[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) 2007 William Jon McCann <mccann@jhu.edu> |
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| 4 | * |
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| 5 | * This program is free software; you can redistribute it and/or modify |
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| 6 | * it under the terms of the GNU General Public License as published by |
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| 7 | * the Free Software Foundation; either version 2 of the License, or |
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| 8 | * (at your option) any later version. |
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| 9 | * |
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| 10 | * This program is distributed in the hope that it will be useful, |
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | * GNU General Public License for more details. |
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| 14 | * |
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| 15 | * You should have received a copy of the GNU General Public License |
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| 16 | * along with this program; if not, write to the Free Software |
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| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 18 | * |
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| 19 | */ |
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| 20 | |
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| 21 | #include "config.h" |
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| 22 | |
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| 23 | #include <stdlib.h> |
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| 24 | #include <stdio.h> |
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| 25 | #include <fcntl.h> |
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| 26 | #include <unistd.h> |
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| 27 | #include <string.h> |
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| 28 | #include <sys/types.h> |
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| 29 | #include <sys/wait.h> |
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| 30 | #include <errno.h> |
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| 31 | #include <signal.h> |
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| 32 | |
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| 33 | #include <glib.h> |
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| 34 | #include <glib/gi18n.h> |
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| 35 | #include <glib/gstdio.h> |
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| 36 | #include <glib-object.h> |
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| 37 | |
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| 38 | #include "gdm-common.h" |
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| 39 | |
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| 40 | #include "gdm-slave-proxy.h" |
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| 41 | |
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| 42 | #define GDM_SLAVE_PROXY_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_SLAVE_PROXY, GdmSlaveProxyPrivate)) |
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| 43 | |
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| 44 | #define MAX_LOGS 5 |
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| 45 | |
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| 46 | struct GdmSlaveProxyPrivate |
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| 47 | { |
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| 48 | char *command; |
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| 49 | char *log_path; |
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| 50 | GPid pid; |
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| 51 | guint child_watch_id; |
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| 52 | }; |
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| 53 | |
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| 54 | enum { |
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| 55 | PROP_0, |
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| 56 | PROP_COMMAND, |
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| 57 | PROP_LOG_PATH, |
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| 58 | }; |
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| 59 | |
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| 60 | enum { |
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| 61 | EXITED, |
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| 62 | DIED, |
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| 63 | LAST_SIGNAL |
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| 64 | }; |
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| 65 | |
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| 66 | static guint signals [LAST_SIGNAL] = { 0, }; |
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| 67 | |
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| 68 | static void gdm_slave_proxy_class_init (GdmSlaveProxyClass *klass); |
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| 69 | static void gdm_slave_proxy_init (GdmSlaveProxy *slave); |
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| 70 | static void gdm_slave_proxy_finalize (GObject *object); |
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| 71 | |
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| 72 | G_DEFINE_TYPE (GdmSlaveProxy, gdm_slave_proxy, G_TYPE_OBJECT) |
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| 73 | |
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| 74 | static void |
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| 75 | child_watch (GPid pid, |
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| 76 | int status, |
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| 77 | GdmSlaveProxy *slave) |
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| 78 | { |
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| 79 | g_debug ("GdmSlaveProxy: slave (pid:%d) done (%s:%d)", |
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| 80 | (int) pid, |
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| 81 | WIFEXITED (status) ? "status" |
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| 82 | : WIFSIGNALED (status) ? "signal" |
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| 83 | : "unknown", |
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| 84 | WIFEXITED (status) ? WEXITSTATUS (status) |
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| 85 | : WIFSIGNALED (status) ? WTERMSIG (status) |
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| 86 | : -1); |
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| 87 | |
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| 88 | g_spawn_close_pid (slave->priv->pid); |
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| 89 | slave->priv->pid = -1; |
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| 90 | slave->priv->child_watch_id = 0; |
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| 91 | |
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| 92 | if (WIFEXITED (status)) { |
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| 93 | int code = WEXITSTATUS (status); |
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| 94 | g_signal_emit (slave, signals [EXITED], 0, code); |
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| 95 | } else if (WIFSIGNALED (status)) { |
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| 96 | int num = WTERMSIG (status); |
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| 97 | g_signal_emit (slave, signals [DIED], 0, num); |
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| 98 | } |
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| 99 | } |
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| 100 | |
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| 101 | static void |
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| 102 | rotate_logs (const char *path, |
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| 103 | guint n_copies) |
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| 104 | { |
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| 105 | int i; |
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| 106 | |
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| 107 | for (i = n_copies - 1; i > 0; i--) { |
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| 108 | char *name_n; |
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| 109 | char *name_n1; |
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| 110 | |
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| 111 | name_n = g_strdup_printf ("%s.%d", path, i); |
