aboutsummaryrefslogtreecommitdiffstats
path: root/lcd4linux.c
blob: ee44cb5c9c33b90f5ae00c514dcbeb18ce4458ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
/* $Id: lcd4linux.c,v 1.42 2003/08/14 03:47:40 reinelt Exp $
 *
 * LCD4Linux
 *
 * Copyright 1999-2003 Michael Reinelt (reinelt@eunet.at)
 *
 * This program 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.
 *
 * This program 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.
 *
 *
 * $Log: lcd4linux.c,v $
 * Revision 1.42  2003/08/14 03:47:40  reinelt
 * remove PID file if driver initialisation fails
 *
 * Revision 1.41  2003/08/08 08:05:23  reinelt
 * added PID file handling
 *
 * Revision 1.40  2003/08/08 06:58:06  reinelt
 * improved forking
 *
 * Revision 1.39  2003/07/24 04:48:09  reinelt
 * 'soft clear' needed for virtual rows
 *
 * Revision 1.38  2003/06/13 05:11:11  reinelt
 * error message cosmetics
 *
 * Revision 1.37  2003/04/07 06:03:01  reinelt
 * further parallel port abstraction
 *
 * Revision 1.36  2003/02/22 07:53:10  reinelt
 * cfg_get(key,defval)
 *
 * Revision 1.35  2003/02/13 10:40:17  reinelt
 *
 * changed "copyright" to "2003"
 * added slightly different protocol for MatrixOrbital "LK202" displays
 *
 * Revision 1.34  2002/04/29 11:00:28  reinelt
 *
 * added Toshiba T6963 driver
 * added ndelay() with nanosecond resolution
 *
 * Revision 1.33  2001/04/27 05:04:57  reinelt
 *
 * replaced OPEN_MAX with sysconf()
 * replaced mktemp() with mkstemp()
 * unlock serial port if open() fails
 *
 * Revision 1.32  2001/03/13 07:41:22  reinelt
 *
 * added NEWS file
 *
 * Revision 1.31  2001/03/12 12:39:36  reinelt
 *
 * reworked autoconf a lot: drivers may be excluded, #define's went to config.h
 *
 * Revision 1.30  2001/03/08 15:25:38  ltoetsch
 * improved exec
 *
 * Revision 1.29  2001/02/14 07:40:16  reinelt
 *
 * first (incomplete) GPO implementation
 *
 * Revision 1.28  2000/10/25 08:10:48  reinelt
 *
 * added restart funnctionality
 * (lots of this code was stolen from sendmail.c)
 *
 * Revision 1.27  2000/08/10 18:42:20  reinelt
 *
 * fixed some bugs with the new syslog code
 *
 * Revision 1.26  2000/08/10 09:44:09  reinelt
 *
 * new debugging scheme: error(), info(), debug()
 * uses syslog if in daemon mode
 *
 * Revision 1.25  2000/08/09 14:14:11  reinelt
 *
 * new switch -F (do not fork)
 * added automatic forking if -F not specified
 *
 * Revision 1.24  2000/08/09 09:50:29  reinelt
 *
 * opened 0.98 development
 * removed driver-specific signal-handlers
 * added 'quit'-function to driver structure
 * added global signal-handler
 *
 * Revision 1.23  2000/04/17 05:14:27  reinelt
 *
 * added README.44780
 *
 * Revision 1.22  2000/04/15 16:56:52  reinelt
 *
 * moved delay loops to udelay.c
 * renamed -d (debugging) switch to -v (verbose)
 * new switch -d to calibrate delay loop
 * 'Delay' entry for HD44780 back again
 * delay loops will not calibrate automatically, because this will fail with hich CPU load
 *
 * Revision 1.21  2000/04/15 11:56:35  reinelt
 *
 * more debug messages
 *
 * Revision 1.20  2000/04/15 11:13:54  reinelt
 *
 * added '-d' (debugging) switch
 * added several debugging messages
 * removed config entry 'Delay' for HD44780 driver
 * delay loop for HD44780 will be calibrated automatically
 *
 * Revision 1.19  2000/04/10 04:40:53  reinelt
 *
 * minor changes and cleanups
 *
 * Revision 1.18  2000/04/07 05:42:20  reinelt
 *
 * UUCP style lockfiles for the serial port
 *
 * Revision 1.17  2000/04/03 17:31:52  reinelt
 *
 * suppress welcome message if display is smaller than 20x2
 * change lcd4linux.ppm to 32 pixel high so KDE won't stretch the icon
 *
 * Revision 1.16  2000/04/03 04:46:38  reinelt
 *
 * added '-c key=val' option
 *
 * Revision 1.15  2000/04/01 22:40:42  herp
 * geometric correction (too many pixelgaps)
 * lcd4linux main should return int, not void
 *
 * Revision 1.14  2000/03/26 18:46:28  reinelt
 *
 * bug in pixmap.c that leaded to empty bars fixed
 * name conflicts with X11 resolved
 *
 * Revision 1.13  2000/03/26 12:55:03  reinelt
 *
 * enhancements to the PPM driver
 *
 * Revision 1.12  2000/03/25 05:50:43  reinelt
 *
 * memory leak in Raster_flush closed
 * driver family logic changed
 *
 * Revision 1.11  2000/03/24 11:36:56  reinelt
 *
 * new syntax for raster configuration
 * changed XRES and YRES to be configurable
 * PPM driver works nice
 *
 * Revision 1.10  2000/03/23 07:24:48  reinelt
 *
 * PPM driver up and running (but slow!)
 *
 * Revision 1.9  2000/03/22 15:36:21  reinelt
 *
 * added '-l' switch (list drivers)
 * generic pixmap driver added
 * X11 Framework done
 *
 * Revision 1.8  2000/03/22 07:33:50  reinelt
 *
 * FAQ added
 * new modules 'processor.c' contains all data processing
 *
 * Revision 1.7  2000/03/19 08:41:28  reinelt
 *
 * documentation available! README, README.MatrixOrbital, README.Drivers
 * added Skeleton.c as a starting point for new drivers
 *
 * Revision 1.6  2000/03/18 10:31:06  reinelt
 *
 * added sensor handling (for temperature etc.)
 * made data collecting happen only if data is used
 * (reading /proc/meminfo takes a lot of CPU!)
 * released lcd4linux-0.92
 *
 * Revision 1.5  2000/03/18 08:07:04  reinelt
 *
 * vertical bars implemented
 * bar compaction improved
 * memory information implemented
 *
 * Revision 1.4  2000/03/17 09:21:42  reinelt
 *
 * various memory statistics added
 *
 * Revision 1.3  2000/03/13 15:58:24  reinelt
 *
 * release 0.9
 * moved row parsing to parser.c
 * all basic work finished
 *
 * Revision 1.2  2000/03/10 17:36:02  reinelt
 *
 * first unstable but running release
 *
 */

