1 /* $NetBSD: meta.c,v 1.69 2017/08/10 21:07:48 sjg Exp $ */
4 * Implement 'meta' mode.
5 * Adapted from John Birrell's patches to FreeBSD make.
9 * Copyright (c) 2009-2016, Juniper Networks, Inc.
10 * Portions Copyright (c) 2009, John Birrell.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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.
39 #include <sys/ioctl.h>
42 #elif !defined(HAVE_DIRNAME)
43 char * dirname(char *);
46 #if !defined(HAVE_CONFIG_H) || defined(HAVE_ERR_H)
56 #if !defined(USE_FILEMON) && defined(FILEMON_SET_FD)
60 static BuildMon Mybm; /* for compat */
61 static Lst metaBailiwick; /* our scope of control */
62 static char *metaBailiwickStr; /* string storage for the list */
63 static Lst metaIgnorePaths; /* paths we deliberately ignore */
64 static char *metaIgnorePathsStr; /* string storage for the list */
66 #ifndef MAKE_META_IGNORE_PATHS
67 #define MAKE_META_IGNORE_PATHS ".MAKE.META.IGNORE_PATHS"
69 #ifndef MAKE_META_IGNORE_PATTERNS
70 #define MAKE_META_IGNORE_PATTERNS ".MAKE.META.IGNORE_PATTERNS"
72 #ifndef MAKE_META_IGNORE_FILTER
73 #define MAKE_META_IGNORE_FILTER ".MAKE.META.IGNORE_FILTER"
76 Boolean useMeta = FALSE;
77 static Boolean useFilemon = FALSE;
78 static Boolean writeMeta = FALSE;
79 static Boolean metaMissing = FALSE; /* oodate if missing */
80 static Boolean filemonMissing = FALSE; /* oodate if missing */
81 static Boolean metaEnv = FALSE; /* don't save env unless asked */
82 static Boolean metaVerbose = FALSE;
83 static Boolean metaIgnoreCMDs = FALSE; /* ignore CMDs in .meta files */
84 static Boolean metaIgnorePatterns = FALSE; /* do we need to do pattern matches */
85 static Boolean metaIgnoreFilter = FALSE; /* do we have more complex filtering? */
86 static Boolean metaCurdirOk = FALSE; /* write .meta in .CURDIR Ok? */
87 static Boolean metaSilent = FALSE; /* if we have a .meta be SILENT */
89 extern Boolean forceJobs;
90 extern Boolean comatMake;
91 extern char **environ;
93 #define MAKE_META_PREFIX ".MAKE.META.PREFIX"
96 # define N2U(n, u) (((n) + ((u) - 1)) / (u))
99 # define ROUNDUP(n, u) (N2U((n), (u)) * (u))
102 #if !defined(HAVE_STRSEP)
103 # define strsep(s, d) stresep((s), (d), 0)
107 * Filemon is a kernel module which snoops certain syscalls.
118 * See meta_oodate below - we mainly care about 'E' and 'R'.
120 * We can still use meta mode without filemon, but
121 * the benefits are more limited.
124 # ifndef _PATH_FILEMON
125 # define _PATH_FILEMON "/dev/filemon"
129 * Open the filemon device.
132 filemon_open(BuildMon *pbm)
136 pbm->mon_fd = pbm->filemon_fd = -1;
140 for (retry = 5; retry >= 0; retry--) {
141 if ((pbm->filemon_fd = open(_PATH_FILEMON, O_RDWR)) >= 0)
145 if (pbm->filemon_fd < 0) {
147 warn("Could not open %s", _PATH_FILEMON);
152 * We use a file outside of '.'
153 * to avoid a FreeBSD kernel bug where unlink invalidates
154 * cwd causing getcwd to do a lot more work.
155 * We only care about the descriptor.
157 pbm->mon_fd = mkTempFile("filemon.XXXXXX", NULL);
158 if (ioctl(pbm->filemon_fd, FILEMON_SET_FD, &pbm->mon_fd) < 0) {
159 err(1, "Could not set filemon file descriptor!");
161 /* we don't need these once we exec */
162 (void)fcntl(pbm->mon_fd, F_SETFD, FD_CLOEXEC);
163 (void)fcntl(pbm->filemon_fd, F_SETFD, FD_CLOEXEC);
167 * Read the build monitor output file and write records to the target's
171 filemon_read(FILE *mfp, int fd)
177 /* Check if we're not writing to a meta data file.*/
180 close(fd); /* not interested */
184 (void)lseek(fd, (off_t)0, SEEK_SET);
187 fprintf(mfp, "\n-- filemon acquired metadata --\n");
189 while ((n = read(fd, buf, sizeof(buf))) > 0) {
190 if ((int)fwrite(buf, 1, n, mfp) < n)
201 * when realpath() fails,
202 * we use this, to clean up ./ and ../
205 eat_dots(char *buf, size_t bufsz, int dots)
226 cp = strstr(buf, eat);
229 if (dots == 2 && cp > buf) {
232 } while (cp > buf && *cp != '/');
235 strlcpy(cp, cp2, bufsz - (cp - buf));
237 return; /* can't happen? */
244 meta_name(char *mname, size_t mnamelen,
249 char buf[MAXPATHLEN];
257 * Weed out relative paths from the target file name.
