usr.bin/make/meta.c

   1 /*      $NetBSD: meta.c,v 1.39 2015/10/10 03:58:59 sjg Exp $ */
   2
   3 /*
   4  * Implement 'meta' mode.
   5  * Adapted from John Birrell's patches to FreeBSD make.
   6  * --sjg
   7  */
   8 /*
   9  * Copyright (c) 2009-2010, Juniper Networks, Inc.
  10  * Portions Copyright (c) 2009, John Birrell.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 #if defined(USE_META)
  34
  35 #ifdef HAVE_CONFIG_H
  36 # include "config.h"
  37 #endif
  38 #include <sys/stat.h>
  39 #include <sys/ioctl.h>
  40 #include <fcntl.h>
  41 #include <libgen.h>
  42 #include <errno.h>
  43 #if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H)
  44 #include <err.h>
  45 #endif
  46
  47 #include "make.h"
  48 #include "job.h"
  49
  50 #ifdef HAVE_FILEMON_H
  51 # include <filemon.h>
  52 #endif
  53 #if !defined(USE_FILEMON) && defined(FILEMON_SET_FD)
  54 # define USE_FILEMON
  55 #endif
  56
  57 static BuildMon Mybm;                   /* for compat */
  58 static Lst metaBailiwick;               /* our scope of control */
  59 static Lst metaIgnorePaths;             /* paths we deliberately ignore */
  60
  61 #ifndef MAKE_META_IGNORE_PATHS
  62 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS"
  63 #endif
  64
  65 Boolean useMeta = FALSE;
  66 static Boolean useFilemon = FALSE;
  67 static Boolean writeMeta = FALSE;
  68 static Boolean metaEnv = FALSE;         /* don't save env unless asked */
  69 static Boolean metaVerbose = FALSE;
  70 static Boolean metaIgnoreCMDs = FALSE;  /* ignore CMDs in .meta files */
  71 static Boolean metaCurdirOk = FALSE;    /* write .meta in .CURDIR Ok? */
  72 static Boolean metaSilent = FALSE;      /* if we have a .meta be SILENT */
  73
  74 extern Boolean forceJobs;
  75 extern Boolean comatMake;
  76 extern char    **environ;
  77
  78 #define MAKE_META_PREFIX        ".MAKE.META.PREFIX"
  79
  80 #ifndef N2U
  81 # define N2U(n, u)   (((n) + ((u) - 1)) / (u))
  82 #endif
  83 #ifndef ROUNDUP
  84 # define ROUNDUP(n, u)   (N2U((n), (u)) * (u))
  85 #endif
  86
  87 #if !defined(HAVE_STRSEP)
  88 # define strsep(s, d) stresep((s), (d), 0)
  89 #endif
  90
  91 /*
  92  * Filemon is a kernel module which snoops certain syscalls.
  93  *
  94  * C chdir
  95  * E exec
  96  * F [v]fork
  97  * L [sym]link
  98  * M rename
  99  * R read
 100  * W write
 101  * S stat
 102  *
 103  * See meta_oodate below - we mainly care about 'E' and 'R'.
 104  *
 105  * We can still use meta mode without filemon, but
 106  * the benefits are more limited.
 107  */
 108 #ifdef USE_FILEMON
 109 # ifndef _PATH_FILEMON
 110 #   define _PATH_FILEMON "/dev/filemon"
 111 # endif
 112
 113 /*
 114  * Open the filemon device.
 115  */
 116 static void
 117 filemon_open(BuildMon *pbm)
 118 {
 119     int retry;
 120
 121     pbm->mon_fd = pbm->filemon_fd = -1;
 122     if (!useFilemon)
 123         return;
 124
 125     for (retry = 5; retry >= 0; retry--) {
 126         if ((pbm->filemon_fd = open(_PATH_FILEMON, O_RDWR)) >= 0)
 127             break;
 128     }
 129
 130     if (pbm->filemon_fd < 0) {
 131         useFilemon = FALSE;
 132         warn("Could not open %s", _PATH_FILEMON);
 133         return;
 134     }
 135
 136     /*
 137      * We use a file outside of '.'
 138      * to avoid a FreeBSD kernel bug where unlink invalidates
 139      * cwd causing getcwd to do a lot more work.
 140      * We only care about the descriptor.
 141      */
 142     pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL);
 143     if (ioctl(pbm->filemon_fd, FILEMON_SET_FD, &pbm->mon_fd) < 0) {
 144         err(1, "Could not set filemon file descriptor!");
 145     }
 146     /* we don't need these once we exec */
 147     (void)fcntl(pbm->mon_fd, F_SETFD, 1);
 148     (void)fcntl(pbm->filemon_fd, F_SETFD, 1);
 149 }
 150
 151 /*
 152  * Read the build monitor output file and write records to the target's
 153  * metadata file.
 154  */
 155 static void
 156 filemon_read(FILE *mfp, int fd)
 157 {
 158     char buf[BUFSIZ];
 159     int n;
 160
 161     /* Check if we're not writing to a meta data file.*/
 162     if (mfp == NULL) {
 163         if (fd >= 0)
 164             close(fd);                  /* not interested */
 165         return;
 166     }
 167     /* rewind */
 168     (void)lseek(fd, (off_t)0, SEEK_SET);
 169
 170     fprintf(mfp, "\n-- filemon acquired metadata --\n");
 171
 172     while ((n = read(fd, buf, sizeof(buf))) > 0) {
 173         fwrite(buf, 1, n, mfp);
 174     }
 175     fflush(mfp);
 176     close(fd);
 177 }
 178 #endif
 179
 180 /*
 181  * when realpath() fails,
 182  * we use this, to clean up ./ and ../
 183  */
 184 static void
 185 eat_dots(char *buf, size_t bufsz, int dots)
 186 {
 187     char *cp;
 188     char *cp2;
 189     const char *eat;
 190     size_t eatlen;
 191
 192     switch (dots) {
 193     case 1:
 194         eat = "/./";
 195         eatlen = 2;
 196         break;
 197     case 2:
 198         eat = "/../";
 199         eatlen = 3;
 200         break;
 201     default:
 202         return;
 203     }
 204
 205     do {
 206         cp = strstr(buf, eat);
 207         if (cp) {
 208             cp2 = cp + eatlen;
 209             if (dots == 2 && cp > buf) {
 210                 do {
 211                     cp--;
 212                 } while (cp > buf && *cp != '/');
 213             }
 214             if (*cp == '/') {
 215                 strlcpy(cp, cp2, bufsz - (cp - buf));
 216             } else {
 217                 return;                 /* can't happen? */
 218             }
 219         }
 220     } while (cp);
 221 }
 222
 223 static char *
 224 meta_name(struct GNode *gn, char *mname, size_t mnamelen,
 225           const char *dname,
 226           const char *tname)
 227 {
 228     char buf[MAXPATHLEN];
 229     char cwd[MAXPATHLEN];
 230     char *rp;
 231     char *cp;
 232     char *tp;
 233     char *p[4];                         /* >= number of possible uses */
 234     int i;
 235
 236     i = 0;
 237     if (!dname)
 238         dname = Var_Value(".OBJDIR", gn, &p[i++]);
 239     if (!tname)
 240         tname = Var_Value(TARGET, gn, &p[i++]);
 241
 242     if (realpath(dname, cwd))
 243         dname = cwd;
 244
 245     /*
 246      * Weed out relative paths from the target file name.
