gnu/dist/gmake/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 HAVE_VPRINTF || HAVE_DOPRNT
  34 # define HAVE_STDVARARGS 1
  35 # if __STDC__
  36 #  include <stdarg.h>
  37 #  define VA_START(args, lastarg) va_start(args, lastarg)
  38 # else
  39 #  include <varargs.h>
  40 #  define VA_START(args, lastarg) va_start(args)
  41 # endif
  42 # if HAVE_VPRINTF
  43 #  define VA_PRINTF(fp, lastarg, args) vfprintf((fp), (lastarg), (args))
  44 # else
  45 #  define VA_PRINTF(fp, lastarg, args) _doprnt((lastarg), (args), (fp))
  46 # endif
  47 # define VA_END(args) va_end(args)
  48 #else
  49 /* # undef HAVE_STDVARARGS */
  50 # define va_alist a1, a2, a3, a4, a5, a6, a7, a8
  51 # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
  52 # define VA_START(args, lastarg)
  53 # define VA_PRINTF(fp, lastarg, args) fprintf((fp), (lastarg), va_alist)
  54 # define VA_END(args)
  55 #endif
  56
  57
  58 /* Compare strings *S1 and *S2.
  59    Return negative if the first is less, positive if it is greater,
  60    zero if they are equal.  */
  61
  62 int
  63 alpha_compare (v1, v2)
  64      const void *v1, *v2;
  65 {
  66   const char *s1 = *((char **)v1);
  67   const char *s2 = *((char **)v2);
  68
  69   if (*s1 != *s2)
  70     return *s1 - *s2;
  71   return strcmp (s1, s2);
  72 }
  73 \f
  74 /* Discard each backslash-newline combination from LINE.
  75    Backslash-backslash-newline combinations become backslash-newlines.
  76    This is done by copying the text at LINE into itself.  */
  77
  78 void
  79 collapse_continuations (line)
  80      char *line;
  81 {
  82   register char *in, *out, *p;
  83   register int backslash;
  84   register unsigned int bs_write;
  85
  86   in = strchr (line, '\n');
  87   if (in == 0)
  88     return;
  89
  90   out = in;
  91   while (out > line && out[-1] == '\\')
  92     --out;
  93
  94   while (*in != '\0')
  95     {
  96       /* BS_WRITE gets the number of quoted backslashes at
  97          the end just before IN, and BACKSLASH gets nonzero
  98          if the next character is quoted.  */
  99       backslash = 0;
 100       bs_write = 0;
 101       for (p = in - 1; p >= line && *p == '\\'; --p)
 102         {
 103           if (backslash)
 104             ++bs_write;
 105           backslash = !backslash;
 106
 107           /* It should be impossible to go back this far without exiting,
 108              but if we do, we can't get the right answer.  */
 109           if (in == out - 1)
 110             abort ();
 111         }
 112
 113       /* Output the appropriate number of backslashes.  */
 114       while (bs_write-- > 0)
 115         *out++ = '\\';
 116
 117       /* Skip the newline.  */
 118       ++in;
 119
 120       /* If the newline is quoted, discard following whitespace
 121          and any preceding whitespace; leave just one space.  */
 122       if (backslash)
 123         {
 124           in = next_token (in);
 125           while (out > line && isblank ((unsigned char)out[-1]))
 126             --out;
 127           *out++ = ' ';
 128         }
 129       else
 130         /* If the newline isn't quoted, put it in the output.  */
 131         *out++ = '\n';
 132
 133       /* Now copy the following line to the output.
 134          Stop when we find backslashes followed by a newline.  */
 135       while (*in != '\0')
 136         if (*in == '\\')
 137           {
 138             p = in + 1;
 139             while (*p == '\\')
 140               ++p;
 141             if (*p == '\n')
 142               {
 143                 in = p;
 144                 break;
 145               }
 146             while (in < p)
 147               *out++ = *in++;
 148           }
 149         else
 150           *out++ = *in++;
 151     }
 152
 153   *out = '\0';
 154 }
 155
 156
 157 /* Remove comments from LINE.