258 * We have to be careful though since if target is a
259 * symlink, the result will be unstable.
260 * So we use realpath() just to get the dirname, and leave the
261 * basename as given to us.
263 if ((cp = strrchr(tname, '/'))) {
264 if (cached_realpath(tname, buf)) {
265 if ((rp = strrchr(buf, '/'))) {
268 if (strcmp(cp, rp) != 0)
269 strlcpy(rp, cp, sizeof(buf) - (rp - buf));
274 * We likely have a directory which is about to be made.
275 * We pretend realpath() succeeded, to have a chance
276 * of generating the same meta file name that we will
279 if (tname[0] == '/') {
280 strlcpy(buf, tname, sizeof(buf));
282 snprintf(buf, sizeof(buf), "%s/%s", cwd, tname);
284 eat_dots(buf, sizeof(buf), 1); /* ./ */
285 eat_dots(buf, sizeof(buf), 2); /* ../ */
289 /* on some systems dirname may modify its arg */
290 tp = bmake_strdup(tname);
292 if (strcmp(dname, dtp) == 0)
293 snprintf(mname, mnamelen, "%s.meta", tname);
295 ldname = strlen(dname);
296 if (strncmp(dname, dtp, ldname) == 0 && dtp[ldname] == '/')
297 snprintf(mname, mnamelen, "%s/%s.meta", dname, &tname[ldname+1]);
299 snprintf(mname, mnamelen, "%s/%s.meta", dname, tname);
302 * Replace path separators in the file name after the
303 * current object directory path.
305 cp = mname + strlen(dname) + 1;
307 while (*cp != '\0') {
318 * Return true if running ${.MAKE}
319 * Bypassed if target is flagged .MAKE
322 is_submake(void *cmdp, void *gnp)
324 static char *p_make = NULL;
331 int rc = 0; /* keep looking */
334 p_make = Var_Value(".MAKE", gn, &cp);
335 p_len = strlen(p_make);
337 cp = strchr(cmd, '$');
339 mp = Var_Subst(NULL, cmd, gn, VARF_WANTRES);
342 cp2 = strstr(cmd, p_make);
344 switch (cp2[p_len]) {
352 if (cp2 > cmd && rc > 0) {
359 rc = 0; /* no match */
368 typedef struct meta_file_s {
374 printCMD(void *cmdp, void *mfpp)
376 meta_file_t *mfp = mfpp;
380 if (strchr(cmd, '$')) {
381 cmd = cp = Var_Subst(NULL, cmd, mfp->gn, VARF_WANTRES);
383 fprintf(mfp->fp, "CMD %s\n", cmd);
389 * Certain node types never get a .meta file
391 #define SKIP_META_TYPE(_type) do { \
392 if ((gn->type & __CONCAT(OP_, _type))) { \
394 fprintf(debug_file, "Skipping meta for %s: .%s\n", \
395 gn->name, __STRING(_type)); \
403 * Do we need/want a .meta file ?