 247      * We have to be careful though since if target is a
 248      * symlink, the result will be unstable.
 249      * So we use realpath() just to get the dirname, and leave the
 250      * basename as given to us.
 251      */
 252     if ((cp = strrchr(tname, '/'))) {
 253         if (realpath(tname, buf)) {
 254             if ((rp = strrchr(buf, '/'))) {
 255                 rp++;
 256                 cp++;
 257                 if (strcmp(cp, rp) != 0)
 258                     strlcpy(rp, cp, sizeof(buf) - (rp - buf));
 259             }
 260             tname = buf;
 261         } else {
 262             /*
 263              * We likely have a directory which is about to be made.
 264              * We pretend realpath() succeeded, to have a chance
 265              * of generating the same meta file name that we will
 266              * next time through.
 267              */
 268             if (tname[0] == '/') {
 269                 strlcpy(buf, tname, sizeof(buf));
 270             } else {
 271                 snprintf(buf, sizeof(buf), "%s/%s", cwd, tname);
 272             }
 273             eat_dots(buf, sizeof(buf), 1);      /* ./ */
 274             eat_dots(buf, sizeof(buf), 2);      /* ../ */
 275             tname = buf;
 276         }
 277     }
 278     /* on some systems dirname may modify its arg */
 279     tp = bmake_strdup(tname);
 280     if (strcmp(dname, dirname(tp)) == 0)
 281         snprintf(mname, mnamelen, "%s.meta", tname);
 282     else {
 283         snprintf(mname, mnamelen, "%s/%s.meta", dname, tname);
 284
 285         /*
 286          * Replace path separators in the file name after the
 287          * current object directory path.
 288          */
 289         cp = mname + strlen(dname) + 1;
 290
 291         while (*cp != '\0') {
 292             if (*cp == '/')
 293                 *cp = '_';
 294             cp++;
 295         }
 296     }
 297     free(tp);
 298     for (i--; i >= 0; i--) {
 299         if (p[i])
 300             free(p[i]);
 301     }
 302     return (mname);
 303 }
 304
 305 /*
 306  * Return true if running ${.MAKE}
 307  * Bypassed if target is flagged .MAKE
 308  */
 309 static int
 310 is_submake(void *cmdp, void *gnp)
 311 {
 312     static char *p_make = NULL;
 313     static int p_len;
 314     char  *cmd = cmdp;
 315     GNode *gn = gnp;
 316     char *mp = NULL;
 317     char *cp;
 318     char *cp2;
 319     int rc = 0;                         /* keep looking */
 320
 321     if (!p_make) {
 322         p_make = Var_Value(".MAKE", gn, &cp);
 323         p_len = strlen(p_make);
 324     }
 325     cp = strchr(cmd, '$');
 326     if ((cp)) {
 327         mp = Var_Subst(NULL, cmd, gn, FALSE);
 328         cmd = mp;
 329     }
 330     cp2 = strstr(cmd, p_make);
 331     if ((cp2)) {
 332         switch (cp2[p_len]) {
 333         case '\0':
 334         case ' ':
 335         case '\t':
 336         case '\n':
 337             rc = 1;
 338             break;
 339         }
 340         if (cp2 > cmd && rc > 0) {
 341             switch (cp2[-1]) {
 342             case ' ':
 343             case '\t':
 344             case '\n':
 345                 break;
 346             default:
 347                 rc = 0;                 /* no match */
 348                 break;
 349             }
 350         }
 351     }
 352     if (mp)
 353         free(mp);
 354     return (rc);
 355 }
 356
 357 typedef struct meta_file_s {
 358     FILE *fp;
 359     GNode *gn;
 360 } meta_file_t;
 361
 362 static int
 363 printCMD(void *cmdp, void *mfpp)
 364 {
 365     meta_file_t *mfp = mfpp;
 366     char *cmd = cmdp;
 367     char *cp = NULL;
 368
 369     if (strchr(cmd, '$')) {
 370         cmd = cp = Var_Subst(NULL, cmd, mfp->gn, FALSE);
 371     }
 372     fprintf(mfp->fp, "CMD %s\n", cmd);
 373     if (cp)
 374         free(cp);
 375     return 0;
 376 }
 377
 378 /*
 379  * Certain node types never get a .meta file
 380  */
 381 #define SKIP_META_TYPE(_type) do { \
 382     if ((gn->type & __CONCAT(OP_, _type))) {    \
 383         if (DEBUG(META)) { \
 384             fprintf(debug_file, "Skipping meta for %s: .%s\n", \
 385                     gn->name, __STRING(_type));                \
 386         } \
 387         return (NULL); \
 388     } \
 389 } while (0)
 390
 391 static FILE *
 392 meta_create(BuildMon *pbm, GNode *gn)
 393 {
 394     meta_file_t mf;
 395     char buf[MAXPATHLEN];
 396     char objdir[MAXPATHLEN];
 397     char **ptr;
 398     const char *dname;
 399     const char *tname;
 400     char *fname;
 401     const char *cp;
 402     char *p[4];                         /* >= possible uses */
 403     int i;
 404     struct stat fs;
 405
 406
 407     /* This may be a phony node which we don't want meta data for... */
 408     /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */
 409     /* Or it may be explicitly flagged as .NOMETA */
 410     SKIP_META_TYPE(NOMETA);
 411     /* Unless it is explicitly flagged as .META */
 412     if (!(gn->type & OP_META)) {
 413         SKIP_META_TYPE(PHONY);
 414         SKIP_META_TYPE(SPECIAL);
 415         SKIP_META_TYPE(MAKE);
 416     }
 417
 418     mf.fp = NULL;
 419
 420     i = 0;
 421
 422     dname = Var_Value(".OBJDIR", gn, &p[i++]);
