Mercurial > hg > octave-lojdl > gnulib-hg

annotate lib/c-stack.c @ 3921:181064782c71

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Include sys/time.h. From Volker Borchert.
author Jim Meyering <jim@meyering.net>
date Mon, 01 Jul 2002 14:19:20 +0000
parents 2f34e0925fe3
children 7994c15009db
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rev   line source
3902
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1 /* Stack overflow handling.
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2
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3 Copyright (C) 2002 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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18
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19 /* Written by Paul Eggert. */
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20
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21 /* NOTES:
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22
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23 A program that uses alloca, dynamic arrays, or large local
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24 variables may extend the stack by more than a page at a time. If
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25 so, when the stack overflows the operating system may not detect
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26 the overflow until the program uses the array, and this module may
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27 incorrectly report a program error instead of a stack overflow.
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28
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29 To avoid this problem, allocate only small objects on the stack; a
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30 program should be OK if it limits single allocations to a page or
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31 less. Allocate larger arrays in static storage, or on the heap
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32 (e.g., with malloc). Yes, this is a pain, but we don't know of any
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33 better solution that is portable.
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34
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35 No attempt has been made to deal with multithreaded applications.
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36
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37 If ! HAVE_XSI_STACK_OVERFLOW_HEURISTIC, the current implementation
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38 assumes that, if the RLIMIT_STACK limit changes during execution,
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39 then c_stack_action is invoked immediately afterwards. */
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40
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41 #if HAVE_CONFIG_H
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42 # include <config.h>
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43 #endif
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44
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45 #ifndef __attribute__
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46 # if __GNUC__ < 3 || __STRICT_ANSI__
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47 # define __attribute__(x)
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48 # endif
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49 #endif
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50
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51 #include "gettext.h"
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52 #define _(msgid) gettext (msgid)
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53
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54 #include <errno.h>
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55 #ifndef ENOTSUP
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56 # define ENOTSUP EINVAL
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57 #endif
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58 #ifndef EOVERFLOW
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59 # define EOVERFLOW EINVAL
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60 #endif
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61
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62 #include <signal.h>
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63 #if ! HAVE_STACK_T && ! defined stack_t
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64 typedef struct sigaltstack stack_t;
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65 #endif
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66
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67 #include <stdlib.h>
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68 #include <string.h>
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69
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70 #if HAVE_SYS_RESOURCE_H
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71 /* Include sys/time.h here, because...
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72 SunOS-4.1.x <sys/resource.h> fails to include <sys/time.h>.
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73 This gives "incomplete type" errors for ru_utime and tu_stime. */
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74 # if HAVE_SYS_TIME_H
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75 # include <sys/time.h>
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76 # endif
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77 # include <sys/resource.h>
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78 #endif
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79
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80 #if HAVE_UCONTEXT_H
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81 # include <ucontext.h>
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82 #endif
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83
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84 #if HAVE_UNISTD_H
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85 # include <unistd.h>
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86 #endif
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87 #ifndef STDERR_FILENO
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88 # define STDERR_FILENO 2
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89 #endif
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90
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91 #if DEBUG
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92 # include <stdio.h>
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93 #endif
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94
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95 #include "c-stack.h"
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96 #include "exitfail.h"
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97
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98 extern char *program_name;
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99
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100 /* The user-specified action to take when a SEGV-related program error
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101 or stack overflow occurs. */
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102 static void (* volatile segv_action) (int);
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103
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104 /* Translated messages for program errors and stack overflow. Do not
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105 translate them in the signal handler, since gettext is not
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106 async-signal-safe. */
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107 static char const * volatile program_error_message;
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108 static char const * volatile stack_overflow_message;
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109
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110 /* Output an error message, then exit with status EXIT_FAILURE if it
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111 appears to have been a stack overflow, or with a core dump
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112 otherwise. This function is async-signal-safe. */
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113
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114 static void die (int) __attribute__ ((noreturn));
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115 static void
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116 die (int signo)
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117 {
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118 char const *message =
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119 signo ? program_error_message : stack_overflow_message;
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120 segv_action (signo);
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121 write (STDERR_FILENO, program_name, strlen (program_name));
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122 write (STDERR_FILENO, ": ", 2);
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123 write (STDERR_FILENO, message, strlen (message));
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124 write (STDERR_FILENO, "\n", 1);
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125 if (! signo)
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126 _exit (exit_failure);
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127 kill (getpid (), signo);
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128 abort ();
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129 }
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130
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131 #if HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK
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132
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133 /* Direction of the C runtime stack. This function is
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134 async-signal-safe. */
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135
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136 # if STACK_DIRECTION
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137 # define find_stack_direction(ptr) STACK_DIRECTION
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138 # else
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139 static int
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140 find_stack_direction (char const *addr)
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141 {
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142 char dummy;
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143 return ! addr ? find_stack_direction (&dummy) : addr < &dummy ? 1 : -1;
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144 }
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145 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
146
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
147 # if HAVE_XSI_STACK_OVERFLOW_HEURISTIC
