diff options
Diffstat (limited to 'src/ck-run-programs.c')
| -rw-r--r-- | src/ck-run-programs.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/ck-run-programs.c b/src/ck-run-programs.c new file mode 100644 index 0000000..f9d62c7 --- /dev/null +++ b/src/ck-run-programs.c @@ -0,0 +1,230 @@ +/* -*- 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->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]); + } +out: + g_strfreev (env_for_child); +} |