summaryrefslogtreecommitdiff
path: root/misc.c
blob: 6df9556815a39cb864924061ff67527b92b13e82 (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
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
/* Miscellaneous generic support functions for GNU Make.
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006 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 2, 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
GNU Make; see the file COPYING.  If not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.  */

#include "make.h"
#include "dep.h"
#include "debug.h"

/* Variadic functions.  We go through contortions to allow proper function
   prototypes for both ANSI and pre-ANSI C compilers, and also for those
   which support stdarg.h vs. varargs.h, and finally those which have
   vfprintf(), etc. and those who have _doprnt... or nothing.

   This fancy stuff all came from GNU fileutils, except for the VA_PRINTF and
   VA_END macros used here since we have multiple print functions.  */

#if USE_VARIADIC
# if HAVE_STDARG_H
#  include <stdarg.h>
#  define VA_START(args, lastarg) va_start(args, lastarg)
# else
#  include <varargs.h>
#  define VA_START(args, lastarg) va_start(args)
# endif
# if HAVE_VPRINTF
#  define VA_PRINTF(fp, lastarg, args) vfprintf((fp), (lastarg), (args))
# else
#  define VA_PRINTF(fp, lastarg, args) _doprnt((lastarg), (args), (fp))
# endif
# define VA_END(args) va_end(args)
#else
/* We can't use any variadic interface! */
# define va_alist a1, a2, a3, a4, a5, a6, a7, a8
# define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
# define VA_START(args, lastarg)
# define VA_PRINTF(fp, lastarg, args) fprintf((fp), (lastarg), va_alist)
# define VA_END(args)
#endif


/* Compare strings *S1 and *S2.
   Return negative if the first is less, positive if it is greater,
   zero if they are equal.  */

int
alpha_compare (const void *v1, const void *v2)
{
  const char *s1 = *((char **)v1);
  const char *s2 = *((char **)v2);

  if (*s1 != *s2)
    return *s1 - *s2;
  return strcmp (s1, s2);
}

/* Discard each backslash-newline combination from LINE.
   Backslash-backslash-newline combinations become backslash-newlines.
   This is done by copying the text at LINE into itself.  */

void
collapse_continuations (char *line)
{
  register char *in, *out, *p;
  register int backslash;
  register unsigned int bs_write;

  in = strchr (line, '\n');
  if (in == 0)
    return;

  out = in;
  while (out > line && out[-1] == '\\')
    --out;

  while (*in != '\0')
    {
      /* BS_WRITE gets the number of quoted backslashes at
	 the end just before IN, and BACKSLASH gets nonzero
	 if the next character is quoted.  */
      backslash = 0;
      bs_write = 0;
      for (p = in - 1; p >= line && *p == '\\'; --p)
	{
	  if (backslash)
	    ++bs_write;
	  backslash = !backslash;

	  /* It should be impossible to go back this far without exiting,
	     but if we do, we can't get the right answer.  */
	  if (in == out - 1)
	    abort ();
	}

      /* Output the appropriate number of backslashes.  */
      while (bs_write-- > 0)
	*out++ = '\\';

      /* Skip the newline.  */
      ++in;

      /* If the newline is quoted, discard following whitespace
	 and any preceding whitespace; leave just one space.  */
      if (backslash)
	{
	  in = next_token (in);
	  while (out > line && isblank ((unsigned char)out[-1]))
	    --out;
	  *out++ = ' ';
	}
      else
	/* If the newline isn't quoted, put it in the output.  */
	*out++ = '\n';

      /* Now copy the following line to the output.
	 Stop when we find backslashes followed by a newline.  */
      while (*in != '\0')
	if (*in == '\\')
	  {
	    p = in + 1;
	    while (*p == '\\')
	      ++p;
	    if (*p == '\n')
	      {
		in = p;
		break;
	      }
	    while (in < p)
	      *out++ = *in++;
	  }
	else
	  *out++ = *in++;
    }

