Replace generic C wrapper with individual programs

* src/wrapper.c: Delete.
* src/crontab.c: New file.
* src/mcron.c: Likewise.
* src/cron.c: Likewise.
* configure.ac: Adapt 'AC_CONFIG_DIR' to use "src/mcron.c".
* Makefile.am (bin_crontab_SOURCES, bin_cron_SOURCES)
(bin_mcron_SOURCES): Use new files.
(bin_cron_CPPFLAGS, bin_mcron_CPPFLAGS, bin_crontab_CPPFLAGS): Delete.

1 files changed, 80 insertions, 0 deletions

diff --git a/src/cron.c b/src/cron.c
new file mode 100644
index 0000000..55bcaaf
--- /dev/null
+++ b/src/cron.c
@@ -0,0 +1,80 @@
+/* cron.c -- run jobs at scheduled times
+   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/>.  */
+
+#include "utils.h"
+#include <libguile.h>
+#include <signal.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, NULL);
+
+  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 cron"));
+  scm_c_define_gsubr ("c-set-cron-signals", 0, 0, 0, set_cron_signals);
+  scm_call_0 (scm_variable_ref (scm_c_lookup ("main")));
+}
+
+/* Set up all the signal handlers.  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 cron 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);
+}