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
148 # define get_stack_location(argv) 0
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
149 # else
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
150
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
151 # if defined RLIMIT_STACK && defined _SC_PAGESIZE
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
152
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
153 /* Return the minimum machine address deducible from ARGV. This
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
154 includes the addresses of all the strings that ARGV points at, as
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
155 well as the address of ARGV itself. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
156
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
157 static char const *
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
158 min_address_from_argv (char * const *argv)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
159 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
160 char const *min = (char const *) argv;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
161 char const *p;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
162 while ((p = *argv++))
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
163 if (p < min)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
164 min = p;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
165 return min;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
166 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
167
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
168 /* Return the maximum machine address deducible from ARGV. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
169
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
170 static char const *
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
171 max_address_from_argv (char * const *argv)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
172 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
173 char const *max = *argv;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
174 char const *max1;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
175 char const *p;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
176 while ((p = *argv++))
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
177 if (max < p)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
178 max = p;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
179 max1 = (char const *) (argv + 1);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
180 return max && max1 < max ? max + strlen (max) + 1 : max1;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
181 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
182 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
183
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
184 /* The base and size of the stack, determined at startup. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
185 static char const * volatile stack_base;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
186 static size_t volatile stack_size;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
187
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
188 /* Store the base and size of the stack into the static variables
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
189 STACK_BASE and STACK_SIZE. The base is the numerically lowest
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
190 address in the stack. Return -1 (setting errno) if this cannot be
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
191 done. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
192
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
193 static int
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
194 get_stack_location (char * const *argv)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
195 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
196 # if ! (defined RLIMIT_STACK && defined _SC_PAGESIZE)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
197
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
198 errno = ENOTSUP;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
199 return -1;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
200
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
201 # else
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
202
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
203 struct rlimit rlimit;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
204 int r = getrlimit (RLIMIT_STACK, &rlimit);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
205 if (r == 0)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
206 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
207 char const *base;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
208 size_t size = rlimit.rlim_cur;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
209 extern char **environ;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
210 size_t page_size = sysconf (_SC_PAGESIZE);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
211 int stack_direction = find_stack_direction (0);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
212
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
213 # if HAVE_GETCONTEXT && HAVE_DECL_GETCONTEXT
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
214 ucontext_t context;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
215 if (getcontext (&context) == 0)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
216 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
217 base = context.uc_stack.ss_sp;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
218 if (stack_direction < 0)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
219 base -= size - context.uc_stack.ss_size;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
220 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
221 else
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
222 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
223 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
224 if (stack_direction < 0)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
225 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
226 char const *a = max_address_from_argv (argv);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
227 char const *b = max_address_from_argv (environ);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
228 base = (a < b ? b : a) - size;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
229 base += - (size_t) base % page_size;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
230 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
231 else
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
232 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
233 char const *a = min_address_from_argv (argv);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
234 char const *b = min_address_from_argv (environ);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
235 base = a < b ? a : b;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
236 base -= (size_t) base % page_size;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
237 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
238 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
239
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
240 if (size != rlimit.rlim_cur
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
241 || rlimit.rlim_cur < 0
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
242 || base + size < base
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
243 # ifdef RLIM_SAVED_CUR
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
244 || rlimit.rlim_cur == RLIM_SAVED_CUR
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
245 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
246 # ifdef RLIM_SAVED_MAX
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
247 || rlimit.rlim_cur == RLIM_SAVED_MAX
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
248 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
249 # ifdef RLIM_INFINITY
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
250 || rlimit.rlim_cur == RLIM_INFINITY
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
251 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
252 )
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
253 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
254 errno = EOVERFLOW;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
255 return -1;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
256 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
257
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
258 stack_base = base;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
259 stack_size = size;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
260
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
261 # if DEBUG
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
262 fprintf (stderr, "get_stack_location base=%p size=%lx\n",
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
263 base, (unsigned long) size);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
264 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
265 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
266
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
267 return r;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
268
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
269 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
270 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
271 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
272
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
273 /* Storage for the alternate signal stack. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
274 static union
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 char buffer[SIGSTKSZ];
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 /* These other members are for proper alignment. There's no
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
279 standard way to guarantee stack alignment, but this seems enough
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
280 in practice. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
281 long double ld;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
282 long l;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
283 void *p;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
284 } alternate_signal_stack;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
285
3910
2f34e0925fe3 (segv_handler, c_stack_action) [! defined SA_SIGINFO]:
Jim Meyering <jim@meyering.net>
parents: 3902
diff changeset
286 # if defined SA_ONSTACK && defined SA_SIGINFO && defined _SC_PAGESIZE
3902
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
287
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
288 /* 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
289 async-signal-safe. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
290
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
291 static void segv_handler (int, siginfo_t *, void *) __attribute__((noreturn));
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
292 static void
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
