79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/* mcron - run jobs at scheduled times
|
|
|
|
Copyright (C) 2015, 2016 Mathieu Lirzin
|
|
Copyright (C) 2003, 2014 Dale Mellor
|
|
|
|
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 <libguile.h>
|
|
#include <signal.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)
|
|
{
|
|
setenv ("GUILE_LOAD_PATH", GUILE_LOAD_PATH, 1);
|
|
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 main"));
|
|
/* Register set_cron_signals to be called from Guile. */
|
|
scm_c_define_gsubr ("c-set-cron-signals", 0, 0, 0, set_cron_signals);
|
|
scm_c_eval_string ("(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);
|
|
}
|