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 (const char *s)
 436 {
 437   while (*s != '\0' && !isblank ((unsigned char)*s))
 438     ++s;
 439   return (char *)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 /* Free a chain of `struct nameseq'. Each nameseq->name is freed
 529    as well.  Can be used on `struct dep' chains.*/
 530
 531 void
 532 free_ns_chain (struct nameseq *n)
 533 {
 534   register struct nameseq *tmp;
 535
 536   while (n != 0)
 537   {
 538     if (n->name != 0)
 539       free (n->name);
 540
 541     tmp = n;
 542
 543     n = n->next;
 544
 545     free (tmp);
 546   }
 547
 548 }\f
 549 #ifdef  iAPX286
 550 /* The losing compiler on this machine can't handle this macro.  */
 551
 552 char *
 553 dep_name (struct dep *dep)
 554 {
 555   return dep->name == 0 ? dep->file->name : dep->name;
 556 }
 557 #endif
 558 \f
 559 #ifdef  GETLOADAVG_PRIVILEGED
 560
 561 #ifdef POSIX
 562
 563 /* Hopefully if a system says it's POSIX.1 and has the setuid and setgid
 564    functions, they work as POSIX.1 says.  Some systems (Alpha OSF/1 1.2,
 565    for example) which claim to be POSIX.1 also have the BSD setreuid and
 566    setregid functions, but they don't work as in BSD and only the POSIX.1
 567    way works.  */
 568
 569 #undef HAVE_SETREUID
 570 #undef HAVE_SETREGID
 571
 572 #else   /* Not POSIX.  */
 573
 574 /* Some POSIX.1 systems have the seteuid and setegid functions.  In a
 575    POSIX-like system, they are the best thing to use.  However, some
 576    non-POSIX systems have them too but they do not work in the POSIX style
 577    and we must use setreuid and setregid instead.  */
 578
 579 #undef HAVE_SETEUID
 580 #undef HAVE_SETEGID
 581
 582 #endif  /* POSIX.  */
 583
 584 #ifndef HAVE_UNISTD_H
 585 extern int getuid (), getgid (), geteuid (), getegid ();
 586 extern int setuid (), setgid ();
 587 #ifdef HAVE_SETEUID
 588 extern int seteuid ();
 589 #else
 590 #ifdef  HAVE_SETREUID
 591 extern int setreuid ();
 592 #endif  /* Have setreuid.  */
 593 #endif  /* Have seteuid.  */
 594 #ifdef HAVE_SETEGID
 595 extern int setegid ();
 596 #else
 597 #ifdef  HAVE_SETREGID
 598 extern int setregid ();
 599 #endif  /* Have setregid.  */
 600 #endif  /* Have setegid.  */
 601 #endif  /* No <unistd.h>.  */
 602
 603 /* Keep track of the user and group IDs for user- and make- access.  */
 604 static int user_uid = -1, user_gid = -1, make_uid = -1, make_gid = -1;
 605 #define access_inited   (user_uid != -1)
 606 static enum { make, user } current_access;
 607
 608
 609 /* Under -d, write a message describing the current IDs.  */
 610
 611 static void
 612 log_access (char *flavor)
 613 {
 614   if (! ISDB (DB_JOBS))
 615     return;
 616
 617   /* All the other debugging messages go to stdout,
 618      but we write this one to stderr because it might be
 619      run in a child fork whose stdout is piped.  */
 620
 621   fprintf (stderr, _("%s: user %lu (real %lu), group %lu (real %lu)\n"),
 622            flavor, (unsigned long) geteuid (), (unsigned long) getuid (),
 623            (unsigned long) getegid (), (unsigned long) getgid ());
 624   fflush (stderr);
 625 }
 626
 627
 628 static void
 629 init_access (void)
 630 {
 631 #ifndef VMS
 632   user_uid = getuid ();
 633   user_gid = getgid ();
 634
 635   make_uid = geteuid ();
 636   make_gid = getegid ();
 637
 638   /* Do these ever fail?  */
 639   if (user_uid == -1 || user_gid == -1 || make_uid == -1 || make_gid == -1)
 640     pfatal_with_name ("get{e}[gu]id");
 641
 642   log_access (_("Initialized access"));
 643
 644   current_access = make;
 645 #endif
 646 }
 647
 648 #endif  /* GETLOADAVG_PRIVILEGED */
 649
 650 /* Give the process appropriate permissions for access to
 651    user data (i.e., to stat files, or to spawn a child process).  */
 652 void
 653 user_access (void)
 654 {
 655 #ifdef  GETLOADAVG_PRIVILEGED
 656
 657   if (!access_inited)
 658     init_access ();
 659
 660   if (current_access == user)
 661     return;
 662
 663   /* We are in "make access" mode.  This means that the effective user and
 664      group IDs are those of make (if it was installed setuid or setgid).
 665      We now want to set the effective user and group IDs to the real IDs,
 666      which are the IDs of the process that exec'd make.  */
 667
 668 #ifdef  HAVE_SETEUID
 669
 670   /* Modern systems have the seteuid/setegid calls which set only the
 671      effective IDs, which is ideal.  */
 672
 673   if (seteuid (user_uid) < 0)
 674     pfatal_with_name ("user_access: seteuid");
 675
 676 #else   /* Not HAVE_SETEUID.  */
 677
 678 #ifndef HAVE_SETREUID
 679
 680   /* System V has only the setuid/setgid calls to set user/group IDs.
