1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- |
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2 | * |
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3 | * Copyright (C) 2006 Red Hat, Inc. |
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4 | * Copyright (C) 2007 William Jon McCann <mccann@jhu.edu> |
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5 | * |
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6 | * This program is free software; you can redistribute it and/or modify |
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7 | * it under the terms of the GNU General Public License as published by |
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8 | * the Free Software Foundation; either version 2 of the License, or |
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9 | * (at your option) any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU General Public License |
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17 | * along with this program; if not, write to the Free Software |
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18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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19 | * |
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20 | */ |
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21 | |
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22 | #include "config.h" |
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23 | |
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24 | #include <stdlib.h> |
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25 | #include <stdio.h> |
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26 | #include <fcntl.h> |
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27 | #include <unistd.h> |
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28 | #include <string.h> |
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29 | #include <signal.h> |
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30 | #if HAVE_EXECINFO_H |
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31 | #include <execinfo.h> |
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32 | #endif |
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33 | #include <syslog.h> |
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34 | #include <sys/wait.h> |
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35 | #include <sys/stat.h> |
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36 | |
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37 | #include <glib.h> |
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38 | #include <glib/gi18n.h> |
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39 | #include <glib/gstdio.h> |
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40 | #include <glib-object.h> |
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41 | |
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42 | #include "gdm-signal-handler.h" |
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43 | |
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44 | #define GDM_SIGNAL_HANDLER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_SIGNAL_HANDLER, GdmSignalHandlerPrivate)) |
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45 | |
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46 | typedef struct { |
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47 | int signal_number; |
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48 | GdmSignalHandlerFunc func; |
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49 | gpointer data; |
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50 | guint id; |
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51 | } CallbackData; |
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52 | |
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53 | struct GdmSignalHandlerPrivate |
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54 | { |
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55 | GHashTable *lookup; |
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56 | GHashTable *id_lookup; |
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57 | GHashTable *action_lookup; |
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58 | guint next_id; |
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59 | GDestroyNotify fatal_func; |
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60 | gpointer fatal_data; |
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61 | }; |
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62 | |
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63 | static void gdm_signal_handler_class_init (GdmSignalHandlerClass *klass); |
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64 | static void gdm_signal_handler_init (GdmSignalHandler *signal_handler); |
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65 | static void gdm_signal_handler_finalize (GObject *object); |
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66 | |
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67 | static gpointer signal_handler_object = NULL; |
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68 | static int signal_pipes[2]; |
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69 | static int signals_blocked = 0; |
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70 | static sigset_t signals_block_mask; |
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71 | static sigset_t signals_oldmask; |
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72 | |
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73 | G_DEFINE_TYPE (GdmSignalHandler, gdm_signal_handler, G_TYPE_OBJECT) |
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74 | |
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75 | static void |
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76 | block_signals_push (void) |
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77 | { |
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78 | signals_blocked++; |
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79 | |
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80 | if (signals_blocked == 1) { |
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81 | /* Set signal mask */ |
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82 | sigemptyset (&signals_block_mask); |
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83 | sigfillset (&signals_block_mask); |
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84 | sigprocmask (SIG_BLOCK, &signals_block_mask, &signals_oldmask); |
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85 | } |
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86 | } |
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87 | |
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88 | static void |
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89 | block_signals_pop (void) |
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90 | { |
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91 | signals_blocked--; |
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92 | |
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93 | if (signals_blocked == 0) { |
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94 | /* Set signal mask */ |
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95 | sigprocmask (SIG_SETMASK, &signals_oldmask, NULL); |
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96 | } |
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97 | } |
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98 | |
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99 | static gboolean |
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100 | signal_io_watch (GIOChannel *ioc, |
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101 | GIOCondition condition, |
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102 | GdmSignalHandler *handler) |
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103 | { |
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104 | char buf[256]; |
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105 | gboolean is_fatal; |
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106 | gsize bytes_read; |
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107 | int i; |
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108 | |
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109 | block_signals_push (); |
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110 | |
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111 | g_io_channel_read_chars (ioc, buf, sizeof (buf), &bytes_read, NULL); |
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112 | |
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113 | is_fatal = FALSE; |
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114 | |
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115 | for (i = 0; i < bytes_read; i++) { |
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116 | int signum; |