293 segv_handler (int signo, siginfo_t *info,
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
294 void *context __attribute__ ((unused)))
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
295 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
296 /* Clear SIGNO if it seems to have been a stack overflow. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
297 if (0 < info->si_code)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
298 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
299 /* If the faulting address is within the stack, or within one
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
300 page of the stack end, assume that it is a stack
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
301 overflow. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
302 # if HAVE_XSI_STACK_OVERFLOW_HEURISTIC
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
303 ucontext_t const *user_context = context;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
304 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
305 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
306 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
307 char const *faulting_address = info->si_addr;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
308 size_t s = faulting_address - stack_base;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
309 size_t page_size = sysconf (_SC_PAGESIZE);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
310 if (find_stack_direction (0) < 0)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
311 s += page_size;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
312 if (s < stack_size + page_size)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
313 signo = 0;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
314
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
315 # if DEBUG
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
316 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
317 char buf[1024];
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
318 sprintf (buf,
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
319 "segv_handler fault=%p base=%p size=%lx page=%lx signo=%d\n",
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
320 faulting_address, stack_base, (unsigned long) stack_size,
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
321 (unsigned long) page_size, signo);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
322 write (STDERR_FILENO, buf, strlen (buf));
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
323 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
324 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
325 }
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 die (signo);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
328 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
329 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
330
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
331 static void
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
332 null_action (int signo __attribute__ ((unused)))
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 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
335
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
336 /* Assuming ARGV is the argument vector of `main', set up ACTION so
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
337 that it is invoked on C stack overflow. Return -1 (setting errno)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
338 if this cannot be done.
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
339
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
340 When ACTION is called, it is passed an argument equal to SIGSEGV
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
341 for a segmentation violation that does not appear related to stack
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
342 overflow, and is passed zero otherwise.
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
343
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
344 A null ACTION acts like an action that does nothing.
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
345
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
346 ACTION must be async-signal-safe. ACTION together with its callees
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
347 must not require more than SIGSTKSZ bytes of stack space. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
348
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
349 int
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
350 c_stack_action (char * const *argv __attribute__ ((unused)),
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
351 void (*action) (int))
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
352 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
353 int r = get_stack_location (argv);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
354 if (r != 0)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
355 return r;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
356
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
357 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
358 stack_t st;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
359 st.ss_flags = 0;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
360 st.ss_sp = alternate_signal_stack.buffer;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
361 st.ss_size = sizeof alternate_signal_stack.buffer;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
362 r = sigaltstack (&st, 0);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
363 if (r != 0)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
364 return r;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
365 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
366
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
367 segv_action = action ? action : null_action;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
368 program_error_message = _("program error");
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
369 stack_overflow_message = _("stack overflow");
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
370
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
371 {
3910
2f34e0925fe3 (segv_handler, c_stack_action) [! defined SA_SIGINFO]:
Jim Meyering <jim@meyering.net>
parents: 3902
diff changeset
372 # if ! (defined SA_ONSTACK && defined SA_SIGINFO && defined _SC_PAGESIZE)
3902
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
373 return signal (SIGSEGV, die) == SIG_ERR ? -1 : 0;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
374 # else
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
375 struct sigaction act;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
376 sigemptyset (&act.sa_mask);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
377
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
378 /* POSIX 1003.1-2001 says SA_RESETHAND implies SA_NODEFER, but
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
379 this is not true on Solaris 8 at least. It doesn't hurt to use
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
380 SA_NODEFER here, so leave it in. */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
381 act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
382
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
383 act.sa_sigaction = segv_handler;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
384
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
385 return sigaction (SIGSEGV, &act, 0);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
386 # endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
387 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
388 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
389
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
390 #else /* ! (HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK) */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
391
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
392 int
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
393 c_stack_action (char * const *argv __attribute__ ((unused)),
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
394 void (*action) (int) __attribute__ ((unused)))
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
395 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
396 errno = ENOTSUP;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
397 return -1;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
398 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
399
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
400 #endif
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
401
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
402
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
403
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
404 #if DEBUG
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
405
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
406 int volatile exit_failure;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
407
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
408 static long
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
409 recurse (char *p)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
410 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
411 char array[500];
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
412 array[0] = 1;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
413 return *p + recurse (array);
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
414 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
415
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
416 char *program_name;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
417
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
418 int
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
419 main (int argc __attribute__ ((unused)), char **argv)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
420 {
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
421 program_name = argv[0];
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
422 fprintf (stderr, "The last line of output should be \"stack overflow\".\n");
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
423 if (c_stack_action (argv, 0) == 0)
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
424 return recurse ("\1");
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
425 perror ("c_stack_action");
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
426 return 1;
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
427 }
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
428
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
429 #endif /* DEBUG */
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
430
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
431 /*
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
432 Local Variables:
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
433 compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W c-stack.c"
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
434 End:
f26afed46772 New file, from diffutils-2.8.2.
Jim Meyering <jim@meyering.net>
parents:
diff changeset
435 */