recent GCC build Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	103 \|\| (HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK \
19579 791f51373ba1 c-stack: Fix possible build failure on some platforms. Bruno Haible <bruno@clisp.org> parents: 19570 diff changeset	104 && HAVE_STACK_OVERFLOW_HANDLING))
19570 65e2d81e2034 c-stack: port to recent GCC build Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	105
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	106 /* Output an error message, then exit with status EXIT_FAILURE if it
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	107 appears to have been a stack overflow, or with a core dump
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	108 otherwise. This function is async-signal-safe. */
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	109
15399 75580bffd82c c-stack: use _Noreturn Paul Eggert <eggert@cs.ucla.edu> parents: 15303 diff changeset	110 static _Noreturn void
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	111 die (int signo)
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	112 {
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	113 char const *message;
14225 cda7d779145b c-stack: fix regression on cygwin when libsigsegv is present Eric Blake <eblake@redhat.com> parents: 14184 diff changeset	114 #if !SIGINFO_WORKS && !HAVE_LIBSIGSEGV
14184 3cb76305b3e9 c-stack: assume stack overflow if SA_SIGINFO unsupported Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	115 /* We can't easily determine whether it is a stack overflow; so
3cb76305b3e9 c-stack: assume stack overflow if SA_SIGINFO unsupported Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	116 assume that the rest of our program is perfect (!) and that
3cb76305b3e9 c-stack: assume stack overflow if SA_SIGINFO unsupported Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	117 this segmentation violation is a stack overflow. */
3cb76305b3e9 c-stack: assume stack overflow if SA_SIGINFO unsupported Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	118 signo = 0;
14225 cda7d779145b c-stack: fix regression on cygwin when libsigsegv is present Eric Blake <eblake@redhat.com> parents: 14184 diff changeset	119 #endif /* !SIGINFO_WORKS && !HAVE_LIBSIGSEGV */
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	120 segv_action (signo);
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	121 message = signo ? program_error_message : stack_overflow_message;
18397 dbcfb44c9695 Port modules to use getprogname explicitly Pino Toscano <ptoscano@redhat.com> parents: 18189 diff changeset	122 ignore_value (write (STDERR_FILENO, getprogname (), strlen (getprogname ())));
12333 d904c3a8f14c c-stack: avoid "ignoring return value of `write'" warning Jim Meyering <meyering@redhat.com> parents: 11941 diff changeset	123 ignore_value (write (STDERR_FILENO, ": ", 2));
d904c3a8f14c c-stack: avoid "ignoring return value of `write'" warning Jim Meyering <meyering@redhat.com> parents: 11941 diff changeset	124 ignore_value (write (STDERR_FILENO, message, strlen (message)));
d904c3a8f14c c-stack: avoid "ignoring return value of `write'" warning Jim Meyering <meyering@redhat.com> parents: 11941 diff changeset	125 ignore_value (write (STDERR_FILENO, "\n", 1));
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	126 if (! signo)
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	127 _exit (exit_failure);
10003 655ec8b9fbde Use 'raise'. Bruno Haible <bruno@clisp.org> parents: 9830 diff changeset	128 raise (signo);
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	129 abort ();
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	130 }
19570 65e2d81e2034 c-stack: port to recent GCC build Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	131 #endif
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	132
10358 37fd490ee38d c-stack: test that stack overflow can be caught Eric Blake <ebb9@byu.net> parents: 10279 diff changeset	133 #if (HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK \
37fd490ee38d c-stack: test that stack overflow can be caught Eric Blake <ebb9@byu.net> parents: 10279 diff changeset	134 && HAVE_STACK_OVERFLOW_HANDLING) \|\| HAVE_LIBSIGSEGV
10276 adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	135
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	136 /* Storage for the alternate signal stack. */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	137 static union
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	138 {
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	139 char buffer[SIGSTKSZ];
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	140
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	141 /* These other members are for proper alignment. There's no
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	142 standard way to guarantee stack alignment, but this seems enough
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	143 in practice. */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	144 long double ld;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	145 long l;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	146 void *p;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	147 } alternate_signal_stack;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	148
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	149 static void
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	150 null_action (int signo __attribute__ ((unused)))
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	151 {
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	152 }
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	153
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	154 #endif /* SIGALTSTACK \|\| LIBSIGSEGV */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	155
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	156 /* Only use libsigsegv if we need it; platforms like Solaris can
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	157 detect stack overflow without the overhead of an external
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	158 library. */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	159 #if HAVE_LIBSIGSEGV && ! HAVE_XSI_STACK_OVERFLOW_HEURISTIC
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	160
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	161 /* Nonzero if general segv handler could not be installed. */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	162 static volatile int segv_handler_missing;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	163
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	164 /* Handle a segmentation violation and exit if it cannot be stack