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117 | GSList *handlers; |
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118 | GSList *l; |
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119 | |
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120 | signum = (gint32)buf[i]; |
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121 | |
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122 | g_debug ("GdmSignalHandler: handling signal %d", signum); |
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123 | handlers = g_hash_table_lookup (handler->priv->lookup, GINT_TO_POINTER (signum)); |
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124 | |
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125 | g_debug ("GdmSignalHandler: Found %u callbacks", g_slist_length (handlers)); |
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126 | for (l = handlers; l != NULL; l = l->next) { |
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127 | gboolean res; |
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128 | CallbackData *data; |
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129 | |
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130 | data = g_hash_table_lookup (handler->priv->id_lookup, l->data); |
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131 | if (data != NULL) { |
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132 | if (data->func != NULL) { |
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133 | g_debug ("GdmSignalHandler: running %d handler: %p", signum, data->func); |
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134 | res = data->func (signum, data->data); |
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135 | if (! res) { |
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136 | is_fatal = TRUE; |
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137 | } |
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138 | } |
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139 | } |
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140 | } |
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141 | } |
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142 | |
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143 | block_signals_pop (); |
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144 | |
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145 | if (is_fatal) { |
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146 | if (handler->priv->fatal_func != NULL) { |
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147 | g_debug ("GdmSignalHandler: Caught termination signal - calling fatal func"); |
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148 | handler->priv->fatal_func (handler->priv->fatal_data); |
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149 | } else { |
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150 | g_debug ("GdmSignalHandler: Caught termination signal - exiting"); |
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151 | exit (1); |
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152 | } |
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153 | |
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154 | return FALSE; |
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155 | } |
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156 | |
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157 | g_debug ("GdmSignalHandler: Done handling signals"); |
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158 | |
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159 | return TRUE; |
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160 | } |
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161 | |
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162 | static void |
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163 | fallback_get_backtrace (void) |
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164 | { |
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165 | #ifdef HAVE_EXECINFO_H |
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166 | void * frames[64]; |
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167 | size_t size; |
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168 | char ** strings; |
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169 | size_t i; |
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170 | |
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171 | size = backtrace (frames, G_N_ELEMENTS (frames)); |
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172 | if ((strings = backtrace_symbols (frames, size))) { |
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173 | syslog (LOG_CRIT, "******************* START ********************************"); |
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174 | for (i = 0; i < size; i++) { |
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175 | syslog (LOG_CRIT, "Frame %zd: %s", i, strings[i]); |
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176 | } |
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177 | free (strings); |
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178 | syslog (LOG_CRIT, "******************* END **********************************"); |
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179 | return; |
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180 | } |
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181 | #endif |
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182 | g_warning ("GDM crashed, but symbols couldn't be retrieved."); |
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183 | } |
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184 | |
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185 | |
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186 | static gboolean |
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187 | crashlogger_get_backtrace (void) |
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188 | { |
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189 | gboolean success = FALSE; |
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190 | int pid; |
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191 | |
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192 | pid = fork (); |
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193 | if (pid > 0) { |
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194 | /* Wait for the child to finish */ |
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195 | int estatus; |
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196 | if (waitpid (pid, &estatus, 0) != -1) { |
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197 | /* Only succeed if the crashlogger succeeded */ |
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198 | if (WIFEXITED (estatus) && (WEXITSTATUS (estatus) == 0)) { |
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199 | success = TRUE; |
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200 | } |
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201 | } |
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202 | } else if (pid == 0) { |
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203 | /* Child process */ |
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204 | execl (LIBEXECDIR "/gdm-crash-logger", |
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205 | LIBEXECDIR "/gdm-crash-logger", NULL); |
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206 | } |
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207 | |
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208 | return success; |
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209 | } |
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210 | |
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211 | |
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212 | static void |
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213 | gdm_signal_handler_backtrace (void) |
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214 | { |
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215 | struct stat s; |
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216 | gboolean fallback = TRUE; |
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217 | |
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218 | /* Try to use gdb via gdm-crash-logger if it exists, since |
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219 | * we get much better information out of it. Otherwise |
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220 | * fall back to execinfo. |
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221 | */ |
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222 | if (g_stat (LIBEXECDIR "/gdm-crash-logger", &s) == 0) { |
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223 | fallback = crashlogger_get_backtrace () ? FALSE : TRUE; |
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224 | } |
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225 | |
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226 | if (fallback) { |
