summaryrefslogtreecommitdiffstats
path: root/src/vlib/unix/main.c
blob: c0e6770290fc6b433c3e61c5285e7d3e6cbbdf98 (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
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * main.c: Unix main routine
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlib/unix/plugin.h>

#include <signal.h>
#include <sys/ucontext.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>

/** Default CLI pager limit is not configured in startup.conf */
#define UNIX_CLI_DEFAULT_PAGER_LIMIT 100000

/** Default CLI history depth if not configured in startup.conf */
#define UNIX_CLI_DEFAULT_HISTORY 50

char *vlib_default_runtime_dir __attribute__ ((weak));
char *vlib_default_runtime_dir = "vlib";

unix_main_t unix_main;
clib_file_main_t file_main;

static clib_error_t *
unix_main_init (vlib_main_t * vm)
{
  unix_main_t *um = &unix_main;
  um->vlib_main = vm;
  return vlib_call_init_function (vm, unix_input_init);
}

VLIB_INIT_FUNCTION (unix_main_init);

static int
unsetup_signal_handlers (int sig)
{
  struct sigaction sa;

  sa.sa_handler = SIG_DFL;
  sa.sa_flags = 0;
  sigemptyset (&sa.sa_mask);
  return sigaction (sig, &sa, 0);
}


/* allocate this buffer from mheap when setting up the signal handler.
    dangerous to vec_resize it when crashing, mheap itself might have been
    corruptted already */
static u8 *syslog_msg = 0;

static void
unix_signal_handler (int signum, siginfo_t * si, ucontext_t * uc)
{
  uword fatal = 0;

  syslog_msg = format (syslog_msg, "received signal %U, PC %U",
		       format_signal, signum, format_ucontext_pc, uc);

  if (signum == SIGSEGV)
    syslog_msg = format (syslog_msg, ", faulting address %p", si->si_addr);

  switch (signum)
    {
      /* these (caught) signals cause the application to exit */
    case SIGTERM:
      /*
       * Ignore SIGTERM if it's sent before we're ready.
       */
      if (unix_main.vlib_main && unix_main.vlib_main->main_loop_exit_set)
	{
	  syslog (LOG_ERR | LOG_DAEMON, "received SIGTERM, exiting...");
	  unix_main.vlib_main->main_loop_exit_now = 1;
	}
      else
	syslog (LOG_ERR | LOG_DAEMON, "IGNORE early SIGTERM...");
      break;
      /* fall through */
    case SIGQUIT:
    case SIGINT:
    case SIGILL:
    case SIGBUS:
    case SIGSEGV:
    case SIGHUP:
    case SIGFPE:
    case SIGABRT:
      fatal = 1;
      break;

      /* by default, print a message and continue */
    default:
      fatal = 0;
      break;
    }

  /* Null terminate. */
  vec_add1 (syslog_msg, 0);

  if (fatal)
    {
      syslog (LOG_ERR | LOG_DAEMON, "%s", syslog_msg);

      /* Address of callers: outer first, inner last. */
      uword callers[15];
      uword n_callers = clib_backtrace (callers, ARRAY_LEN (callers), 0);
      int i;
      for (i = 0; i < n_callers; i++)
	{
	  vec_reset_length (syslog_msg);

	  syslog_msg =
	    format (syslog_msg, "#%-2d 0x%016lx %U%c", i, callers[i],
		    format_clib_elf_symbol_with_address, callers[i], 0);

	  syslog (LOG_ERR | LOG_DAEMON, "%s", syslog_msg);
	}

      /* have to remove SIGABRT to avoid recusive - os_exit calling abort() */
      unsetup_signal_handlers (SIGABRT);

      os_exit (1);
    }
  else
    clib_warning ("%s", syslog_msg);

}

static clib_error_t *
setup_signal_handlers (unix_main_t * um)
{
  uword i;
  struct sigaction sa;