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	165 overflow. This function is async-signal-safe. */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	166
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	167 static int segv_handler (void *address __attribute__ ((unused)),
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	168 int serious)
10276 adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	169 {
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	170 # if DEBUG
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	171 {
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	172 char buf[1024];
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	173 sprintf (buf, "segv_handler serious=%d\n", serious);
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	174 write (STDERR_FILENO, buf, strlen (buf));
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	175 }
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	176 # endif
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	177
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	178 /* If this fault is not serious, return 0 to let the stack overflow
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	179 handler take a shot at it. */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	180 if (!serious)
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	181 return 0;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	182 die (SIGSEGV);
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	183 }
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	184
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	185 /* Handle a segmentation violation that is likely to be a stack
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	186 overflow and exit. This function is async-signal-safe. */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	187
15399 75580bffd82c c-stack: use _Noreturn Paul Eggert <eggert@cs.ucla.edu> parents: 15303 diff changeset	188 static _Noreturn void
10276 adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	189 overflow_handler (int emergency,
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	190 stackoverflow_context_t context __attribute__ ((unused)))
10276 adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	191 {
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	192 # if DEBUG
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	193 {
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	194 char buf[1024];
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	195 sprintf (buf, "overflow_handler emergency=%d segv_handler_missing=%d\n",
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	196 emergency, segv_handler_missing);
10276 adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	197 write (STDERR_FILENO, buf, strlen (buf));
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	198 }
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	199 # endif
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	200
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	201 die ((!emergency \|\| segv_handler_missing) ? 0 : SIGSEGV);
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	202 }
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	203
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	204 int
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	205 c_stack_action (void (*action) (int))
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	206 {
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	207 segv_action = action ? action : null_action;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	208 program_error_message = _("program error");
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	209 stack_overflow_message = _("stack overflow");
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	210
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	211 /* Always install the overflow handler. */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	212 if (stackoverflow_install_handler (overflow_handler,
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	213 alternate_signal_stack.buffer,
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	214 sizeof alternate_signal_stack.buffer))
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	215 {
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	216 errno = ENOTSUP;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	217 return -1;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	218 }
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	219 /* Try installing a general handler; if it fails, then treat all
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	220 segv as stack overflow. */
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	221 segv_handler_missing = sigsegv_install_handler (segv_handler);
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	222 return 0;
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	223 }
adfc5a204195 Make c-stack use libsigsegv, when available. Eric Blake <ebb9@byu.net> parents: 10230 diff changeset	224
10358 37fd490ee38d c-stack: test that stack overflow can be caught Eric Blake <ebb9@byu.net> parents: 10279 diff changeset	225 #elif HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK && HAVE_STACK_OVERFLOW_HANDLING
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	226
14184 3cb76305b3e9 c-stack: assume stack overflow if SA_SIGINFO unsupported Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	227 # if SIGINFO_WORKS
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	228
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	229 /* Handle a segmentation violation and exit. This function is
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	230 async-signal-safe. */
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	231
15399 75580bffd82c c-stack: use _Noreturn Paul Eggert <eggert@cs.ucla.edu> parents: 15303 diff changeset	232 static _Noreturn void
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	233 segv_handler (int signo, siginfo_t *info,
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	234 void *context __attribute__ ((unused)))
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	235 {
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	236 /* Clear SIGNO if it seems to have been a stack overflow. */
11077 ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	237 # if ! HAVE_XSI_STACK_OVERFLOW_HEURISTIC
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	238 /* We can't easily determine whether it is a stack overflow; so
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	239 assume that the rest of our program is perfect (!) and that
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	240 this segmentation violation is a stack overflow.