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227 | fallback_get_backtrace (); |
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228 | } |
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229 | } |
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230 | |
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231 | static void |
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232 | signal_handler (int signo) |
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233 | { |
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234 | static int in_fatal = 0; |
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235 | int ignore; |
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236 | guchar signo_byte = signo; |
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237 | |
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238 | /* avoid loops */ |
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239 | if (in_fatal > 0) { |
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240 | return; |
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241 | } |
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242 | |
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243 | ++in_fatal; |
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244 | |
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245 | switch (signo) { |
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246 | case SIGSEGV: |
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247 | case SIGBUS: |
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248 | case SIGILL: |
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249 | case SIGABRT: |
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250 | case SIGTRAP: |
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251 | gdm_signal_handler_backtrace (); |
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252 | exit (1); |
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253 | break; |
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254 | case SIGFPE: |
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255 | case SIGPIPE: |
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256 | /* let the fatal signals interrupt us */ |
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257 | --in_fatal; |
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258 | gdm_signal_handler_backtrace (); |
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259 | ignore = write (signal_pipes [1], &signo_byte, 1); |
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260 | break; |
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261 | default: |
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262 | --in_fatal; |
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263 | ignore = write (signal_pipes [1], &signo_byte, 1); |
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264 | break; |
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265 | } |
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266 | } |
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267 | |
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268 | static void |
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269 | catch_signal (GdmSignalHandler *handler, |
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270 | int signal_number) |
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271 | { |
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272 | struct sigaction action; |
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273 | struct sigaction *old_action; |
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274 | |
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275 | g_debug ("GdmSignalHandler: Registering for %d signals", signal_number); |
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276 | |
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277 | action.sa_handler = signal_handler; |
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278 | sigemptyset (&action.sa_mask); |
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279 | action.sa_flags = 0; |
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280 | |
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281 | old_action = g_new0 (struct sigaction, 1); |
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282 | |
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283 | sigaction (signal_number, &action, old_action); |
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284 | |
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285 | g_hash_table_insert (handler->priv->action_lookup, |
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286 | GINT_TO_POINTER (signal_number), |
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287 | old_action); |
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288 | } |
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289 | |
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290 | static void |
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291 | uncatch_signal (GdmSignalHandler *handler, |
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292 | int signal_number) |
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293 | { |
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294 | struct sigaction *old_action; |
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295 | |
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296 | g_debug ("GdmSignalHandler: Unregistering for %d signals", signal_number); |
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297 | |
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298 | old_action = g_hash_table_lookup (handler->priv->action_lookup, |
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299 | GINT_TO_POINTER (signal_number)); |
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300 | g_hash_table_remove (handler->priv->action_lookup, |
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301 | GINT_TO_POINTER (signal_number)); |
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302 | |
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303 | sigaction (signal_number, old_action, NULL); |
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304 | |
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305 | g_free (old_action); |
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306 | } |
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307 | |
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308 | guint |
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309 | gdm_signal_handler_add (GdmSignalHandler *handler, |
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310 | int signal_number, |
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311 | GdmSignalHandlerFunc callback, |
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312 | gpointer data) |
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313 | { |
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314 | CallbackData *cdata; |
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315 | GSList *list; |
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316 | |
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317 | g_return_val_if_fail (GDM_IS_SIGNAL_HANDLER (handler), 0); |
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318 | |
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319 | cdata = g_new0 (CallbackData, 1); |
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320 | cdata->signal_number = signal_number; |
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321 | cdata->func = callback; |
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322 | cdata->data = data; |
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323 | cdata->id = handler->priv->next_id++; |
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324 | |
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325 | g_debug ("GdmSignalHandler: Adding handler %u: signum=%d %p", cdata->id, cdata->signal_number, cdata->func); |
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326 | |
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327 | if (g_hash_table_lookup (handler->priv->action_lookup, GINT_TO_POINTER (signal_number)) == NULL) { |
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328 | catch_signal (handler, signal_number); |
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329 | } |
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330 | |
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331 | /* ID lookup owns the CallbackData */ |
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332 | g_hash_table_insert (handler->priv->id_lookup, GUINT_TO_POINTER (cdata->id), cdata); |
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333 | |
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334 | list = g_hash_table_lookup (handler->priv->lookup, GINT_TO_POINTER (signal_number)); |
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335 | list = g_slist_prepend (list, GUINT_TO_POINTER (cdata->id)); |