 158    This is done by copying the text at LINE onto itself.  */
 159
 160 void
 161 remove_comments (line)
 162      char *line;
 163 {
 164   char *comment;
 165
 166   comment = find_char_unquote (line, '#', 0, 0);
 167
 168   if (comment != 0)
 169     /* Cut off the line at the #.  */
 170     *comment = '\0';
 171 }
 172 \f
 173 /* Print N spaces (used in debug for target-depth).  */
 174
 175 void
 176 print_spaces (n)
 177      unsigned int n;
 178 {
 179   while (n-- > 0)
 180     putchar (' ');
 181 }
 182
 183 \f
 184 /* Return a newly-allocated string whose contents
 185    concatenate those of s1, s2, s3.  */
 186
 187 char *
 188 concat (s1, s2, s3)
 189      const char *s1, *s2, *s3;
 190 {
 191   unsigned int len1, len2, len3;
 192   char *result;
 193
 194   len1 = *s1 != '\0' ? strlen (s1) : 0;
 195   len2 = *s2 != '\0' ? strlen (s2) : 0;
 196   len3 = *s3 != '\0' ? strlen (s3) : 0;
 197
 198   result = (char *) xmalloc (len1 + len2 + len3 + 1);
 199
 200   if (*s1 != '\0')
 201     bcopy (s1, result, len1);
 202   if (*s2 != '\0')
 203     bcopy (s2, result + len1, len2);
 204   if (*s3 != '\0')
 205     bcopy (s3, result + len1 + len2, len3);
 206   *(result + len1 + len2 + len3) = '\0';
 207
 208   return result;
 209 }
 210 \f
 211 /* Print a message on stdout.  */
 212
 213 void
 214 #if __STDC__ && HAVE_STDVARARGS
 215 message (int prefix, const char *fmt, ...)
 216 #else
 217 message (prefix, fmt, va_alist)
 218      int prefix;
 219      const char *fmt;
 220      va_dcl
 221 #endif
 222 {
 223 #if HAVE_STDVARARGS
 224   va_list args;
 225 #endif
 226
 227   log_working_directory (1);
 228
 229   if (fmt != 0)
 230     {
 231       if (prefix)
 232         {
 233           if (makelevel == 0)
 234             printf ("%s: ", program);
 235           else
 236             printf ("%s[%u]: ", program, makelevel);
 237         }
 238       VA_START (args, fmt);
 239       VA_PRINTF (stdout, fmt, args);
 240       VA_END (args);
 241       putchar ('\n');
 242     }
 243
 244   fflush (stdout);
 245 }
 246
 247 /* Print an error message.  */
 248
 249 void
 250 #if __STDC__ && HAVE_STDVARARGS
 251 error (const struct floc *flocp, const char *fmt, ...)
 252 #else
 253 error (flocp, fmt, va_alist)
 254      const struct floc *flocp;
 255      const char *fmt;
 256      va_dcl
 257 #endif
 258 {
 259 #if HAVE_STDVARARGS
 260   va_list args;
 261 #endif
 262
 263   log_working_directory (1);
 264
 265   if (flocp && flocp->filenm)
 266     fprintf (stderr, "%s:%lu: ", flocp->filenm, flocp->lineno);
 267   else if (makelevel == 0)
 268     fprintf (stderr, "%s: ", program);
 269   else
 270     fprintf (stderr, "%s[%u]: ", program, makelevel);
 271
 272   VA_START(args, fmt);
 273   VA_PRINTF (stderr, fmt, args);
 274   VA_END (args);
 275
 276   putc ('\n', stderr);
 277   fflush (stderr);
 278 }
 279
 280 /* Print an error message and exit.  */
 281
 282 void
 283 #if __STDC__ && HAVE_STDVARARGS
 284 fatal (const struct floc *flocp, const char *fmt, ...)
