[134] | 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 | } |
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| 545 | |
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| 546 | return GDM_SIGNAL_HANDLER (signal_handler_object); |
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| 547 | } |
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