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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2007 David Zeuthen <david@fubar.dk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <signal.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <glib/gstdio.h>
#include "ck-run-programs.h"
/* The number of wall-clock seconds a program is allowed to run before we kill it */
#define TIMEOUT_SECONDS 15
/* Guaranteed by POSIX; see 'man environ' for details */
extern char **environ;
typedef struct {
int refcount;
char *path;
gboolean child_is_running;
guint watch_id;
guint timeout_id;
GPid pid;
} ChildData;
static ChildData *
_child_data_new (void)
{
ChildData *cd;
cd = g_new0 (ChildData, 1);
cd->refcount = 1;
g_debug ("Allocated ChildData %p", cd);
return cd;
}
static ChildData *
_child_data_ref (ChildData *cd)
{
cd->refcount++;
return cd;
}
static void
_child_data_unref (ChildData *cd)
{
cd->refcount--;
if (cd->refcount == 0) {
g_free (cd->path);
g_free (cd);
g_debug ("Freeing ChildData %p", cd);
}
}
static void
_child_watch (GPid pid,
int status,
ChildData *cd)
{
g_debug ("In _child_watch for pid %d", pid);
g_spawn_close_pid (pid);
g_source_remove (cd->timeout_id);
cd->timeout_id = 0;
cd->child_is_running = FALSE;
_child_data_unref (cd);
}
static gboolean
_child_timeout (ChildData *cd)
{
/* The program we ran timed out; this is a bug in the program */
g_warning ("The program %s didn't exit within %d seconds; killing it", cd->path, TIMEOUT_SECONDS);
kill (cd->pid, SIGTERM);
cd->child_is_running = FALSE;
return FALSE;
}
/**
* ck_run_programs:
* @dirpath: Path to a directory containing programs to run
* @action: Argument to pass to each program
* @extra_env: Extra environment to pass
*
* Synchronously run all scripts with suffix .ck in the given
* directory.
*/
void
ck_run_programs (const char *dirpath,
const char *action,
char **extra_env)
{
GDir *dir;
GError *error;
const char *name;
char **env_for_child;
int environ_len;
int extra_env_len;
int n;
int m;
g_return_if_fail (dirpath != NULL);
g_return_if_fail (action != NULL);
g_debug ("Running programs in %s for action %s", dirpath, action);
/* Construct an environment consisting of the existing and the given environment */
environ_len = environ != NULL ? g_strv_length (environ) : 0;
extra_env_len = extra_env != NULL ? g_strv_length (extra_env) : 0;
env_for_child = g_new0 (char *, environ_len + extra_env_len + 2);
m = 0;
for (n = 0; n < environ_len; n++) {
env_for_child [m++] = g_strdup (environ[n]);
}
for (n = 0; n < extra_env_len; n++) {
env_for_child [m++] = g_strdup (extra_env[n]);
}
env_for_child[m] = NULL;
error = NULL;
dir = g_dir_open (dirpath, 0, &error);
if (dir == NULL) {
/* This is unexpected; it means ConsoleKit isn't properly installed */
g_warning ("Unable to open directory %s: %s", dirpath, error->message);
g_error_free (error);
goto out;
}
while ((name = g_dir_read_name (dir)) != NULL) {
char *child_argv[3];
ChildData *cd;
gboolean res;
if (!g_str_has_suffix (name, ".ck"))
continue;
child_argv[0] = g_strdup_printf ("%s/%s", dirpath, name);
child_argv[1] = (char *) action;
child_argv[2] = NULL;
error = NULL;
cd = _child_data_new ();
cd->path = g_strdup (child_argv[0]);
/* The ChildData instance is also unreffed in _child_watch; we only ref
* it here to prevent cd from being destroyed while checking it in
* the mainloop
*/
_child_data_ref (cd);
res = g_spawn_async (NULL,
child_argv,
env_for_child,
G_SPAWN_DO_NOT_REAP_CHILD,
NULL,
NULL,
&cd->pid,
&error);
if (! res) {
/* This is unexpected; it means the program to run isn't installed correctly */
g_warning ("Unable to spawn %s: %s", child_argv[0], error->message);
g_error_free (error);
_child_data_unref (cd);
_child_data_unref (cd);
goto out_loop;
}
cd->child_is_running = TRUE;
g_debug ("Waiting for child with pid %d", cd->pid);
cd->watch_id = g_child_watch_add (cd->pid,
(GChildWatchFunc)_child_watch,
cd);
cd->timeout_id = g_timeout_add (TIMEOUT_SECONDS * 1000,
(GSourceFunc)_child_timeout,
cd);
/* run the mainloop; this allows the main daemon to
* continue serving clients (including the program we
* just launched) */
while (cd->child_is_running) {
g_main_context_iteration (NULL, TRUE);
}
g_debug ("Done waiting for child with pid %d", cd->pid);
_child_data_unref (cd);
out_loop:
g_free (child_argv[0]);
}
g_dir_close (dir);
out:
g_strfreev (env_for_child);
}
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