 423     tname = Var_Value(TARGET, gn, &p[i++]);
 424
 425     /* The object directory may not exist. Check it.. */
 426     if (stat(dname, &fs) != 0) {
 427         if (DEBUG(META))
 428             fprintf(debug_file, "Skipping meta for %s: no .OBJDIR\n",
 429                     gn->name);
 430         goto out;
 431     }
 432     /* Check if there are no commands to execute. */
 433     if (Lst_IsEmpty(gn->commands)) {
 434         if (DEBUG(META))
 435             fprintf(debug_file, "Skipping meta for %s: no commands\n",
 436                     gn->name);
 437         goto out;
 438     }
 439
 440     /* make sure these are canonical */
 441     if (realpath(dname, objdir))
 442         dname = objdir;
 443
 444     /* If we aren't in the object directory, don't create a meta file. */
 445     if (!metaCurdirOk && strcmp(curdir, dname) == 0) {
 446         if (DEBUG(META))
 447             fprintf(debug_file, "Skipping meta for %s: .OBJDIR == .CURDIR\n",
 448                     gn->name);
 449         goto out;
 450     }
 451     if (!(gn->type & OP_META)) {
 452         /* We do not generate .meta files for sub-makes */
 453         if (Lst_ForEach(gn->commands, is_submake, gn)) {
 454             if (DEBUG(META))
 455                 fprintf(debug_file, "Skipping meta for %s: .MAKE\n",
 456                         gn->name);
 457             goto out;
 458         }
 459     }
 460
 461     if (metaVerbose) {
 462         char *mp;
 463
 464         /* Describe the target we are building */
 465         mp = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", gn, 0);
 466         if (*mp)
 467             fprintf(stdout, "%s\n", mp);
 468         free(mp);
 469     }
 470     /* Get the basename of the target */
 471     if ((cp = strrchr(tname, '/')) == NULL) {
 472         cp = tname;
 473     } else {
 474         cp++;
 475     }
 476
 477     fflush(stdout);
 478
 479     if (strcmp(cp, makeDependfile) == 0)
 480         goto out;
 481
 482     if (!writeMeta)
 483         /* Don't create meta data. */
 484         goto out;
 485
 486     fname = meta_name(gn, pbm->meta_fname, sizeof(pbm->meta_fname),
 487                       dname, tname);
 488
 489 #ifdef DEBUG_META_MODE
 490     if (DEBUG(META))
 491         fprintf(debug_file, "meta_create: %s\n", fname);
 492 #endif
 493
 494     if ((mf.fp = fopen(fname, "w")) == NULL)
 495         err(1, "Could not open meta file '%s'", fname);
 496
 497     fprintf(mf.fp, "# Meta data file %s\n", fname);
 498
 499     mf.gn = gn;
 500
 501     Lst_ForEach(gn->commands, printCMD, &mf);
 502
 503     fprintf(mf.fp, "CWD %s\n", getcwd(buf, sizeof(buf)));
 504     fprintf(mf.fp, "TARGET %s\n", tname);
 505
 506     if (metaEnv) {
 507         for (ptr = environ; *ptr != NULL; ptr++)
 508             fprintf(mf.fp, "ENV %s\n", *ptr);
 509     }
 510
 511     fprintf(mf.fp, "-- command output --\n");
 512     fflush(mf.fp);
 513
 514     Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
 515     Var_Append(".MAKE.META.CREATED", fname, VAR_GLOBAL);
 516
 517     gn->type |= OP_META;                /* in case anyone wants to know */
 518     if (metaSilent) {
 519             gn->type |= OP_SILENT;
 520     }
 521  out:
 522     for (i--; i >= 0; i--) {
 523         if (p[i])
 524             free(p[i]);
 525     }
 526
 527     return (mf.fp);
 528 }
 529
 530 static Boolean
 531 boolValue(char *s)
 532 {
 533     switch(*s) {
 534     case '0':
 535     case 'N':
 536     case 'n':
 537     case 'F':
 538     case 'f':
 539         return FALSE;
 540     }
 541     return TRUE;
 542 }
 543
 544 /*
 545  * Initialization we need before reading makefiles.
 546  */
 547 void
 548 meta_init(void)
 549 {
 550 #ifdef USE_FILEMON
 551         /* this allows makefiles to test if we have filemon support */
 552         Var_Set(".MAKE.PATH_FILEMON", _PATH_FILEMON, VAR_GLOBAL, 0);
 553 #endif
 554 }
 555
 556
 557 /*
 558  * Initialization we need after reading makefiles.
 559  */
 560 void
 561 meta_mode_init(const char *make_mode)
 562 {
 563     static int once = 0;
 564     char *cp;
 565
 566     useMeta = TRUE;
 567     useFilemon = TRUE;
 568     writeMeta = TRUE;
 569
 570     if (make_mode) {
 571         if (strstr(make_mode, "env"))
 572             metaEnv = TRUE;
 573         if (strstr(make_mode, "verb"))
 574             metaVerbose = TRUE;
 575         if (strstr(make_mode, "read"))
 576             writeMeta = FALSE;
 577         if (strstr(make_mode, "nofilemon"))
 578             useFilemon = FALSE;
 579         if ((cp = strstr(make_mode, "curdirok="))) {
 580             metaCurdirOk = boolValue(&cp[9]);
 581         }
 582         if ((cp = strstr(make_mode, "silent="))) {
 583             metaSilent = boolValue(&cp[7]);
 584         }
 585         if (strstr(make_mode, "ignore-cmd"))
 586             metaIgnoreCMDs = TRUE;
 587         /* for backwards compatability */
 588         Var_Set(".MAKE.META_CREATED", "${.MAKE.META.CREATED}", VAR_GLOBAL, 0);
 589         Var_Set(".MAKE.META_FILES", "${.MAKE.META.FILES}", VAR_GLOBAL, 0);
 590     }
 591     if (metaVerbose && !Var_Exists(MAKE_META_PREFIX, VAR_GLOBAL)) {
 592         /*
 593          * The default value for MAKE_META_PREFIX
 594          * prints the absolute path of the target.
