2 * Copyright (c) 1988, 1989, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1989 by Berkeley Softworks
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#) Copyright (c) 1988, 1989, 1990, 1993 The Regents of the University of California. All rights reserved.
39 * @(#)main.c 8.3 (Berkeley) 3/19/94
40 * $FreeBSD: src/usr.bin/make/main.c,v 1.35.2.10 2003/12/16 08:34:11 des Exp $
41 * $DragonFly: src/usr.bin/make/main.c,v 1.51 2005/01/31 21:11:26 okumoto Exp $
46 * The main file for this entire program. Exit routines etc
49 * Utility functions defined in this file:
50 * Main_ParseArgLine Takes a line of arguments, breaks them and
51 * treats them as if they were given when first
52 * invoked. Used by the parse module to implement
57 #include <sys/utsname.h>
59 #include <sys/param.h>
60 #include <sys/types.h>
70 #include <sys/sysctl.h>
84 #include "pathnames.h"
91 #define WANT_ENV_MKLVL 1
92 #define MKLVL_MAXVAL 500
93 #define MKLVL_ENVVAR "__MKLVL__"
95 #define MAKEFLAGS ".MAKEFLAGS"
97 /* Targets to be made */
98 Lst create = Lst_Initializer(create);
100 time_t now; /* Time at start of make */
101 GNode *DEFAULT; /* .DEFAULT node */
102 Boolean allPrecious; /* .PRECIOUS given on line by itself */
104 static Boolean noBuiltins; /* -r flag */
106 /* ordered list of makefiles to read */
107 static Lst makefiles = Lst_Initializer(makefiles);
109 static Boolean expandVars; /* fully expand printed variables */
111 /* list of variables to print */
112 static Lst variables = Lst_Initializer(variables);
114 int maxJobs; /* -j argument */
115 static Boolean forceJobs; /* -j argument given */
116 Boolean compatMake; /* -B argument */
117 Boolean debug; /* -d flag */
118 Boolean noExecute; /* -n flag */
119 Boolean keepgoing; /* -k flag */
120 Boolean queryFlag; /* -q flag */
121 Boolean touchFlag; /* -t flag */
122 Boolean usePipes; /* !-P flag */
123 Boolean ignoreErrors; /* -i flag */
124 Boolean beSilent; /* -s flag */
125 Boolean beVerbose; /* -v flag */
126 Boolean oldVars; /* variable substitution style */
127 Boolean checkEnvFirst; /* -e flag */
129 /* (-E) vars to override from env */
130 Lst envFirstVars = Lst_Initializer(envFirstVars);
132 Boolean jobsRunning; /* TRUE if the jobs might be running */
134 static void MainParseArgs(int, char **);
135 char *chdir_verify_path(const char *, char *);
136 static int ReadMakefile(const void *, const void *);
137 static void usage(void);
139 static char *curdir; /* startup directory */
140 static char *objdir; /* where we chdir'ed to */
143 * Append a flag with an optional argument to MAKEFLAGS and MFLAGS
146 MFLAGS_append(const char *flag, char *arg)
148 Var_Append(MAKEFLAGS, flag, VAR_GLOBAL);
150 char *str = MAKEFLAGS_quote(arg);
151 Var_Append(MAKEFLAGS, str, VAR_GLOBAL);
155 Var_Append("MFLAGS", flag, VAR_GLOBAL);
157 char *str = MAKEFLAGS_quote(arg);
158 Var_Append("MFLAGS", str, VAR_GLOBAL);
165 * Parse a given argument vector. Called from main() and from
166 * Main_ParseArgLine() when the .MAKEFLAGS target is used.
