main.c revision 133085
1/*
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
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Adam de Boor.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
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.
25 *
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
36 * SUCH DAMAGE.
37 *
38 * @(#)main.c      8.3 (Berkeley) 3/19/94
39 */
40
41#ifndef lint
42#if 0
43static char copyright[] =
44"@(#) Copyright (c) 1988, 1989, 1990, 1993\n\
45	The Regents of the University of California.  All rights reserved.\n";
46#endif
47#endif /* not lint */
48#include <sys/cdefs.h>
49__FBSDID("$FreeBSD: head/usr.bin/make/main.c 133085 2004-08-03 18:56:31Z harti $");
50
51/*-
52 * main.c --
53 *	The main file for this entire program. Exit routines etc
54 *	reside here.
55 *
56 * Utility functions defined in this file:
57 *	Main_ParseArgLine	Takes a line of arguments, breaks them and
58 *				treats them as if they were given when first
59 *				invoked. Used by the parse module to implement
60 *				the .MFLAGS target.
61 */
62
63#include <sys/param.h>
64#include <sys/signal.h>
65#include <sys/stat.h>
66#if defined(__i386__)
67#include <sys/sysctl.h>
68#endif
69#include <sys/time.h>
70#include <sys/resource.h>
71#ifndef MACHINE
72#include <sys/utsname.h>
73#endif
74#include <sys/wait.h>
75
76#include <err.h>
77#include <errno.h>
78#include <fcntl.h>
79#include <signal.h>
80#include <stdarg.h>
81#include <stdio.h>
82#include <stdlib.h>
83#include <sysexits.h>
84#include <unistd.h>
85
86#include "make.h"
87#include "hash.h"
88#include "dir.h"
89#include "job.h"
90#include "pathnames.h"
91
92#define WANT_ENV_MKLVL	1
93
94#ifndef	DEFMAXLOCAL
95#define	DEFMAXLOCAL DEFMAXJOBS
96#endif	/* DEFMAXLOCAL */
97
98#define	MAKEFLAGS	".MAKEFLAGS"
99
100Lst			create;		/* Targets to be made */
101time_t			now;		/* Time at start of make */
102GNode			*DEFAULT;	/* .DEFAULT node */
103Boolean			allPrecious;	/* .PRECIOUS given on line by itself */
104
105static Boolean		noBuiltins;	/* -r flag */
106static Lst		makefiles;	/* ordered list of makefiles to read */
107static Boolean		expandVars;	/* fully expand printed variables */
108static Lst		variables;	/* list of variables to print */
109int			maxJobs;	/* -j argument */
110static Boolean          forceJobs;      /* -j argument given */
111static int		maxLocal;	/* -L argument */
112Boolean			compatMake;	/* -B argument */
113Boolean			debug;		/* -d flag */
114Boolean			noExecute;	/* -n flag */
115Boolean			keepgoing;	/* -k flag */
116Boolean			queryFlag;	/* -q flag */
117Boolean			touchFlag;	/* -t flag */
118Boolean			usePipes;	/* !-P flag */
119Boolean			ignoreErrors;	/* -i flag */
120Boolean			beSilent;	/* -s flag */
121Boolean			beVerbose;	/* -v flag */
122Boolean			oldVars;	/* variable substitution style */
123Boolean			checkEnvFirst;	/* -e flag */
124Lst			envFirstVars;	/* (-E) vars to override from env */
125Boolean			jobsRunning;	/* TRUE if the jobs might be running */
126
127static void		MainParseArgs(int, char **);
128char *			chdir_verify_path(char *, char *);
129static int		ReadMakefile(void *, void *);
130static void		usage(void);
131
132static char *curdir;			/* startup directory */
133static char *objdir;			/* where we chdir'ed to */
134
135/*
136 * Append a flag with an optional argument to MAKEFLAGS and MFLAGS
137 */
138static void
139MFLAGS_append(char *flag, char *arg)
140{
141	Var_Append(MAKEFLAGS, flag, VAR_GLOBAL);
142	if (arg != NULL)
143		Var_Append(MAKEFLAGS, arg, VAR_GLOBAL);
144
145	Var_Append("MFLAGS", flag, VAR_GLOBAL);
146	if (arg != NULL)
147		Var_Append("MFLAGS", arg, VAR_GLOBAL);
148}
149
150/*-
151 * MainParseArgs --
152 *	Parse a given argument vector. Called from main() and from
153 *	Main_ParseArgLine() when the .MAKEFLAGS target is used.