406 meta_needed(GNode *gn, const char *dname,
407 char *objdir, int verbose)
412 verbose = DEBUG(META);
414 /* This may be a phony node which we don't want meta data for... */
415 /* Skip .meta for .BEGIN, .END, .ERROR etc as well. */
416 /* Or it may be explicitly flagged as .NOMETA */
417 SKIP_META_TYPE(NOMETA);
418 /* Unless it is explicitly flagged as .META */
419 if (!(gn->type & OP_META)) {
420 SKIP_META_TYPE(PHONY);
421 SKIP_META_TYPE(SPECIAL);
422 SKIP_META_TYPE(MAKE);
425 /* Check if there are no commands to execute. */
426 if (Lst_IsEmpty(gn->commands)) {
428 fprintf(debug_file, "Skipping meta for %s: no commands\n",
432 if ((gn->type & (OP_META|OP_SUBMAKE)) == OP_SUBMAKE) {
433 /* OP_SUBMAKE is a bit too aggressive */
434 if (Lst_ForEach(gn->commands, is_submake, gn)) {
436 fprintf(debug_file, "Skipping meta for %s: .SUBMAKE\n",
442 /* The object directory may not exist. Check it.. */
443 if (cached_stat(dname, &fs) != 0) {
445 fprintf(debug_file, "Skipping meta for %s: no .OBJDIR\n",
450 /* make sure these are canonical */
451 if (cached_realpath(dname, objdir))
454 /* If we aren't in the object directory, don't create a meta file. */
455 if (!metaCurdirOk && strcmp(curdir, dname) == 0) {
457 fprintf(debug_file, "Skipping meta for %s: .OBJDIR == .CURDIR\n",
466 meta_create(BuildMon *pbm, GNode *gn)
469 char buf[MAXPATHLEN];
470 char objdir[MAXPATHLEN];
476 char *p[4]; /* >= possible uses */
482 dname = Var_Value(".OBJDIR", gn, &p[i++]);
483 tname = Var_Value(TARGET, gn, &p[i++]);
485 /* if this succeeds objdir is realpath of dname */
486 if (!meta_needed(gn, dname, objdir, TRUE))
493 /* Describe the target we are building */
494 mp = Var_Subst(NULL, "${" MAKE_META_PREFIX "}", gn, VARF_WANTRES);
496 fprintf(stdout, "%s\n", mp);
499 /* Get the basename of the target */
500 if ((cp = strrchr(tname, '/')) == NULL) {
509 /* Don't create meta data. */
512 fname = meta_name(pbm->meta_fname, sizeof(pbm->meta_fname),
513 dname, tname, objdir);
515 #ifdef DEBUG_META_MODE
517 fprintf(debug_file, "meta_create: %s\n", fname);
520 if ((mf.fp = fopen(fname, "w")) == NULL)
521 err(1, "Could not open meta file '%s'", fname);
523 fprintf(mf.fp, "# Meta data file %s\n", fname);
527 Lst_ForEach(gn->commands, printCMD, &mf);
529 fprintf(mf.fp, "CWD %s\n", getcwd(buf, sizeof(buf)));
530 fprintf(mf.fp, "TARGET %s\n", tname);
533 for (ptr = environ; *ptr != NULL; ptr++)
534 fprintf(mf.fp, "ENV %s\n", *ptr);
537 fprintf(mf.fp, "-- command output --\n");
540 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
541 Var_Append(".MAKE.META.CREATED", fname, VAR_GLOBAL);
543 gn->type |= OP_META; /* in case anyone wants to know */
545 gn->type |= OP_SILENT;
548 for (i--; i >= 0; i--) {
570 * Initialization we need before reading makefiles.
576 /* this allows makefiles to test if we have filemon support */
577 Var_Set(".MAKE.PATH_FILEMON", _PATH_FILEMON, VAR_GLOBAL, 0);
582 #define get_mode_bf(bf, token) \
583 if ((cp = strstr(make_mode, token))) \
584 bf = boolValue(&cp[sizeof(token) - 1])
587 * Initialization we need after reading makefiles.
590 meta_mode_init(const char *make_mode)
600 if (strstr(make_mode, "env"))
602 if (strstr(make_mode, "verb"))
604 if (strstr(make_mode, "read"))
606 if (strstr(make_mode, "nofilemon"))
608 if (strstr(make_mode, "ignore-cmd"))
609 metaIgnoreCMDs = TRUE;
611 get_mode_bf(filemonMissing, "missing-filemon=");
612 get_mode_bf(metaCurdirOk, "curdirok=");
613 get_mode_bf(metaMissing, "missing-meta=");
614 get_mode_bf(metaSilent, "silent=");
616 if (metaVerbose && !Var_Exists(MAKE_META_PREFIX, VAR_GLOBAL)) {
618 * The default value for MAKE_META_PREFIX
619 * prints the absolute path of the target.
620 * This works be cause :H will generate '.' if there is no /
621 * and :tA will resolve that to cwd.
623 Var_Set(MAKE_META_PREFIX, "Building ${.TARGET:H:tA}/${.TARGET:T}", VAR_GLOBAL, 0);
628 memset(&Mybm, 0, sizeof(Mybm));
630 * We consider ourselves master of all within ${.MAKE.META.BAILIWICK}
632 metaBailiwick = Lst_Init(FALSE);
633 metaBailiwickStr = Var_Subst(NULL, "${.MAKE.META.BAILIWICK:O:u:tA}",
634 VAR_GLOBAL, VARF_WANTRES);
635 if (metaBailiwickStr) {
636 str2Lst_Append(metaBailiwick, metaBailiwickStr, NULL);
639 * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
641 metaIgnorePaths = Lst_Init(FALSE);
642 Var_Append(MAKE_META_IGNORE_PATHS,
643 "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}", VAR_GLOBAL);
644 metaIgnorePathsStr = Var_Subst(NULL,
645 "${" MAKE_META_IGNORE_PATHS ":O:u:tA}", VAR_GLOBAL,
647 if (metaIgnorePathsStr) {
648 str2Lst_Append(metaIgnorePaths, metaIgnorePathsStr, NULL);
652 * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS}
655 if (Var_Value(MAKE_META_IGNORE_PATTERNS, VAR_GLOBAL, &cp)) {
656 metaIgnorePatterns = TRUE;
660 if (Var_Value(MAKE_META_IGNORE_FILTER, VAR_GLOBAL, &cp)) {
661 metaIgnoreFilter = TRUE;
667 * In each case below we allow for job==NULL
670 meta_job_start(Job *job, GNode *gn)
679 pbm->mfp = meta_create(pbm, gn);
680 #ifdef USE_FILEMON_ONCE
681 /* compat mode we open the filemon dev once per command */
686 if (pbm->mfp != NULL && useFilemon) {
689 pbm->mon_fd = pbm->filemon_fd = -1;
695 * The child calls this before doing anything.
696 * It does not disturb our state.
699 meta_job_child(Job *job)
709 if (pbm->mfp != NULL) {
710 close(fileno(pbm->mfp));
715 if (ioctl(pbm->filemon_fd, FILEMON_SET_PID, &pid) < 0) {
716 err(1, "Could not set filemon pid!");
724 meta_job_error(Job *job, GNode *gn, int flags, int status)
726 char cwd[MAXPATHLEN];
736 if (pbm->mfp != NULL) {
737 fprintf(pbm->mfp, "\n*** Error code %d%s\n",
739 (flags & JOB_IGNERR) ?
743 Var_Set(".ERROR_TARGET", gn->path ? gn->path : gn->name, VAR_GLOBAL, 0);
745 getcwd(cwd, sizeof(cwd));
746 Var_Set(".ERROR_CWD", cwd, VAR_GLOBAL, 0);
747 if (pbm->meta_fname[0]) {
748 Var_Set(".ERROR_META_FILE", pbm->meta_fname, VAR_GLOBAL, 0);
750 meta_job_finish(job);
754 meta_job_output(Job *job, char *cp, const char *nl)
763 if (pbm->mfp != NULL) {
765 static char *meta_prefix = NULL;
766 static int meta_prefix_len;
771 meta_prefix = Var_Subst(NULL, "${" MAKE_META_PREFIX "}",
772 VAR_GLOBAL, VARF_WANTRES);
773 if ((cp2 = strchr(meta_prefix, '$')))
774 meta_prefix_len = cp2 - meta_prefix;
776 meta_prefix_len = strlen(meta_prefix);
778 if (strncmp(cp, meta_prefix, meta_prefix_len) == 0) {
779 cp = strchr(cp+1, '\n');
784 fprintf(pbm->mfp, "%s%s", cp, nl);
789 meta_cmd_finish(void *pbmp)
792 BuildMon *pbm = pbmp;
799 if (pbm->filemon_fd >= 0) {
800 if (close(pbm->filemon_fd) < 0)
802 x = filemon_read(pbm->mfp, pbm->mon_fd);
803 if (error == 0 && x != 0)
805 pbm->filemon_fd = pbm->mon_fd = -1;
808 fprintf(pbm->mfp, "\n"); /* ensure end with newline */
813 meta_job_finish(Job *job)
824 if (pbm->mfp != NULL) {
825 error = meta_cmd_finish(pbm);
826 x = fclose(pbm->mfp);
827 if (error == 0 && x != 0)
830 pbm->meta_fname[0] = '\0';
838 Lst_Destroy(metaBailiwick, NULL);
839 free(metaBailiwickStr);
840 Lst_Destroy(metaIgnorePaths, NULL);
841 free(metaIgnorePathsStr);
845 * Fetch a full line from fp - growing bufp if needed
846 * Return length in bufp.
849 fgetLine(char **bufp, size_t *szp, int o, FILE *fp)
856 if (fgets(&buf[o], bufsz - o, fp) != NULL) {
858 x = o + strlen(&buf[o]);
859 if (buf[x - 1] == '\n')
862 * We need to grow the buffer.
863 * The meta file can give us a clue.
865 if (fstat(fileno(fp), &fs) == 0) {
869 newsz = ROUNDUP((fs.st_size / 2), BUFSIZ);
871 newsz = ROUNDUP(fs.st_size, BUFSIZ);
873 return x; /* truncated */
875 fprintf(debug_file, "growing buffer %u -> %u\n",
876 (unsigned)bufsz, (unsigned)newsz);
877 p = bmake_realloc(buf, newsz);
880 *szp = bufsz = newsz;
882 if (!fgets(&buf[x], bufsz - x, fp))
883 return x; /* truncated! */
891 /* Lst_ForEach wants 1 to stop search */
893 prefix_match(void *p, void *q)
895 const char *prefix = p;
896 const char *path = q;
897 size_t n = strlen(prefix);
899 return (0 == strncmp(path, prefix, n));
903 * looking for exact or prefix/ match to
904 * Lst_Find wants 0 to stop search
907 path_match(const void *p, const void *q)
909 const char *prefix = q;
910 const char *path = p;
911 size_t n = strlen(prefix);
914 if ((rc = strncmp(path, prefix, n)) == 0) {
927 /* Lst_Find wants 0 to stop search */
929 string_match(const void *p, const void *q)
934 return strcmp(p1, p2);
939 meta_ignore(GNode *gn, const char *p)
941 char fname[MAXPATHLEN];
947 cached_realpath(p, fname); /* clean it up */
948 if (Lst_ForEach(metaIgnorePaths, prefix_match, fname)) {
949 #ifdef DEBUG_META_MODE
951 fprintf(debug_file, "meta_oodate: ignoring path: %s\n",
958 if (metaIgnorePatterns) {
961 Var_Set(".p.", p, gn, 0);
963 "${" MAKE_META_IGNORE_PATTERNS ":@m@${.p.:M$m}@}",
966 #ifdef DEBUG_META_MODE
968 fprintf(debug_file, "meta_oodate: ignoring pattern: %s\n",
977 if (metaIgnoreFilter) {
980 /* skip if filter result is empty */
981 snprintf(fname, sizeof(fname),
983 p, MAKE_META_IGNORE_FILTER);
984 fm = Var_Subst(NULL, fname, gn, VARF_WANTRES);
986 #ifdef DEBUG_META_MODE
988 fprintf(debug_file, "meta_oodate: ignoring filtered: %s\n",
1000 * When running with 'meta' functionality, a target can be out-of-date
1001 * if any of the references in its meta data file is more recent.
1002 * We have to track the latestdir on a per-process basis.
1004 #define LCWD_VNAME_FMT ".meta.%d.lcwd"
1005 #define LDIR_VNAME_FMT ".meta.%d.ldir"
1008 * It is possible that a .meta file is corrupted,
1009 * if we detect this we want to reproduce it.
1010 * Setting oodate TRUE will have that effect.
1012 #define CHECK_VALID_META(p) if (!(p && *p)) { \
1013 warnx("%s: %d: malformed", fname, lineno); \
1018 #define DEQUOTE(p) if (*p == '\'') { \
1021 if ((ep = strchr(p, '\''))) \
1026 meta_oodate(GNode *gn, Boolean oodate)
1028 static char *tmpdir = NULL;
1029 static char cwd[MAXPATHLEN];
1030 char lcwd_vname[64];
1031 char ldir_vname[64];
1032 char lcwd[MAXPATHLEN];
1033 char latestdir[MAXPATHLEN];
1034 char fname[MAXPATHLEN];
1035 char fname1[MAXPATHLEN];
1036 char fname2[MAXPATHLEN];
1037 char fname3[MAXPATHLEN];
1044 static size_t cwdlen = 0;
1045 static size_t tmplen = 0;
1047 Boolean needOODATE = FALSE;
1049 char *pa[4]; /* >= possible uses */
1051 int have_filemon = FALSE;
1054 return oodate; /* we're done */
1058 dname = Var_Value(".OBJDIR", gn, &pa[i++]);
1059 tname = Var_Value(TARGET, gn, &pa[i++]);
1061 /* if this succeeds fname3 is realpath of dname */
1062 if (!meta_needed(gn, dname, fname3, FALSE))
1066 missingFiles = Lst_Init(FALSE);
1069 * We need to check if the target is out-of-date. This includes
1070 * checking if the expanded command has changed. This in turn
1071 * requires that all variables are set in the same way that they
1072 * would be if the target needs to be re-built.
1076 meta_name(fname, sizeof(fname), dname, tname, dname);
1078 #ifdef DEBUG_META_MODE
1080 fprintf(debug_file, "meta_oodate: %s\n", fname);
1083 if ((fp = fopen(fname, "r")) != NULL) {
1084 static char *buf = NULL;
1085 static size_t bufsz;
1095 buf = bmake_malloc(bufsz);
1099 if (getcwd(cwd, sizeof(cwd)) == NULL)
1100 err(1, "Could not get current working directory");
1101 cwdlen = strlen(cwd);
1103 strlcpy(lcwd, cwd, sizeof(lcwd));
1104 strlcpy(latestdir, cwd, sizeof(latestdir));
1107 tmpdir = getTmpdir();
1108 tmplen = strlen(tmpdir);
1111 /* we want to track all the .meta we read */
1112 Var_Append(".MAKE.META.FILES", fname, VAR_GLOBAL);
1114 ln = Lst_First(gn->commands);
1115 while (!oodate && (x = fgetLine(&buf, &bufsz, 0, fp)) > 0) {
1117 if (buf[x - 1] == '\n')
1120 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1126 /* Find the start of the build monitor section. */
1127 if (!have_filemon) {
1128 if (strncmp(buf, "-- filemon", 10) == 0) {
1129 have_filemon = TRUE;
1132 if (strncmp(buf, "# buildmon", 10) == 0) {
1133 have_filemon = TRUE;
1138 /* Delimit the record type. */
1140 #ifdef DEBUG_META_MODE
1142 fprintf(debug_file, "%s: %d: %s\n", fname, lineno, buf);
1147 * We are in the 'filemon' output section.
1148 * Each record from filemon follows the general form:
1150 * <key> <pid> <data>
1153 * <key> is a single letter, denoting the syscall.
1154 * <pid> is the process that made the syscall.
1155 * <data> is the arguments (of interest).
1158 case '#': /* comment */
1159 case 'V': /* version */
1163 * We need to track pathnames per-process.
1165 * Each process run by make, starts off in the 'CWD'
1166 * recorded in the .meta file, if it chdirs ('C')
1167 * elsewhere we need to track that - but only for
1168 * that process. If it forks ('F'), we initialize
1169 * the child to have the same cwd as its parent.
1171 * We also need to track the 'latestdir' of
1172 * interest. This is usually the same as cwd, but
1173 * not if a process is reading directories.
1175 * Each time we spot a different process ('pid')
1176 * we save the current value of 'latestdir' in a
1177 * variable qualified by 'lastpid', and
1178 * re-initialize 'latestdir' to any pre-saved
1179 * value for the current 'pid' and 'CWD' if none.
1181 CHECK_VALID_META(p);
1183 if (pid > 0 && pid != lastpid) {
1188 /* We need to remember these. */
1189 Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0);
1190 Var_Set(ldir_vname, latestdir, VAR_GLOBAL, 0);
1192 snprintf(lcwd_vname, sizeof(lcwd_vname), LCWD_VNAME_FMT, pid);
1193 snprintf(ldir_vname, sizeof(ldir_vname), LDIR_VNAME_FMT, pid);
1195 ldir = Var_Value(ldir_vname, VAR_GLOBAL, &tp);
1197 strlcpy(latestdir, ldir, sizeof(latestdir));
1200 ldir = Var_Value(lcwd_vname, VAR_GLOBAL, &tp);
1202 strlcpy(lcwd, ldir, sizeof(lcwd));
1206 /* Skip past the pid. */
1207 if (strsep(&p, " ") == NULL)
1209 #ifdef DEBUG_META_MODE
1211 fprintf(debug_file, "%s: %d: %d: %c: cwd=%s lcwd=%s ldir=%s\n",
1213 pid, buf[0], cwd, lcwd, latestdir);
1218 CHECK_VALID_META(p);
1220 /* Process according to record type. */
1222 case 'X': /* eXit */
1223 Var_Delete(lcwd_vname, VAR_GLOBAL);
1224 Var_Delete(ldir_vname, VAR_GLOBAL);
1225 lastpid = 0; /* no need to save ldir_vname */
1228 case 'F': /* [v]Fork */
1235 snprintf(cldir, sizeof(cldir), LCWD_VNAME_FMT, child);
1236 Var_Set(cldir, lcwd, VAR_GLOBAL, 0);
1237 snprintf(cldir, sizeof(cldir), LDIR_VNAME_FMT, child);
1238 Var_Set(cldir, latestdir, VAR_GLOBAL, 0);
1239 #ifdef DEBUG_META_MODE
1241 fprintf(debug_file, "%s: %d: %d: cwd=%s lcwd=%s ldir=%s\n",
1243 child, cwd, lcwd, latestdir);
1249 case 'C': /* Chdir */
1250 /* Update lcwd and latest directory. */
1251 strlcpy(latestdir, p, sizeof(latestdir));
1252 strlcpy(lcwd, p, sizeof(lcwd));
1253 Var_Set(lcwd_vname, lcwd, VAR_GLOBAL, 0);
1254 Var_Set(ldir_vname, lcwd, VAR_GLOBAL, 0);
1255 #ifdef DEBUG_META_MODE
1257 fprintf(debug_file, "%s: %d: cwd=%s ldir=%s\n", fname, lineno, cwd, lcwd);
1261 case 'M': /* renaMe */
1263 * For 'M'oves we want to check
1264 * the src as for 'R'ead
1265 * and the target as for 'W'rite.
1267 cp = p; /* save this for a second */
1268 /* now get target */
1269 if (strsep(&p, " ") == NULL)
1271 CHECK_VALID_META(p);
1274 /* 'L' and 'M' put single quotes around the args */
1276 DEQUOTE(move_target);
1278 case 'D': /* unlink */
1279 if (*p == '/' && !Lst_IsEmpty(missingFiles)) {
1280 /* remove any missingFiles entries that match p */
1281 if ((ln = Lst_Find(missingFiles, p,
1282 path_match)) != NULL) {
1287 nln = Lst_FindFrom(missingFiles, Lst_Succ(ln),
1290 Lst_Remove(missingFiles, ln);
1292 } while ((ln = nln) != NULL);
1295 if (buf[0] == 'M') {
1296 /* the target of the mv is a file 'W'ritten */
1297 #ifdef DEBUG_META_MODE
1299 fprintf(debug_file, "meta_oodate: M %s -> %s\n",
1306 case 'L': /* Link */
1309 * the src as for 'R'ead
1310 * and the target as for 'W'rite.
1313 /* now get target */
1314 if (strsep(&p, " ") == NULL)
1316 CHECK_VALID_META(p);
1317 /* 'L' and 'M' put single quotes around the args */
1320 #ifdef DEBUG_META_MODE
1322 fprintf(debug_file, "meta_oodate: L %s -> %s\n",
1326 case 'W': /* Write */
1329 * If a file we generated within our bailiwick
1330 * but outside of .OBJDIR is missing,
1331 * we need to do it again.
1333 /* ignore non-absolute paths */
1337 if (Lst_IsEmpty(metaBailiwick))
1340 /* ignore cwd - normal dependencies handle those */
1341 if (strncmp(p, cwd, cwdlen) == 0)
1344 if (!Lst_ForEach(metaBailiwick, prefix_match, p))
1347 /* tmpdir might be within */
1348 if (tmplen > 0 && strncmp(p, tmpdir, tmplen) == 0)
1351 /* ignore anything containing the string "tmp" */
1352 if ((strstr("tmp", p)))
1355 if ((link_src != NULL && cached_lstat(p, &fs) < 0) ||
1356 (link_src == NULL && cached_stat(p, &fs) < 0)) {
1357 if (!meta_ignore(gn, p)) {
1358 if (Lst_Find(missingFiles, p, string_match) == NULL)
1359 Lst_AtEnd(missingFiles, bmake_strdup(p));
1366 #ifdef DEBUG_META_MODE
1368 fprintf(debug_file, "meta_oodate: L src %s\n", p);
1371 case 'R': /* Read */
1372 case 'E': /* Exec */
1374 * Check for runtime files that can't
1375 * be part of the dependencies because
1376 * they are _expected_ to change.
1378 if (meta_ignore(gn, p))
1382 * The rest of the record is the file name.
1383 * Check if it's not an absolute path.
1392 sdirs[sdx++] = p; /* done */
1394 if (strcmp(".", p) == 0)
1395 continue; /* no point */
1397 /* Check vs latestdir */
1398 snprintf(fname1, sizeof(fname1), "%s/%s", latestdir, p);
1399 sdirs[sdx++] = fname1;
1401 if (strcmp(latestdir, lcwd) != 0) {
1403 snprintf(fname2, sizeof(fname2), "%s/%s", lcwd, p);
1404 sdirs[sdx++] = fname2;
1406 if (strcmp(lcwd, cwd) != 0) {
1408 snprintf(fname3, sizeof(fname3), "%s/%s", cwd, p);
1409 sdirs[sdx++] = fname3;
1412 sdirs[sdx++] = NULL;
1414 for (sdp = sdirs; *sdp && !found; sdp++) {
1415 #ifdef DEBUG_META_MODE
1417 fprintf(debug_file, "%s: %d: looking for: %s\n", fname, lineno, *sdp);
1419 if (cached_stat(*sdp, &fs) == 0) {
1425 #ifdef DEBUG_META_MODE
1427 fprintf(debug_file, "%s: %d: found: %s\n", fname, lineno, p);
1429 if (!S_ISDIR(fs.st_mode) &&
1430 fs.st_mtime > gn->mtime) {
1432 fprintf(debug_file, "%s: %d: file '%s' is newer than the target...\n", fname, lineno, p);
1434 } else if (S_ISDIR(fs.st_mode)) {
1435 /* Update the latest directory. */
1436 cached_realpath(p, latestdir);
1438 } else if (errno == ENOENT && *p == '/' &&
1439 strncmp(p, cwd, cwdlen) != 0) {
1441 * A referenced file outside of CWD is missing.
1442 * We cannot catch every eventuality here...
1444 if (Lst_Find(missingFiles, p, string_match) == NULL)
1445 Lst_AtEnd(missingFiles, bmake_strdup(p));
1448 if (buf[0] == 'E') {
1449 /* previous latestdir is no longer relevant */
1450 strlcpy(latestdir, lcwd, sizeof(latestdir));
1456 if (!oodate && buf[0] == 'L' && link_src != NULL)
1457 goto check_link_src;
1458 } else if (strcmp(buf, "CMD") == 0) {
1460 * Compare the current command with the one in the
1465 fprintf(debug_file, "%s: %d: there were more build commands in the meta data file than there are now...\n", fname, lineno);
1468 char *cmd = (char *)Lst_Datum(ln);
1469 Boolean hasOODATE = FALSE;
1471 if (strstr(cmd, "$?"))
1473 else if ((cp = strstr(cmd, ".OODATE"))) {
1474 /* check for $[{(].OODATE[:)}] */
1475 if (cp > cmd + 2 && cp[-2] == '$')
1481 fprintf(debug_file, "%s: %d: cannot compare command using .OODATE\n", fname, lineno);
1483 cmd = Var_Subst(NULL, cmd, gn, VARF_WANTRES|VARF_UNDEFERR);
1485 if ((cp = strchr(cmd, '\n'))) {
1489 * This command contains newlines, we need to
1490 * fetch more from the .meta file before we
1491 * attempt a comparison.
1493 /* first put the newline back at buf[x - 1] */
1496 /* now fetch the next line */
1497 if ((n = fgetLine(&buf, &bufsz, x, fp)) <= 0)
1501 if (buf[x - 1] != '\n') {
1502 warnx("%s: %d: line truncated at %u", fname, lineno, x);
1505 cp = strchr(++cp, '\n');
1507 if (buf[x - 1] == '\n')
1511 !(gn->type & OP_NOMETA_CMP) &&
1512 strcmp(p, cmd) != 0) {
1514 fprintf(debug_file, "%s: %d: a build command has changed\n%s\nvs\n%s\n", fname, lineno, p, cmd);
1515 if (!metaIgnoreCMDs)
1521 } else if (strcmp(buf, "CWD") == 0) {
1523 * Check if there are extra commands now
1524 * that weren't in the meta data file.
1526 if (!oodate && ln != NULL) {
1528 fprintf(debug_file, "%s: %d: there are extra build commands now that weren't in the meta data file\n", fname, lineno);
1531 if (strcmp(p, cwd) != 0) {
1533 fprintf(debug_file, "%s: %d: the current working directory has changed from '%s' to '%s'\n", fname, lineno, p, curdir);
1540 if (!Lst_IsEmpty(missingFiles)) {
1542 fprintf(debug_file, "%s: missing files: %s...\n",
1543 fname, (char *)Lst_Datum(Lst_First(missingFiles)));
1546 if (!oodate && !have_filemon && filemonMissing) {
1548 fprintf(debug_file, "%s: missing filemon data\n", fname);
1552 if (writeMeta && metaMissing) {
1555 /* if target is in .CURDIR we do not need a meta file */
1556 if (gn->path && (cp = strrchr(gn->path, '/')) && cp > gn->path) {
1557 if (strncmp(curdir, gn->path, (cp - gn->path)) != 0) {
1558 cp = NULL; /* not in .CURDIR */
1563 fprintf(debug_file, "%s: required but missing\n", fname);
1565 needOODATE = TRUE; /* assume the worst */
1570 Lst_Destroy(missingFiles, (FreeProc *)free);
1572 if (oodate && needOODATE) {
1574 * Target uses .OODATE which is empty; or we wouldn't be here.
1575 * We have decided it is oodate, so .OODATE needs to be set.
1576 * All we can sanely do is set it to .ALLSRC.
1578 Var_Delete(OODATE, gn);
1579 Var_Set(OODATE, Var_Value(ALLSRC, gn, &cp), gn, 0);
1584 for (i--; i >= 0; i--) {
1590 /* support for compat mode */
1592 static int childPipe[2];
1595 meta_compat_start(void)
1597 #ifdef USE_FILEMON_ONCE
1599 * We need to re-open filemon for each cmd.
1601 BuildMon *pbm = &Mybm;
1603 if (pbm->mfp != NULL && useFilemon) {
1606 pbm->mon_fd = pbm->filemon_fd = -1;
1609 if (pipe(childPipe) < 0)
1610 Punt("Cannot create pipe: %s", strerror(errno));
1611 /* Set close-on-exec flag for both */
1612 (void)fcntl(childPipe[0], F_SETFD, FD_CLOEXEC);
1613 (void)fcntl(childPipe[1], F_SETFD, FD_CLOEXEC);
1617 meta_compat_child(void)
1619 meta_job_child(NULL);
1620 if (dup2(childPipe[1], 1) < 0 ||
1622 execError("dup2", "pipe");
1628 meta_compat_parent(void)
1633 close(childPipe[1]); /* child side */
1634 fp = fdopen(childPipe[0], "r");
1635 while (fgets(buf, sizeof(buf), fp)) {
1636 meta_job_output(NULL, buf, "");
1643 #endif /* USE_META */