168 * XXX: Deal with command line overriding .MAKEFLAGS in makefile
174 * Various global and local flags will be set depending on the flags
178 MainParseArgs(int argc, char **argv)
182 optind = 1; /* since we're called more than once */
183 #define OPTFLAGS "BC:D:E:I:PSV:Xd:ef:ij:km:nqrstv"
184 rearg: while((c = getopt(argc, argv, OPTFLAGS)) != -1) {
187 if (chdir(optarg) == -1)
188 err(1, "chdir %s", optarg);
191 Var_Set(optarg, "1", VAR_GLOBAL);
192 MFLAGS_append("-D", optarg);
195 Parse_AddIncludeDir(optarg);
196 MFLAGS_append("-I", optarg);
199 Lst_AtEnd(&variables, estrdup(optarg));
200 MFLAGS_append("-V", optarg);
207 MFLAGS_append("-B", NULL);
208 unsetenv("MAKE_JOBS_FIFO");
212 MFLAGS_append("-P", NULL);
216 MFLAGS_append("-S", NULL);
219 char *modules = optarg;
221 for (; *modules; ++modules)
239 if (modules[1] == '1') {
240 debug |= DEBUG_GRAPH1;
243 else if (modules[1] == '2') {
244 debug |= DEBUG_GRAPH2;
267 warnx("illegal argument to d option -- %c", *modules);
270 MFLAGS_append("-d", optarg);
274 Lst_AtEnd(&envFirstVars, estrdup(optarg));
275 MFLAGS_append("-E", optarg);
278 checkEnvFirst = TRUE;
279 MFLAGS_append("-e", NULL);
282 Lst_AtEnd(&makefiles, estrdup(optarg));
286 MFLAGS_append("-i", NULL);
292 maxJobs = strtol(optarg, &endptr, 10);
293 if (maxJobs <= 0 || *endptr != '\0') {
294 warnx("illegal number, -j argument -- %s",
298 MFLAGS_append("-j", optarg);
303 MFLAGS_append("-k", NULL);
306 Dir_AddDir(&sysIncPath, optarg);
307 MFLAGS_append("-m", optarg);
311 MFLAGS_append("-n", NULL);
315 /* Kind of nonsensical, wot? */
316 MFLAGS_append("-q", NULL);
320 MFLAGS_append("-r", NULL);
324 MFLAGS_append("-s", NULL);
328 MFLAGS_append("-t", NULL);
332 MFLAGS_append("-v", NULL);
343 * See if the rest of the arguments are variable assignments and
344 * perform them if so. Else take them to be targets and stuff them
345 * on the end of the "create" list.
347 for (argv += optind, argc -= optind; *argv; ++argv, --argc)
348 if (Parse_IsVar(*argv)) {
349 char *ptr = MAKEFLAGS_quote(*argv);
351 Var_Append(MAKEFLAGS, ptr, VAR_GLOBAL);
354 Parse_DoVar(*argv, VAR_CMD);
357 Punt("illegal (null) argument.");
360 optind = 0; /* -flag... */
365 Lst_AtEnd(&create, estrdup(*argv));
370 * Main_ParseArgLine --
371 * Used by the parse module when a .MFLAGS or .MAKEFLAGS target
372 * is encountered and by main() when reading the .MAKEFLAGS envariable.
373 * Takes a line of arguments and breaks it into its
374 * component words and passes those words and the number of them to the
375 * MainParseArgs function.
376 * The line should have all its leading whitespace removed.
382 * Only those that come from the various arguments.
385 Main_ParseArgLine(char *line, int mflags)
387 char **argv; /* Manufactured argument vector */
388 int argc; /* Number of arguments in argv */
392 for (; *line == ' '; ++line)
398 argv = MAKEFLAGS_break(line, &argc);
400 argv = brk_string(line, &argc, TRUE);
401 MainParseArgs(argc, argv);
405 chdir_verify_path(const char *path, char *obpath)
409 if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
410 if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) {
411 warn("warning: %s", path);
421 catch_child(int sig __unused)
426 * In lieu of a good way to prevent every possible looping in
427 * make(1), stop there from being more than MKLVL_MAXVAL processes forked
428 * by make(1), to prevent a forkbomb from happening, in a dumb and
432 check_make_level(void)
434 #ifdef WANT_ENV_MKLVL
435 char *value = getenv(MKLVL_ENVVAR);
436 int level = (value == NULL) ? 0 : atoi(value);
439 errc(2, EAGAIN, "Invalid value for recursion level (%d).", level);
440 } else if (level > MKLVL_MAXVAL) {
441 errc(2, EAGAIN, "Max recursion level (%d) exceeded.", MKLVL_MAXVAL);
444 sprintf(new_value, "%d", level + 1);
445 setenv(MKLVL_ENVVAR, new_value, 1);
447 #endif /* WANT_ENV_MKLVL */
452 * The main function, for obvious reasons. Initializes variables
453 * and a few modules, then parses the arguments give it in the
454 * environment and on the command line. Reads the system makefile
455 * followed by either Makefile, makefile or the file given by the
456 * -f argument. Sets the .MAKEFLAGS PMake variable based on all the
457 * flags it has received by then uses either the Make or the Compat
458 * module to create the initial list of targets.