154 *
155 *	XXX: Deal with command line overriding .MAKEFLAGS in makefile
156 *
157 * Results:
158 *	None
159 *
160 * Side Effects:
161 *	Various global and local flags will be set depending on the flags
162 *	given
163 */
164static void
165MainParseArgs(int argc, char **argv)
166{
167	char *p;
168	int c;
169
170	optind = 1;	/* since we're called more than once */
171#ifdef REMOTE
172# define OPTFLAGS "BC:D:E:I:L:PSV:Xd:ef:ij:km:nqrstv"
173#else
174# define OPTFLAGS "BC:D:E:I:PSV:Xd:ef:ij:km:nqrstv"
175#endif
176rearg:	while((c = getopt(argc, argv, OPTFLAGS)) != -1) {
177		switch(c) {
178		case 'C':
179			if (chdir(optarg) == -1)
180				err(1, "chdir %s", optarg);
181			break;
182		case 'D':
183			Var_Set(optarg, "1", VAR_GLOBAL);
184			MFLAGS_append("-D", optarg);
185			break;
186		case 'I':
187			Parse_AddIncludeDir(optarg);
188			MFLAGS_append("-I", optarg);
189			break;
190		case 'V':
191			(void)Lst_AtEnd(variables, (void *)optarg);
192			MFLAGS_append("-V", optarg);
193			break;
194		case 'X':
195			expandVars = FALSE;
196			break;
197		case 'B':
198			compatMake = TRUE;
199			MFLAGS_append("-B", NULL);
200			break;
201#ifdef REMOTE
202		case 'L': {
203			char *endptr;
204
205			maxLocal = strtol(optarg, &endptr, 10);
206			if (maxLocal < 0 || *endptr != '\0') {
207				warnx("illegal number, -L argument -- %s",
208				    optarg);
209				usage();
210			}
211			MFLAGS_append("-L", optarg);
212			break;
213		}
214#endif
215		case 'P':
216			usePipes = FALSE;
217			MFLAGS_append("-P", NULL);
218			break;
219		case 'S':
220			keepgoing = FALSE;
221			MFLAGS_append("-S", NULL);
222			break;
223		case 'd': {
224			char *modules = optarg;
225
226			for (; *modules; ++modules)
227				switch (*modules) {
228				case 'A':
229					debug = ~0;
230					break;
231				case 'a':
232					debug |= DEBUG_ARCH;
233					break;
234				case 'c':
235					debug |= DEBUG_COND;
236					break;
237				case 'd':
238					debug |= DEBUG_DIR;
239					break;
240				case 'f':
241					debug |= DEBUG_FOR;
242					break;
243				case 'g':
244					if (modules[1] == '1') {
245						debug |= DEBUG_GRAPH1;
246						++modules;
247					}
248					else if (modules[1] == '2') {
249						debug |= DEBUG_GRAPH2;
250						++modules;
251					}
252					break;
253				case 'j':
254					debug |= DEBUG_JOB;
255					break;
256				case 'l':
257					debug |= DEBUG_LOUD;
258					break;
259				case 'm':
260					debug |= DEBUG_MAKE;
261					break;
262				case 's':
263					debug |= DEBUG_SUFF;
264					break;
265				case 't':
266					debug |= DEBUG_TARG;
267					break;
268				case 'v':
269					debug |= DEBUG_VAR;
270					break;
271				default:
272					warnx("illegal argument to d option -- %c", *modules);
273					usage();
274				}
275			MFLAGS_append("-d", optarg);
276			break;
277		}
278		case 'E':
279			p = emalloc(strlen(optarg) + 1);
280			(void)strcpy(p, optarg);
281			(void)Lst_AtEnd(envFirstVars, (void *)p);
282			MFLAGS_append("-E", optarg);
283			break;
284		case 'e':
285			checkEnvFirst = TRUE;
286			MFLAGS_append("-e", NULL);
287			break;
288		case 'f':
289			(void)Lst_AtEnd(makefiles, (void *)optarg);
290			break;
291		case 'i':
292			ignoreErrors = TRUE;
293			MFLAGS_append("-i", NULL);
294			break;
295		case 'j': {
296			char *endptr;
297
298			forceJobs = TRUE;
299			maxJobs = strtol(optarg, &endptr, 10);
300			if (maxJobs <= 0 || *endptr != '\0') {
