misc.c

   1 /* Miscellaneous generic support functions for GNU Make.
   2 Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1997,
   3 2002 Free Software Foundation, Inc.
   4 This file is part of GNU Make.
   5
   6 GNU Make is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Make is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Make; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #include "make.h"
  22 #include "dep.h"
  23 #include "debug.h"
  24
  25 /* Variadic functions.  We go through contortions to allow proper function
  26    prototypes for both ANSI and pre-ANSI C compilers, and also for those
  27    which support stdarg.h vs. varargs.h, and finally those which have
  28    vfprintf(), etc. and those who have _doprnt... or nothing.
  29
  30    This fancy stuff all came from GNU fileutils, except for the VA_PRINTF and
  31    VA_END macros used here since we have multiple print functions.  */
  32
  33 #if USE_VARIADIC
  34 # if HAVE_STDARG_H
  35 #  include <stdarg.h>
  36 #  define VA_START(args, lastarg) va_start(args, lastarg)
  37 # else
  38 #  include <varargs.h>
  39 #  define VA_START(args, lastarg) va_start(args)
  40 # endif
  41 # if HAVE_VPRINTF
  42 #  define VA_PRINTF(fp, lastarg, args) vfprintf((fp), (lastarg), (args))
  43 # else
  44 #  define VA_PRINTF(fp, lastarg, args) _doprnt((lastarg), (args), (fp))
  45 # endif
  46 # define VA_END(args) va_end(args)
  47 #else
  48 /* We can't use any variadic interface! */
  49 # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
  50 # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
  51 # define VA_START(args, lastarg)
  52 # define VA_PRINTF(fp, lastarg, args) fprintf((fp), (lastarg), va_alist)
  53 # define VA_END(args)
  54 #endif
  55
  56
  57 /* Compare strings *S1 and *S2.
  58    Return negative if the first is less, positive if it is greater,
  59    zero if they are equal.  */
  60
  61 int
  62 alpha_compare (const void *v1, const void *v2)
  63 {
  64   const char *s1 = *((char **)v1);
  65   const char *s2 = *((char **)v2);
  66
  67   if (*s1 != *s2)
  68     return *s1 - *s2;
  69   return strcmp (s1, s2);
  70 }
  71 \f
  72 /* Discard each backslash-newline combination from LINE.
  73    Backslash-backslash-newline combinations become backslash-newlines.
  74    This is done by copying the text at LINE into itself.  */
  75
  76 void
  77 collapse_continuations (char *line)
  78 {
  79   register char *in, *out, *p;
  80   register int backslash;
  81   register unsigned int bs_write;
  82
  83   in = strchr (line, '\n');
  84   if (in == 0)
  85     return;
  86
  87   out = in;
  88   while (out > line && out[-1] == '\\')
  89     --out;
  90
  91   while (*in != '\0')
  92     {
  93       /* BS_WRITE gets the number of quoted backslashes at
  94          the end just before IN, and BACKSLASH gets nonzero
  95          if the next character is quoted.  */
  96       backslash = 0;
  97       bs_write = 0;
  98       for (p = in - 1; p >= line && *p == '\\'; --p)
  99         {
 100           if (backslash)
 101             ++bs_write;
 102           backslash = !backslash;
 103
 104           /* It should be impossible to go back this far without exiting,
 105              but if we do, we can't get the right answer.  */
 106           if (in == out - 1)
 107             abort ();
 108         }
 109
 110       /* Output the appropriate number of backslashes.  */
 111       while (bs_write-- > 0)
 112         *out++ = '\\';
 113
 114       /* Skip the newline.  */
 115       ++in;
 116
 117       /* If the newline is quoted, discard following whitespace
 118          and any preceding whitespace; leave just one space.  */
 119       if (backslash)
 120         {
 121           in = next_token (in);
 122           while (out > line && isblank ((unsigned char)out[-1]))
 123             --out;
 124           *out++ = ' ';
 125         }
 126       else
 127         /* If the newline isn't quoted, put it in the output.  */
 128         *out++ = '\n';
 129
 130       /* Now copy the following line to the output.