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| 112 | if (i > 1) { |
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| 113 | name_n1 = g_strdup_printf ("%s.%d", path, i - 1); |
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| 114 | } else { |
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| 115 | name_n1 = g_strdup (path); |
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| 116 | } |
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| 117 | |
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| 118 | VE_IGNORE_EINTR (g_unlink (name_n)); |
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| 119 | VE_IGNORE_EINTR (g_rename (name_n1, name_n)); |
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| 120 | |
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| 121 | g_free (name_n1); |
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| 122 | g_free (name_n); |
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| 123 | } |
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| 124 | |
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| 125 | VE_IGNORE_EINTR (g_unlink (path)); |
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| 126 | } |
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| 127 | |
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| 128 | typedef struct { |
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| 129 | const char *log_file; |
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| 130 | } SpawnChildData; |
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| 131 | |
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| 132 | static void |
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| 133 | spawn_child_setup (SpawnChildData *data) |
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| 134 | { |
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| 135 | |
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| 136 | if (data->log_file != NULL) { |
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| 137 | int logfd; |
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| 138 | |
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| 139 | rotate_logs (data->log_file, MAX_LOGS); |
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| 140 | |
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| 141 | VE_IGNORE_EINTR (g_unlink (data->log_file)); |
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| 142 | VE_IGNORE_EINTR (logfd = open (data->log_file, O_CREAT|O_APPEND|O_TRUNC|O_WRONLY|O_EXCL, 0644)); |
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| 143 | |
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| 144 | if (logfd != -1) { |
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| 145 | VE_IGNORE_EINTR (dup2 (logfd, 1)); |
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| 146 | VE_IGNORE_EINTR (dup2 (logfd, 2)); |
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| 147 | close (logfd); |
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| 148 | } |
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| 149 | } |
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| 150 | } |
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| 151 | |
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| 152 | static gboolean |
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| 153 | spawn_command_line_async (const char *command_line, |
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| 154 | const char *log_file, |
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| 155 | char **env, |
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| 156 | GPid *child_pid, |
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| 157 | GError **error) |
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| 158 | { |
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| 159 | char **argv; |
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| 160 | GError *local_error; |
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| 161 | gboolean ret; |
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| 162 | gboolean res; |
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| 163 | SpawnChildData data; |
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| 164 | |
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| 165 | ret = FALSE; |
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| 166 | |
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| 167 | argv = NULL; |
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| 168 | local_error = NULL; |
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| 169 | if (! g_shell_parse_argv (command_line, NULL, &argv, &local_error)) { |
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| 170 | g_warning ("Could not parse command: %s", local_error->message); |
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| 171 | g_propagate_error (error, local_error); |
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| 172 | goto out; |
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| 173 | } |
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| 174 | |
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| 175 | data.log_file = log_file; |
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| 176 | |
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| 177 | local_error = NULL; |
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| 178 | res = g_spawn_async (NULL, |
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| 179 | argv, |
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| 180 | env, |
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| 181 | G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD, |
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| 182 | (GSpawnChildSetupFunc)spawn_child_setup, |
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| 183 | &data, |
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| 184 | child_pid, |
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| 185 | &local_error); |
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| 186 | |
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| 187 | if (! res) { |
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| 188 | g_warning ("Could not spawn command: %s", local_error->message); |
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| 189 | g_propagate_error (error, local_error); |
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| 190 | goto out; |
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| 191 | } |
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| 192 | |
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| 193 | ret = TRUE; |
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| 194 | out: |
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| 195 | g_strfreev (argv); |
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| 196 | |
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| 197 | return ret; |
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| 198 | } |
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| 199 | |
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| 200 | static gboolean |
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| 201 | spawn_slave (GdmSlaveProxy *slave) |
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| 202 | { |
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| 203 | gboolean result; |
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| 204 | GError *error; |
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| 205 | |
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| 206 | g_debug ("GdmSlaveProxy: Running command: %s", slave->priv->command); |
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| 207 | |
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| 208 | error = NULL; |
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| 209 | result = spawn_command_line_async (slave->priv->command, |
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| 210 | slave->priv->log_path, |
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| 211 | NULL, |
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| 212 | &slave->priv->pid, |
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| 213 | &error); |
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| 214 | if (! result) { |
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| 215 | g_warning ("Could not start command '%s': %s", slave->priv->command, error->message); |
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| 216 | g_error_free (error); |
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| 217 | goto out; |
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| 218 | } |
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| 219 | |
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| 220 | g_debug ("GdmSlaveProxy: Started slave with pid %d", slave->priv->pid); |