 595          * This works be cause :H will generate '.' if there is no /
 596          * and :tA will resolve that to cwd.
 597          */
 598         Var_Set(MAKE_META_PREFIX, "Building ${.TARGET:H:tA}/${.TARGET:T}", VAR_GLOBAL, 0);
 599     }
 600     if (once)
 601         return;
 602     once = 1;
 603     memset(&Mybm, 0, sizeof(Mybm));
 604     /*
 605      * We consider ourselves master of all within ${.MAKE.META.BAILIWICK}
 606      */
 607     metaBailiwick = Lst_Init(FALSE);
 608     cp = Var_Subst(NULL, "${.MAKE.META.BAILIWICK:O:u:tA}", VAR_GLOBAL, 0);
 609     if (cp) {
 610         str2Lst_Append(metaBailiwick, cp, NULL);
 611     }
 612     /*
 613      * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
 614      */
 615     metaIgnorePaths = Lst_Init(FALSE);
 616     Var_Append(MAKE_META_IGNORE_PATHS,
 617                "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}", VAR_GLOBAL);
 618     cp = Var_Subst(NULL,
 619                    "${" MAKE_META_IGNORE_PATHS ":O:u:tA}", VAR_GLOBAL, 0);
 620     if (cp) {
 621         str2Lst_Append(metaIgnorePaths, cp, NULL);
 622     }
 623 }
 624
 625 /*
 626  * In each case below we allow for job==NULL
 627  */
 628 void
 629 meta_job_start(Job *job, GNode *gn)
 630 {
 631     BuildMon *pbm;
 632
 633     if (job != NULL) {
 634         pbm = &job->bm;
 635     } else {
 636         pbm = &Mybm;
 637     }
 638     pbm->mfp = meta_create(pbm, gn);
 639 #ifdef USE_FILEMON_ONCE
 640     /* compat mode we open the filemon dev once per command */
 641     if (job == NULL)
 642         return;
 643 #endif
 644 #ifdef USE_FILEMON
 645     if (pbm->mfp != NULL && useFilemon) {
 646         filemon_open(pbm);
 647     } else {
 648         pbm->mon_fd = pbm->filemon_fd = -1;
 649     }
 650 #endif
 651 }
 652
 653 /*
 654  * The child calls this before doing anything.
 655  * It does not disturb our state.
 656  */
 657 void
 658 meta_job_child(Job *job)
 659 {
 660 #ifdef USE_FILEMON
 661     BuildMon *pbm;
 662
 663     if (job != NULL) {
 664         pbm = &job->bm;
 665     } else {
 666         pbm = &Mybm;
 667     }
 668     if (pbm->mfp != NULL) {
 669         close(fileno(pbm->mfp));
 670         if (useFilemon) {
 671             pid_t pid;
 672
 673             pid = getpid();
 674             if (ioctl(pbm->filemon_fd, FILEMON_SET_PID, &pid) < 0) {
 675                 err(1, "Could not set filemon pid!");
 676             }
 677         }
 678     }
 679 #endif
 680 }
 681
 682 void
 683 meta_job_error(Job *job, GNode *gn, int flags, int status)
 684 {
 685     char cwd[MAXPATHLEN];
 686     BuildMon *pbm;
 687
 688     if (job != NULL) {
 689         pbm = &job->bm;
 690     } else {
 691         if (!gn)
 692             gn = job->node;
 693         pbm = &Mybm;
 694     }
 695     if (pbm->mfp != NULL) {
 696         fprintf(pbm->mfp, "*** Error code %d%s\n",
 697                 status,
 698                 (flags & JOB_IGNERR) ?
 699                 "(ignored)" : "");
 700     }
 701     if (gn) {
 702         Var_Set(".ERROR_TARGET", gn->path ? gn->path : gn->name, VAR_GLOBAL, 0);
 703     }
 704     getcwd(cwd, sizeof(cwd));
 705     Var_Set(".ERROR_CWD", cwd, VAR_GLOBAL, 0);
 706     if (pbm && pbm->meta_fname[0]) {
 707         Var_Set(".ERROR_META_FILE", pbm->meta_fname, VAR_GLOBAL, 0);
 708     }
 709     meta_job_finish(job);
 710 }
 711
 712 void
 713 meta_job_output(Job *job, char *cp, const char *nl)
 714 {
 715     BuildMon *pbm;
 716
 717     if (job != NULL) {
 718         pbm = &job->bm;
 719     } else {
 720         pbm = &Mybm;
 721     }
 722     if (pbm->mfp != NULL) {
 723         if (metaVerbose) {
 724             static char *meta_prefix = NULL;
 725             static int meta_prefix_len;
 726
 727             if (!meta_prefix) {
 728                 char *cp2;
 729
 730                 meta_prefix = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", VAR_GLOBAL, 0);
 731                 if ((cp2 = strchr(meta_prefix, '$')))
 732                     meta_prefix_len = cp2 - meta_prefix;
 733                 else
 734                     meta_prefix_len = strlen(meta_prefix);
 735             }
 736             if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) {
 737                 cp = strchr(cp+1, '\n');
 738                 if (!cp++)
 739                     return;
 740             }
 741         }
 742         fprintf(pbm->mfp, "%s%s", cp, nl);
 743     }
 744 }
 745
 746 void
 747 meta_cmd_finish(void *pbmp)
 748 {
 749 #ifdef USE_FILEMON
 750     BuildMon *pbm = pbmp;
 751
 752     if (!pbm)
 753         pbm = &Mybm;
 754
 755     if (pbm->filemon_fd >= 0) {
 756         close(pbm->filemon_fd);
 757         filemon_read(pbm->mfp, pbm->mon_fd);
 758         pbm->filemon_fd = pbm->mon_fd = -1;
 759     }
 760 #endif
 761 }
 762
 763 void
 764 meta_job_finish(Job *job)
 765 {
 766     BuildMon *pbm;
 767
 768     if (job != NULL) {
 769         pbm = &job->bm;
 770     } else {
 771         pbm = &Mybm;
 772     }
 773     if (pbm->mfp != NULL) {
 774         meta_cmd_finish(pbm);
 775         fclose(pbm->mfp);
 776         pbm->mfp = NULL;
 777         pbm->meta_fname[0] = '\0';
 778     }
 779 }
 780
 781 /*
 782  * Fetch a full line from fp - growing bufp if needed
 783  * Return length in bufp.