 131          Stop when we find backslashes followed by a newline.  */
 132       while (*in != '\0')
 133         if (*in == '\\')
 134           {
 135             p = in + 1;
 136             while (*p == '\\')
 137               ++p;
 138             if (*p == '\n')
 139               {
 140                 in = p;
 141                 break;
 142               }
 143             while (in < p)
 144               *out++ = *in++;
 145           }
 146         else
 147           *out++ = *in++;
 148     }
 149
 150   *out = '\0';
 151 }
 152
 153
 154 /* Remove comments from LINE.
 155    This is done by copying the text at LINE onto itself.  */
 156
 157 void
 158 remove_comments (char *line)
 159 {
 160   char *comment;
 161
 162   comment = find_char_unquote (line, '#', 0, 0);
 163
 164   if (comment != 0)
 165     /* Cut off the line at the #.  */
 166     *comment = '\0';
 167 }
 168 \f
 169 /* Print N spaces (used in debug for target-depth).  */
 170
 171 void
 172 print_spaces (unsigned int n)
 173 {
 174   while (n-- > 0)
 175     putchar (' ');
 176 }
 177
 178 \f
 179 /* Return a newly-allocated string whose contents
 180    concatenate those of s1, s2, s3.  */
 181
 182 char *
 183 concat (const char *s1, const char *s2, const char *s3)
 184 {
 185   unsigned int len1, len2, len3;
 186   char *result;
 187
 188   len1 = *s1 != '\0' ? strlen (s1) : 0;
 189   len2 = *s2 != '\0' ? strlen (s2) : 0;
 190   len3 = *s3 != '\0' ? strlen (s3) : 0;
 191
 192   result = (char *) xmalloc (len1 + len2 + len3 + 1);
 193
 194   if (*s1 != '\0')
 195     bcopy (s1, result, len1);
 196   if (*s2 != '\0')
 197     bcopy (s2, result + len1, len2);
 198   if (*s3 != '\0')
 199     bcopy (s3, result + len1 + len2, len3);
 200   *(result + len1 + len2 + len3) = '\0';
 201
 202   return result;
 203 }
 204 \f
 205 /* Print a message on stdout.  */
 206
 207 void
 208 #if HAVE_ANSI_COMPILER && USE_VARIADIC && HAVE_STDARG_H
 209 message (int prefix, const char *fmt, ...)
 210 #else
 211 message (prefix, fmt, va_alist)
 212      int prefix;
 213      const char *fmt;
 214      va_dcl
 215 #endif
 216 {
 217 #if USE_VARIADIC
 218   va_list args;
 219 #endif
 220
 221   log_working_directory (1);
 222
 223   if (fmt != 0)
 224     {
 225       if (prefix)
 226         {
 227           if (makelevel == 0)
 228             printf ("%s: ", program);
 229           else
 230             printf ("%s[%u]: ", program, makelevel);
 231         }
 232       VA_START (args, fmt);
 233       VA_PRINTF (stdout, fmt, args);
 234       VA_END (args);
 235       putchar ('\n');
 236     }
 237
 238   fflush (stdout);
 239 }
 240
 241 /* Print an error message.  */
 242
 243 void
 244 #if HAVE_ANSI_COMPILER && USE_VARIADIC && HAVE_STDARG_H
 245 error (const struct floc *flocp, const char *fmt, ...)
 246 #else
 247 error (flocp, fmt, va_alist)
 248      const struct floc *flocp;
 249      const char *fmt;
 250      va_dcl
 251 #endif
 252 {
 253 #if USE_VARIADIC
 254   va_list args;
 255 #endif
 256
 257   log_working_directory (1);
 258
 259   if (flocp && flocp->filenm)
 260     fprintf (stderr, "%s:%lu: ", flocp->filenm, flocp->lineno);
 261   else if (makelevel == 0)
 262     fprintf (stderr, "%s: ", program);
 263   else
 264     fprintf (stderr, "%s[%u]: ", program, makelevel);
 265
 266   VA_START(args, fmt);
 267   VA_PRINTF (stderr, fmt, args);
 268   VA_END (args);
 269
 270   putc ('\n', stderr);
 271   fflush (stderr);
 272 }
 273
 274 /* Print an error message and exit.  */
 275
 276 void
 277 #if HAVE_ANSI_COMPILER && USE_VARIADIC && HAVE_STDARG_H
 278 fatal (const struct floc *flocp, const char *fmt, ...)