 681      There is an effective ID, which can be set by setuid/setgid.
 682      It can be set (unless you are root) only to either what it already is
 683      (returned by geteuid/getegid, now in make_uid/make_gid),
 684      the real ID (return by getuid/getgid, now in user_uid/user_gid),
 685      or the saved set ID (what the effective ID was before this set-ID
 686      executable (make) was exec'd).  */
 687
 688   if (setuid (user_uid) < 0)
 689     pfatal_with_name ("user_access: setuid");
 690
 691 #else   /* HAVE_SETREUID.  */
 692
 693   /* In 4BSD, the setreuid/setregid calls set both the real and effective IDs.
 694      They may be set to themselves or each other.  So you have two alternatives
 695      at any one time.  If you use setuid/setgid, the effective will be set to
 696      the real, leaving only one alternative.  Using setreuid/setregid, however,
 697      you can toggle between your two alternatives by swapping the values in a
 698      single setreuid or setregid call.  */
 699
 700   if (setreuid (make_uid, user_uid) < 0)
 701     pfatal_with_name ("user_access: setreuid");
 702
 703 #endif  /* Not HAVE_SETREUID.  */
 704 #endif  /* HAVE_SETEUID.  */
 705
 706 #ifdef  HAVE_SETEGID
 707   if (setegid (user_gid) < 0)
 708     pfatal_with_name ("user_access: setegid");
 709 #else
 710 #ifndef HAVE_SETREGID
 711   if (setgid (user_gid) < 0)
 712     pfatal_with_name ("user_access: setgid");
 713 #else
 714   if (setregid (make_gid, user_gid) < 0)
 715     pfatal_with_name ("user_access: setregid");
 716 #endif
 717 #endif
 718
 719   current_access = user;
 720
 721   log_access (_("User access"));
 722
 723 #endif  /* GETLOADAVG_PRIVILEGED */
 724 }
 725
 726 /* Give the process appropriate permissions for access to
 727    make data (i.e., the load average).  */
 728 void
 729 make_access (void)
 730 {
 731 #ifdef  GETLOADAVG_PRIVILEGED
 732
 733   if (!access_inited)
 734     init_access ();
 735
 736   if (current_access == make)
 737     return;
 738
 739   /* See comments in user_access, above.  */
 740
 741 #ifdef  HAVE_SETEUID
 742   if (seteuid (make_uid) < 0)
 743     pfatal_with_name ("make_access: seteuid");
 744 #else
 745 #ifndef HAVE_SETREUID
 746   if (setuid (make_uid) < 0)
 747     pfatal_with_name ("make_access: setuid");
 748 #else
 749   if (setreuid (user_uid, make_uid) < 0)
 750     pfatal_with_name ("make_access: setreuid");
 751 #endif
 752 #endif
 753
 754 #ifdef  HAVE_SETEGID
 755   if (setegid (make_gid) < 0)
 756     pfatal_with_name ("make_access: setegid");
 757 #else
 758 #ifndef HAVE_SETREGID
 759   if (setgid (make_gid) < 0)
 760     pfatal_with_name ("make_access: setgid");
 761 #else
 762   if (setregid (user_gid, make_gid) < 0)
 763     pfatal_with_name ("make_access: setregid");
 764 #endif
 765 #endif
 766
 767   current_access = make;
 768
 769   log_access (_("Make access"));
 770
 771 #endif  /* GETLOADAVG_PRIVILEGED */
 772 }
 773
 774 /* Give the process appropriate permissions for a child process.
 775    This is like user_access, but you can't get back to make_access.  */
 776 void
 777 child_access (void)
 778 {
 779 #ifdef  GETLOADAVG_PRIVILEGED
 780
 781   if (!access_inited)
 782     abort ();
 783
 784   /* Set both the real and effective UID and GID to the user's.
 785      They cannot be changed back to make's.  */
 786
 787 #ifndef HAVE_SETREUID
 788   if (setuid (user_uid) < 0)
 789     pfatal_with_name ("child_access: setuid");
 790 #else
 791   if (setreuid (user_uid, user_uid) < 0)
 792     pfatal_with_name ("child_access: setreuid");
 793 #endif
 794
 795 #ifndef HAVE_SETREGID
 796   if (setgid (user_gid) < 0)
 797     pfatal_with_name ("child_access: setgid");
 798 #else
 799   if (setregid (user_gid, user_gid) < 0)
 800     pfatal_with_name ("child_access: setregid");
 801 #endif
 802
 803   log_access (_("Child access"));
 804
 805 #endif  /* GETLOADAVG_PRIVILEGED */
 806 }
 807 \f
 808 #ifdef NEED_GET_PATH_MAX
 809 unsigned int
 810 get_path_max (void)
 811 {
 812   static unsigned int value;
 813
 814   if (value == 0)
 815     {
 816       long int x = pathconf ("/", _PC_PATH_MAX);
 817       if (x > 0)
 818         value = x;
 819       else
 820         return MAXPATHLEN;
 821     }
 822
 823   return value;
 824 }
 825 #endif