  *out = '\0';
}

/* Print N spaces (used in debug for target-depth).  */

void
print_spaces (unsigned int n)
{
  while (n-- > 0)
    putchar (' ');
}


/* Return a newly-allocated string whose contents
   concatenate those of s1, s2, s3.  */

char *
concat (const char *s1, const char *s2, const char *s3)
{
  unsigned int len1, len2, len3;
  char *result;

  len1 = *s1 != '\0' ? strlen (s1) : 0;
  len2 = *s2 != '\0' ? strlen (s2) : 0;
  len3 = *s3 != '\0' ? strlen (s3) : 0;

  result = (char *) xmalloc (len1 + len2 + len3 + 1);

  if (*s1 != '\0')
    bcopy (s1, result, len1);
  if (*s2 != '\0')
    bcopy (s2, result + len1, len2);
  if (*s3 != '\0')
    bcopy (s3, result + len1 + len2, len3);
  *(result + len1 + len2 + len3) = '\0';

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

void
#if HAVE_ANSI_COMPILER && USE_VARIADIC && HAVE_STDARG_H
message (int prefix, const char *fmt, ...)
#else
message (prefix, fmt, va_alist)
     int prefix;
     const char *fmt;
     va_dcl
#endif
{
#if USE_VARIADIC
  va_list args;
#endif

  log_working_directory (1);

  if (fmt != 0)
    {
      if (prefix)
	{
	  if (makelevel == 0)
	    printf ("%s: ", program);
	  else
	    printf ("%s[%u]: ", program, makelevel);
	}
      VA_START (args, fmt);
      VA_PRINTF (stdout, fmt, args);
      VA_END (args);
      putchar ('\n');
    }

  fflush (stdout);
}

/* Print an error message.  */

void
#if HAVE_ANSI_COMPILER && USE_VARIADIC && HAVE_STDARG_H
error (const struct floc *flocp, const char *fmt, ...)
#else
error (flocp, fmt, va_alist)
     const struct floc *flocp;
     const char *fmt;
     va_dcl
#endif
{
#if USE_VARIADIC
  va_list args;
#endif

  log_working_directory (1);

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

  VA_START(args, fmt);
  VA_PRINTF (stderr, fmt, args);
  VA_END (args);

  putc ('\n', stderr);
  fflush (stderr);
}

/* Print an error message and exit.  */

void
#if HAVE_ANSI_COMPILER && USE_VARIADIC && HAVE_STDARG_H
fatal (const struct floc *flocp, const char *fmt, ...)
#else
fatal (flocp, fmt, va_alist)
     const struct floc *flocp;
     const char *fmt;
     va_dcl
#endif
{
#if USE_VARIADIC
  va_list args;
#endif

  log_working_directory (1);

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

  VA_START(args, fmt);
  VA_PRINTF (stderr, fmt, args);
  VA_END (args);

  fputs (_(".  Stop.\n"), stderr);

  die (2);
}

#ifndef HAVE_STRERROR

#undef	strerror

char *
strerror (int errnum)
{
  extern int errno, sys_nerr;
#ifndef __DECC
  extern char *sys_errlist[];
#endif
  static char buf[] = "Unknown error 12345678901234567890";

  if (errno < sys_nerr)
    return sys_errlist[errnum];

  sprintf (buf, _("Unknown error %d"), errnum);
  return buf;
}
#endif

/* 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 */
}

/* Like malloc but get fatal error if memory is exhausted.  */
/* Don't bother if we're using dmalloc; it provides these for us.  */

#ifndef HAVE_DMALLOC_H

#undef xmalloc
#undef xrealloc
#undef xstrdup

char *
xmalloc (unsigned int size)
{
  /* Make sure we don't allocate 0, for pre-ANSI libraries.  */
  char *result = (char *) malloc (size ? size : 1);
  if (result == 0)
    fatal (NILF, _("virtual memory exhausted"));
  return result;
}


char *
xrealloc (char *ptr, unsigned int size)
{
  char *result;

  /* Some older implementations of realloc() don't conform to ANSI.  */
  if (! size)
    size = 1;
  result = ptr ? realloc (ptr, size) : malloc (size);
  if (result == 0)
    fatal (NILF, _("virtual memory exhausted"));
  return result;
}


char *
xstrdup (const char *ptr)
{
  char *result;

#ifdef HAVE_STRDUP
  result = strdup (ptr);
#else
  result = (char *) malloc (strlen (ptr) + 1);
#endif

  if (result == 0)
    fatal (NILF, _("virtual memory exhausted"));