 784  */
 785 static int
 786 fgetLine(char **bufp, size_t *szp, int o, FILE *fp)
 787 {
 788     char *buf = *bufp;
 789     size_t bufsz = *szp;
 790     struct stat fs;
 791     int x;
 792
 793     if (fgets(&buf[o], bufsz - o, fp) != NULL) {
 794     check_newline:
 795         x = o + strlen(&buf[o]);
 796         if (buf[x - 1] == '\n')
 797             return x;
 798         /*
 799          * We need to grow the buffer.
 800          * The meta file can give us a clue.
 801          */
 802         if (fstat(fileno(fp), &fs) == 0) {
 803             size_t newsz;
 804             char *p;
 805
 806             newsz = ROUNDUP((fs.st_size / 2), BUFSIZ);
 807             if (newsz <= bufsz)
 808                 newsz = ROUNDUP(fs.st_size, BUFSIZ);
 809             if (DEBUG(META))
 810                 fprintf(debug_file, "growing buffer %zu -> %zu\n",
 811                         bufsz, newsz);
 812             p = bmake_realloc(buf, newsz);
 813             if (p) {
 814                 *bufp = buf = p;
 815                 *szp = bufsz = newsz;
 816                 /* fetch the rest */
 817                 if (!fgets(&buf[x], bufsz - x, fp))
 818                     return x;           /* truncated! */
 819                 goto check_newline;
 820             }
 821         }
 822     }
 823     return 0;
 824 }
 825
 826 static int
 827 prefix_match(void *p, void *q)
 828 {
 829     const char *prefix = p;
 830     const char *path = q;
 831     size_t n = strlen(prefix);
 832
 833     return (0 == strncmp(path, prefix, n));
 834 }
 835
 836 static int
 837 string_match(const void *p, const void *q)
 838 {
 839     const char *p1 = p;
 840     const char *p2 = q;
 841
 842     return strcmp(p1, p2);
 843 }
 844
 845
 846 /*
 847  * When running with 'meta' functionality, a target can be out-of-date
 848  * if any of the references in its meta data file is more recent.
 849  * We have to track the latestdir on a per-process basis.
 850  */
 851 #define LCWD_VNAME_FMT ".meta.%d.lcwd"
 852 #define LDIR_VNAME_FMT ".meta.%d.ldir"
 853
 854 /*
 855  * It is possible that a .meta file is corrupted,
 856  * if we detect this we want to reproduce it.
 857  * Setting oodate TRUE will have that effect.
 858  */
 859 #define CHECK_VALID_META(p) if (!(p && *p)) { \
 860     warnx("%s: %d: malformed", fname, lineno); \
 861     oodate = TRUE; \
 862     continue; \
 863     }
 864
 865 #define DEQUOTE(p) if (*p == '\'') {    \
 866     char *ep; \
 867     p++; \
 868     if ((ep = strchr(p, '\''))) \
 869         *ep = '\0'; \
 870     }
 871
 872 Boolean
 873 meta_oodate(GNode *gn, Boolean oodate)
 874 {
 875     static char *tmpdir = NULL;
 876     static char cwd[MAXPATHLEN];
 877     char lcwd_vname[64];
 878     char ldir_vname[64];
 879     char lcwd[MAXPATHLEN];
 880     char latestdir[MAXPATHLEN];
 881     char fname[MAXPATHLEN];
 882     char fname1[MAXPATHLEN];
 883     char fname2[MAXPATHLEN];
 884     char fname3[MAXPATHLEN];
 885     char *p;
 886     char *cp;
 887     char *link_src;
 888     char *move_target;
 889     static size_t cwdlen = 0;
 890     static size_t tmplen = 0;
 891     FILE *fp;
 892     Boolean needOODATE = FALSE;
 893     Lst missingFiles;
 894
 895     if (oodate)
 896         return oodate;          /* we're done */
 897
 898     missingFiles = Lst_Init(FALSE);
 899
 900     /*
 901      * We need to check if the target is out-of-date. This includes
 902      * checking if the expanded command has changed. This in turn
 903      * requires that all variables are set in the same way that they
 904      * would be if the target needs to be re-built.
 905      */
 906     Make_DoAllVar(gn);
 907
 908     meta_name(gn, fname, sizeof(fname), NULL, NULL);
 909
 910 #ifdef DEBUG_META_MODE
 911     if (DEBUG(META))
 912         fprintf(debug_file, "meta_oodate: %s\n", fname);
 913 #endif
 914
 915     if ((fp = fopen(fname, "r")) != NULL) {
 916         static char *buf = NULL;
 917         static size_t bufsz;
 918         int lineno = 0;
 919         int lastpid = 0;
 920         int pid;
 921         int f = 0;
 922         int x;
 923         LstNode ln;
 924         struct stat fs;
 925
 926         if (!buf) {
 927             bufsz = 8 * BUFSIZ;
 928             buf = bmake_malloc(bufsz);
 929         }
 930
 931         if (!cwdlen) {
 932             if (getcwd(cwd, sizeof(cwd)) == NULL)
 933                 err(1, "Could not get current working directory");
 934             cwdlen = strlen(cwd);
 935         }
 936         strlcpy(lcwd, cwd, sizeof(lcwd));
 937         strlcpy(latestdir, cwd, sizeof(latestdir));
 938
 939         if (!tmpdir) {
 940             tmpdir = getTmpdir();
 941             tmplen = strlen(tmpdir);
 942         }
 943
 944         /* we want to track all the .meta we read */
 945         Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
 946
 947         ln = Lst_First(gn->commands);
 948         while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) {
 949             lineno++;
 950             if (buf[x - 1] == '\n')
 951                 buf[x - 1] = '\0';
 952             else {
 953                 warnx("%s: %d: line truncated at %u", fname, lineno, x);
 954                 oodate = TRUE;
 955                 break;
 956             }
 957             link_src = NULL;
 958             move_target = NULL;
 959             /* Find the start of the build monitor section. */
 960             if (!f) {
 961                 if (strncmp(buf, "-- filemon", 10) == 0) {
 962                     f = 1;
 963                     continue;
 964                 }
 965                 if (strncmp(buf, "# buildmon", 10) == 0) {
 966                     f = 1;
 967                     continue;
 968                 }
 969             }
 970
 971             /* Delimit the record type. */
 972             p = buf;
 973 #ifdef DEBUG_META_MODE
 974             if (DEBUG(META))
 975                 fprintf(debug_file, "%s: %d: %s\n", fname, lineno, buf);
 976 #endif
 977             strsep(&p, " ");
 978             if (f) {
 979                 /*
 980                  * We are in the 'filemon' output section.