301				warnx("illegal number, -j argument -- %s",
302				    optarg);
303				usage();
304			}
305#ifndef REMOTE
306			maxLocal = maxJobs;
307#endif
308			MFLAGS_append("-j", optarg);
309			break;
310		}
311		case 'k':
312			keepgoing = TRUE;
313			MFLAGS_append("-k", NULL);
314			break;
315		case 'm':
316			Dir_AddDir(sysIncPath, optarg);
317			MFLAGS_append("-m", optarg);
318			break;
319		case 'n':
320			noExecute = TRUE;
321			MFLAGS_append("-n", NULL);
322			break;
323		case 'q':
324			queryFlag = TRUE;
325			/* Kind of nonsensical, wot? */
326			MFLAGS_append("-q", NULL);
327			break;
328		case 'r':
329			noBuiltins = TRUE;
330			MFLAGS_append("-r", NULL);
331			break;
332		case 's':
333			beSilent = TRUE;
334			MFLAGS_append("-s", NULL);
335			break;
336		case 't':
337			touchFlag = TRUE;
338			MFLAGS_append("-t", NULL);
339			break;
340		case 'v':
341			beVerbose = TRUE;
342			MFLAGS_append("-v", NULL);
343			break;
344		default:
345		case '?':
346			usage();
347		}
348	}
349
350	oldVars = TRUE;
351
352	/*
353	 * See if the rest of the arguments are variable assignments and
354	 * perform them if so. Else take them to be targets and stuff them
355	 * on the end of the "create" list.
356	 */
357	for (argv += optind, argc -= optind; *argv; ++argv, --argc)
358		if (Parse_IsVar(*argv))
359			Parse_DoVar(*argv, VAR_CMD);
360		else {
361			if (!**argv)
362				Punt("illegal (null) argument.");
363			if (**argv == '-') {
364				if ((*argv)[1])
365					optind = 0;     /* -flag... */
366				else
367					optind = 1;     /* - */
368				goto rearg;
369			}
370			(void)Lst_AtEnd(create, (void *)estrdup(*argv));
371		}
372}
373
374/*-
375 * Main_ParseArgLine --
376 *  	Used by the parse module when a .MFLAGS or .MAKEFLAGS target
377 *	is encountered and by main() when reading the .MAKEFLAGS envariable.
378 *	Takes a line of arguments and breaks it into its
379 * 	component words and passes those words and the number of them to the
380 *	MainParseArgs function.
381 *	The line should have all its leading whitespace removed.
382 *
383 * Results:
384 *	None
385 *
386 * Side Effects:
387 *	Only those that come from the various arguments.
388 */
389void
390Main_ParseArgLine(char *line)
391{
392	char **argv;			/* Manufactured argument vector */
393	int argc;			/* Number of arguments in argv */
394
395	if (line == NULL)
396		return;
397	for (; *line == ' '; ++line)
398		continue;
399	if (!*line)
400		return;
401
402	argv = brk_string(line, &argc, TRUE);
403	MainParseArgs(argc, argv);
404}
405
406char *
407chdir_verify_path(char *path, char *obpath)
408{
409	struct stat sb;
410
411	if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
412		if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) {
413			warn("warning: %s", path);
414			return 0;
415		}
416		return obpath;
417	}
418
419	return 0;
420}
421
422static void
423catch_child(int sig __unused)
424{
425}
426
427/*-
428 * main --
429 *	The main function, for obvious reasons. Initializes variables
430 *	and a few modules, then parses the arguments give it in the
431 *	environment and on the command line. Reads the system makefile
432 *	followed by either Makefile, makefile or the file given by the
433 *	-f argument. Sets the .MAKEFLAGS PMake variable based on all the
434 *	flags it has received by then uses either the Make or the Compat
435 *	module to create the initial list of targets.