#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 "cfg.h"
#include "debug.h"
#include "pid.h"
#include "udelay.h"
#include "display.h"
#include "processor.h"

#define PIDFILE "/var/run/lcd4linux.pid"

char *release="LCD4Linux " VERSION " (c) 2003 Michael Reinelt <reinelt@eunet.at>";
char **my_argv;
char *output=NULL;
int got_signal=0;
int debugging=0;
int foreground=0;
int background=0;
int tick, tack;

static void usage(void)
{
  printf ("%s\n", release);
  printf ("usage: lcd4linux [-h]\n");
  printf ("       lcd4linux [-l]\n");
#ifdef USE_OLD_UDELAY
  printf ("       lcd4linux [-d]\n");
#endif
  printf ("       lcd4linux [-c key=value] [-F] [-f config-file] [-o output-file] [-q] [-v]\n");
}

int hello (void)
{
  int i, x, y, flag;
  char *line1[] = { "* LCD4Linux " VERSION " *",
		    "LCD4Linux " VERSION,
		    "LCD4Linux",
		    "L4Linux",
		    NULL };
  
  char *line2[] = { "(c) 2003 M.Reinelt",
		    "(c) M.Reinelt",
		    NULL };
  
  lcd_query (&y, &x, NULL, NULL, NULL, NULL);
  
  flag=0;
  for (i=0; line1[i]; i++) {
    if (strlen(line1[i])<=x) {
      lcd_put (1, (x-strlen(line1[i]))/2+1, line1[i]);
      flag=1;
      break;
    }
  }
  
  for (i=0; line2[i]; i++) {
    if (strlen(line2[i])<=x) {
      lcd_put (2, (x-strlen(line2[i]))/2+1, line2[i]);
      flag=1;
      break;
    }
  }
  
  if (flag) lcd_flush();
  return flag;
}

#ifdef USE_OLD_UDELAY
void calibrate (void)
{
  int i;
  unsigned long max=0;

  printf ("%s\n", release);
  printf ("calibrating delay loop:");
  fflush(stdout);
  for (i=0; i<10; i++) {
    udelay_calibrate();
    if (loops_per_usec>max)
      max=loops_per_usec;
  }
  printf (" Delay=%ld\n", max);
}
#endif

void handler (int signal)
{
  debug ("got signal %d", signal);
  got_signal=signal;
}

int main (int argc, char *argv[])
{
  char *cfg="/etc/lcd4linux.conf";
  char *driver;
  int c, smooth;
  int quiet=0;
  