 981                  * Each record from filemon follows the general form:
 982                  *
 983                  * <key> <pid> <data>
 984                  *
 985                  * Where:
 986                  * <key> is a single letter, denoting the syscall.
 987                  * <pid> is the process that made the syscall.
 988                  * <data> is the arguments (of interest).
 989                  */
 990                 switch(buf[0]) {
 991                 case '#':               /* comment */
 992                 case 'V':               /* version */
 993                     break;
 994                 default:
 995                     /*
 996                      * We need to track pathnames per-process.
 997                      *
 998                      * Each process run by make, starts off in the 'CWD'
 999                      * recorded in the .meta file, if it chdirs ('C')
1000                      * elsewhere we need to track that - but only for
1001                      * that process.  If it forks ('F'), we initialize
1002                      * the child to have the same cwd as its parent.
1003                      *
1004                      * We also need to track the 'latestdir' of
1005                      * interest.  This is usually the same as cwd, but
1006                      * not if a process is reading directories.
1007                      *
1008                      * Each time we spot a different process ('pid')
1009                      * we save the current value of 'latestdir' in a
1010                      * variable qualified by 'lastpid', and
1011                      * re-initialize 'latestdir' to any pre-saved
1012                      * value for the current 'pid' and 'CWD' if none.
1013                      */
1014                     CHECK_VALID_META(p);
1015                     pid = atoi(p);
1016                     if (pid > 0 && pid != lastpid) {
1017                         char *ldir;
1018                         char *tp;
1019
1020                         if (lastpid > 0) {
1021                             /* We need to remember these. */
1022                             Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0);
1023                             Var_Set(ldir_vname, latestdir, VAR_GLOBAL, 0);
1024                         }
1025                         snprintf(lcwd_vname, sizeof(lcwd_vname), LCWD_VNAME_FMT, pid);
1026                         snprintf(ldir_vname, sizeof(ldir_vname), LDIR_VNAME_FMT, pid);
1027                         lastpid = pid;
1028                         ldir = Var_Value(ldir_vname, VAR_GLOBAL, &tp);
1029                         if (ldir) {
1030                             strlcpy(latestdir, ldir, sizeof(latestdir));
1031                             if (tp)
1032                                 free(tp);
1033                         }
1034                         ldir = Var_Value(lcwd_vname, VAR_GLOBAL, &tp);
1035                         if (ldir) {
1036                             strlcpy(lcwd, ldir, sizeof(lcwd));
1037                             if (tp)
1038                                 free(tp);
1039                         }
1040                     }
1041                     /* Skip past the pid. */
1042                     if (strsep(&p, " ") == NULL)
1043                         continue;
1044 #ifdef DEBUG_META_MODE
1045                     if (DEBUG(META))
1046                             fprintf(debug_file, "%s: %d: %d: %c: cwd=%s lcwd=%s ldir=%s\n",
1047                                     fname, lineno,
1048                                     pid, buf[0], cwd, lcwd, latestdir);
1049 #endif
1050                     break;
1051                 }
1052
1053                 CHECK_VALID_META(p);
1054
1055                 /* Process according to record type. */
1056                 switch (buf[0]) {
1057                 case 'X':               /* eXit */
1058                     Var_Delete(lcwd_vname, VAR_GLOBAL);
1059                     Var_Delete(ldir_vname, VAR_GLOBAL);
1060                     lastpid = 0;        /* no need to save ldir_vname */
1061                     break;
1062
1063                 case 'F':               /* [v]Fork */
1064                     {
1065                         char cldir[64];
1066                         int child;
1067
1068                         child = atoi(p);
1069                         if (child > 0) {
1070                             snprintf(cldir, sizeof(cldir), LCWD_VNAME_FMT, child);
1071                             Var_Set(cldir, lcwd, VAR_GLOBAL, 0);
1072                             snprintf(cldir, sizeof(cldir), LDIR_VNAME_FMT, child);
1073                             Var_Set(cldir, latestdir, VAR_GLOBAL, 0);
1074 #ifdef DEBUG_META_MODE
1075                             if (DEBUG(META))
1076                                     fprintf(debug_file, "%s: %d: %d: cwd=%s lcwd=%s ldir=%s\n",
1077                                             fname, lineno,
1078                                             child, cwd, lcwd, latestdir);
1079 #endif
1080                         }
1081                     }
1082                     break;
1083
1084                 case 'C':               /* Chdir */
1085                     /* Update lcwd and latest directory. */
1086                     strlcpy(latestdir, p, sizeof(latestdir));
1087                     strlcpy(lcwd, p, sizeof(lcwd));
1088                     Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0);
1089                     Var_Set(ldir_vname, lcwd, VAR_GLOBAL, 0);
1090 #ifdef DEBUG_META_MODE
1091                     if (DEBUG(META))
1092                         fprintf(debug_file, "%s: %d: cwd=%s ldir=%s\n", fname, lineno, cwd, lcwd);
1093 #endif
1094                     break;
1095
1096                 case 'M':               /* renaMe */
1097                     /*
1098                      * For 'M'oves we want to check
1099                      * the src as for 'R'ead
1100                      * and the target as for 'W'rite.
1101                      */
1102                     cp = p;             /* save this for a second */
1103                     /* now get target */
1104                     if (strsep(&p, " ") == NULL)
1105                         continue;
1106                     CHECK_VALID_META(p);
1107                     move_target = p;
1108                     p = cp;
1109                     /* 'L' and 'M' put single quotes around the args */
1110                     DEQUOTE(p);
1111                     DEQUOTE(move_target);
1112                     /* FALLTHROUGH */
1113                 case 'D':               /* unlink */
1114                     if (*p == '/' && !Lst_IsEmpty(missingFiles)) {
1115                         /* remove p from the missingFiles list if present */
1116                         if ((ln = Lst_Find(missingFiles, p, string_match)) != NULL) {
1117                             char *tp = Lst_Datum(ln);
1118                             Lst_Remove(missingFiles, ln);
1119                             free(tp);
1120                             ln = NULL;  /* we're done with it */
1121                         }
1122                     }
1123                     if (buf[0] == 'M') {
1124                         /* the target of the mv is a file 'W'ritten */
1125 #ifdef DEBUG_META_MODE
1126                         if (DEBUG(META))
1127                             fprintf(debug_file, "meta_oodate: M %s -> %s\n",
1128                                     p, move_target);
1129 #endif
1130                         p = move_target;
1131                         goto check_write;
1132                     }
1133                     break;
1134                 case 'L':               /* Link */
1135                     /*
1136                      * For 'L'inks check
1137                      * the src as for 'R'ead
1138                      * and the target as for 'W'rite.
