aboutsummaryrefslogtreecommitdiffstats
path: root/lcd4linux.c
diff options
context:
space:
mode:
Diffstat (limited to 'lcd4linux.c')
-rw-r--r--lcd4linux.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/lcd4linux.c b/lcd4linux.c
new file mode 100644
index 0000000..842f653
--- /dev/null
+++ b/lcd4linux.c
@@ -0,0 +1,440 @@
+/* $Id: lcd4linux.c 1106 2010-02-07 14:03:46Z mzuther $
+ * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/lcd4linux.c $
+ *
+ * LCD4Linux
+ *
+ * Copyright (C) 1999, 2000, 2001, 2002, 2003 Michael Reinelt <michael@reinelt.co.at>
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 "timer_group.h"
+#include "layout.h"
+#include "plugin.h"
+#include "thread.h"
+#include "event.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, 2008, 2009 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 and plugins\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");
+#ifdef WITH_X11
+ printf("special X11 options:\n");
+ printf(" -display <X11 display name> preceeds X connection given in $DISPLAY\n");
+ printf(" -synchronous use synchronized communication with X server (for debugging)\n");
+ printf("\n");
+ printf("\n");
+ printf("\n");
+#endif
+}
+
+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 list_mode = 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;
+
+#ifdef WITH_X11
+ drv_X11_parseArgs(&argc, argv);
+ if (argc != thread_argc) {
+ /* info() will not work here because verbose level is not known */
+ printf("recognized special X11 parameters\n");
+ }
+#endif
+ 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':
+ list_mode++;
+ break;
+ 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;
+ }
+
+ if (list_mode > 0) {
+ printf("%s\n", release);
+ printf("%s\n", copyright);
+ printf("\n");
+ drv_list();
+ printf("\n");
+ plugin_list();
+ printf("\n");
+ exit(0);
+ }
+
+ info("%s starting", release);
+ 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) {
+ error("Error reading configuration. Exit!");
+ exit(1);
+ }
+
+ if (plugin_init() == -1) {
+ error("Error initializing plugins. Exit!");
+ 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) {
+ error("Error initializing driver %s: Exit!", driver);
+ 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;
+ event_process(&delay);
+ }
+
+ debug("leaving main loop");
+
+ drv_quit(quiet);
+ pid_exit(pidfile);
+ cfg_exit();
+ plugin_exit();
+ timer_exit_group();
+ 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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-10 06:58:02 +0000