  // 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;

#ifdef USE_OLD_UDELAY
  while ((c=getopt (argc, argv, "c:dFf:hlo:qv"))!=EOF) {
#else
  while ((c=getopt (argc, argv, "c:dFf:hlo:qv"))!=EOF) {
#endif
    switch (c) {
    case 'c':
      if (cfg_cmd (optarg)<0) {
	fprintf (stderr, "%s: illegal argument -c %s\n", argv[0], optarg);
	exit(2);
      }
      break;
    case 'd':
#ifdef USE_OLD_UDELAY
      calibrate();
      exit(0);
#else
      fprintf (stderr, "delay calibration no longer supported!\n");
      exit(1);
#endif
    case 'F':
      foreground++;
      break;
    case 'f':
      cfg=optarg;
      break;
    case 'h':
      usage();
      exit(0);
    case 'l':
      printf ("%s\n", release);
      lcd_list();
      exit(0);
    case 'o':
      output=optarg;
      break;
    case 'q':
      quiet++;
      break;
    case 'v':
      debugging++;
      break;
    default:
      exit(2);
    }
  }

  if (optind < argc) {
    fprintf (stderr, "%s: illegal option %s\n", argv[0], argv[optind]);
    exit(2);
  }

  info ("Version " VERSION " starting");
  if (!foreground && (my_argv[0]==NULL || my_argv[0][0]!='/')) {
    info ("invoked without full path; restart may not work!");
  }
  
  // set default values
  cfg_set ("row1", "*** %o %v ***");
  cfg_set ("row2", "%p CPU  %r MB RAM");
  cfg_set ("row3", "Busy %cu%% $r10cu");
  cfg_set ("row4", "Load %l1%L$r10l1");

  if (cfg_read (cfg)==-1)
    exit (1);
  
  driver=cfg_get("display",NULL);
  if (driver==NULL || *driver=='\0') {
    error ("missing 'display' entry in %s!", cfg_file());
    exit (1);
  }
  
  if (!foreground) {
    pid_t i;
    int fd;
    debug ("going background...");
    i=fork();
    if (i<0) {
      error ("fork() failed: %s", strerror(errno));
      exit (1);
    }
    if (i!=0) exit (0);
    
    // ignore nasty signals
    signal(SIGINT,  SIG_IGN);
    signal(SIGQUIT, SIG_IGN);

    // chdir("/")
    if (chdir("/")!=0) {
      error ("chdir(\"/\") failed: %s", strerror(errno));
      exit (1);
    }
    
    // we want full control over permissions
    umask (0);
    
    // 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);
    fflush(stderr);
    dup2(fd, STDOUT_FILENO);
    dup2(fd, STDERR_FILENO);
    close(fd);

    // create PID file
    if (pid_init(PIDFILE)!=0) {
      error ("PID file creation failed!");
      exit (1);
    }

    // now we are a daemon
    background=1;
  }
  
  debug ("initializing driver %s", driver);
  if (lcd_init(driver)==-1) {
    pid_exit(PIDFILE);
    exit (1);
  }

  // now install our own signal handler
  signal(SIGHUP,  handler);
  signal(SIGINT,  handler);
  signal(SIGQUIT, handler);
  signal(SIGTERM, handler);
  
  tick=atoi(cfg_get("tick","100"));
  tack=atoi(cfg_get("tack","500"));

  process_init();
  lcd_clear(1);

  if (!quiet && hello()) {
    sleep (3);
    lcd_clear(1);
  }
  
  debug ("starting main loop");

  smooth=0;
  while (got_signal==0) {
    process (smooth);
    smooth+=tick;
    if (smooth>tack) smooth=0;
    usleep(tick*1000);
  }

  debug ("leaving main loop");
  
  lcd_clear(1);
  if (!quiet) hello();
  lcd_quit();
  
  pid_exit(PIDFILE);
  
  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);
  }
  exit (0);
}