461 * If -q was given, exits -1 if anything was out-of-date. Else it exits
465 * The program exits when done. Targets are created. etc. etc. etc.
468 main(int argc, char **argv)
470 Boolean outOfDate = TRUE; /* FALSE if all targets up to date */
474 char mdpath[MAXPATHLEN];
475 char obpath[MAXPATHLEN];
476 char cdpath[MAXPATHLEN];
477 const char *machine = getenv("MACHINE");
478 const char *machine_arch = getenv("MACHINE_ARCH");
479 const char *machine_cpu = getenv("MACHINE_CPU");
480 char *cp = NULL, *start;
481 /* avoid faults on read-only strings */
482 static char syspath[] = _PATH_DEFSYSPATH;
486 * Catch SIGCHLD so that we get kicked out of select() when we
487 * need to look at a child. This is only known to matter for the
488 * -j case (perhaps without -P).
490 * XXX this is intentionally misplaced.
494 sigemptyset(&sa.sa_mask);
495 sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
496 sa.sa_handler = catch_child;
497 sigaction(SIGCHLD, &sa, NULL);
504 * Turn off ENV to make ksh happier.
511 * get rid of resource limit on file descriptors
515 if (getrlimit(RLIMIT_NOFILE, &rl) != -1 &&
516 rl.rlim_cur != rl.rlim_max) {
517 rl.rlim_cur = rl.rlim_max;
518 setrlimit(RLIMIT_NOFILE, &rl);
524 * PC-98 kernel sets the `i386' string to the utsname.machine and
525 * it cannot be distinguished from IBM-PC by uname(3). Therefore,
526 * we check machine.ispc98 and adjust the machine variable before
527 * using usname(3) below.
528 * NOTE: machdep.ispc98 was defined on 1998/8/31. At that time,
529 * __FreeBSD_version was defined as 300003. So, this check can
530 * safely be done with any kernel with version > 300003.
536 len = sizeof(ispc98);
537 if (!sysctlbyname("machdep.ispc98", &ispc98, &len, NULL, 0)) {
544 * Get the name of this type of MACHINE from utsname
545 * so we can share an executable for similar machines.
546 * (i.e. m68k: amiga hp300, mac68k, sun3, ...)
548 * Note that while MACHINE is decided at run-time,
549 * MACHINE_ARCH is always known at compile time.
553 struct utsname utsname;
555 if (uname(&utsname) == -1)
557 machine = utsname.machine;
565 machine_arch = "unknown";
567 machine_arch = MACHINE_ARCH;
572 * Set machine_cpu to the minumum supported CPU revision based
573 * on the target architecture, if not already set.
576 if (!strcmp(machine_arch, "i386"))
577 machine_cpu = "i386";
578 else if (!strcmp(machine_arch, "alpha"))
581 machine_cpu = "unknown";
585 beSilent = FALSE; /* Print commands as executed */
586 ignoreErrors = FALSE; /* Pay attention to non-zero returns */
587 noExecute = FALSE; /* Execute all commands */
588 keepgoing = FALSE; /* Stop on error */
589 allPrecious = FALSE; /* Remove targets when interrupted */
590 queryFlag = FALSE; /* This is not just a check-run */
591 noBuiltins = FALSE; /* Read the built-in rules */
592 touchFlag = FALSE; /* Actually update targets */
593 usePipes = TRUE; /* Catch child output in pipes */
594 debug = 0; /* No debug verbosity, please. */
597 maxJobs = DEFMAXJOBS;
598 forceJobs = FALSE; /* No -j flag */
599 compatMake = FALSE; /* No compat mode */
602 * Initialize the parsing, directory and variable modules to prepare
603 * for the reading of inclusion paths and variable settings on the
606 Dir_Init(); /* Initialize directory structures so -I flags
607 * can be processed correctly */
608 Parse_Init(); /* Need to initialize the paths of #include
610 Var_Init(); /* As well as the lists of variables for
611 * parsing arguments */
615 * Initialize various variables.