 285 #else
 286 fatal (flocp, fmt, va_alist)
 287      const struct floc *flocp;
 288      const char *fmt;
 289      va_dcl
 290 #endif
 291 {
 292 #if HAVE_STDVARARGS
 293   va_list args;
 294 #endif
 295
 296   log_working_directory (1);
 297
 298   if (flocp && flocp->filenm)
 299     fprintf (stderr, "%s:%lu: *** ", flocp->filenm, flocp->lineno);
 300   else if (makelevel == 0)
 301     fprintf (stderr, "%s: *** ", program);
 302   else
 303     fprintf (stderr, "%s[%u]: *** ", program, makelevel);
 304
 305   VA_START(args, fmt);
 306   VA_PRINTF (stderr, fmt, args);
 307   VA_END (args);
 308
 309   fputs (_(".  Stop.\n"), stderr);
 310
 311   die (2);
 312 }
 313
 314 #ifndef HAVE_STRERROR
 315
 316 #undef  strerror
 317
 318 char *
 319 strerror (errnum)
 320      int errnum;
 321 {
 322   extern int errno, sys_nerr;
 323 #ifndef __DECC
 324   extern char *sys_errlist[];
 325 #endif
 326   static char buf[] = "Unknown error 12345678901234567890";
 327
 328   if (errno < sys_nerr)
 329     return sys_errlist[errnum];
 330
 331   sprintf (buf, _("Unknown error %d"), errnum);
 332   return buf;
 333 }
 334 #endif
 335
 336 /* Print an error message from errno.  */
 337
 338 void
 339 perror_with_name (str, name)
 340      const char *str, *name;
 341 {
 342   error (NILF, _("%s%s: %s"), str, name, strerror (errno));
 343 }
 344
 345 /* Print an error message from errno and exit.  */
 346
 347 void
 348 pfatal_with_name (name)
 349      const char *name;
 350 {
 351   fatal (NILF, _("%s: %s"), name, strerror (errno));
 352
 353   /* NOTREACHED */
 354 }
 355 \f
 356 /* Like malloc but get fatal error if memory is exhausted.  */
 357 /* Don't bother if we're using dmalloc; it provides these for us.  */
 358
 359 #ifndef HAVE_DMALLOC_H
 360
 361 #undef xmalloc
 362 #undef xrealloc
 363 #undef xstrdup
 364
 365 char *
 366 xmalloc (size)
 367      unsigned int size;
 368 {
 369   char *result = (char *) malloc (size);
 370   if (result == 0)
 371     fatal (NILF, _("virtual memory exhausted"));
 372   return result;
 373 }
 374
 375
 376 char *
 377 xrealloc (ptr, size)
 378      char *ptr;
 379      unsigned int size;
 380 {
 381   char *result;
 382
 383   /* Some older implementations of realloc() don't conform to ANSI.  */
 384   result = ptr ? realloc (ptr, size) : malloc (size);
 385   if (result == 0)
 386     fatal (NILF, _("virtual memory exhausted"));
 387   return result;
 388 }
 389
 390
 391 char *
 392 xstrdup (ptr)
 393      const char *ptr;
 394 {
 395   char *result;
 396
 397 #ifdef HAVE_STRDUP
 398   result = strdup (ptr);
 399 #else
 400   result = (char *) malloc (strlen (ptr) + 1);
 401 #endif
 402
 403   if (result == 0)
 404     fatal (NILF, _("virtual memory exhausted"));
 405
 406 #ifdef HAVE_STRDUP
 407   return result;
 408 #else
 409   return strcpy(result, ptr);
 410 #endif
 411 }
 412
 413 #endif  /* HAVE_DMALLOC_H */
 414
 415 char *
 416 savestring (str, length)
 417      const char *str;
 418      unsigned int length;
 419 {
 420   register char *out = (char *) xmalloc (length + 1);
 421   if (length > 0)
 422     bcopy (str, out, length);
 423   out[length] = '\0';
 424   return out;
 425 }
 426 \f
 427 /* Search string BIG (length BLEN) for an occurrence of
 428    string SMALL (length SLEN).  Return a pointer to the
 429    beginning of the first occurrence, or return nil if none found.  */
 430
 431 char *
 432 sindex (big, blen, small, slen)
 433      const char *big;
 434      unsigned int blen;
 435      const char *small;
 436      unsigned int slen;
 437 {
 438   if (!blen)
 439     blen = strlen (big);
 440   if (!slen)
 441     slen = strlen (small);
 442
 443   if (slen && blen >= slen)
 444     {
 445       register unsigned int b;
 446
 447       /* Quit when there's not enough room left for the small string.  */
 448       --slen;
 449       blen -= slen;
 450
 451       for (b = 0; b < blen; ++b, ++big)
 452         if (*big == *small && strneq (big + 1, small + 1, slen))
 453           return (char *)big;
 454     }
 455
 456   return 0;
 457 }
 458
 459 /* Limited INDEX:
 460    Search through the string STRING, which ends at LIMIT, for the character C.
 461    Returns a pointer to the first occurrence, or nil if none is found.
 462    Like INDEX except that the string searched ends where specified
 463    instead of at the first null.  */
 464
 465 char *
 466 lindex (s, limit, c)
 467      register const char *s, *limit;
 468      int c;
 469 {
 470   while (s < limit)
 471     if (*s++ == c)
 472       return (char *)(s - 1);
 473
 474   return 0;
 475 }
 476 \f
 477 /* Return the address of the first whitespace or null in the string S.  */
 478
 479 char *
 480 end_of_token (s)
 481      char *s;
 482 {
 483   while (*s != '\0' && !isblank ((unsigned char)*s))
 484     ++s;
 485   return s;
 486 }
 487
 488 #ifdef WINDOWS32
 489 /*
 490  * Same as end_of_token, but take into account a stop character
 491  */
 492 char *
 493 end_of_token_w32 (s, stopchar)
 494      char *s;
 495      char stopchar;
 496 {
 497   register char *p = s;
 498   register int backslash = 0;
 499
 500   while (*p != '\0' && *p != stopchar
 501          && (backslash || !isblank ((unsigned char)*p)))
 502     {
 503       if (*p++ == '\\')
 504         {
 505           backslash = !backslash;
 506           while (*p == '\\')
 507             {
 508               backslash = !backslash;
 509               ++p;
 510             }
 511         }
 512       else
 513         backslash = 0;
 514     }
 515
 516   return p;
 517 }
 518 #endif
 519
 520 /* Return the address of the first nonwhitespace or null in the string S.  */
 521
 522 char *
 523 next_token (s)
 524      const char *s;
 525 {
 526   while (isblank ((unsigned char)*s))
 527     ++s;
 528   return (char *)s;
 529 }
 530
 531 /* Find the next token in PTR; return the address of it, and store the
 532    length of the token into *LENGTHPTR if LENGTHPTR is not nil.  */
 533
 534 char *
 535 find_next_token (ptr, lengthptr)
 536      char **ptr;
 537      unsigned int *lengthptr;
 538 {
 539   char *p = next_token (*ptr);
 540   char *end;
 541
 542   if (*p == '\0')
 543     return 0;
 544
 545   *ptr = end = end_of_token (p);
 546   if (lengthptr != 0)
 547     *lengthptr = end - p;
 548   return p;
 549 }
 550 \f
 551 /* Copy a chain of `struct dep', making a new chain
 552    with the same contents as the old one.  */
 553
 554 struct dep *
 555 copy_dep_chain (d)
 556      register struct dep *d;
 557 {
 558   register struct dep *c;
 559   struct dep *firstnew = 0;
 560   struct dep *lastnew = 0;
 561
 562   while (d != 0)
 563     {
 564       c = (struct dep *) xmalloc (sizeof (struct dep));
 565       bcopy ((char *) d, (char *) c, sizeof (struct dep));
 566       if (c->name != 0)
 567         c->name = xstrdup (c->name);
 568       c->next = 0;
 569       if (firstnew == 0)
 570         firstnew = lastnew = c;
 571       else
 572         lastnew = lastnew->next = c;
 573
 574       d = d->next;
 575     }
 576
 577   return firstnew;
 578 }
 579 \f
 580 #ifdef  iAPX286
 581 /* The losing compiler on this machine can't handle this macro.  */
 582
 583 char *
 584 dep_name (dep)
 585      struct dep *dep;
 586 {
 587   return dep->name == 0 ? dep->file->name : dep->name;
 588 }
 589 #endif
 590 \f
 591 #ifdef  GETLOADAVG_PRIVILEGED
 592
 593 #ifdef POSIX
 594
 595 /* Hopefully if a system says it's POSIX.1 and has the setuid and setgid
 596    functions, they work as POSIX.1 says.  Some systems (Alpha OSF/1 1.2,
 597    for example) which claim to be POSIX.1 also have the BSD setreuid and
 598    setregid functions, but they don't work as in BSD and only the POSIX.1
 599    way works.  */
 600
 601 #undef HAVE_SETREUID
 602 #undef HAVE_SETREGID
 603
 604 #else   /* Not POSIX.  */
 605
 606 /* Some POSIX.1 systems have the seteuid and setegid functions.  In a
 607    POSIX-like system, they are the best thing to use.  However, some