#ifdef HAVE_STRDUP
  return result;
#else
  return strcpy(result, ptr);
#endif
}

#endif  /* HAVE_DMALLOC_H */

char *
savestring (const char *str, unsigned int length)
{
  register char *out = (char *) xmalloc (length + 1);
  if (length > 0)
    bcopy (str, out, length);
  out[length] = '\0';
  return out;
}


/* Limited INDEX:
   Search through the string STRING, which ends at LIMIT, for the character C.
   Returns a pointer to the first occurrence, or nil if none is found.
   Like INDEX except that the string searched ends where specified
   instead of at the first null.  */

char *
lindex (const char *s, const char *limit, int c)
{
  while (s < limit)
    if (*s++ == c)
      return (char *)(s - 1);

  return 0;
}

/* Return the address of the first whitespace or null in the string S.  */

char *
end_of_token (const char *s)
{
  while (*s != '\0' && !isblank ((unsigned char)*s))
    ++s;
  return (char *)s;
}

#ifdef WINDOWS32
/*
 * Same as end_of_token, but take into account a stop character
 */
char *
end_of_token_w32 (char *s, char stopchar)
{
  register char *p = s;
  register int backslash = 0;

  while (*p != '\0' && *p != stopchar
	 && (backslash || !isblank ((unsigned char)*p)))
    {
      if (*p++ == '\\')
        {
          backslash = !backslash;
          while (*p == '\\')
            {
              backslash = !backslash;
              ++p;
            }
        }
      else
        backslash = 0;
    }

  return p;
}
#endif

/* Return the address of the first nonwhitespace or null in the string S.  */

char *
next_token (const char *s)
{
  while (isblank ((unsigned char)*s))
    ++s;
  return (char *)s;
}

/* Find the next token in PTR; return the address of it, and store the
   length of the token into *LENGTHPTR if LENGTHPTR is not nil.  */

char *
find_next_token (char **ptr, unsigned int *lengthptr)
{
  char *p = next_token (*ptr);
  char *end;

  if (*p == '\0')
    return 0;

  *ptr = end = end_of_token (p);
  if (lengthptr != 0)
    *lengthptr = end - p;
  return p;
}

/* Copy a chain of `struct dep', making a new chain
   with the same contents as the old one.  */

struct dep *
copy_dep_chain (const struct dep *d)
{
  register struct dep *c;
  struct dep *firstnew = 0;
  struct dep *lastnew = 0;

  while (d != 0)
    {
      c = (struct dep *) xmalloc (sizeof (struct dep));
      bcopy ((char *) d, (char *) c, sizeof (struct dep));
      if (c->name != 0)
	c->name = xstrdup (c->name);
      c->next = 0;
      if (firstnew == 0)
	firstnew = lastnew = c;
      else
	lastnew = lastnew->next = c;

      d = d->next;
    }

  return firstnew;
}

/* Free a chain of 'struct dep'.  */

void
free_dep_chain (struct dep *d)
{
  while (d != 0)
    {
      struct dep *df = d;
      d = d->next;

      free (df->name);
      free ((char *)df);
    }
}

/* Free a chain of `struct nameseq'. Each nameseq->name is freed
   as well.  Can be used on `struct dep' chains.*/

void
free_ns_chain (struct nameseq *n)
{
  register struct nameseq *tmp;

  while (n != 0)
  {
    if (n->name != 0)
      free (n->name);

    tmp = n;

    n = n->next;

    free (tmp);
  }

}
#ifdef	iAPX286
/* The losing compiler on this machine can't handle this macro.  */

char *
dep_name (struct dep *dep)
{
  return dep->name == 0 ? dep->file->name : dep->name;
}
#endif

#ifdef	GETLOADAVG_PRIVILEGED

#ifdef POSIX

/* Hopefully if a system says it's POSIX.1 and has the setuid and setgid
   functions, they work as POSIX.1 says.  Some systems (Alpha OSF/1 1.2,
   for example) which claim to be POSIX.1 also have the BSD setreuid and
   setregid functions, but they don't work as in BSD and only the POSIX.1
   way works.  */

#undef HAVE_SETREUID
#undef HAVE_SETREGID

#else	/* Not POSIX.  */

/* Some POSIX.1 systems have the seteuid and setegid functions.  In a
   POSIX-like system, they are the best thing to use.  However, some
   non-POSIX systems have them too but they do not work in the POSIX style
   and we must use setreuid and setregid instead.  */