  /* give a big enough buffer for msg, most likely it can avoid vec_resize  */
  vec_alloc (syslog_msg, 2048);

  for (i = 1; i < 32; i++)
    {
      clib_memset (&sa, 0, sizeof (sa));
      sa.sa_sigaction = (void *) unix_signal_handler;
      sa.sa_flags = SA_SIGINFO;

      switch (i)
	{
	  /* these signals take the default action */
	case SIGKILL:
	case SIGSTOP:
	case SIGUSR1:
	case SIGUSR2:
	  continue;

	  /* ignore SIGPIPE, SIGCHLD */
	case SIGPIPE:
	case SIGCHLD:
	  sa.sa_sigaction = (void *) SIG_IGN;
	  break;

	  /* catch and handle all other signals */
	default:
	  break;
	}

      if (sigaction (i, &sa, 0) < 0)
	return clib_error_return_unix (0, "sigaction %U", format_signal, i);
    }

  return 0;
}

static void
unix_error_handler (void *arg, u8 * msg, int msg_len)
{
  unix_main_t *um = arg;

  /* Echo to stderr when interactive. */
  if (um->flags & UNIX_FLAG_INTERACTIVE)
    {
      CLIB_UNUSED (int r) = write (2, msg, msg_len);
    }
  else
    {
      char save = msg[msg_len - 1];

      /* Null Terminate. */
      msg[msg_len - 1] = 0;

      syslog (LOG_ERR | LOG_DAEMON, "%s", msg);

      msg[msg_len - 1] = save;
    }
}

void
vlib_unix_error_report (vlib_main_t * vm, clib_error_t * error)
{
  unix_main_t *um = &unix_main;

  if (um->flags & UNIX_FLAG_INTERACTIVE || error == 0)
    return;

  {
    char save;
    u8 *msg;
    u32 msg_len;

    msg = error->what;
    msg_len = vec_len (msg);

    /* Null Terminate. */
    save = msg[msg_len - 1];
    msg[msg_len - 1] = 0;

    syslog (LOG_ERR | LOG_DAEMON, "%s", msg);

    msg[msg_len - 1] = save;
  }
}

static uword
startup_config_process (vlib_main_t * vm,
			vlib_node_runtime_t * rt, vlib_frame_t * f)
{
  unix_main_t *um = &unix_main;
  u8 *buf = 0;
  uword l, n = 1;

  vlib_process_suspend (vm, 2.0);

  while (um->unix_config_complete == 0)
    vlib_process_suspend (vm, 0.1);

  if (um->startup_config_filename)
    {
      unformat_input_t sub_input;
      int fd;
      struct stat s;
      char *fn = (char *) um->startup_config_filename;

      fd = open (fn, O_RDONLY);
      if (fd < 0)
	{
	  clib_warning ("failed to open `%s'", fn);
	  return 0;
	}

      if (fstat (fd, &s) < 0)
	{
	  clib_warning ("failed to stat `%s'", fn);
	bail:
	  close (fd);
	  return 0;
	}

      if (!(S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
	{
	  clib_warning ("not a regular file: `%s'", fn);
	  goto bail;
	}

      while (n > 0)
	{
	  l = vec_len (buf);
	  vec_resize (buf, 4096);
	  n = read (fd, buf + l, 4096);
	  if (n > 0)
	    {
	      _vec_len (buf) = l + n;
	      if (n < 4096)
		break;
	    }
	  else
	    break;
	}
      if (um->log_fd && vec_len (buf))
	{
	  u8 *lv = 0;
	  lv = format (lv, "%U: ***** Startup Config *****\n%v",
		       format_timeval, 0 /* current bat-time */ ,
		       0 /* current bat-format */ ,
		       buf);
	  {
	    int rv __attribute__ ((unused)) =
	      write (um->log_fd, lv, vec_len (lv));
	  }
	  vec_reset_length (lv);
	  lv = format (lv, "%U: ***** End Startup Config *****\n",
		       format_timeval, 0 /* current bat-time */ ,
		       0 /* current bat-format */ );
	  {
	    int rv __attribute__ ((unused)) =
	      write (um->log_fd, lv, vec_len (lv));
	  }
	  vec_free (lv);
	}