 608    non-POSIX systems have them too but they do not work in the POSIX style
 609    and we must use setreuid and setregid instead.  */
 610
 611 #undef HAVE_SETEUID
 612 #undef HAVE_SETEGID
 613
 614 #endif  /* POSIX.  */
 615
 616 #ifndef HAVE_UNISTD_H
 617 extern int getuid (), getgid (), geteuid (), getegid ();
 618 extern int setuid (), setgid ();
 619 #ifdef HAVE_SETEUID
 620 extern int seteuid ();
 621 #else
 622 #ifdef  HAVE_SETREUID
 623 extern int setreuid ();
 624 #endif  /* Have setreuid.  */
 625 #endif  /* Have seteuid.  */
 626 #ifdef HAVE_SETEGID
 627 extern int setegid ();
 628 #else
 629 #ifdef  HAVE_SETREGID
 630 extern int setregid ();
 631 #endif  /* Have setregid.  */
 632 #endif  /* Have setegid.  */
 633 #endif  /* No <unistd.h>.  */
 634
 635 /* Keep track of the user and group IDs for user- and make- access.  */
 636 static int user_uid = -1, user_gid = -1, make_uid = -1, make_gid = -1;
 637 #define access_inited   (user_uid != -1)
 638 static enum { make, user } current_access;
 639
 640
 641 /* Under -d, write a message describing the current IDs.  */
 642
 643 static void
 644 log_access (flavor)
 645      char *flavor;
 646 {
 647   if (! ISDB (DB_JOBS))
 648     return;
 649
 650   /* All the other debugging messages go to stdout,
 651      but we write this one to stderr because it might be
 652      run in a child fork whose stdout is piped.  */
 653
 654   fprintf (stderr, _("%s: user %lu (real %lu), group %lu (real %lu)\n"),
 655            flavor, (unsigned long) geteuid (), (unsigned long) getuid (),
 656            (unsigned long) getegid (), (unsigned long) getgid ());
 657   fflush (stderr);
 658 }
 659
 660
 661 static void
 662 init_access ()
 663 {
 664 #ifndef VMS
 665   user_uid = getuid ();
 666   user_gid = getgid ();
 667
 668   make_uid = geteuid ();
 669   make_gid = getegid ();
 670
 671   /* Do these ever fail?  */
 672   if (user_uid == -1 || user_gid == -1 || make_uid == -1 || make_gid == -1)
 673     pfatal_with_name ("get{e}[gu]id");
 674
 675   log_access (_("Initialized access"));
 676
 677   current_access = make;
 678 #endif
 679 }
 680
 681 #endif  /* GETLOADAVG_PRIVILEGED */
 682
 683 /* Give the process appropriate permissions for access to
 684    user data (i.e., to stat files, or to spawn a child process).  */
 685 void
 686 user_access ()
 687 {
 688 #ifdef  GETLOADAVG_PRIVILEGED
 689
 690   if (!access_inited)
 691     init_access ();
 692
 693   if (current_access == user)
 694     return;
 695
 696   /* We are in "make access" mode.  This means that the effective user and
 697      group IDs are those of make (if it was installed setuid or setgid).
 698      We now want to set the effective user and group IDs to the real IDs,
 699      which are the IDs of the process that exec'd make.  */
 700
 701 #ifdef  HAVE_SETEUID
 702
 703   /* Modern systems have the seteuid/setegid calls which set only the
 704      effective IDs, which is ideal.  */
 705
 706   if (seteuid (user_uid) < 0)
 707     pfatal_with_name ("user_access: seteuid");
 708
 709 #else   /* Not HAVE_SETEUID.  */
 710
 711 #ifndef HAVE_SETREUID
 712
 713   /* System V has only the setuid/setgid calls to set user/group IDs.
 714      There is an effective ID, which can be set by setuid/setgid.
 715      It can be set (unless you are root) only to either what it already is
 716      (returned by geteuid/getegid, now in make_uid/make_gid),
 717      the real ID (return by getuid/getgid, now in user_uid/user_gid),
 718      or the saved set ID (what the effective ID was before this set-ID
 719      executable (make) was exec'd).  */
 720
 721   if (setuid (user_uid) < 0)
 722     pfatal_with_name ("user_access: setuid");
 723
 724 #else   /* HAVE_SETREUID.  */
 725
 726   /* In 4BSD, the setreuid/setregid calls set both the real and effective IDs.
