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annotate lib/c-stack.c @ 3910:2f34e0925fe3

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(segv_handler, c_stack_action) [! defined SA_SIGINFO]: Do not assume SA_SIGINFO behavior. Bug reported by Jim Meyering on NetBSD 1.5.2.
author Jim Meyering <jim@meyering.net>
date Sat, 22 Jun 2002 16:20:15 +0000
parents f26afed46772
children 181064782c71
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/resource.h>
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72 #endif
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73
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74 #if HAVE_UCONTEXT_H
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75 # include <ucontext.h>
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76 #endif
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77
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78 #if HAVE_UNISTD_H
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79 # include <unistd.h>
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80 #endif
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81 #ifndef STDERR_FILENO
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82 # define STDERR_FILENO 2
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83 #endif
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84
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85 #if DEBUG
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86 # include <stdio.h>
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87 #endif
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88
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89 #include "c-stack.h"
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90 #include "exitfail.h"
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91
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92 extern char *program_name;
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93
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94 /* The user-specified action to take when a SEGV-related program error
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95 or stack overflow occurs. */
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96 static void (* volatile segv_action) (int);
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97
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98 /* Translated messages for program errors and stack overflow. Do not
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99 translate them in the signal handler, since gettext is not
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100 async-signal-safe. */
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101 static char const * volatile program_error_message;
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102 static char const * volatile stack_overflow_message;
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103
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104 /* Output an error message, then exit with status EXIT_FAILURE if it
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105 appears to have been a stack overflow, or with a core dump
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106 otherwise. This function is async-signal-safe. */
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107
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108 static void die (int) __attribute__ ((noreturn));
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109 static void
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110 die (int signo)
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111 {
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112 char const *message =
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113 signo ? program_error_message : stack_overflow_message;
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114 segv_action (signo);
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115 write (STDERR_FILENO, program_name, strlen (program_name));
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116 write (STDERR_FILENO, ": ", 2);
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117 write (STDERR_FILENO, message, strlen (message));
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118 write (STDERR_FILENO, "\n", 1);
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119 if (! signo)
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120 _exit (exit_failure);
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121 kill (getpid (), signo);
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122 abort ();
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123 }
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124
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125 #if HAVE_SIGALTSTACK && HAVE_DECL_SIGALTSTACK
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126
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127 /* Direction of the C runtime stack. This function is
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128 async-signal-safe. */
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129
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130 # if STACK_DIRECTION
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131 # define find_stack_direction(ptr) STACK_DIRECTION
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132 # else
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133 static int
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134 find_stack_direction (char const *addr)
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135 {
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136 char dummy;
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137 return ! addr ? find_stack_direction (&dummy) : addr < &dummy ? 1 : -1;
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138 }
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139 # endif
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140
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141 # if HAVE_XSI_STACK_OVERFLOW_HEURISTIC
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142 # define get_stack_location(argv) 0
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143 # else
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144
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145 # if defined RLIMIT_STACK && defined _SC_PAGESIZE
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146
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147 /* Return the minimum machine address deducible from ARGV. This
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148 includes the addresses of all the strings that ARGV points at, as
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149 well as the address of ARGV itself. */
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150
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151 static char const *
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152 min_address_from_argv (char * const *argv)
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153 {
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154 char const *min = (char const *) argv;
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155 char const *p;
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156 while ((p = *argv++))
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157 if (p < min)
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158 min = p;
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159 return min;
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160 }
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161
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162 /* Return the maximum machine address deducible from ARGV. */
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