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336 | |
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337 | g_hash_table_insert (handler->priv->lookup, GINT_TO_POINTER (signal_number), list); |
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338 | |
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339 | return cdata->id; |
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340 | } |
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341 | |
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342 | void |
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343 | gdm_signal_handler_add_fatal (GdmSignalHandler *handler) |
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344 | { |
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345 | g_return_if_fail (GDM_IS_SIGNAL_HANDLER (handler)); |
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346 | |
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347 | gdm_signal_handler_add (handler, SIGILL, NULL, NULL); |
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348 | gdm_signal_handler_add (handler, SIGBUS, NULL, NULL); |
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349 | gdm_signal_handler_add (handler, SIGSEGV, NULL, NULL); |
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350 | gdm_signal_handler_add (handler, SIGABRT, NULL, NULL); |
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351 | gdm_signal_handler_add (handler, SIGTRAP, NULL, NULL); |
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352 | } |
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353 | |
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354 | static void |
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355 | callback_data_free (CallbackData *d) |
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356 | { |
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357 | g_free (d); |
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358 | } |
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359 | |
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360 | static void |
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361 | gdm_signal_handler_remove_and_free_data (GdmSignalHandler *handler, |
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362 | CallbackData *cdata) |
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363 | { |
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364 | GSList *list; |
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365 | |
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366 | g_return_if_fail (GDM_IS_SIGNAL_HANDLER (handler)); |
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367 | |
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368 | list = g_hash_table_lookup (handler->priv->lookup, GINT_TO_POINTER (cdata->signal_number)); |
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369 | list = g_slist_remove_all (list, GUINT_TO_POINTER (cdata->id)); |
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370 | if (list == NULL) { |
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371 | uncatch_signal (handler, cdata->signal_number); |
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372 | } |
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373 | |
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374 | g_debug ("GdmSignalHandler: Removing handler %u: signum=%d %p", cdata->signal_number, cdata->id, cdata->func); |
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375 | /* put changed list back in */ |
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376 | g_hash_table_insert (handler->priv->lookup, GINT_TO_POINTER (cdata->signal_number), list); |
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377 | |
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378 | g_hash_table_remove (handler->priv->id_lookup, GUINT_TO_POINTER (cdata->id)); |
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379 | } |
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380 | |
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381 | void |
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382 | gdm_signal_handler_remove (GdmSignalHandler *handler, |
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383 | guint id) |
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384 | { |
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385 | CallbackData *found; |
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386 | |
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387 | g_return_if_fail (GDM_IS_SIGNAL_HANDLER (handler)); |
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388 | |
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389 | found = g_hash_table_lookup (handler->priv->id_lookup, GUINT_TO_POINTER (id)); |
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390 | if (found != NULL) { |
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391 | gdm_signal_handler_remove_and_free_data (handler, found); |
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392 | found = NULL; |
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393 | } |
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394 | } |
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395 | |
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396 | static CallbackData * |
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397 | find_callback_data_by_func (GdmSignalHandler *handler, |
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398 | guint signal_number, |
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399 | GdmSignalHandlerFunc callback, |
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400 | gpointer data) |
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401 | { |
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402 | GSList *list; |
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403 | GSList *l; |
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404 | CallbackData *found; |
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405 | |
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406 | found = NULL; |
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407 | |
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408 | list = g_hash_table_lookup (handler->priv->lookup, GINT_TO_POINTER (signal_number)); |
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409 | |
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410 | for (l = list; l != NULL; l = l->next) { |
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411 | guint id; |
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412 | CallbackData *d; |
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413 | |
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414 | id = GPOINTER_TO_UINT (l->data); |
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415 | |
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416 | d = g_hash_table_lookup (handler->priv->id_lookup, GUINT_TO_POINTER (id)); |
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417 | if (d != NULL |
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418 | && d->func == callback |
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419 | && d->data == data) { |
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420 | found = d; |
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421 | break; |
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422 | } |
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423 | } |
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424 | |
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425 | return found; |
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426 | } |
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427 | |
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428 | void |
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429 | gdm_signal_handler_remove_func (GdmSignalHandler *handler, |
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430 | guint signal_number, |
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431 | GdmSignalHandlerFunc callback, |
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432 | gpointer data) |
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433 | { |
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434 | CallbackData *found; |
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435 | |
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436 | g_return_if_fail (GDM_IS_SIGNAL_HANDLER (handler)); |
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437 | |
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438 | found = find_callback_data_by_func (handler, signal_number, callback, data); |
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439 | |
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440 | if (found != NULL) { |
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441 | gdm_signal_handler_remove_and_free_data (handler, found); |
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442 | found = NULL; |