616 * MAKE also gets this name, for compatibility
617 * .MAKEFLAGS gets set to the empty string just in case.
618 * MFLAGS also gets initialized empty, for compatibility.
620 Var_Set("MAKE", argv[0], VAR_GLOBAL);
621 Var_Set(MAKEFLAGS, "", VAR_GLOBAL);
622 Var_Set("MFLAGS", "", VAR_GLOBAL);
623 Var_Set("MACHINE", machine, VAR_GLOBAL);
624 Var_Set("MACHINE_ARCH", machine_arch, VAR_GLOBAL);
625 Var_Set("MACHINE_CPU", machine_cpu, VAR_GLOBAL);
627 Var_Set("MAKE_VERSION", MAKE_VERSION, VAR_GLOBAL);
631 * First snag any flags out of the MAKE environment variable.
632 * (Note this is *not* MAKEFLAGS since /bin/make uses that and it's
633 * in a different format).
635 Main_ParseArgLine(getenv("MAKEFLAGS"), 1);
637 MainParseArgs(argc, argv);
640 * Find where we are...
641 * All this code is so that we know where we are when we start up
642 * on a different machine with pmake.
645 if (getcwd(curdir, MAXPATHLEN) == NULL)
650 if (stat(curdir, &sa) == -1)
651 err(2, "%s", curdir);
655 * The object directory location is determined using the
656 * following order of preference:
658 * 1. MAKEOBJDIRPREFIX`cwd`
660 * 3. _PATH_OBJDIR.${MACHINE}
662 * 5. _PATH_OBJDIRPREFIX`cwd`
664 * If one of the first two fails, use the current directory.
665 * If the remaining three all fail, use the current directory.
667 * Once things are initted,
668 * have to add the original directory to the search path,
669 * and modify the paths for the Makefiles apropriately. The
670 * current directory is also placed as a variable for make scripts.
672 if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) {
673 if (!(path = getenv("MAKEOBJDIR"))) {
675 pathp = _PATH_OBJDIRPREFIX;
676 snprintf(mdpath, MAXPATHLEN, "%s.%s",
678 if (!(objdir = chdir_verify_path(mdpath, obpath)))
679 if (!(objdir=chdir_verify_path(path, obpath))) {
680 snprintf(mdpath, MAXPATHLEN,
681 "%s%s", pathp, curdir);
682 if (!(objdir=chdir_verify_path(mdpath,
687 else if (!(objdir = chdir_verify_path(path, obpath)))
691 snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir);
692 if (!(objdir = chdir_verify_path(mdpath, obpath)))
695 Dir_InitDot(); /* Initialize the "." directory */
696 if (objdir != curdir)
697 Dir_AddDir(&dirSearchPath, curdir);
698 Var_Set(".DIRECTIVE_MAKEENV", "YES", VAR_GLOBAL);
699 Var_Set(".CURDIR", curdir, VAR_GLOBAL);
700 Var_Set(".OBJDIR", objdir, VAR_GLOBAL);
702 if (getenv("MAKE_JOBS_FIFO") != NULL)
705 * Be compatible if user did not specify -j and did not explicitly
706 * turned compatibility on
708 if (!compatMake && !forceJobs)
712 * Initialize archive, target and suffix modules in preparation for
713 * parsing the makefile(s)
723 * Set up the .TARGETS variable to contain the list of targets to be
724 * created. If none specified, make the variable empty -- the parser
725 * will fill the thing in with the default or .MAIN target.
727 if (!Lst_IsEmpty(&create)) {
730 for (ln = Lst_First(&create); ln != NULL; ln = Lst_Succ(ln)) {
731 char *name = Lst_Datum(ln);
733 Var_Append(".TARGETS", name, VAR_GLOBAL);
736 Var_Set(".TARGETS", "", VAR_GLOBAL);
740 * If no user-supplied system path was given (through the -m option)
741 * add the directories from the DEFSYSPATH (more than one may be given
742 * as dir1:...:dirn) to the system include path.
744 if (Lst_IsEmpty(&sysIncPath)) {
745 for (start = syspath; *start != '\0'; start = cp) {
746 for (cp = start; *cp != '\0' && *cp != ':'; cp++)
749 Dir_AddDir(&sysIncPath, start);
752 Dir_AddDir(&sysIncPath, start);
758 * Read in the built-in rules first, followed by the specified
759 * makefile, if it was (makefile != (char *) NULL), or the default
760 * Makefile and makefile, in that order, if it wasn't.
764 Lst sysMkPath = Lst_Initializer(sysMkPath);
767 Dir_Expand(_PATH_DEFSYSMK, &sysIncPath, &sysMkPath);
768 if (Lst_IsEmpty(&sysMkPath))
769 Fatal("make: no system rules (%s).", _PATH_DEFSYSMK);
770 ln = Lst_Find(&sysMkPath, NULL, ReadMakefile);
772 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
773 Lst_Destroy(&sysMkPath, free);
776 if (!Lst_IsEmpty(&makefiles)) {
779 ln = Lst_Find(&makefiles, NULL, ReadMakefile);
781 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
782 } else if (!ReadMakefile("BSDmakefile", NULL))
783 if (!ReadMakefile("makefile", NULL))
784 ReadMakefile("Makefile", NULL);
786 ReadMakefile(".depend", NULL);
788 /* Install all the flags into the MAKE envariable. */
789 if (((p = Var_Value(MAKEFLAGS, VAR_GLOBAL, &p1)) != NULL) && *p)
790 setenv("MAKEFLAGS", p, 1);
794 * For compatibility, look at the directories in the VPATH variable
795 * and add them to the search path, if the variable is defined. The
796 * variable's value is in the same format as the PATH envariable, i.e.
797 * <directory>:<directory>:<directory>...
799 if (Var_Exists("VPATH", VAR_CMD)) {
801 * GCC stores string constants in read-only memory, but
802 * Var_Subst will want to write this thing, so store it
805 static char VPATH[] = "${VPATH}";
810 buf = Var_Subst(NULL, VPATH, VAR_CMD, FALSE);
812 vpath = Buf_GetAll(buf, NULL);
816 /* skip to end of directory name */
817 for (ptr = vpath; *ptr != ':' && *ptr != '\0'; ptr++)
820 /* Save terminator character so know when to stop */
824 /* Add directory to search path */
825 Dir_AddDir(&dirSearchPath, vpath);
828 } while (savec != '\0');
830 Buf_Destroy(buf, TRUE);
834 * Now that all search paths have been read for suffixes et al, it's
835 * time to add the default search path to their lists...
839 /* print the initial graph, if the user requested it */
843 if (Lst_IsEmpty(&variables)) {
845 * Since the user has not requested that any variables
846 * be printed, we can build targets.
848 * Someone please tell me what the following comment
851 * Have now read the entire graph and need to make
852 * a list of targets to create. If none was given
853 * on the command line, we consult the parsing
854 * module to find the main target(s) to create.
856 Lst targs = Lst_Initializer(targs);
858 if (Lst_IsEmpty(&create))
859 Parse_MainName(&targs);
861 Targ_FindList(&targs, &create, TARG_CREATE);
865 * Compat_Init will take care of creating
866 * all the targets as well as initializing
873 * Initialize job module before traversing
874 * the graph, now that any .BEGIN and .END
875 * targets have been read. This is done
876 * only if the -q flag wasn't given (to
877 * prevent the .BEGIN from being executed
885 /* Traverse the graph, checking on all the targets */
886 outOfDate = Make_Run(&targs);
888 Lst_Destroy(&targs, NOFREE);
892 * Print the values of any variables requested by
897 for (n = Lst_First(&variables); n != NULL; n = Lst_Succ(n)) {
898 const char *name = Lst_Datum(n);
904 v = emalloc(strlen(name) + 1 + 3);
905 sprintf(v, "${%s}", name);
907 buf = Var_Subst(NULL, v, VAR_GLOBAL, FALSE);
908 value = Buf_GetAll(buf, NULL);
909 printf("%s\n", value);
911 Buf_Destroy(buf, FALSE);
915 value = Var_Value(name, VAR_GLOBAL, &p1);
916 printf("%s\n", value ? value : "");
923 Lst_Destroy(&variables, free);
924 Lst_Destroy(&makefiles, free);
925 Lst_Destroy(&create, free);
927 /* print the graph now it's been processed if the user requested it */
931 if (queryFlag && outOfDate)
939 * Open and parse the given makefile.
942 * TRUE if ok. FALSE if couldn't open file.
948 ReadMakefile(const void *p, const void *q __unused)
950 char *fname; /* makefile to read */
952 char *name, path[MAXPATHLEN];
956 /* XXX - remove this once constification is done */
959 if (!strcmp(fname, "-")) {
960 Parse_File("(stdin)", stdin);
961 Var_Set("MAKEFILE", "", VAR_GLOBAL);
963 setMAKEFILE = strcmp(fname, ".depend");
965 /* if we've chdir'd, rebuild the path name */
966 if (curdir != objdir && *fname != '/') {
967 snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname);
969 * XXX The realpath stuff breaks relative includes
970 * XXX in some cases. The problem likely is in
971 * XXX parse.c where it does special things in
972 * XXX ParseDoInclude if the file is relateive
973 * XXX or absolute and not a system file. There
974 * XXX it assumes that if the current file that's
975 * XXX being included is absolute, that any files
976 * XXX that it includes shouldn't do the -I path
977 * XXX stuff, which is inconsistant with historical
978 * XXX behavior. However, I can't pentrate the mists
979 * XXX further, so I'm putting this workaround in
980 * XXX here until such time as the underlying bug
983 #if THIS_BREAKS_THINGS
984 if (realpath(path, path) != NULL &&
985 (stream = fopen(path, "r")) != NULL) {
990 } else if (realpath(fname, path) != NULL) {
993 if ((stream = fopen(fname, "r")) != NULL)
997 if ((stream = fopen(path, "r")) != NULL) {
1004 if ((stream = fopen(fname, "r")) != NULL)
1008 /* look in -I and system include directories. */
1009 name = Dir_FindFile(fname, &parseIncPath);
1011 name = Dir_FindFile(fname, &sysIncPath);
1012 if (!name || !(stream = fopen(name, "r")))
1014 MAKEFILE = fname = name;
1016 * set the MAKEFILE variable desired by System V fans -- the
1017 * placement of the setting here means it gets set to the last
1018 * makefile specified, as it is set by SysV make.
1022 Var_Set("MAKEFILE", MAKEFILE, VAR_GLOBAL);
1023 Parse_File(fname, stream);
1031 * Execute the command in cmd, and return the output of that command
1035 * A string containing the output of the command, or the empty string
1036 * If error is not NULL, it contains the reason for the command failure
1039 * The string must be freed by the caller.
1042 Cmd_Exec(const char *cmd, const char **error)
1044 int fds[2]; /* Pipe streams */
1045 int cpid; /* Child PID */
1046 int pid; /* PID from wait() */
1047 int status; /* command exit status */
1048 Buffer *buf; /* buffer to store the result */
1054 if (shellPath == NULL)
1057 * Open a pipe for fetching its output
1059 if (pipe(fds) == -1) {
1060 *error = "Couldn't create pipe for \"%s\"";
1067 switch (cpid = vfork()) {
1070 * Close input side of pipe
1075 * Duplicate the output stream to the shell's output, then
1076 * shut the extra thing down. Note we don't fetch the error
1077 * stream...why not? Why?
1085 /* Set up arguments for shell */
1086 args[0] = shellName;
1091 execv(shellPath, args);
1097 *error = "Couldn't exec \"%s\"";
1102 * No need for the writing half
1107 char result[BUFSIZ];
1108 rcnt = read(fds[0], result, sizeof(result));
1110 Buf_AddBytes(buf, (size_t)rcnt, (Byte *)result);
1111 } while (rcnt > 0 || (rcnt == -1 && errno == EINTR));
1114 *error = "Error reading shell's output for \"%s\"";
1117 * Close the input side of the pipe.
1122 * Wait for the process to exit.
1124 while (((pid = wait(&status)) != cpid) && (pid >= 0))
1128 *error = "\"%s\" returned non-zero status";
1130 Buf_StripNewlines(buf);
1139 * exit with usage message
1144 fprintf(stderr, "%s\n%s\n%s\n",
1145 "usage: make [-BPSXeiknqrstv] [-C directory] [-D variable] [-d flags]",
1146 " [-E variable] [-f makefile] [-I directory] [-j max_jobs]",
1147 " [-m directory] [-V variable] [variable=value] [target ...]");