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	241
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	242 Note that although both Linux and Solaris provide
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	243 sigaltstack, SA_ONSTACK, and SA_SIGINFO, currently only
16358 a712776b11ce maint: spelling fixes Paul Eggert <eggert@cs.ucla.edu> parents: 16201 diff changeset	244 Solaris satisfies the XSI heuristic. This is because
11077 ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	245 Solaris populates uc_stack with the details of the
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	246 interrupted stack, while Linux populates it with the details
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	247 of the current stack. */
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	248 signo = 0;
ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	249 # else
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	250 if (0 < info->si_code)
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	251 {
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	252 /* If the faulting address is within the stack, or within one
15303 5fa23c9b72d6 c-stack: stop worrying about stack direction Paul Eggert <eggert@cs.ucla.edu> parents: 14225 diff changeset	253 page of the stack, assume that it is a stack overflow. */
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	254 ucontext_t const *user_context = context;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	255 char const *stack_base = user_context->uc_stack.ss_sp;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	256 size_t stack_size = user_context->uc_stack.ss_size;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	257 char const *faulting_address = info->si_addr;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	258 size_t page_size = sysconf (_SC_PAGESIZE);
15303 5fa23c9b72d6 c-stack: stop worrying about stack direction Paul Eggert <eggert@cs.ucla.edu> parents: 14225 diff changeset	259 size_t s = faulting_address - stack_base + page_size;
5fa23c9b72d6 c-stack: stop worrying about stack direction Paul Eggert <eggert@cs.ucla.edu> parents: 14225 diff changeset	260 if (s < stack_size + 2 * page_size)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	261 signo = 0;
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	262
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	263 # if DEBUG
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	264 {
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	265 char buf[1024];
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	266 sprintf (buf,
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	267 "segv_handler fault=%p base=%p size=%lx page=%lx signo=%d\n",
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	268 faulting_address, stack_base, (unsigned long) stack_size,
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	269 (unsigned long) page_size, signo);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	270 write (STDERR_FILENO, buf, strlen (buf));
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	271 }
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	272 # endif
11077 ddb65537c2d0 On HP-UX, don't pretend it was a SIGSEGV when it was a stack overflow. Bruno Haible <bruno@clisp.org> parents: 11049 diff changeset	273 }
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	274 # endif
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	275
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	276 die (signo);
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	277 }
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	278 # endif
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	279
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	280 int
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	281 c_stack_action (void (*action) (int))
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	282 {
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	283 int r;
7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	284 stack_t st;
10230 54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	285 struct sigaction act;
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	286 st.ss_flags = 0;
10470 9867f4fee019 c-stack: work around Irix sigaltstack bug Eric Blake <ebb9@byu.net> parents: 10358 diff changeset	287 # if SIGALTSTACK_SS_REVERSED
9867f4fee019 c-stack: work around Irix sigaltstack bug Eric Blake <ebb9@byu.net> parents: 10358 diff changeset	288 /* Irix mistakenly treats ss_sp as the upper bound, rather than
9867f4fee019 c-stack: work around Irix sigaltstack bug Eric Blake <ebb9@byu.net> parents: 10358 diff changeset	289 lower bound, of the alternate stack. */