1139                      */
1140                     link_src = p;
1141                     /* now get target */
1142                     if (strsep(&p, " ") == NULL)
1143                         continue;
1144                     CHECK_VALID_META(p);
1145                     /* 'L' and 'M' put single quotes around the args */
1146                     DEQUOTE(p);
1147                     DEQUOTE(link_src);
1148 #ifdef DEBUG_META_MODE
1149                     if (DEBUG(META))
1150                         fprintf(debug_file, "meta_oodate: L %s -> %s\n",
1151                                 link_src, p);
1152 #endif
1153                     /* FALLTHROUGH */
1154                 case 'W':               /* Write */
1155                 check_write:
1156                     /*
1157                      * If a file we generated within our bailiwick
1158                      * but outside of .OBJDIR is missing,
1159                      * we need to do it again.
1160                      */
1161                     /* ignore non-absolute paths */
1162                     if (*p != '/')
1163                         break;
1164
1165                     if (Lst_IsEmpty(metaBailiwick))
1166                         break;
1167
1168                     /* ignore cwd - normal dependencies handle those */
1169                     if (strncmp(p, cwd, cwdlen) == 0)
1170                         break;
1171
1172                     if (!Lst_ForEach(metaBailiwick, prefix_match, p))
1173                         break;
1174
1175                     /* tmpdir might be within */
1176                     if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0)
1177                         break;
1178
1179                     /* ignore anything containing the string "tmp" */
1180                     if ((strstr("tmp", p)))
1181                         break;
1182
1183                     if (stat(p, &fs) < 0) {
1184                         Lst_AtEnd(missingFiles, bmake_strdup(p));
1185                     }
1186                     break;
1187                 check_link_src:
1188                     p = link_src;
1189                     link_src = NULL;
1190 #ifdef DEBUG_META_MODE
1191                     if (DEBUG(META))
1192                         fprintf(debug_file, "meta_oodate: L src %s\n", p);
1193 #endif
1194                     /* FALLTHROUGH */
1195                 case 'R':               /* Read */
1196                 case 'E':               /* Exec */
1197                     /*
1198                      * Check for runtime files that can't
1199                      * be part of the dependencies because
1200                      * they are _expected_ to change.
1201                      */
1202                     if (*p == '/' &&
1203                         Lst_ForEach(metaIgnorePaths, prefix_match, p)) {
1204 #ifdef DEBUG_META_MODE
1205                         if (DEBUG(META))
1206                             fprintf(debug_file, "meta_oodate: ignoring: %s\n",
1207                                     p);
1208 #endif
1209                         break;
1210                     }
1211
1212                     /*
1213                      * The rest of the record is the file name.
1214                      * Check if it's not an absolute path.
1215                      */
1216                     {
1217                         char *sdirs[4];
1218                         char **sdp;
1219                         int sdx = 0;
1220                         int found = 0;
1221
1222                         if (*p == '/') {
1223                             sdirs[sdx++] = p; /* done */
1224                         } else {
1225                             if (strcmp(".", p) == 0)
1226                                 continue;  /* no point */
1227
1228                             /* Check vs latestdir */
1229                             snprintf(fname1, sizeof(fname1), "%s/%s", latestdir, p);
1230                             sdirs[sdx++] = fname1;
1231
1232                             if (strcmp(latestdir, lcwd) != 0) {
1233                                 /* Check vs lcwd */
1234                                 snprintf(fname2, sizeof(fname2), "%s/%s", lcwd, p);
1235                                 sdirs[sdx++] = fname2;
1236                             }
1237                             if (strcmp(lcwd, cwd) != 0) {
1238                                 /* Check vs cwd */
1239                                 snprintf(fname3, sizeof(fname3), "%s/%s", cwd, p);
1240                                 sdirs[sdx++] = fname3;
1241                             }
1242                         }
1243                         sdirs[sdx++] = NULL;
1244
1245                         for (sdp = sdirs; *sdp && !found; sdp++) {
1246 #ifdef DEBUG_META_MODE
1247                             if (DEBUG(META))
1248                                 fprintf(debug_file, "%s: %d: looking for: %s\n", fname, lineno, *sdp);
1249 #endif
1250                             if (stat(*sdp, &fs) == 0) {
1251                                 found = 1;
1252                                 p = *sdp;
1253                             }
1254                         }
1255                         if (found) {
1256 #ifdef DEBUG_META_MODE
1257                             if (DEBUG(META))
1258                                 fprintf(debug_file, "%s: %d: found: %s\n", fname, lineno, p);
1259 #endif
1260                             if (!S_ISDIR(fs.st_mode) &&
1261                                 fs.st_mtime > gn->mtime) {
1262                                 if (DEBUG(META))
1263                                     fprintf(debug_file, "%s: %d: file '%s' is newer than the target...\n", fname, lineno, p);
1264                                 oodate = TRUE;
1265                             } else if (S_ISDIR(fs.st_mode)) {
1266                                 /* Update the latest directory. */
1267                                 realpath(p, latestdir);
1268                             }
1269                         } else if (errno == ENOENT && *p == '/' &&
1270                                    strncmp(p, cwd, cwdlen) != 0) {
1271                             /*
1272                              * A referenced file outside of CWD is missing.
1273                              * We cannot catch every eventuality here...