 279 #else
 280 fatal (flocp, fmt, va_alist)
 281      const struct floc *flocp;
 282      const char *fmt;
 283      va_dcl
 284 #endif
 285 {
 286 #if USE_VARIADIC
 287   va_list args;
 288 #endif
 289
 290   log_working_directory (1);
 291
 292   if (flocp && flocp->filenm)
 293     fprintf (stderr, "%s:%lu: *** ", flocp->filenm, flocp->lineno);
 294   else if (makelevel == 0)
 295     fprintf (stderr, "%s: *** ", program);
 296   else
 297     fprintf (stderr, "%s[%u]: *** ", program, makelevel);
 298
 299   VA_START(args, fmt);
 300   VA_PRINTF (stderr, fmt, args);
 301   VA_END (args);
 302
 303   fputs (_(".  Stop.\n"), stderr);
 304
 305   die (2);
 306 }
 307
 308 #ifndef HAVE_STRERROR
 309
 310 #undef  strerror
 311
 312 char *
 313 strerror (int errnum)
 314 {
 315   extern int errno, sys_nerr;
 316 #ifndef __DECC
 317   extern char *sys_errlist[];
 318 #endif
 319   static char buf[] = "Unknown error 12345678901234567890";
 320
 321   if (errno < sys_nerr)
 322     return sys_errlist[errnum];
 323
 324   sprintf (buf, _("Unknown error %d"), errnum);
 325   return buf;
 326 }
 327 #endif
 328
 329 /* Print an error message from errno.  */
 330
 331 void
 332 perror_with_name (const char *str, const char *name)
 333 {
 334   error (NILF, _("%s%s: %s"), str, name, strerror (errno));
 335 }
 336
 337 /* Print an error message from errno and exit.  */
 338
 339 void
 340 pfatal_with_name (const char *name)
 341 {
 342   fatal (NILF, _("%s: %s"), name, strerror (errno));
 343
 344   /* NOTREACHED */
 345 }
 346 \f
 347 /* Like malloc but get fatal error if memory is exhausted.  */
 348 /* Don't bother if we're using dmalloc; it provides these for us.  */
 349
 350 #ifndef HAVE_DMALLOC_H
 351
 352 #undef xmalloc
 353 #undef xrealloc
 354 #undef xstrdup
 355
 356 char *
 357 xmalloc (unsigned int size)
 358 {
 359   /* Make sure we don't allocate 0, for pre-ANSI libraries.  */
 360   char *result = (char *) malloc (size ? size : 1);
 361   if (result == 0)
 362     fatal (NILF, _("virtual memory exhausted"));
 363   return result;
 364 }
 365
 366
 367 char *
 368 xrealloc (char *ptr, unsigned int size)
 369 {
 370   char *result;
 371
 372   /* Some older implementations of realloc() don't conform to ANSI.  */
 373   if (! size)
 374     size = 1;
 375   result = ptr ? realloc (ptr, size) : malloc (size);
 376   if (result == 0)
 377     fatal (NILF, _("virtual memory exhausted"));
 378   return result;
 379 }
 380
 381
 382 char *
 383 xstrdup (const char *ptr)
 384 {
 385   char *result;
 386
 387 #ifdef HAVE_STRDUP
 388   result = strdup (ptr);
 389 #else
 390   result = (char *) malloc (strlen (ptr) + 1);
 391 #endif
 392
 393   if (result == 0)
 394     fatal (NILF, _("virtual memory exhausted"));
 395
 396 #ifdef HAVE_STRDUP
 397   return result;
 398 #else
 399   return strcpy(result, ptr);
 400 #endif
 401 }
 402
 403 #endif  /* HAVE_DMALLOC_H */
 404
 405 char *
 406 savestring (const char *str, unsigned int length)
 407 {
 408   register char *out = (char *) xmalloc (length + 1);
 409   if (length > 0)
 410     bcopy (str, out, length);
 411   out[length] = '\0';
 412   return out;
 413 }
 414 \f
 415
 416 /* Limited INDEX:
 417    Search through the string STRING, which ends at LIMIT, for the character C.
 418    Returns a pointer to the first occurrence, or nil if none is found.
 419    Like INDEX except that the string searched ends where specified
 420    instead of at the first null.  */
 421
 422 char *
 423 lindex (const char *s, const char *limit, int c)
 424 {
 425   while (s < limit)
 426     if (*s++ == c)
 427       return (char *)(s - 1);
 428
 429   return 0;
 430 }
 431 \f
 432 /* Return the address of the first whitespace or null in the string S.  */
 433
 434 char *
 435 end_of_token (char *s)
 436 {
 437   while (*s != '\0' && !isblank ((unsigned char)*s))
 438     ++s;
 439   return s;
 440 }
 441
 442 #ifdef WINDOWS32
 443 /*
 444  * Same as end_of_token, but take into account a stop character
 445  */
 446 char *
 447 end_of_token_w32 (char *s, char stopchar)
 448 {
 449   register char *p = s;
 450   register int backslash = 0;
 451
 452   while (*p != '\0' && *p != stopchar
 453          && (backslash || !isblank ((unsigned char)*p)))
 454     {
 455       if (*p++ == '\\')
 456         {
 457           backslash = !backslash;
 458           while (*p == '\\')
 459             {
 460               backslash = !backslash;
 461               ++p;
 462             }
 463         }
 464       else
 465         backslash = 0;
 466     }
 467
 468   return p;
 469 }
 470 #endif
 471
 472 /* Return the address of the first nonwhitespace or null in the string S.  */
 473
 474 char *
 475 next_token (const char *s)
 476 {
 477   while (isblank ((unsigned char)*s))
 478     ++s;
 479   return (char *)s;
 480 }
 481
 482 /* Find the next token in PTR; return the address of it, and store the
 483    length of the token into *LENGTHPTR if LENGTHPTR is not nil.  */
 484
 485 char *
 486 find_next_token (char **ptr, unsigned int *lengthptr)
 487 {
 488   char *p = next_token (*ptr);
 489   char *end;
 490
 491   if (*p == '\0')
 492     return 0;
 493
 494   *ptr = end = end_of_token (p);
 495   if (lengthptr != 0)
 496     *lengthptr = end - p;
 497   return p;
 498 }
 499 \f
 500 /* Copy a chain of `struct dep', making a new chain
 501    with the same contents as the old one.  */
 502
 503 struct dep *
 504 copy_dep_chain (struct dep *d)
 505 {
 506   register struct dep *c;
 507   struct dep *firstnew = 0;
 508   struct dep *lastnew = 0;
 509
 510   while (d != 0)
 511     {
 512       c = (struct dep *) xmalloc (sizeof (struct dep));
 513       bcopy ((char *) d, (char *) c, sizeof (struct dep));
 514       if (c->name != 0)
 515         c->name = xstrdup (c->name);
 516       c->next = 0;
 517       if (firstnew == 0)
 518         firstnew = lastnew = c;
 519       else
 520         lastnew = lastnew->next = c;
 521
 522       d = d->next;
 523     }
 524
 525   return firstnew;
 526 }
 527 \f
 528 #ifdef  iAPX286
 529 /* The losing compiler on this machine can't handle this macro.  */
 530
 531 char *
 532 dep_name (struct dep *dep)
 533 {
 534   return dep->name == 0 ? dep->file->name : dep->name;
 535 }
 536 #endif
 537 \f
 538 #ifdef  GETLOADAVG_PRIVILEGED
 539
 540 #ifdef POSIX
 541
 542 /* Hopefully if a system says it's POSIX.1 and has the setuid and setgid
 543    functions, they work as POSIX.1 says.  Some systems (Alpha OSF/1 1.2,
 544    for example) which claim to be POSIX.1 also have the BSD setreuid and
 545    setregid functions, but they don't work as in BSD and only the POSIX.1
 546    way works.  */
 547
 548 #undef HAVE_SETREUID
 549 #undef HAVE_SETREGID
 550
 551 #else   /* Not POSIX.  */
 552
 553 /* Some POSIX.1 systems have the seteuid and setegid functions.  In a
 554    POSIX-like system, they are the best thing to use.  However, some
 555    non-POSIX systems have them too but they do not work in the POSIX style
