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/*
* Copyright (C) 2002 Red Hat, Inc.
*
* This is free software; you can redistribute it and/or modify it under
* the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/**
* SECTION: vte-reaper
* @short_description: A singleton object which catches %SIGCHLD signals and
* converts them into GObject-style "child-exited" signals
*
* Because an application may need to be notified when child processes
* exit, and because there is only one %SIGCHLD handler, the #VteTerminal
* widget relies on a #VteReaper to watch for %SIGCHLD notifications and
* retrieve the exit status of child processes which have exited. When
* glib provides child_watch functionality, the #VteReaper merely acts as
* a proxy for glib's own functionality.
*
* Since 0.11.11
*/
#include <config.h>
#include "debug.h"
#include "marshal.h"
#include "reaper.h"
static VteReaper *singleton_reaper = NULL;
G_DEFINE_TYPE(VteReaper, vte_reaper, G_TYPE_OBJECT)
static void
vte_reaper_child_watch_cb(GPid pid, gint status, gpointer data)
{
_vte_debug_print(VTE_DEBUG_SIGNALS,
"Reaper emitting child-exited signal.\n");
g_signal_emit_by_name(data, "child-exited", pid, status);
g_spawn_close_pid (pid);
}
/**
* vte_reaper_add_child:
* @pid: the ID of a child process which will be monitored
*
* Ensures that child-exited signals will be emitted when @pid exits. This is
* necessary for correct operation when running with glib versions >= 2.4.
*
* Returns: the new source ID
*
* Since 0.11.11
*/
int
vte_reaper_add_child(GPid pid)
{
return g_child_watch_add_full(G_PRIORITY_LOW,
pid,
vte_reaper_child_watch_cb,
vte_reaper_get(),
(GDestroyNotify)g_object_unref);
}
static void
vte_reaper_init(VteReaper *reaper)
{
}
static GObject*
vte_reaper_constructor (GType type,
guint n_construct_properties,
GObjectConstructParam *construct_properties)
{
if (singleton_reaper) {
return g_object_ref (singleton_reaper);
} else {
GObject *obj;
obj = G_OBJECT_CLASS (vte_reaper_parent_class)->constructor (type, n_construct_properties, construct_properties);
singleton_reaper = VTE_REAPER (obj);
return obj;
}
}
static void
vte_reaper_finalize(GObject *reaper)
{
G_OBJECT_CLASS(vte_reaper_parent_class)->finalize(reaper);
singleton_reaper = NULL;
}
static void
vte_reaper_class_init(VteReaperClass *klass)
{
GObjectClass *gobject_class;
/**
* VteReaper::child-exited:
* @vtereaper: the object which received the signal
* @arg1: the process ID of the exited child
* @arg2: the status of the exited child, as returned by waitpid()
*
* Emitted when the #VteReaper object detects that a child of the
* current process has exited.
*
* Since: 0.11.11
*/
klass->child_exited_signal = g_signal_new(g_intern_static_string("child-exited"),
G_OBJECT_CLASS_TYPE(klass),
G_SIGNAL_RUN_LAST,
0,
NULL,
NULL,
_vte_marshal_VOID__INT_INT,
G_TYPE_NONE,
2, G_TYPE_INT, G_TYPE_INT);
gobject_class = G_OBJECT_CLASS(klass);
gobject_class->constructor = vte_reaper_constructor;
gobject_class->finalize = vte_reaper_finalize;
}
/**
* vte_reaper_get:
*
* Finds the address of the global #VteReaper object, creating the object if
* necessary.
*
* Returns: the global #VteReaper object, which should not be unreffed.
*/
VteReaper *
vte_reaper_get(void)
{
return g_object_new(VTE_TYPE_REAPER, NULL);
}
#ifdef REAPER_MAIN
#include <unistd.h>
GMainContext *context;
GMainLoop *loop;
pid_t child;
static void
child_exited(GObject *object, int pid, int status, gpointer data)
{
g_print("[parent] Child with pid %d exited with code %d, "
"was waiting for %d.\n", pid, status, GPOINTER_TO_INT(data));
if (child == pid) {
g_print("[parent] Quitting.\n");
g_main_loop_quit(loop);
}
}
int
main(int argc, char **argv)
{
VteReaper *reaper;
pid_t p, q;
_vte_debug_init();
g_type_init();
context = g_main_context_default();
loop = g_main_loop_new(context, FALSE);
reaper = vte_reaper_get();
g_print("[parent] Forking.\n");
p = fork();
switch (p) {
case -1:
g_print("[parent] Fork failed.\n");
g_assert_not_reached();
break;
case 0:
g_print("[child] Going to sleep.\n");
sleep(10);
g_print("[child] Quitting.\n");
_exit(30);
break;
default:
g_print("[parent] Starting to wait for %d.\n", p);
child = p;
g_signal_connect(reaper,
"child-exited",
G_CALLBACK(child_exited),
GINT_TO_POINTER(child));
break;
}
g_print("[parent] Forking.\n");
q = fork();
switch (q) {
case -1:
g_print("[parent] Fork failed.\n");
g_assert_not_reached();
break;
case 0:
g_print("[child] Going to sleep.\n");
sleep(5);
_exit(5);
break;
default:
g_print("[parent] Not waiting for %d.\n", q);
break;
}
g_main_loop_run(loop);
g_object_unref(reaper);
return 0;
}
#endif
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