      if (vec_len (buf))
	{
	  unformat_init_vector (&sub_input, buf);
	  vlib_cli_input (vm, &sub_input, 0, 0);
	  /* frees buf for us */
	  unformat_free (&sub_input);
	}
      close (fd);
    }
  return 0;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (startup_config_node,static) = {
    .function = startup_config_process,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "startup-config-process",
};
/* *INDENT-ON* */

static clib_error_t *
unix_config (vlib_main_t * vm, unformat_input_t * input)
{
  unix_main_t *um = &unix_main;
  clib_error_t *error = 0;
  gid_t gid;
  int pidfd = -1;

  /* Defaults */
  um->cli_pager_buffer_limit = UNIX_CLI_DEFAULT_PAGER_LIMIT;
  um->cli_history_limit = UNIX_CLI_DEFAULT_HISTORY;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      char *cli_prompt;
      if (unformat (input, "interactive"))
	um->flags |= UNIX_FLAG_INTERACTIVE;
      else if (unformat (input, "nodaemon"))
	um->flags |= UNIX_FLAG_NODAEMON;
      else if (unformat (input, "cli-prompt %s", &cli_prompt))
	vlib_unix_cli_set_prompt (cli_prompt);
      else
	if (unformat (input, "cli-listen %s", &um->cli_listen_socket.config))
	;
      else if (unformat (input, "runtime-dir %s", &um->runtime_dir))
	;
      else if (unformat (input, "cli-line-mode"))
	um->cli_line_mode = 1;
      else if (unformat (input, "cli-no-banner"))
	um->cli_no_banner = 1;
      else if (unformat (input, "cli-no-pager"))
	um->cli_no_pager = 1;
      else if (unformat (input, "poll-sleep-usec %d", &um->poll_sleep_usec))
	;
      else if (unformat (input, "cli-pager-buffer-limit %d",
			 &um->cli_pager_buffer_limit))
	;
      else
	if (unformat (input, "cli-history-limit %d", &um->cli_history_limit))
	;
      else if (unformat (input, "coredump-size"))
	{
	  uword coredump_size = 0;
	  if (unformat (input, "unlimited"))
	    {
	      coredump_size = RLIM_INFINITY;
	    }
	  else
	    if (!unformat (input, "%U", unformat_memory_size, &coredump_size))
	    {
	      return clib_error_return (0,
					"invalid coredump-size parameter `%U'",
					format_unformat_error, input);
	    }
	  const struct rlimit new_limit = { coredump_size, coredump_size };
	  if (0 != setrlimit (RLIMIT_CORE, &new_limit))
	    {
	      clib_unix_warning ("prlimit() failed");
	    }
	}
      else if (unformat (input, "full-coredump"))
	{
	  int fd;

	  fd = open ("/proc/self/coredump_filter", O_WRONLY);
	  if (fd >= 0)
	    {
	      if (write (fd, "0x6f\n", 5) != 5)
		clib_unix_warning ("coredump filter write failed!");
	      close (fd);
	    }
	  else
	    clib_unix_warning ("couldn't open /proc/self/coredump_filter");
	}
      else if (unformat (input, "startup-config %s",
			 &um->startup_config_filename))
	;
      else if (unformat (input, "exec %s", &um->startup_config_filename))
	;
      else if (unformat (input, "log %s", &um->log_filename))
	{
	  um->log_fd = open ((char *) um->log_filename,
			     O_CREAT | O_WRONLY | O_APPEND, 0644);
	  if (um->log_fd < 0)
	    {
	      clib_warning ("couldn't open log '%s'\n", um->log_filename);
	      um->log_fd = 0;
	    }
	  else
	    {
	      u8 *lv = 0;
	      lv = format (0, "%U: ***** Start: PID %d *****\n",
			   format_timeval, 0 /* current bat-time */ ,
			   0 /* current bat-format */ ,
			   getpid ());
	      {
		int rv __attribute__ ((unused)) =
		  write (um->log_fd, lv, vec_len (lv));
	      }
	      vec_free (lv);
	    }
	}
      else if (unformat (input, "gid %U", unformat_unix_gid, &gid))
	{
	  if (setegid (gid) == -1)
	    return clib_error_return_unix (0, "setegid");
	}
      else if (unformat (input, "pidfile %s", &um->pidfile))
	;
      else
	return clib_error_return (0, "unknown input `%U'",
				  format_unformat_error, input);
    }