 556    and we must use setreuid and setregid instead.  */
 557
 558 #undef HAVE_SETEUID
 559 #undef HAVE_SETEGID
 560
 561 #endif  /* POSIX.  */
 562
 563 #ifndef HAVE_UNISTD_H
 564 extern int getuid (), getgid (), geteuid (), getegid ();
 565 extern int setuid (), setgid ();
 566 #ifdef HAVE_SETEUID
 567 extern int seteuid ();
 568 #else
 569 #ifdef  HAVE_SETREUID
 570 extern int setreuid ();
 571 #endif  /* Have setreuid.  */
 572 #endif  /* Have seteuid.  */
 573 #ifdef HAVE_SETEGID
 574 extern int setegid ();
 575 #else
 576 #ifdef  HAVE_SETREGID
 577 extern int setregid ();
 578 #endif  /* Have setregid.  */
 579 #endif  /* Have setegid.  */
 580 #endif  /* No <unistd.h>.  */
 581
 582 /* Keep track of the user and group IDs for user- and make- access.  */
 583 static int user_uid = -1, user_gid = -1, make_uid = -1, make_gid = -1;
 584 #define access_inited   (user_uid != -1)
 585 static enum { make, user } current_access;
 586
 587
 588 /* Under -d, write a message describing the current IDs.  */
 589
 590 static void
 591 log_access (char *flavor)
 592 {
 593   if (! ISDB (DB_JOBS))
 594     return;
 595
 596   /* All the other debugging messages go to stdout,
 597      but we write this one to stderr because it might be
 598      run in a child fork whose stdout is piped.  */
 599
 600   fprintf (stderr, _("%s: user %lu (real %lu), group %lu (real %lu)\n"),
 601            flavor, (unsigned long) geteuid (), (unsigned long) getuid (),
 602            (unsigned long) getegid (), (unsigned long) getgid ());
 603   fflush (stderr);
 604 }
 605
 606
 607 static void
 608 init_access (void)
 609 {
 610 #ifndef VMS
 611   user_uid = getuid ();
 612   user_gid = getgid ();
 613
 614   make_uid = geteuid ();
 615   make_gid = getegid ();
 616
 617   /* Do these ever fail?  */
 618   if (user_uid == -1 || user_gid == -1 || make_uid == -1 || make_gid == -1)
 619     pfatal_with_name ("get{e}[gu]id");
 620
 621   log_access (_("Initialized access"));
 622
 623   current_access = make;
 624 #endif
 625 }
 626
 627 #endif  /* GETLOADAVG_PRIVILEGED */
 628
 629 /* Give the process appropriate permissions for access to
 630    user data (i.e., to stat files, or to spawn a child process).  */
 631 void
 632 user_access (void)
 633 {
 634 #ifdef  GETLOADAVG_PRIVILEGED
 635
 636   if (!access_inited)
 637     init_access ();
 638
 639   if (current_access == user)
 640     return;
 641
 642   /* We are in "make access" mode.  This means that the effective user and
 643      group IDs are those of make (if it was installed setuid or setgid).
 644      We now want to set the effective user and group IDs to the real IDs,
 645      which are the IDs of the process that exec'd make.  */
 646
 647 #ifdef  HAVE_SETEUID
 648
 649   /* Modern systems have the seteuid/setegid calls which set only the
 650      effective IDs, which is ideal.  */
 651
 652   if (seteuid (user_uid) < 0)
 653     pfatal_with_name ("user_access: seteuid");
 654
 655 #else   /* Not HAVE_SETEUID.  */
 656
 657 #ifndef HAVE_SETREUID
 658
 659   /* System V has only the setuid/setgid calls to set user/group IDs.
 660      There is an effective ID, which can be set by setuid/setgid.
 661      It can be set (unless you are root) only to either what it already is
 662      (returned by geteuid/getegid, now in make_uid/make_gid),
 663      the real ID (return by getuid/getgid, now in user_uid/user_gid),
 664      or the saved set ID (what the effective ID was before this set-ID
 665      executable (make) was exec'd).  */
 666
 667   if (setuid (user_uid) < 0)
 668     pfatal_with_name ("user_access: setuid");
 669
 670 #else   /* HAVE_SETREUID.  */
 671
 672   /* In 4BSD, the setreuid/setregid calls set both the real and effective IDs.
