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/* $calcurse: dmon.c,v 1.7 2009/07/27 21:02:55 culot Exp $ */
/*
* Calcurse - text-based organizer
*
* Copyright (c) 2009 Frederic Culot <frederic@culot.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Send your feedback or comments to : calcurse@culot.org
* Calcurse home page : http://culot.org/calcurse
*
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <paths.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include "utils.h"
#include "i18n.h"
#include "sigs.h"
#include "mem.h"
#include "io.h"
#include "custom.h"
#include "notify.h"
#include "dmon.h"
#define DMON_SLEEP_TIME 60
#define DMON_LOG(...) do { \
(void)io_fprintln (path_dmon_log, __VA_ARGS__); \
} while (0)
#define DMON_ABRT(...) do { \
DMON_LOG (__VA_ARGS__); \
if (kill (getpid (), SIGINT) < 0) \
{ \
DMON_LOG (_("Could not stop daemon properly: %s\n"), \
strerror (errno)); \
exit (EXIT_FAILURE); \
} \
} while (0)
static unsigned data_loaded;
static void
dmon_sigs_hdlr (int sig)
{
if (data_loaded)
free_user_data ();
DMON_LOG (_("terminated at %s with signal %d\n"), nowstr (), sig);
if (unlink (path_dpid) != 0)
{
DMON_LOG (_("Could not remove daemon lock file: %s\n"),
strerror (errno));
exit (EXIT_FAILURE);
}
exit (EXIT_SUCCESS);
}
static unsigned
daemonize (int status)
{
int fd;
/*
* Operate in the background: Daemonizing.
*
* First need to fork in order to become a child of the init process,
* once the father exits.
*/
switch (fork ())
{
case -1: /* fork error */
EXIT (_("Could not fork: %s\n"), strerror (errno));
break;
case 0: /* child */
break;
default: /* parent */
exit (status);
}
/*
* Process independency.
*
* Obtain a new process group and session in order to get detached from the
* controlling terminal.
*/
if (setsid () == -1)
{
DMON_LOG (_("Could not detach from the controlling terminal: %s\n"),
strerror (errno));
return 0;
}
/*
* Change working directory to root directory,
* to prevent filesystem unmounts.
*/
if (chdir ("/") == -1)
{
DMON_LOG (_("Could not change working directory: %s\n"),
strerror (errno));
return 0;
}
/* Redirect standard file descriptors to /dev/null. */
if ((fd = open (_PATH_DEVNULL, O_RDWR, 0)) != -1)
{
(void)dup2 (fd, STDIN_FILENO);
(void)dup2 (fd, STDOUT_FILENO);
(void)dup2 (fd, STDERR_FILENO);
if (fd > 2)
(void)close (fd);
}
/* Write access for the owner only. */
(void)umask (0022);
if (!sigs_set_hdlr (SIGINT, dmon_sigs_hdlr)
|| !sigs_set_hdlr (SIGTERM, dmon_sigs_hdlr)
|| !sigs_set_hdlr (SIGALRM, dmon_sigs_hdlr)
|| !sigs_set_hdlr (SIGQUIT, dmon_sigs_hdlr)
|| !sigs_set_hdlr (SIGCHLD, SIG_IGN))
return 0;
return 1;
}
void
dmon_start (int parent_exit_status)
{
conf_t conf;
if (!daemonize (parent_exit_status))
DMON_ABRT (_("Cannot daemonize, aborting\n"));
if (!io_dump_pid (path_dpid))
DMON_ABRT (_("Could not set lock file\n"));
if (!io_file_exist (path_conf))
DMON_ABRT (_("Could not access \"%s\": %s\n"),
path_conf, strerror (errno));
custom_load_conf (&conf, 0);
if (!io_file_exist (path_apts))
DMON_ABRT (_("Could not access \"%s\": %s\n"),
path_apts, strerror (errno));
apoint_llist_init ();
recur_apoint_llist_init ();
io_load_app ();
data_loaded = 1;
for (;;)
{
struct notify_app_s next;
(void)notify_get_next (&next);
if (next.got_app)
{
int left;
notify_update_app (next.time, next.state, next.txt);
left = notify_time_left ();
if (left < nbar.cntdwn)
notify_launch_cmd ();
}
if (next.txt)
mem_free (next.txt);
DMON_LOG (_("sleeping at %s for %d seconds\n"), nowstr (),
DMON_SLEEP_TIME);
psleep (DMON_SLEEP_TIME);
DMON_LOG (_("awakened at %s\n"), nowstr ());
}
}
/*
* Check if calcurse is running in background, and if yes, send a SIGINT
* signal to stop it.
*/
void
dmon_stop (void)
{
int dpid;
dpid = io_get_pid (path_dpid);
if (!dpid)
return;
if (kill ((pid_t)dpid, SIGINT) < 0)
EXIT (_("Could not stop calcurse daemon: %s\n"), strerror (errno));
}
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