  if (um->runtime_dir == 0)
    {
      uid_t uid = geteuid ();
      if (uid == 00)
	um->runtime_dir = format (0, "/run/%s%c",
				  vlib_default_runtime_dir, 0);
      else
	um->runtime_dir = format (0, "/run/user/%u/%s%c", uid,
				  vlib_default_runtime_dir, 0);
    }

  error = setup_signal_handlers (um);
  if (error)
    return error;

  if (um->pidfile)
    {
      if ((error = vlib_unix_validate_runtime_file (um,
						    (char *) um->pidfile,
						    &um->pidfile)))
	return error;

      if (((pidfd = open ((char *) um->pidfile,
			  O_CREAT | O_WRONLY | O_TRUNC, 0644)) < 0))
	{
	  return clib_error_return_unix (0, "open");
	}
    }

  if (!(um->flags & UNIX_FLAG_INTERACTIVE))
    {
      openlog (vm->name, LOG_CONS | LOG_PERROR | LOG_PID, LOG_DAEMON);
      clib_error_register_handler (unix_error_handler, um);

      if (!(um->flags & UNIX_FLAG_NODAEMON) && daemon ( /* chdir to / */ 0,
						       /* stdin/stdout/stderr -> /dev/null */
						       0) < 0)
	clib_error_return (0, "daemon () fails");
    }

  if (pidfd >= 0)
    {
      u8 *lv = format (0, "%d", getpid ());
      if (write (pidfd, (char *) lv, vec_len (lv)) != vec_len (lv))
	{
	  vec_free (lv);
	  close (pidfd);
	  return clib_error_return_unix (0, "write");
	}
      vec_free (lv);
      close (pidfd);
    }

  um->unix_config_complete = 1;

  return 0;
}

/* unix { ... } configuration. */
/*?
 *
 * @cfgcmd{interactive}
 * Attach CLI to stdin/out and provide a debugging command line interface.
 * Implies @c nodaemon.
 *
 * @cfgcmd{nodaemon}
 * Do not fork or background the VPP process. Typically used when invoking
 * VPP applications from a process monitor.
 *
 * @cfgcmd{exec, &lt;filename&gt;}
 * @par <code>startup-config &lt;filename&gt;</code>
 * Read startup operational configuration from @c filename.
 * The contents of the file will be performed as though entered at the CLI.
 * The two keywords are aliases for the same function; if both are specified,
 * only the last will have an effect.
 *
 * @cfgcmd{log, &lt;filename&gt;}
 * Logs the startup configuration and all subsequent CLI commands in
 * @c filename.
 * Very useful in situations where folks don't remember or can't be bothered
 * to include CLI commands in bug reports.
 *
 * @cfgcmd{pidfile, &lt;filename&gt;}
 * Writes the pid of the main thread in @c filename.
 *
 * @cfgcmd{full-coredump}
 * Ask the Linux kernel to dump all memory-mapped address regions, instead
 * of just text+data+bss.
 *
 * @cfgcmd{runtime-dir}
 * Define directory where VPP is going to store all runtime files.
 * Default is /run/vpp.
 *
 * @cfgcmd{cli-listen, &lt;address:port&gt;}
 * Bind the CLI to listen at the address and port given. @clocalhost
 * on TCP port @c 5002, given as <tt>cli-listen localhost:5002</tt>,
 * is typical.
 *
 * @cfgcmd{cli-line-mode}
 * Disable character-by-character I/O on stdin. Useful when combined with,
 * for example, <tt>emacs M-x gud-gdb</tt>.
 *
 * @cfgcmd{cli-prompt, &lt;string&gt;}
 * Configure the CLI prompt to be @c string.
 *
 * @cfgcmd{cli-history-limit, &lt;nn&gt;}
 * Limit commmand history to @c nn  lines. A value of @c 0
 * disables command history. Default value: @c 50
 *
 * @cfgcmd{cli-no-banner}
 * Disable the login banner on stdin and Telnet connections.
 *
 * @cfgcmd{cli-no-pager}
 * Disable the output pager.
 *
 * @cfgcmd{cli-pager-buffer-limit, &lt;nn&gt;}
 * Limit pager buffer to @c nn lines of output.
 * A value of @c 0 disables the pager. Default value: @c 100000
?*/
VLIB_EARLY_CONFIG_FUNCTION (unix_config, "unix");