 673      They may be set to themselves or each other.  So you have two alternatives
 674      at any one time.  If you use setuid/setgid, the effective will be set to
 675      the real, leaving only one alternative.  Using setreuid/setregid, however,
 676      you can toggle between your two alternatives by swapping the values in a
 677      single setreuid or setregid call.  */
 678
 679   if (setreuid (make_uid, user_uid) < 0)
 680     pfatal_with_name ("user_access: setreuid");
 681
 682 #endif  /* Not HAVE_SETREUID.  */
 683 #endif  /* HAVE_SETEUID.  */
 684
 685 #ifdef  HAVE_SETEGID
 686   if (setegid (user_gid) < 0)
 687     pfatal_with_name ("user_access: setegid");
 688 #else
 689 #ifndef HAVE_SETREGID
 690   if (setgid (user_gid) < 0)
 691     pfatal_with_name ("user_access: setgid");
 692 #else
 693   if (setregid (make_gid, user_gid) < 0)
 694     pfatal_with_name ("user_access: setregid");
 695 #endif
 696 #endif
 697
 698   current_access = user;
 699
 700   log_access (_("User access"));
 701
 702 #endif  /* GETLOADAVG_PRIVILEGED */
 703 }
 704
 705 /* Give the process appropriate permissions for access to
 706    make data (i.e., the load average).  */
 707 void
 708 make_access (void)
 709 {
 710 #ifdef  GETLOADAVG_PRIVILEGED
 711
 712   if (!access_inited)
 713     init_access ();
 714
 715   if (current_access == make)
 716     return;
 717
 718   /* See comments in user_access, above.  */
 719
 720 #ifdef  HAVE_SETEUID
 721   if (seteuid (make_uid) < 0)
 722     pfatal_with_name ("make_access: seteuid");
 723 #else
 724 #ifndef HAVE_SETREUID
 725   if (setuid (make_uid) < 0)
 726     pfatal_with_name ("make_access: setuid");
 727 #else
 728   if (setreuid (user_uid, make_uid) < 0)
 729     pfatal_with_name ("make_access: setreuid");
 730 #endif
 731 #endif
 732
 733 #ifdef  HAVE_SETEGID
 734   if (setegid (make_gid) < 0)
 735     pfatal_with_name ("make_access: setegid");
 736 #else
 737 #ifndef HAVE_SETREGID
 738   if (setgid (make_gid) < 0)
 739     pfatal_with_name ("make_access: setgid");
 740 #else
 741   if (setregid (user_gid, make_gid) < 0)
 742     pfatal_with_name ("make_access: setregid");
 743 #endif
 744 #endif
 745
 746   current_access = make;
 747
 748   log_access (_("Make access"));
 749
 750 #endif  /* GETLOADAVG_PRIVILEGED */
 751 }
 752
 753 /* Give the process appropriate permissions for a child process.
 754    This is like user_access, but you can't get back to make_access.  */
 755 void
 756 child_access (void)
 757 {
 758 #ifdef  GETLOADAVG_PRIVILEGED
 759
 760   if (!access_inited)
 761     abort ();
 762
 763   /* Set both the real and effective UID and GID to the user's.
 764      They cannot be changed back to make's.  */
 765
 766 #ifndef HAVE_SETREUID
 767   if (setuid (user_uid) < 0)
 768     pfatal_with_name ("child_access: setuid");
 769 #else
 770   if (setreuid (user_uid, user_uid) < 0)
 771     pfatal_with_name ("child_access: setreuid");
 772 #endif
 773
 774 #ifndef HAVE_SETREGID
 775   if (setgid (user_gid) < 0)
 776     pfatal_with_name ("child_access: setgid");
 777 #else
 778   if (setregid (user_gid, user_gid) < 0)
 779     pfatal_with_name ("child_access: setregid");
 780 #endif
 781
 782   log_access (_("Child access"));
 783
 784 #endif  /* GETLOADAVG_PRIVILEGED */
 785 }
 786 \f
 787 #ifdef NEED_GET_PATH_MAX
 788 unsigned int
 789 get_path_max (void)
 790 {
 791   static unsigned int value;
 792
 793   if (value == 0)
 794     {
 795       long int x = pathconf ("/", _PC_PATH_MAX);
 796       if (x > 0)
 797         value = x;
 798       else
 799         return MAXPATHLEN;
 800     }
 801
 802   return value;
 803 }
 804 #endif