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| 221 | |
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| 222 | slave->priv->child_watch_id = g_child_watch_add (slave->priv->pid, |
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| 223 | (GChildWatchFunc)child_watch, |
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| 224 | slave); |
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| 225 | |
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| 226 | result = TRUE; |
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| 227 | |
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| 228 | out: |
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| 229 | |
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| 230 | return result; |
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| 231 | } |
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| 232 | |
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| 233 | static void |
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| 234 | kill_slave (GdmSlaveProxy *slave) |
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| 235 | { |
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| 236 | int exit_status; |
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| 237 | int res; |
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| 238 | |
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| 239 | if (slave->priv->pid <= 1) { |
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| 240 | return; |
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| 241 | } |
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| 242 | |
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| 243 | res = gdm_signal_pid (slave->priv->pid, SIGTERM); |
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| 244 | if (res < 0) { |
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| 245 | g_warning ("Unable to kill slave process"); |
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| 246 | } else { |
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| 247 | exit_status = gdm_wait_on_pid (slave->priv->pid); |
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| 248 | g_spawn_close_pid (slave->priv->pid); |
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| 249 | slave->priv->pid = 0; |
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| 250 | } |
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| 251 | } |
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| 252 | |
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| 253 | gboolean |
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| 254 | gdm_slave_proxy_start (GdmSlaveProxy *slave) |
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| 255 | { |
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| 256 | spawn_slave (slave); |
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| 257 | |
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| 258 | return TRUE; |
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| 259 | } |
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| 260 | |
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| 261 | gboolean |
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| 262 | gdm_slave_proxy_stop (GdmSlaveProxy *slave) |
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| 263 | { |
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| 264 | g_debug ("GdmSlaveProxy: Killing slave"); |
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| 265 | |
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| 266 | if (slave->priv->child_watch_id > 0) { |
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| 267 | g_source_remove (slave->priv->child_watch_id); |
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| 268 | slave->priv->child_watch_id = 0; |
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| 269 | } |
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| 270 | |
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| 271 | kill_slave (slave); |
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| 272 | |
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| 273 | return TRUE; |
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| 274 | } |
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| 275 | |
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| 276 | void |
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| 277 | gdm_slave_proxy_set_command (GdmSlaveProxy *slave, |
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| 278 | const char *command) |
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| 279 | { |
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| 280 | g_free (slave->priv->command); |
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| 281 | slave->priv->command = g_strdup (command); |
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| 282 | } |
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| 283 | |
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| 284 | void |
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| 285 | gdm_slave_proxy_set_log_path (GdmSlaveProxy *slave, |
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| 286 | const char *path) |
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| 287 | { |
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| 288 | g_free (slave->priv->log_path); |
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| 289 | slave->priv->log_path = g_strdup (path); |
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| 290 | } |
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| 291 | |
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| 292 | static void |
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| 293 | gdm_slave_proxy_set_property (GObject *object, |
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| 294 | guint prop_id, |
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| 295 | const GValue *value, |
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| 296 | GParamSpec *pspec) |
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| 297 | { |
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| 298 | GdmSlaveProxy *self; |
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| 299 | |
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| 300 | self = GDM_SLAVE_PROXY (object); |
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| 301 | |
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| 302 | switch (prop_id) { |
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| 303 | case PROP_COMMAND: |
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| 304 | gdm_slave_proxy_set_command (self, g_value_get_string (value)); |
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| 305 | break; |
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| 306 | case PROP_LOG_PATH: |
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| 307 | gdm_slave_proxy_set_log_path (self, g_value_get_string (value)); |
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| 308 | break; |
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| 309 | default: |
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| 310 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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| 311 | break; |
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| 312 | } |
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| 313 | } |
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| 314 | |
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| 315 | static void |
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| 316 | gdm_slave_proxy_get_property (GObject *object, |
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| 317 | guint prop_id, |
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| 318 | GValue *value, |
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| 319 | GParamSpec *pspec) |
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| 320 | { |
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| 321 | GdmSlaveProxy *self; |
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| 322 | |
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| 323 | self = GDM_SLAVE_PROXY (object); |
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| 324 | |
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| 325 | switch (prop_id) { |
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| 326 | case PROP_COMMAND: |
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| 327 | g_value_set_string (value, self->priv->command); |
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| 328 | break; |
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| 329 | case PROP_LOG_PATH: |
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| 330 | g_value_set_string (value, self->priv->log_path); |
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| 331 | break; |