#undef HAVE_SETEUID
#undef HAVE_SETEGID

#endif	/* POSIX.  */

#ifndef	HAVE_UNISTD_H
extern int getuid (), getgid (), geteuid (), getegid ();
extern int setuid (), setgid ();
#ifdef HAVE_SETEUID
extern int seteuid ();
#else
#ifdef	HAVE_SETREUID
extern int setreuid ();
#endif	/* Have setreuid.  */
#endif	/* Have seteuid.  */
#ifdef HAVE_SETEGID
extern int setegid ();
#else
#ifdef	HAVE_SETREGID
extern int setregid ();
#endif	/* Have setregid.  */
#endif	/* Have setegid.  */
#endif	/* No <unistd.h>.  */

/* Keep track of the user and group IDs for user- and make- access.  */
static int user_uid = -1, user_gid = -1, make_uid = -1, make_gid = -1;
#define	access_inited	(user_uid != -1)
static enum { make, user } current_access;


/* Under -d, write a message describing the current IDs.  */

static void
log_access (char *flavor)
{
  if (! ISDB (DB_JOBS))
    return;

  /* All the other debugging messages go to stdout,
     but we write this one to stderr because it might be
     run in a child fork whose stdout is piped.  */

  fprintf (stderr, _("%s: user %lu (real %lu), group %lu (real %lu)\n"),
	   flavor, (unsigned long) geteuid (), (unsigned long) getuid (),
           (unsigned long) getegid (), (unsigned long) getgid ());
  fflush (stderr);
}


static void
init_access (void)
{
#ifndef VMS
  user_uid = getuid ();
  user_gid = getgid ();

  make_uid = geteuid ();
  make_gid = getegid ();

  /* Do these ever fail?  */
  if (user_uid == -1 || user_gid == -1 || make_uid == -1 || make_gid == -1)
    pfatal_with_name ("get{e}[gu]id");

  log_access (_("Initialized access"));

  current_access = make;
#endif
}

#endif	/* GETLOADAVG_PRIVILEGED */

/* Give the process appropriate permissions for access to
   user data (i.e., to stat files, or to spawn a child process).  */
void
user_access (void)
{
#ifdef	GETLOADAVG_PRIVILEGED

  if (!access_inited)
    init_access ();

  if (current_access == user)
    return;

  /* We are in "make access" mode.  This means that the effective user and
     group IDs are those of make (if it was installed setuid or setgid).
     We now want to set the effective user and group IDs to the real IDs,
     which are the IDs of the process that exec'd make.  */

#ifdef	HAVE_SETEUID

  /* Modern systems have the seteuid/setegid calls which set only the
     effective IDs, which is ideal.  */

  if (seteuid (user_uid) < 0)
    pfatal_with_name ("user_access: seteuid");

#else	/* Not HAVE_SETEUID.  */

#ifndef	HAVE_SETREUID

  /* System V has only the setuid/setgid calls to set user/group IDs.
     There is an effective ID, which can be set by setuid/setgid.
     It can be set (unless you are root) only to either what it already is
     (returned by geteuid/getegid, now in make_uid/make_gid),
     the real ID (return by getuid/getgid, now in user_uid/user_gid),
     or the saved set ID (what the effective ID was before this set-ID
     executable (make) was exec'd).  */

  if (setuid (user_uid) < 0)
    pfatal_with_name ("user_access: setuid");

#else	/* HAVE_SETREUID.  */

  /* In 4BSD, the setreuid/setregid calls set both the real and effective IDs.
     They may be set to themselves or each other.  So you have two alternatives
     at any one time.  If you use setuid/setgid, the effective will be set to
     the real, leaving only one alternative.  Using setreuid/setregid, however,
     you can toggle between your two alternatives by swapping the values in a
     single setreuid or setregid call.  */

  if (setreuid (make_uid, user_uid) < 0)
    pfatal_with_name ("user_access: setreuid");

#endif	/* Not HAVE_SETREUID.  */
#endif	/* HAVE_SETEUID.  */

#ifdef	HAVE_SETEGID
  if (setegid (user_gid) < 0)
    pfatal_with_name ("user_access: setegid");
#else
#ifndef	HAVE_SETREGID
  if (setgid (user_gid) < 0)
    pfatal_with_name ("user_access: setgid");
#else
  if (setregid (make_gid, user_gid) < 0)
    pfatal_with_name ("user_access: setregid");
#endif
#endif

  current_access = user;

  log_access (_("User access"));