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443 | } |
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444 | |
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445 | /* FIXME: once all handlers are removed deregister signum handler */ |
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446 | } |
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447 | |
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448 | static void |
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449 | gdm_signal_handler_class_init (GdmSignalHandlerClass *klass) |
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450 | { |
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451 | GObjectClass *object_class = G_OBJECT_CLASS (klass); |
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452 | |
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453 | object_class->finalize = gdm_signal_handler_finalize; |
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454 | |
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455 | g_type_class_add_private (klass, sizeof (GdmSignalHandlerPrivate)); |
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456 | } |
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457 | |
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458 | static void |
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459 | signal_list_free (GSList *list) |
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460 | { |
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461 | g_slist_free (list); |
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462 | } |
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463 | |
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464 | void |
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465 | gdm_signal_handler_set_fatal_func (GdmSignalHandler *handler, |
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466 | GDestroyNotify func, |
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467 | gpointer user_data) |
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468 | { |
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469 | g_return_if_fail (GDM_IS_SIGNAL_HANDLER (handler)); |
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470 | |
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471 | handler->priv->fatal_func = func; |
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472 | handler->priv->fatal_data = user_data; |
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473 | } |
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474 | |
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475 | static void |
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476 | gdm_signal_handler_init (GdmSignalHandler *handler) |
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477 | { |
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478 | GIOChannel *ioc; |
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479 | |
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480 | handler->priv = GDM_SIGNAL_HANDLER_GET_PRIVATE (handler); |
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481 | |
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482 | handler->priv->next_id = 1; |
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483 | |
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484 | handler->priv->lookup = g_hash_table_new (NULL, NULL); |
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485 | handler->priv->id_lookup = g_hash_table_new (NULL, NULL); |
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486 | handler->priv->action_lookup = g_hash_table_new (NULL, NULL); |
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487 | |
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488 | if (pipe (signal_pipes) == -1) { |
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489 | g_error ("Could not create pipe() for signal handling"); |
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490 | } |
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491 | |
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492 | ioc = g_io_channel_unix_new (signal_pipes[0]); |
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493 | g_io_channel_set_flags (ioc, G_IO_FLAG_NONBLOCK, NULL); |
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494 | g_io_add_watch (ioc, G_IO_IN, (GIOFunc)signal_io_watch, handler); |
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495 | g_io_channel_set_close_on_unref (ioc, TRUE); |
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496 | g_io_channel_unref (ioc); |
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497 | } |
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498 | |
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499 | static void |
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500 | gdm_signal_handler_finalize (GObject *object) |
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501 | { |
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502 | GdmSignalHandler *handler; |
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503 | GList *l; |
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504 | |
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505 | g_return_if_fail (object != NULL); |
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506 | g_return_if_fail (GDM_IS_SIGNAL_HANDLER (object)); |
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507 | |
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508 | handler = GDM_SIGNAL_HANDLER (object); |
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509 | |
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510 | g_debug ("GdmSignalHandler: Finalizing signal handler"); |
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511 | |
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512 | g_return_if_fail (handler->priv != NULL); |
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513 | for (l = g_hash_table_get_values (handler->priv->lookup); |
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514 | l != NULL; l = l->next) { |
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515 | signal_list_free ((GSList *) l->data); |
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516 | } |
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517 | g_hash_table_destroy (handler->priv->lookup); |
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518 | for (l = g_hash_table_get_values (handler->priv->id_lookup); |
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519 | l != NULL; l = l->next) { |
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520 | callback_data_free ((CallbackData *) l->data); |
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521 | } |
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522 | g_hash_table_destroy (handler->priv->id_lookup); |
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523 | for (l = g_hash_table_get_values (handler->priv->action_lookup); |
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524 | l != NULL; l = l->next) { |
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525 | g_free (l->data); |
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526 | } |
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527 | g_hash_table_destroy (handler->priv->action_lookup); |
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528 | |
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529 | close (signal_pipes [0]); |
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530 | close (signal_pipes [1]); |
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531 | |
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532 | G_OBJECT_CLASS (gdm_signal_handler_parent_class)->finalize (object); |
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533 | } |
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534 | |
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535 | GdmSignalHandler * |
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536 | gdm_signal_handler_new (void) |
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537 | { |
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538 | if (signal_handler_object != NULL) { |
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539 | g_object_ref (signal_handler_object); |
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540 | } else { |
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541 | signal_handler_object = g_object_new (GDM_TYPE_SIGNAL_HANDLER, NULL); |
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542 | g_object_add_weak_pointer (signal_handler_object, |
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543 | (gpointer *) &signal_handler_object); |
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544 | } |
---|
545 | |
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546 | return GDM_SIGNAL_HANDLER (signal_handler_object); |
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547 | } |
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