 727      They may be set to themselves or each other.  So you have two alternatives
 728      at any one time.  If you use setuid/setgid, the effective will be set to
 729      the real, leaving only one alternative.  Using setreuid/setregid, however,
 730      you can toggle between your two alternatives by swapping the values in a
 731      single setreuid or setregid call.  */
 732
 733   if (setreuid (make_uid, user_uid) < 0)
 734     pfatal_with_name ("user_access: setreuid");
 735
 736 #endif  /* Not HAVE_SETREUID.  */
 737 #endif  /* HAVE_SETEUID.  */
 738
 739 #ifdef  HAVE_SETEGID
 740   if (setegid (user_gid) < 0)
 741     pfatal_with_name ("user_access: setegid");
 742 #else
 743 #ifndef HAVE_SETREGID
 744   if (setgid (user_gid) < 0)
 745     pfatal_with_name ("user_access: setgid");
 746 #else
 747   if (setregid (make_gid, user_gid) < 0)
 748     pfatal_with_name ("user_access: setregid");
 749 #endif
 750 #endif
 751
 752   current_access = user;
 753
 754   log_access (_("User access"));
 755
 756 #endif  /* GETLOADAVG_PRIVILEGED */
 757 }
 758
 759 /* Give the process appropriate permissions for access to
 760    make data (i.e., the load average).  */
 761 void
 762 make_access ()
 763 {
 764 #ifdef  GETLOADAVG_PRIVILEGED
 765
 766   if (!access_inited)
 767     init_access ();
 768
 769   if (current_access == make)
 770     return;
 771
 772   /* See comments in user_access, above.  */
 773
 774 #ifdef  HAVE_SETEUID
 775   if (seteuid (make_uid) < 0)
 776     pfatal_with_name ("make_access: seteuid");
 777 #else
 778 #ifndef HAVE_SETREUID
 779   if (setuid (make_uid) < 0)
 780     pfatal_with_name ("make_access: setuid");
 781 #else
 782   if (setreuid (user_uid, make_uid) < 0)
 783     pfatal_with_name ("make_access: setreuid");
 784 #endif
 785 #endif
 786
 787 #ifdef  HAVE_SETEGID
 788   if (setegid (make_gid) < 0)
 789     pfatal_with_name ("make_access: setegid");
 790 #else
 791 #ifndef HAVE_SETREGID
 792   if (setgid (make_gid) < 0)
 793     pfatal_with_name ("make_access: setgid");
 794 #else
 795   if (setregid (user_gid, make_gid) < 0)
 796     pfatal_with_name ("make_access: setregid");
 797 #endif
 798 #endif
 799
 800   current_access = make;
 801
 802   log_access (_("Make access"));
 803
 804 #endif  /* GETLOADAVG_PRIVILEGED */
 805 }
 806
 807 /* Give the process appropriate permissions for a child process.
 808    This is like user_access, but you can't get back to make_access.  */
 809 void
 810 child_access ()
 811 {
 812 #ifdef  GETLOADAVG_PRIVILEGED
 813
 814   if (!access_inited)
 815     abort ();
 816
 817   /* Set both the real and effective UID and GID to the user's.
 818      They cannot be changed back to make's.  */
 819
 820 #ifndef HAVE_SETREUID
 821   if (setuid (user_uid) < 0)
 822     pfatal_with_name ("child_access: setuid");
 823 #else
 824   if (setreuid (user_uid, user_uid) < 0)
 825     pfatal_with_name ("child_access: setreuid");
 826 #endif
 827
 828 #ifndef HAVE_SETREGID
 829   if (setgid (user_gid) < 0)
 830     pfatal_with_name ("child_access: setgid");
 831 #else
 832   if (setregid (user_gid, user_gid) < 0)
 833     pfatal_with_name ("child_access: setregid");
 834 #endif
 835
 836   log_access (_("Child access"));
 837
 838 #endif  /* GETLOADAVG_PRIVILEGED */
 839 }
 840 \f
 841 #ifdef NEED_GET_PATH_MAX
 842 unsigned int
 843 get_path_max ()
 844 {
 845   static unsigned int value;
 846
 847   if (value == 0)
 848     {
 849       long int x = pathconf ("/", _PC_PATH_MAX);
 850       if (x > 0)
 851         value = x;
 852       else
 853         return MAXPATHLEN;
 854     }
 855
 856   return value;
 857 }
 858 #endif
 859 \f
 860
 861 #ifdef HAVE_BROKEN_RESTART
 862
 863 #undef stat
 864 #undef readdir
 865
 866 int
 867 atomic_stat(file, buf)
 868      const char *file;
 869      struct stat *buf;
 870 {
 871   int r;
 872
 873   while ((r = stat (file, buf)) < 0)
 874     if (errno != EINTR)
 875       break;
 876
 877   return r;
 878 }
 879
 880 struct dirent *
 881 atomic_readdir(dir)
 882      DIR *dir;
 883 {
 884   struct dirent *r;
 885
 886   while ((r = readdir (dir)) == NULL)
 887     if (errno != EINTR)
 888       break;
 889
 890   return r;
 891 }
 892
 893 #endif  /* HAVE_BROKEN_RESTART */