static clib_error_t *
unix_exit (vlib_main_t * vm)
{
  /* Close syslog connection. */
  closelog ();
  return 0;
}

VLIB_MAIN_LOOP_EXIT_FUNCTION (unix_exit);

u8 **vlib_thread_stacks;

static uword
thread0 (uword arg)
{
  vlib_main_t *vm = (vlib_main_t *) arg;
  unformat_input_t input;
  int i;

  unformat_init_command_line (&input, (char **) vm->argv);
  i = vlib_main (vm, &input);
  unformat_free (&input);

  return i;
}

u8 *
vlib_thread_stack_init (uword thread_index)
{
  vec_validate (vlib_thread_stacks, thread_index);
  vlib_thread_stacks[thread_index] = clib_mem_alloc_aligned
    (VLIB_THREAD_STACK_SIZE, VLIB_THREAD_STACK_SIZE);

  /*
   * Disallow writes to the bottom page of the stack, to
   * catch stack overflows.
   */
  if (mprotect (vlib_thread_stacks[thread_index],
		clib_mem_get_page_size (), PROT_READ) < 0)
    clib_unix_warning ("thread stack");
  return vlib_thread_stacks[thread_index];
}

int
vlib_unix_main (int argc, char *argv[])
{
  vlib_main_t *vm = &vlib_global_main;	/* one and only time for this! */
  unformat_input_t input;
  clib_error_t *e;
  int i;

  vm->argv = (u8 **) argv;
  vm->name = argv[0];
  vm->heap_base = clib_mem_get_heap ();
  vm->heap_aligned_base = (void *)
    (((uword) vm->heap_base) & ~(VLIB_FRAME_ALIGN - 1));
  ASSERT (vm->heap_base);

  unformat_init_command_line (&input, (char **) vm->argv);
  if ((e = vlib_plugin_config (vm, &input)))
    {
      clib_error_report (e);
      return 1;
    }
  unformat_free (&input);

  i = vlib_plugin_early_init (vm);
  if (i)
    return i;

  unformat_init_command_line (&input, (char **) vm->argv);
  if (vm->init_functions_called == 0)
    vm->init_functions_called = hash_create (0, /* value bytes */ 0);
  e = vlib_call_all_config_functions (vm, &input, 1 /* early */ );
  if (e != 0)
    {
      clib_error_report (e);
      return 1;
    }
  unformat_free (&input);

  /* always load symbols, for signal handler and mheap memory get/put backtrace */
  clib_elf_main_init (vm->name);

  vlib_thread_stack_init (0);

  __os_thread_index = 0;
  vm->thread_index = 0;

  i = clib_calljmp (thread0, (uword) vm,
		    (void *) (vlib_thread_stacks[0] +
			      VLIB_THREAD_STACK_SIZE));
  return i;
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */