summaryrefslogtreecommitdiff
path: root/output.c
blob: 2e69c6d29beec7912ad29b8240e9947047d7cea3 (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
693
694
695
/* Output to stdout / stderr for GNU make
Copyright (C) 2013 Free Software Foundation, Inc.
This file is part of GNU Make.

GNU Make 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 3 of the License, or (at your option) any later
version.

GNU Make 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, see <http://www.gnu.org/licenses/>.  */

#include "makeint.h"
#include "job.h"

/* GNU make no longer supports pre-ANSI89 environments.  */

#include <assert.h>
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>

#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#else
# include <sys/file.h>
#endif

struct output *output_context = NULL;
static unsigned int stdio_traced = 0;

#define OUTPUT_NONE (-1)

#define OUTPUT_ISSET(_out) ((_out)->out >= 0 || (_out)->err >= 0)

/* I really want to move to gnulib.  However, this is a big undertaking
   especially for non-UNIX platforms: how to get bootstrapping to work, etc.
   I don't want to take the time to do it right now.  Use a hack to get a
   useful version of vsnprintf() for Windows.  */
#ifdef _MSC_VER
#define va_copy(_d, _s) ((_d) = (_s))
#define snprintf msc_vsnprintf
static int
msc_vsnprintf (char *str, size_t size, const char *format, va_list ap)
{
  int len = -1;

  if (size > 0)
    len = _vsnprintf_s (str, size, _TRUNCATE, format, ap);
  if (len == -1)
    len = _vscprintf (format, ap);

  return len;
}
#endif

/* Write a string to the current STDOUT or STDERR.  */
static void
_outputs (struct output *out, int is_err, const char *msg)
{
  if (! out || ! out->syncout)
    {
      FILE *f = is_err ? stderr : stdout;
      fputs (msg, f);
      fflush (f);
    }
  else
    {
      int fd = is_err ? out->err : out->out;
      int len = strlen (msg);
      int r;

      EINTRLOOP (r, lseek (fd, 0, SEEK_END));
      while (1)
        {
          EINTRLOOP (r, write (fd, msg, len));
          if (r == len)
            break;
          if (r <= 0)
            return;
          len -= r;
          msg += r;
        }
    }
}

/* Write a message indicating that we've just entered or
   left (according to ENTERING) the current directory.  */

static int
log_working_directory (struct output *out, int entering)
{
  static char *buf = NULL;
  static unsigned int len = 0;
  unsigned int need;
  const char *fmt;
  char *p;

  /* Get enough space for the longest possible output.  */
  need = strlen (program) + INTEGER_LENGTH + 2 + 1;
  if (starting_directory)
    need += strlen (starting_directory);

  /* Use entire sentences to give the translators a fighting chance.  */
  if (makelevel == 0)
    if (starting_directory == 0)
      if (entering)
        fmt = _("%s: Entering an unknown directory\n");
      else
        fmt = _("%s: Leaving an unknown directory\n");
    else
      if (entering)
        fmt = _("%s: Entering directory '%s'\n");
      else
        fmt = _("%s: Leaving directory '%s'\n");
  else
    if (starting_directory == 0)
      if (entering)
        fmt = _("%s[%u]: Entering an unknown directory\n");
      else
        fmt = _("%s[%u]: Leaving an unknown directory\n");
    else
      if (entering)
        fmt = _("%s[%u]: Entering directory '%s'\n");
      else
        fmt = _("%s[%u]: Leaving directory '%s'\n");

  need += strlen (fmt);

  if (need > len)
    {
      buf = xrealloc (buf, need);
      len = need;
    }

  p = buf;
  if (print_data_base_flag)
    {
      *(p++) = '#';
      *(p++) = ' ';
    }

  if (makelevel == 0)
    if (starting_directory == 0)
      sprintf (p, fmt , program);
    else
      sprintf (p, fmt, program, starting_directory);
  else if (starting_directory == 0)
    sprintf (p, fmt, program, makelevel);
  else
    sprintf (p, fmt, program, makelevel, starting_directory);

  _outputs (out, 0, buf);

  return 1;
}

/* Set a file descriptor to be in O_APPEND mode.
   If it fails, just ignore it.  */

static void
set_append_mode (int fd)
{
#if defined(F_GETFL) && defined(F_SETFL) && defined(O_APPEND)
  int flags = fcntl (fd, F_GETFL, 0);
  if (flags >= 0)
    fcntl (fd, F_SETFL, flags | O_APPEND);
#endif
}


#ifdef OUTPUT_SYNC

/* Semaphore for use in -j mode with output_sync. */
static sync_handle_t sync_handle = -1;

#define STREAM_OK(_s)       ((fcntl (fileno (_s), F_GETFD) != -1) || (errno != EBADF))

#define FD_NOT_EMPTY(_f)    ((_f) != OUTPUT_NONE && lseek ((_f), 0, SEEK_END) > 0)

/* Set up the sync handle.  Disables output_sync on error.  */
static int
sync_init ()
{
  int combined_output;

#ifdef WINDOWS32
  if ((!STREAM_OK (stdout) && !STREAM_OK (stderr))
      || (sync_handle = create_mutex ()) == -1)
    {
      perror_with_name ("output-sync suppressed: ", "stderr");
      output_sync = 0;
    }
  else
    {
      combined_output = same_stream (stdout, stderr);
      prepare_mutex_handle_string (sync_handle);
    }

#else
  if (STREAM_OK (stdout))
    {
      struct stat stbuf_o, stbuf_e;

      sync_handle = fileno (stdout);
      combined_output = (fstat (fileno (stdout), &stbuf_o) == 0
                         && fstat (fileno (stderr), &stbuf_e) == 0
                         && stbuf_o.st_dev == stbuf_e.st_dev
                         && stbuf_o.st_ino == stbuf_e.st_ino);
    }
  else if (STREAM_OK (stderr))
    sync_handle = fileno (stderr);
  else
    {
      perror_with_name ("output-sync suppressed: ", "stderr");
      output_sync = 0;
    }
#endif

  return combined_output;
}

/* Support routine for output_sync() */
static void
pump_from_tmp (int from, FILE *to)
{
  static char buffer[8192];

#ifdef WINDOWS32
  int prev_mode;

  /* "from" is opened by open_tmpfd, which does it in binary mode, so
     we need the mode of "to" to match that.  */
  prev_mode = _setmode (fileno (to), _O_BINARY);
#endif

  if (lseek (from, 0, SEEK_SET) == -1)
    perror ("lseek()");

  while (1)
    {
      int len;
      EINTRLOOP (len, read (from, buffer, sizeof (buffer)));
      if (len < 0)
        perror ("read()");
      if (len <= 0)
        break;
      if (fwrite (buffer, len, 1, to) < 1)
        perror ("fwrite()");
    }

#ifdef WINDOWS32
  /* Switch "to" back to its original mode, so that log messages by
     Make have the same EOL format as without --output-sync.  */
  _setmode (fileno (to), prev_mode);
#endif
}

/* Obtain the lock for writing output.  */
static void *
acquire_semaphore (void)
{
  static struct flock fl;

  fl.l_type = F_WRLCK;
  fl.l_whence = SEEK_SET;
  fl.l_start = 0;
  fl.l_len = 1;
  if (fcntl (sync_handle, F_SETLKW, &fl) != -1)
    return &fl;
  perror ("fcntl()");
  return NULL;
}

/* Release the lock for writing output.  */
static void
release_semaphore (void *sem)
{
  struct flock *flp = (struct flock *)sem;
  flp->l_type = F_UNLCK;
  if (fcntl (sync_handle, F_SETLKW, flp) == -1)
    perror ("fcntl()");
}

/* Returns a file descriptor to a temporary file.  The file is automatically
   closed/deleted on exit.  Don't use a FILE* stream.  */
int
output_tmpfd ()
{
  int fd = -1;
  FILE *tfile = tmpfile ();

  if (! tfile)
    pfatal_with_name ("tmpfile");

  /* Create a duplicate so we can close the stream.  */
  fd = dup (fileno (tfile));
  if (fd < 0)
    pfatal_with_name ("dup");

  fclose (tfile);

  set_append_mode (fd);

  return fd;
}

/* Adds file descriptors to the child structure to support output_sync; one
   for stdout and one for stderr as long as they are open.  If stdout and
   stderr share a device they can share a temp file too.
   Will reset output_sync on error.  */
static void
setup_tmpfile (struct output *out)
{
  /* Is make's stdout going to the same place as stderr?  */
  static int combined_output = -1;

  if (combined_output < 0)
    combined_output = sync_init ();

  if (STREAM_OK (stdout))
    {
      int fd = output_tmpfd ();
      if (fd < 0)
        goto error;
      CLOSE_ON_EXEC (fd);
      out->out = fd;
    }

  if (STREAM_OK (stderr))
    {
      if (out->out != OUTPUT_NONE && combined_output)
        out->err = out->out;
      else
        {
          int fd = output_tmpfd ();
          if (fd < 0)
            goto error;
          CLOSE_ON_EXEC (fd);
          out->err = fd;
        }
    }

  return;

  /* If we failed to create a temp file, disable output sync going forward.  */
 error:
  output_close (out);
  output_sync = 0;
}

/* Synchronize the output of jobs in -j mode to keep the results of
   each job together. This is done by holding the results in temp files,
   one for stdout and potentially another for stderr, and only releasing
   them to "real" stdout/stderr when a semaphore can be obtained. */

void
output_dump (struct output *out)
{
  int outfd_not_empty = FD_NOT_EMPTY (out->out);
  int errfd_not_empty = FD_NOT_EMPTY (out->err);

  if (outfd_not_empty || errfd_not_empty)
    {
      int traced = 0;

      /* Try to acquire the semaphore.  If it fails, dump the output
         unsynchronized; still better than silently discarding it.  */
      void *sem = acquire_semaphore ();

      /* Log the working directory for this dump.  */
      if (print_directory_flag && output_sync != OUTPUT_SYNC_RECURSE)
        traced = log_working_directory (output_context, 1);

      /* We've entered the "critical section" during which a lock is held.  We
         want to keep it as short as possible.  */
      if (outfd_not_empty)
        pump_from_tmp (out->out, stdout);
      if (errfd_not_empty && out->err != out->out)
        pump_from_tmp (out->err, stderr);

      if (traced)
        log_working_directory (output_context, 0);

      /* Exit the critical section.  */
      if (sem)
        release_semaphore (sem);

      /* Truncate and reset the output, in case we use it again.  */
      if (out->out != OUTPUT_NONE)
        {
          int e;
          lseek (out->out, 0, SEEK_SET);
          EINTRLOOP (e, ftruncate (out->out, 0));
        }
      if (out->err != OUTPUT_NONE && out->err != out->out)
        {
          int e;
          lseek (out->err, 0, SEEK_SET);
          EINTRLOOP (e, ftruncate (out->err, 0));
        }
    }
}
#endif /* OUTPUT_SYNC */


/* Provide support for temporary files.  */

#ifndef HAVE_STDLIB_H
# ifdef HAVE_MKSTEMP
int mkstemp (char *template);
# else
char *mktemp (char *template);
# endif
#endif

FILE *
output_tmpfile (char **name, const char *template)
{
#ifdef HAVE_FDOPEN
  int fd;
#endif

#if defined HAVE_MKSTEMP || defined HAVE_MKTEMP
# define TEMPLATE_LEN   strlen (template)
#else
# define TEMPLATE_LEN   L_tmpnam
#endif
  *name = xmalloc (TEMPLATE_LEN + 1);
  strcpy (*name, template);

#if defined HAVE_MKSTEMP && defined HAVE_FDOPEN
  /* It's safest to use mkstemp(), if we can.  */
  fd = mkstemp (*name);
  if (fd == -1)
    return 0;
  return fdopen (fd, "w");
#else
# ifdef HAVE_MKTEMP
  (void) mktemp (*name);
# else
  (void) tmpnam (*name);
# endif

# ifdef HAVE_FDOPEN
  /* Can't use mkstemp(), but guard against a race condition.  */
  fd = open (*name, O_CREAT|O_EXCL|O_WRONLY, 0600);
  if (fd == -1)
    return 0;
  return fdopen (fd, "w");
# else
  /* Not secure, but what can we do?  */
  return fopen (*name, "w");
# endif
#endif
}


void
output_init (struct output *out)
{
  if (out)
    {
      out->out = out->err = OUTPUT_NONE;
      out->syncout = !!output_sync;
      return;
    }

  /* Configure this instance of make.  Be sure stdout is line-buffered.  */

#ifdef HAVE_SETVBUF
# ifdef SETVBUF_REVERSED
  setvbuf (stdout, _IOLBF, xmalloc (BUFSIZ), BUFSIZ);
# else  /* setvbuf not reversed.  */
  /* Some buggy systems lose if we pass 0 instead of allocating ourselves.  */
  setvbuf (stdout, 0, _IOLBF, BUFSIZ);
# endif /* setvbuf reversed.  */
#elif HAVE_SETLINEBUF
  setlinebuf (stdout);
#endif  /* setlinebuf missing.  */

  /* Force stdout/stderr into append mode.  This ensures parallel jobs won't
     lose output due to overlapping writes.  */
  set_append_mode (fileno (stdout));
  set_append_mode (fileno (stderr));
}

void
output_close (struct output *out)
{
  if (! out)
    {
      if (stdio_traced)
        log_working_directory (NULL, 0);
      return;
    }

#ifdef OUTPUT_SYNC
  output_dump (out);
#endif

  if (out->out >= 0)
    close (out->out);
  if (out->err >= 0 && out->err != out->out)
    close (out->err);

  output_init (out);
}

/* We're about to generate output: be sure it's set up.  */
void
output_start ()
{
#ifdef OUTPUT_SYNC
  if (output_context && output_context->syncout && ! OUTPUT_ISSET(output_context))
    setup_tmpfile (output_context);
#endif

  if (! output_context || output_sync == OUTPUT_SYNC_RECURSE)
    {
      if (! stdio_traced && print_directory_flag)
        stdio_traced = log_working_directory (NULL, 1);
    }
}

void
outputs (int is_err, const char *msg)
{
  if (! msg || *msg == '\0')
    return;

  output_start ();

  _outputs (output_context, is_err, msg);
}


/* Return formatted string buffers.
   If we move to gnulib we can use vasnprintf() etc. to make this simpler.
   Note these functions use a static buffer, so each call overwrites the
   results of the previous call.  */

static struct fmtstring
  {
    char *buffer;
    unsigned int size;
    unsigned int len;
  } fmtbuf = { NULL, 0, 0 };

/* Concatenate a formatted string onto the format buffer.  */
static const char *
vfmtconcat (const char *fmt, va_list args)
{
  va_list vcopy;
  int tot;
  int unused = fmtbuf.size - fmtbuf.len;

  va_copy (vcopy, args);

  tot = vsnprintf (&fmtbuf.buffer[fmtbuf.len], unused, fmt, args);
  assert (tot >= 0);

  if (tot >= unused)
    {
      fmtbuf.size += tot * 2;
      fmtbuf.buffer = xrealloc (fmtbuf.buffer, fmtbuf.size);

      unused = fmtbuf.size - fmtbuf.len;
      tot = vsnprintf (&fmtbuf.buffer[fmtbuf.len], unused, fmt, vcopy);
    }

  va_end (vcopy);

  fmtbuf.len += tot;

  return fmtbuf.buffer;
}

static const char *
fmtconcat (const char *fmt, ...)
{
  const char *p;
  va_list args;

  va_start (args, fmt);
  p = vfmtconcat (fmt, args);
  va_end (args);

  return p;
}

/* Print a message on stdout.  */

void
message (int prefix, const char *fmt, ...)
{
  va_list args;

  assert (fmt != NULL);

  fmtbuf.len = 0;

  if (prefix)
    {
      if (makelevel == 0)
        fmtconcat ("%s: ", program);
      else
        fmtconcat ("%s[%u]: ", program, makelevel);
    }

  va_start (args, fmt);
  vfmtconcat (fmt, args);
  va_end (args);

  fmtconcat ("\n");

  outputs (0, fmtbuf.buffer);
}

/* Print an error message.  */

void
error (const gmk_floc *flocp, const char *fmt, ...)
{
  va_list args;

  assert (fmt != NULL);

  fmtbuf.len = 0;

  if (flocp && flocp->filenm)
    fmtconcat ("%s:%lu: ", flocp->filenm, flocp->lineno);
  else if (makelevel == 0)
    fmtconcat ("%s: ", program);
  else
    fmtconcat ("%s[%u]: ", program, makelevel);

  va_start (args, fmt);
  vfmtconcat (fmt, args);
  va_end (args);

  fmtconcat ("\n");

  outputs (1, fmtbuf.buffer);
}

/* Print an error message and exit.  */

void
fatal (const gmk_floc *flocp, const char *fmt, ...)
{
  va_list args;

  assert (fmt != NULL);

  fmtbuf.len = 0;

  if (flocp && flocp->filenm)
    fmtconcat ("%s:%lu: *** ", flocp->filenm, flocp->lineno);
  else if (makelevel == 0)
    fmtconcat ("%s: *** ", program);
  else
    fmtconcat ("%s[%u]: *** ", program, makelevel);

  va_start (args, fmt);
  vfmtconcat (fmt, args);
  va_end (args);

  fmtconcat (_(".  Stop.\n"));
  outputs (1, fmtbuf.buffer);

  die (2);
}

/* Print an error message from errno.  */

void
perror_with_name (const char *str, const char *name)
{
  error (NILF, _("%s%s: %s"), str, name, strerror (errno));
}

/* Print an error message from errno and exit.  */

void
pfatal_with_name (const char *name)
{
  fatal (NILF, _("%s: %s"), name, strerror (errno));

  /* NOTREACHED */
}