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/* $Id$
* $URL$
* $URL$
*
* LCD4Linux
*
* Copyright (C) 1999, 2000, 2001, 2002, 2003 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004, 2005, 2006, 2007 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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, or (at your option)
* any later version.
*
* LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h> /* umask() */
#include <sys/stat.h> /* umask() */
#include "svn_version.h"
#include "cfg.h"
#include "debug.h"
#include "qprintf.h"
#include "pid.h"
#include "udelay.h"
#include "drv.h"
#include "timer.h"
#include "layout.h"
#include "plugin.h"
#include "thread.h"
#include "widget.h"
#include "widget_timer.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
#define PIDFILE "/var/run/lcd4linux.pid"
static char *release = "LCD4Linux " VERSION "-" SVN_VERSION;
static char *copyright = "Copyright (C) 2005, 2006, 2007 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>";
static char **my_argv;
extern char *output;
int got_signal = 0;
static void usage(void)
{
printf("%s\n", release);
printf("%s\n", copyright);
printf("\n");
printf("usage:\n");
printf(" lcd4linux [-h]\n");
printf(" lcd4linux [-l]\n");
printf(" lcd4linux [-c key=value] [-i] [-f config-file] [-v] [-p pid-file]\n");
printf(" lcd4linux [-c key=value] [-F] [-f config-file] [-o output-file] [-q] [-v]\n");
printf("\n");
printf("options:\n");
printf(" -h help\n");
printf(" -l list available display drivers\n");
printf(" -c <key>=<value> overwrite entries from the config-file\n");
printf(" -i enter interactive mode (after display initialisation)\n");
printf(" -ii enter interactive mode (before display initialisation)\n");
printf(" -f <config-file> use configuration from <config-file> instead of /etc/lcd4linux.conf\n");
printf(" -v generate info messages\n");
printf(" -vv generate debugging messages\n");
printf(" -p <pid-file> specify a different pid-file location (default is /var/run/lcd4linux.pid)\n");
printf(" -F do not fork and detach (run in foreground)\n");
printf(" -o <output-file> write picture to file (raster driver only)\n");
printf(" -q suppress startup and exit splash screen\n");
}
static void interactive_mode(void)
{
char line[1024];
void *tree;
RESULT result = { 0, 0, 0, NULL };
printf("\neval> ");
for (fgets(line, sizeof(line), stdin); !feof(stdin); fgets(line, sizeof(line), stdin)) {
if (line[strlen(line) - 1] == '\n')
line[strlen(line) - 1] = '\0';
if (strlen(line) > 0) {
if (Compile(line, &tree) != -1) {
Eval(tree, &result);
if (result.type == R_NUMBER) {
printf("%g\n", R2N(&result));
} else if (result.type == R_STRING) {
printf("'%s'\n", R2S(&result));
} else if (result.type == (R_NUMBER | R_STRING)) {
printf("'%s' (%g)\n", R2S(&result), R2N(&result));
} else {
printf("internal error: unknown result type %d\n", result.type);
}
DelResult(&result);
}
DelTree(tree);
}
printf("eval> ");
}
printf("\n");
}
void handler(int signal)
{
debug("got signal %d", signal);
got_signal = signal;
}
static void daemonize(void)
{
/* thanks to Petri Damsten, we now follow the guidelines from the UNIX Programming FAQ */
/* 1.7 How do I get my program to act like a daemon? */
/* http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16 */
/* especially the double-fork solved the 'lcd4linux dying when called from init' problem */
pid_t i;
int fd;
/* Step 1: fork() so that the parent can exit */
i = fork();
if (i < 0) {
error("fork(#1) failed: %s", strerror(errno));
exit(1);
}
if (i != 0)
exit(0);
/* Step 2: setsid() to become a process group and session group leader */
setsid();
/* Step 3: fork() again so the parent (the session group leader) can exit */
i = fork();
if (i < 0) {
error("fork(#2) failed: %s", strerror(errno));
exit(1);
}
if (i != 0)
exit(0);
/* Step 4: chdir("/") to ensure that our process doesn't keep any directory in use */
if (chdir("/") != 0) {
error("chdir(\"/\") failed: %s", strerror(errno));
exit(1);
}
/* Step 5: umask(0) so that we have complete control over the permissions of anything we write */
umask(0);
/* Step 6: Establish new open descriptors for stdin, stdout and stderr */
/* detach stdin */
if (freopen("/dev/null", "r", stdin) == NULL) {
error("freopen (/dev/null) failed: %s", strerror(errno));
exit(1);
}
/* detach stdout and stderr */
fd = open("/dev/null", O_WRONLY, 0666);
if (fd == -1) {
error("open (/dev/null) failed: %s", strerror(errno));
exit(1);
}
fflush(stdout);
dup2(fd, STDOUT_FILENO);
fflush(stderr);
dup2(fd, STDERR_FILENO);
close(fd);
}
int main(int argc, char *argv[])
{
char *cfg = "/etc/lcd4linux.conf";
char *pidfile = PIDFILE;
char *display, *driver, *layout;
char section[32];
int c;
int quiet = 0;
int interactive = 0;
int pid;
/* save arguments for restart */
my_argv = malloc(sizeof(char *) * (argc + 1));
for (c = 0; c < argc; c++) {
my_argv[c] = strdup(argv[c]);
}
my_argv[c] = NULL;
/* save original arguments pointer for threads */
thread_argv = argv;
thread_argc = argc;
running_foreground = 0;
running_background = 0;
while ((c = getopt(argc, argv, "c:Ff:hilo:qvp:")) != EOF) {
switch (c) {
case 'c':
if (cfg_cmd(optarg) < 0) {
fprintf(stderr, "%s: illegal argument -c '%s'\n", argv[0], optarg);
exit(2);
}
break;
case 'F':
running_foreground++;
break;
case 'f':
cfg = optarg;
break;
case 'h':
usage();
exit(0);
case 'i':
interactive++;
break;
case 'l':
printf("%s\n", release);
printf("%s\n", copyright);
drv_list();
printf("\n");
plugin_list();
exit(0);
case 'o':
output = optarg;
break;
case 'q':
quiet++;
break;
case 'v':
verbose_level++;
break;
case 'p':
pidfile = optarg;
break;
default:
exit(2);
}
}
if (optind < argc) {
fprintf(stderr, "%s: illegal option %s\n", argv[0], argv[optind]);
exit(2);
}
/* do not fork in interactive mode */
if (interactive) {
running_foreground = 1;
}
info("Version " VERSION "-" SVN_VERSION " starting");
if (!running_foreground && (my_argv[0] == NULL || my_argv[0][0] != '/')) {
info("invoked without full path; restart may not work!");
}
if (cfg_init(cfg) == -1)
exit(1);
if (plugin_init() == -1)
exit(1);
display = cfg_get(NULL, "Display", NULL);
if (display == NULL || *display == '\0') {
error("missing 'Display' entry in %s!", cfg_source());
exit(1);
}
qprintf(section, sizeof(section), "Display:%s", display);
free(display);
driver = cfg_get(section, "Driver", NULL);
if (driver == NULL || *driver == '\0') {
error("missing '%s.Driver' entry in %s!", section, cfg_source());
exit(1);
}
if (!running_foreground) {
debug("going background...");
daemonize();
/* ignore nasty signals */
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
/* create PID file */
if ((pid = pid_init(pidfile)) != 0) {
error("lcd4linux already running as process %d", pid);
exit(1);
}
/* now we are a daemon */
running_background = 1;
}
/* go into interactive mode before display initialization */
if (interactive >= 2) {
interactive_mode();
pid_exit(pidfile);
cfg_exit();
exit(0);
}
/* check the conf to see if quiet startup is wanted */
if (!quiet) {
cfg_number(NULL, "Quiet", 0, 0, 1, &quiet);
}
debug("initializing driver %s", driver);
if (drv_init(section, driver, quiet) == -1) {
pid_exit(pidfile);
exit(1);
}
free(driver);
/* register timer widget */
widget_timer_register();
/* go into interactive mode (display has been initialized) */
if (interactive >= 1) {
interactive_mode();
drv_quit(quiet);
pid_exit(pidfile);
cfg_exit();
exit(0);
}
/* check for new-style layout */
layout = cfg_get(NULL, "Layout", NULL);
if (layout == NULL || *layout == '\0') {
error("missing 'Layout' entry in %s!", cfg_source());
exit(1);
}
layout_init(layout);
free(layout);
debug("starting main loop");
/* now install our own signal handler */
signal(SIGHUP, handler);
signal(SIGINT, handler);
signal(SIGQUIT, handler);
signal(SIGTERM, handler);
while (got_signal == 0) {
struct timespec delay;
if (timer_process(&delay) < 0)
break;
nanosleep(&delay, NULL);
}
debug("leaving main loop");
drv_quit(quiet);
pid_exit(pidfile);
cfg_exit();
plugin_exit();
timer_exit();
if (got_signal == SIGHUP) {
long fd;
debug("restarting...");
/* close all files on exec */
for (fd = sysconf(_SC_OPEN_MAX); fd > 2; fd--) {
int flag;
if ((flag = fcntl(fd, F_GETFD, 0)) != -1)
fcntl(fd, F_SETFD, flag | FD_CLOEXEC);
}
execv(my_argv[0], my_argv);
error("execv() failed: %s", strerror(errno));
exit(1);
}
for (c = 0; my_argv[c] != NULL; c++) {
free(my_argv[c]);
}
free(my_argv);
exit(0);
}
|