9867f4fee019 c-stack: work around Irix sigaltstack bug Eric Blake <ebb9@byu.net> parents: 10358 diff changeset	290 st.ss_sp = alternate_signal_stack.buffer + SIGSTKSZ - sizeof (void *);
9867f4fee019 c-stack: work around Irix sigaltstack bug Eric Blake <ebb9@byu.net> parents: 10358 diff changeset	291 st.ss_size = sizeof alternate_signal_stack.buffer - sizeof (void *);
9867f4fee019 c-stack: work around Irix sigaltstack bug Eric Blake <ebb9@byu.net> parents: 10358 diff changeset	292 # else
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	293 st.ss_sp = alternate_signal_stack.buffer;
7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	294 st.ss_size = sizeof alternate_signal_stack.buffer;
10470 9867f4fee019 c-stack: work around Irix sigaltstack bug Eric Blake <ebb9@byu.net> parents: 10358 diff changeset	295 # endif
10230 54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	296 r = sigaltstack (&st, NULL);
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	297 if (r != 0)
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	298 return r;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	299
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	300 segv_action = action ? action : null_action;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	301 program_error_message = _("program error");
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	302 stack_overflow_message = _("stack overflow");
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	303
10230 54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	304 sigemptyset (&act.sa_mask);
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	305
14184 3cb76305b3e9 c-stack: assume stack overflow if SA_SIGINFO unsupported Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	306 # if SIGINFO_WORKS
10230 54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	307 /* POSIX 1003.1-2001 says SA_RESETHAND implies SA_NODEFER, but
54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	308 this is not true on Solaris 8 at least. It doesn't hurt to use
54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	309 SA_NODEFER here, so leave it in. */
54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	310 act.sa_flags = SA_NODEFER \| SA_ONSTACK \| SA_RESETHAND \| SA_SIGINFO;
54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	311 act.sa_sigaction = segv_handler;
54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	312 # else
10960 a412de948252 Make c-stack work on Haiku. Ingo Weinhold <ingo_weinhold@gmx.de> parents: 10851 diff changeset	313 act.sa_flags = SA_NODEFER \| SA_ONSTACK \| SA_RESETHAND;
10230 54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	314 act.sa_handler = die;
54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	315 # endif
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	316
10851 d31da80e6c50 Treat SIGBUS like SIFSEGV on platforms that need it. Bruno Haible <bruno@clisp.org> parents: 10470 diff changeset	317 # if FAULT_YIELDS_SIGBUS
d31da80e6c50 Treat SIGBUS like SIFSEGV on platforms that need it. Bruno Haible <bruno@clisp.org> parents: 10470 diff changeset	318 if (sigaction (SIGBUS, &act, NULL) < 0)
d31da80e6c50 Treat SIGBUS like SIFSEGV on platforms that need it. Bruno Haible <bruno@clisp.org> parents: 10470 diff changeset	319 return -1;
d31da80e6c50 Treat SIGBUS like SIFSEGV on platforms that need it. Bruno Haible <bruno@clisp.org> parents: 10470 diff changeset	320 # endif
10230 54813304edd2 Use sigaction module rather than signal(). Eric Blake <ebb9@byu.net> parents: 10214 diff changeset	321 return sigaction (SIGSEGV, &act, NULL);
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	322 }
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	323
10358 37fd490ee38d c-stack: test that stack overflow can be caught Eric Blake <ebb9@byu.net> parents: 10279 diff changeset	324 #else /* ! ((HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12335 diff changeset	325 && HAVE_STACK_OVERFLOW_HANDLING) \|\| HAVE_LIBSIGSEGV) */
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	326
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	327 int
4915 7994c15009db Merge from diffutils. Paul Eggert <eggert@cs.ucla.edu> parents: 3921 diff changeset	328 c_stack_action (void (*action) (int) __attribute__ ((unused)))
3902 f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	329 {
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	330 errno = ENOTSUP;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	331 return -1;
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	332 }
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	333
f26afed46772 New file, from diffutils-2.8.2. Jim Meyering <jim@meyering.net> parents: diff changeset	334 #endif

Mercurial > gnulib

annotate lib/c-stack.c @ 40057:b06060465f09