436 *
437 * Results:
438 *	If -q was given, exits -1 if anything was out-of-date. Else it exits
439 *	0.
440 *
441 * Side Effects:
442 *	The program exits when done. Targets are created. etc. etc. etc.
443 */
444int
445main(int argc, char **argv)
446{
447	Lst targs;	/* target nodes to create -- passed to Make_Init */
448	Boolean outOfDate = TRUE; 	/* FALSE if all targets up to date */
449	struct stat sa;
450	char *p, *p1, *path, *pathp;
451#ifdef WANT_ENV_MKLVL
452#define	MKLVL_MAXVAL	500
453#define	MKLVL_ENVVAR	"__MKLVL__"
454	int iMkLvl = 0;
455	char *szMkLvl = getenv(MKLVL_ENVVAR);
456#endif	/* WANT_ENV_MKLVL */
457	char mdpath[MAXPATHLEN];
458	char obpath[MAXPATHLEN];
459	char cdpath[MAXPATHLEN];
460    	char *machine = getenv("MACHINE");
461	char *machine_arch = getenv("MACHINE_ARCH");
462	char *machine_cpu = getenv("MACHINE_CPU");
463	Lst sysMkPath;			/* Path of sys.mk */
464	char *cp = NULL, *start;
465					/* avoid faults on read-only strings */
466	static char syspath[] = _PATH_DEFSYSPATH;
467
468	{
469	/*
470	 * Catch SIGCHLD so that we get kicked out of select() when we
471	 * need to look at a child.  This is only known to matter for the
472	 * -j case (perhaps without -P).
473	 *
474	 * XXX this is intentionally misplaced.
475	 */
476	struct sigaction sa;
477
478	sigemptyset(&sa.sa_mask);
479	sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
480	sa.sa_handler = catch_child;
481	sigaction(SIGCHLD, &sa, NULL);
482	}
483
484#ifdef WANT_ENV_MKLVL
485	if ((iMkLvl = szMkLvl ? atoi(szMkLvl) : 0) < 0) {
486	  iMkLvl = 0;
487	}
488	if (iMkLvl++ > MKLVL_MAXVAL) {
489	  errc(2, EAGAIN,
490	       "Max recursion level (%d) exceeded.", MKLVL_MAXVAL);
491	}
492	bzero(szMkLvl = emalloc(32), 32);
493	sprintf(szMkLvl, "%d", iMkLvl);
494	setenv(MKLVL_ENVVAR, szMkLvl, 1);
495#endif /* WANT_ENV_MKLVL */
496
497#if DEFSHELL == 2
498	/*
499	 * Turn off ENV to make ksh happier.
500	 */
501	unsetenv("ENV");
502#endif
503
504#ifdef RLIMIT_NOFILE
505	/*
506	 * get rid of resource limit on file descriptors
507	 */
508	{
509		struct rlimit rl;
510		if (getrlimit(RLIMIT_NOFILE, &rl) != -1 &&
511		    rl.rlim_cur != rl.rlim_max) {
512			rl.rlim_cur = rl.rlim_max;
513			(void) setrlimit(RLIMIT_NOFILE, &rl);
514		}
515	}
516#endif
517
518	/*
519	 * PC-98 kernel sets the `i386' string to the utsname.machine and
520	 * it cannot be distinguished from IBM-PC by uname(3).  Therefore,
521	 * we check machine.ispc98 and adjust the machine variable before
522	 * using usname(3) below.
523	 * NOTE: machdep.ispc98 was defined on 1998/8/31. At that time,
524	 * __FreeBSD_version was defined as 300003. So, this check can
525	 * safely be done with any kernel with version > 300003.
526	 */
527	if (!machine) {
528		int	ispc98;
529		size_t	len;
530
531		len = sizeof(ispc98);
532		if (!sysctlbyname("machdep.ispc98", &ispc98, &len, NULL, 0)) {
533			if (ispc98)
534				machine = "pc98";
535		}
536	}
537
538	/*
539	 * Get the name of this type of MACHINE from utsname
540	 * so we can share an executable for similar machines.
541	 * (i.e. m68k: amiga hp300, mac68k, sun3, ...)