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| 332 | default: |
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| 333 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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| 334 | break; |
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| 335 | } |
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| 336 | } |
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| 337 | |
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| 338 | static void |
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| 339 | gdm_slave_proxy_dispose (GObject *object) |
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| 340 | { |
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| 341 | GdmSlaveProxy *slave; |
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| 342 | |
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| 343 | slave = GDM_SLAVE_PROXY (object); |
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| 344 | |
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| 345 | g_debug ("GdmSlaveProxy: Disposing slave proxy"); |
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| 346 | gdm_slave_proxy_stop (slave); |
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| 347 | |
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| 348 | G_OBJECT_CLASS (gdm_slave_proxy_parent_class)->dispose (object); |
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| 349 | } |
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| 350 | |
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| 351 | static void |
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| 352 | gdm_slave_proxy_class_init (GdmSlaveProxyClass *klass) |
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| 353 | { |
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| 354 | GObjectClass *object_class = G_OBJECT_CLASS (klass); |
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| 355 | |
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| 356 | object_class->get_property = gdm_slave_proxy_get_property; |
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| 357 | object_class->set_property = gdm_slave_proxy_set_property; |
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| 358 | object_class->dispose = gdm_slave_proxy_dispose; |
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| 359 | object_class->finalize = gdm_slave_proxy_finalize; |
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| 360 | |
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| 361 | g_type_class_add_private (klass, sizeof (GdmSlaveProxyPrivate)); |
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| 362 | |
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| 363 | g_object_class_install_property (object_class, |
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| 364 | PROP_COMMAND, |
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| 365 | g_param_spec_string ("command", |
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| 366 | "command", |
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| 367 | "command", |
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| 368 | NULL, |
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| 369 | G_PARAM_READWRITE | G_PARAM_CONSTRUCT)); |
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| 370 | g_object_class_install_property (object_class, |
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| 371 | PROP_LOG_PATH, |
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| 372 | g_param_spec_string ("log-path", |
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| 373 | "log path", |
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| 374 | "log path", |
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| 375 | NULL, |
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| 376 | G_PARAM_READWRITE | G_PARAM_CONSTRUCT)); |
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| 377 | |
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| 378 | signals [EXITED] = |
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| 379 | g_signal_new ("exited", |
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| 380 | G_OBJECT_CLASS_TYPE (object_class), |
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| 381 | G_SIGNAL_RUN_FIRST, |
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| 382 | G_STRUCT_OFFSET (GdmSlaveProxyClass, exited), |
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| 383 | NULL, |
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| 384 | NULL, |
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| 385 | g_cclosure_marshal_VOID__INT, |
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| 386 | G_TYPE_NONE, |
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| 387 | 1, |
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| 388 | G_TYPE_INT); |
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| 389 | |
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| 390 | signals [DIED] = |
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| 391 | g_signal_new ("died", |
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| 392 | G_OBJECT_CLASS_TYPE (object_class), |
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| 393 | G_SIGNAL_RUN_FIRST, |
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| 394 | G_STRUCT_OFFSET (GdmSlaveProxyClass, died), |
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| 395 | NULL, |
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| 396 | NULL, |
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| 397 | g_cclosure_marshal_VOID__INT, |
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| 398 | G_TYPE_NONE, |
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| 399 | 1, |
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| 400 | G_TYPE_INT); |
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| 401 | } |
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| 402 | |
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| 403 | static void |
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| 404 | gdm_slave_proxy_init (GdmSlaveProxy *slave) |
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| 405 | { |
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| 406 | |
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| 407 | slave->priv = GDM_SLAVE_PROXY_GET_PRIVATE (slave); |
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| 408 | |
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| 409 | slave->priv->pid = -1; |
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| 410 | } |
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| 411 | |
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| 412 | static void |
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| 413 | gdm_slave_proxy_finalize (GObject *object) |
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| 414 | { |
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| 415 | GdmSlaveProxy *slave; |
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| 416 | |
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| 417 | g_return_if_fail (object != NULL); |
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| 418 | g_return_if_fail (GDM_IS_SLAVE_PROXY (object)); |
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| 419 | |
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| 420 | slave = GDM_SLAVE_PROXY (object); |
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| 421 | |
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| 422 | g_return_if_fail (slave->priv != NULL); |
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| 423 | |
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| 424 | g_free (slave->priv->command); |
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| 425 | |
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| 426 | G_OBJECT_CLASS (gdm_slave_proxy_parent_class)->finalize (object); |
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| 427 | } |
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| 428 | |
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| 429 | GdmSlaveProxy * |
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| 430 | gdm_slave_proxy_new (void) |
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| 431 | { |
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| 432 | GObject *object; |
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| 433 | |
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| 434 | object = g_object_new (GDM_TYPE_SLAVE_PROXY, |
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| 435 | NULL); |
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| 436 | |
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| 437 | return GDM_SLAVE_PROXY (object); |
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| 438 | } |
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