1274                              */
1275                             if (DEBUG(META))
1276                                 fprintf(debug_file, "%s: %d: file '%s' may have moved?...\n", fname, lineno, p);
1277                             oodate = TRUE;
1278                         }
1279                     }
1280                     if (buf[0] == 'E') {
1281                         /* previous latestdir is no longer relevant */
1282                         strlcpy(latestdir, lcwd, sizeof(latestdir));
1283                     }
1284                     break;
1285                 default:
1286                     break;
1287                 }
1288                 if (!oodate && buf[0] == 'L' && link_src != NULL)
1289                     goto check_link_src;
1290             } else if (strcmp(buf, "CMD") == 0) {
1291                 /*
1292                  * Compare the current command with the one in the
1293                  * meta data file.
1294                  */
1295                 if (ln == NULL) {
1296                     if (DEBUG(META))
1297                         fprintf(debug_file, "%s: %d: there were more build commands in the meta data file than there are now...\n", fname, lineno);
1298                     oodate = TRUE;
1299                 } else {
1300                     char *cmd = (char *)Lst_Datum(ln);
1301                     Boolean hasOODATE = FALSE;
1302
1303                     if (strstr(cmd, "$?"))
1304                         hasOODATE = TRUE;
1305                     else if ((cp = strstr(cmd, ".OODATE"))) {
1306                         /* check for $[{(].OODATE[:)}] */
1307                         if (cp > cmd + 2 && cp[-2] == '$')
1308                             hasOODATE = TRUE;
1309                     }
1310                     if (hasOODATE) {
1311                         needOODATE = TRUE;
1312                         if (DEBUG(META))
1313                             fprintf(debug_file, "%s: %d: cannot compare command using .OODATE\n", fname, lineno);
1314                     }
1315                     cmd = Var_Subst(NULL, cmd, gn, TRUE);
1316
1317                     if ((cp = strchr(cmd, '\n'))) {
1318                         int n;
1319
1320                         /*
1321                          * This command contains newlines, we need to
1322                          * fetch more from the .meta file before we
1323                          * attempt a comparison.
1324                          */
1325                         /* first put the newline back at buf[x - 1] */
1326                         buf[x - 1] = '\n';
1327                         do {
1328                             /* now fetch the next line */
1329                             if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0)
1330                                 break;
1331                             x = n;
1332                             lineno++;
1333                             if (buf[x - 1] != '\n') {
1334                                 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1335                                 break;
1336                             }
1337                             cp = strchr(++cp, '\n');
1338                         } while (cp);
1339                         if (buf[x - 1] == '\n')
1340                             buf[x - 1] = '\0';
1341                     }
1342                     if (!hasOODATE &&
1343                         !(gn->type & OP_NOMETA_CMP) &&
1344                         strcmp(p, cmd) != 0) {
1345                         if (DEBUG(META))
1346                             fprintf(debug_file, "%s: %d: a build command has changed\n%s\nvs\n%s\n", fname, lineno, p, cmd);
1347                         if (!metaIgnoreCMDs)
1348                             oodate = TRUE;
1349                     }
1350                     free(cmd);
1351                     ln = Lst_Succ(ln);
1352                 }
1353             } else if (strcmp(buf, "CWD") == 0) {
1354                 /*
1355                  * Check if there are extra commands now
1356                  * that weren't in the meta data file.
1357                  */
1358                 if (!oodate && ln != NULL) {
1359                     if (DEBUG(META))
1360                         fprintf(debug_file, "%s: %d: there are extra build commands now that weren't in the meta data file\n", fname, lineno);
1361                     oodate = TRUE;
1362                 }
1363                 if (strcmp(p, cwd) != 0) {
1364                     if (DEBUG(META))
1365                         fprintf(debug_file, "%s: %d: the current working directory has changed from '%s' to '%s'\n", fname, lineno, p, curdir);
1366                     oodate = TRUE;
1367                 }
1368             }
1369         }
1370
1371         fclose(fp);
1372         if (!Lst_IsEmpty(missingFiles)) {
1373             if (DEBUG(META))
1374                 fprintf(debug_file, "%s: missing files: %s...\n",
1375                         fname, (char *)Lst_Datum(Lst_First(missingFiles)));
1376             oodate = TRUE;
1377             Lst_Destroy(missingFiles, (FreeProc *)free);
1378         }
1379     } else {
1380         if ((gn->type & OP_META)) {
1381             if (DEBUG(META))
1382                 fprintf(debug_file, "%s: required but missing\n", fname);
1383             oodate = TRUE;
1384         }
1385     }
1386     if (oodate && needOODATE) {
1387         /*
1388          * Target uses .OODATE which is empty; or we wouldn't be here.
1389          * We have decided it is oodate, so .OODATE needs to be set.
1390          * All we can sanely do is set it to .ALLSRC.
1391          */
1392         Var_Delete(OODATE, gn);
1393         Var_Set(OODATE, Var_Value(ALLSRC, gn, &cp), gn, 0);
1394         if (cp)
1395             free(cp);
1396     }
1397     return oodate;
1398 }
1399
1400 /* support for compat mode */
1401
1402 static int childPipe[2];
1403
1404 void
1405 meta_compat_start(void)
1406 {
1407 #ifdef USE_FILEMON_ONCE
1408     /*
1409      * We need to re-open filemon for each cmd.
1410      */
1411     BuildMon *pbm = &Mybm;
1412
1413     if (pbm->mfp != NULL && useFilemon) {
1414         filemon_open(pbm);
1415     } else {
1416         pbm->mon_fd = pbm->filemon_fd = -1;
1417     }
1418 #endif
1419     if (pipe(childPipe) < 0)
1420         Punt("Cannot create pipe: %s", strerror(errno));
1421     /* Set close-on-exec flag for both */
1422     (void)fcntl(childPipe[0], F_SETFD, 1);
1423     (void)fcntl(childPipe[1], F_SETFD, 1);
1424 }
1425
1426 void
1427 meta_compat_child(void)
1428 {
1429     meta_job_child(NULL);
1430     if (dup2(childPipe[1], 1) < 0 ||
1431         dup2(1, 2) < 0) {
1432         execError("dup2", "pipe");
1433         _exit(1);
1434     }
1435 }
1436
1437 void
1438 meta_compat_parent(void)
1439 {
1440     FILE *fp;
1441     char buf[BUFSIZ];
1442
1443     close(childPipe[1]);                        /* child side */
1444     fp = fdopen(childPipe[0], "r");
1445     while (fgets(buf, sizeof(buf), fp)) {
1446         meta_job_output(NULL, buf, "");
1447         printf("%s", buf);
1448     }
1449     fclose(fp);
1450 }
1451
1452 #endif  /* USE_META */