542	 *
543	 * Note that while MACHINE is decided at run-time,
544	 * MACHINE_ARCH is always known at compile time.
545	 */
546	if (!machine) {
547#ifndef MACHINE
548	    struct utsname utsname;
549
550	    if (uname(&utsname) == -1)
551		    err(2, "uname");
552	    machine = utsname.machine;
553#else
554	    machine = MACHINE;
555#endif
556	}
557
558	if (!machine_arch) {
559#ifndef MACHINE_ARCH
560		machine_arch = "unknown";
561#else
562		machine_arch = MACHINE_ARCH;
563#endif
564	}
565
566	/*
567	 * Set machine_cpu to the minumum supported CPU revision based
568	 * on the target architecture, if not already set.
569	 */
570	if (!machine_cpu) {
571		if (!strcmp(machine_arch, "i386"))
572			machine_cpu = "i386";
573		else if (!strcmp(machine_arch, "alpha"))
574			machine_cpu = "ev4";
575		else
576			machine_cpu = "unknown";
577	}
578
579	create = Lst_Init(FALSE);
580	makefiles = Lst_Init(FALSE);
581	envFirstVars = Lst_Init(FALSE);
582	expandVars = TRUE;
583	variables = Lst_Init(FALSE);
584	beSilent = FALSE;		/* Print commands as executed */
585	ignoreErrors = FALSE;		/* Pay attention to non-zero returns */
586	noExecute = FALSE;		/* Execute all commands */
587	keepgoing = FALSE;		/* Stop on error */
588	allPrecious = FALSE;		/* Remove targets when interrupted */
589	queryFlag = FALSE;		/* This is not just a check-run */
590	noBuiltins = FALSE;		/* Read the built-in rules */
591	touchFlag = FALSE;		/* Actually update targets */
592	usePipes = TRUE;		/* Catch child output in pipes */
593	debug = 0;			/* No debug verbosity, please. */
594	jobsRunning = FALSE;
595
596	maxLocal = DEFMAXLOCAL;		/* Set default local max concurrency */
597#ifdef REMOTE
598	maxJobs = DEFMAXJOBS;		/* Set default max concurrency */
599#else
600	maxJobs = maxLocal;
601#endif
602	forceJobs = FALSE;              /* No -j flag */
603	compatMake = FALSE;		/* No compat mode */
604
605
606	/*
607	 * Initialize the parsing, directory and variable modules to prepare
608	 * for the reading of inclusion paths and variable settings on the
609	 * command line
610	 */
611	Dir_Init();		/* Initialize directory structures so -I flags
612				 * can be processed correctly */
613	Parse_Init();		/* Need to initialize the paths of #include
614				 * directories */
615	Var_Init();		/* As well as the lists of variables for
616				 * parsing arguments */
617        str_init();
618
619	/*
620	 * Initialize various variables.
621	 *	MAKE also gets this name, for compatibility
622	 *	.MAKEFLAGS gets set to the empty string just in case.
623	 *	MFLAGS also gets initialized empty, for compatibility.
624	 */
625	Var_Set("MAKE", argv[0], VAR_GLOBAL);
626	Var_Set(MAKEFLAGS, "", VAR_GLOBAL);
627	Var_Set("MFLAGS", "", VAR_GLOBAL);
628	Var_Set("MACHINE", machine, VAR_GLOBAL);
629	Var_Set("MACHINE_ARCH", machine_arch, VAR_GLOBAL);
630	Var_Set("MACHINE_CPU", machine_cpu, VAR_GLOBAL);
631#ifdef MAKE_VERSION
632	Var_Set("MAKE_VERSION", MAKE_VERSION, VAR_GLOBAL);
633#endif
634
635	/*
636	 * First snag any flags out of the MAKE environment variable.
637	 * (Note this is *not* MAKEFLAGS since /bin/make uses that and it's
638	 * in a different format).
639	 */
640#ifdef POSIX
641	Main_ParseArgLine(getenv("MAKEFLAGS"));
642#else
643	Main_ParseArgLine(getenv("MAKE"));
644#endif
645
646	MainParseArgs(argc, argv);
647
648#ifdef POSIX
649	Var_AddCmdLine(MAKEFLAGS);
650#endif
651
652	/*
653	 * Find where we are...