#endif	/* GETLOADAVG_PRIVILEGED */
}

/* Give the process appropriate permissions for access to
   make data (i.e., the load average).  */
void
make_access (void)
{
#ifdef	GETLOADAVG_PRIVILEGED

  if (!access_inited)
    init_access ();

  if (current_access == make)
    return;

  /* See comments in user_access, above.  */

#ifdef	HAVE_SETEUID
  if (seteuid (make_uid) < 0)
    pfatal_with_name ("make_access: seteuid");
#else
#ifndef	HAVE_SETREUID
  if (setuid (make_uid) < 0)
    pfatal_with_name ("make_access: setuid");
#else
  if (setreuid (user_uid, make_uid) < 0)
    pfatal_with_name ("make_access: setreuid");
#endif
#endif

#ifdef	HAVE_SETEGID
  if (setegid (make_gid) < 0)
    pfatal_with_name ("make_access: setegid");
#else
#ifndef	HAVE_SETREGID
  if (setgid (make_gid) < 0)
    pfatal_with_name ("make_access: setgid");
#else
  if (setregid (user_gid, make_gid) < 0)
    pfatal_with_name ("make_access: setregid");
#endif
#endif

  current_access = make;

  log_access (_("Make access"));

#endif	/* GETLOADAVG_PRIVILEGED */
}

/* Give the process appropriate permissions for a child process.
   This is like user_access, but you can't get back to make_access.  */
void
child_access (void)
{
#ifdef	GETLOADAVG_PRIVILEGED

  if (!access_inited)
    abort ();

  /* Set both the real and effective UID and GID to the user's.
     They cannot be changed back to make's.  */

#ifndef	HAVE_SETREUID
  if (setuid (user_uid) < 0)
    pfatal_with_name ("child_access: setuid");
#else
  if (setreuid (user_uid, user_uid) < 0)
    pfatal_with_name ("child_access: setreuid");
#endif

#ifndef	HAVE_SETREGID
  if (setgid (user_gid) < 0)
    pfatal_with_name ("child_access: setgid");
#else
  if (setregid (user_gid, user_gid) < 0)
    pfatal_with_name ("child_access: setregid");
#endif

  log_access (_("Child access"));

#endif	/* GETLOADAVG_PRIVILEGED */
}

#ifdef NEED_GET_PATH_MAX
unsigned int
get_path_max (void)
{
  static unsigned int value;

  if (value == 0)
    {
      long int x = pathconf ("/", _PC_PATH_MAX);
      if (x > 0)
	value = x;
      else
	return MAXPATHLEN;
    }

  return value;
}
#endif


/* This code is stolen from gnulib.
   If/when we abandon the requirement to work with K&R compilers, we can
   remove this (and perhaps other parts of GNU make!) and migrate to using
   gnulib directly.

   This is called only through atexit(), which means die() has already been
   invoked.  So, call exit() here directly.  Apparently that works...?
*/

/* Close standard output, exiting with status 'exit_failure' on failure.
   If a program writes *anything* to stdout, that program should close
   stdout and make sure that it succeeds before exiting.  Otherwise,
   suppose that you go to the extreme of checking the return status
   of every function that does an explicit write to stdout.  The last
   printf can succeed in writing to the internal stream buffer, and yet
   the fclose(stdout) could still fail (due e.g., to a disk full error)
   when it tries to write out that buffered data.  Thus, you would be
   left with an incomplete output file and the offending program would
   exit successfully.  Even calling fflush is not always sufficient,
   since some file systems (NFS and CODA) buffer written/flushed data
   until an actual close call.

   Besides, it's wasteful to check the return value from every call
   that writes to stdout -- just let the internal stream state record
   the failure.  That's what the ferror test is checking below.

   It's important to detect such failures and exit nonzero because many
   tools (most notably `make' and other build-management systems) depend
   on being able to detect failure in other tools via their exit status.  */

void
close_stdout (void)
{
  int prev_fail = ferror (stdout);
  int fclose_fail = fclose (stdout);

  if (prev_fail || fclose_fail)
    {
      if (fclose_fail)
        error (NILF, _("write error: %s"), strerror (errno));
      else
        error (NILF, _("write error"));
      exit (EXIT_FAILURE);
    }
}