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-/* wrapper.c -- C code booting Guile
- Copyright © 2003, 2014 Dale Mellor <dale_mellor@users.sourceforge.net>
- Copyright © 2015, 2016, 2017 Mathieu Lirzin <mthl@gnu.org>
-
- This file is part of GNU Mcron.
-
- GNU Mcron 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 3 of the License, or
- (at your option) any later version.
-
- GNU Mcron 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 GNU Mcron. If not, see <http://www.gnu.org/licenses/>. */
-
-/* This C code represents a thin wrapper around the Guile code of Mcron. It
- is needed because the crontab personality requires SUID which is not
- permitted for executable scripts. */
-
-#include "utils.h"
-#include <libguile.h>
-#include <signal.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-/* Forward declarations. */
-static void inner_main (void *closure, int argc, char **argv);
-static void react_to_terminal_signal (int sig);
-static SCM set_cron_signals (void);
-
-int
-main (int argc, char **argv)
-{
- /* Set Guile load paths to ensure that Mcron modules will be found after
- installation. In a build environment let the 'pre-inst-env' script set
- the correct paths. */
- if (getenv ("MCRON_UNINSTALLED") == NULL)
- {
- wrap_env_path ("GUILE_LOAD_PATH", PACKAGE_LOAD_PATH);
- wrap_env_path ("GUILE_LOAD_COMPILED_PATH", PACKAGE_LOAD_COMPILED_PATH);
- }
-
- scm_boot_guile (argc, argv, inner_main, 0);
-
- return EXIT_SUCCESS;
-}
-
-/* Launch the Mcron Guile main program. */
-static void
-inner_main (void *closure, int argc, char **argv)
-{
- scm_set_current_module (scm_c_resolve_module ("mcron scripts " PROGRAM));
- /* Register the procedures to be called from Guile. */
- scm_c_define_gsubr ("c-set-cron-signals", 0, 0, 0, set_cron_signals);
- /* Call main procedure. */
- scm_call_0 (scm_variable_ref (scm_c_lookup ("main")));
-}
-
-/* Set up all the signal handlers as required by the cron personality. This
- is necessary to perform the signal processing in C because the sigaction
- function won't work when called from Guile. */
-static SCM
-set_cron_signals ()
-{
- static struct sigaction sa;
-
- memset (&sa, 0, sizeof (sa));
- sa.sa_handler = react_to_terminal_signal;
- sigaction (SIGTERM, &sa, 0);
- sigaction (SIGINT, &sa, 0);
- sigaction (SIGQUIT, &sa, 0);
- sigaction (SIGHUP, &sa, 0);
-
- return SCM_BOOL_T;
-}
-
-/* Handle signal SIG and exit. All signals that mcron handles will produce
- the same behavior so we don't need to use SIG in the implementation. */
-static void
-react_to_terminal_signal (int sig)
-{
- scm_c_eval_string ("(delete-run-file)");
- exit (EXIT_FAILURE);
-}