654	 * All this code is so that we know where we are when we start up
655	 * on a different machine with pmake.
656	 */
657	curdir = cdpath;
658	if (getcwd(curdir, MAXPATHLEN) == NULL)
659		err(2, NULL);
660
661	if (stat(curdir, &sa) == -1)
662	    err(2, "%s", curdir);
663
664	/*
665	 * The object directory location is determined using the
666	 * following order of preference:
667	 *
668	 *	1. MAKEOBJDIRPREFIX`cwd`
669	 *	2. MAKEOBJDIR
670	 *	3. _PATH_OBJDIR.${MACHINE}
671	 *	4. _PATH_OBJDIR
672	 *	5. _PATH_OBJDIRPREFIX`cwd`
673	 *
674	 * If one of the first two fails, use the current directory.
675	 * If the remaining three all fail, use the current directory.
676	 *
677	 * Once things are initted,
678	 * have to add the original directory to the search path,
679	 * and modify the paths for the Makefiles apropriately.  The
680	 * current directory is also placed as a variable for make scripts.
681	 */
682	if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) {
683		if (!(path = getenv("MAKEOBJDIR"))) {
684			path = _PATH_OBJDIR;
685			pathp = _PATH_OBJDIRPREFIX;
686			(void) snprintf(mdpath, MAXPATHLEN, "%s.%s",
687					path, machine);
688			if (!(objdir = chdir_verify_path(mdpath, obpath)))
689				if (!(objdir=chdir_verify_path(path, obpath))) {
690					(void) snprintf(mdpath, MAXPATHLEN,
691							"%s%s", pathp, curdir);
692					if (!(objdir=chdir_verify_path(mdpath,
693								       obpath)))
694						objdir = curdir;
695				}
696		}
697		else if (!(objdir = chdir_verify_path(path, obpath)))
698			objdir = curdir;
699	}
700	else {
701		(void) snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir);
702		if (!(objdir = chdir_verify_path(mdpath, obpath)))
703			objdir = curdir;
704	}
705	Dir_InitDot();		/* Initialize the "." directory */
706	if (objdir != curdir)
707		Dir_AddDir(dirSearchPath, curdir);
708	Var_Set(".CURDIR", curdir, VAR_GLOBAL);
709	Var_Set(".OBJDIR", objdir, VAR_GLOBAL);
710
711	/*
712	 * Be compatible if user did not specify -j and did not explicitly
713	 * turned compatibility on
714	 */
715	if (!compatMake && !forceJobs)
716		compatMake = TRUE;
717
718	/*
719	 * Initialize archive, target and suffix modules in preparation for
720	 * parsing the makefile(s)
721	 */
722	Arch_Init();
723	Targ_Init();
724	Suff_Init();
725
726	DEFAULT = NULL;
727	(void)time(&now);
728
729	/*
730	 * Set up the .TARGETS variable to contain the list of targets to be
731	 * created. If none specified, make the variable empty -- the parser
732	 * will fill the thing in with the default or .MAIN target.
733	 */
734	if (!Lst_IsEmpty(create)) {
735		LstNode ln;
736
737		for (ln = Lst_First(create); ln != NULL;
738		    ln = Lst_Succ(ln)) {
739			char *name = (char *)Lst_Datum(ln);
740
741			Var_Append(".TARGETS", name, VAR_GLOBAL);
742		}
743	} else
744		Var_Set(".TARGETS", "", VAR_GLOBAL);
745
746
747	/*
748	 * If no user-supplied system path was given (through the -m option)
749	 * add the directories from the DEFSYSPATH (more than one may be given
750	 * as dir1:...:dirn) to the system include path.
751	 */
752	if (Lst_IsEmpty(sysIncPath)) {
753		for (start = syspath; *start != '\0'; start = cp) {
754			for (cp = start; *cp != '\0' && *cp != ':'; cp++)
755				continue;
756			if (*cp == '\0') {
757				Dir_AddDir(sysIncPath, start);
758			} else {
759				*cp++ = '\0';
760				Dir_AddDir(sysIncPath, start);
761			}
762		}
763	}
764
765	/*
766	 * Read in the built-in rules first, followed by the specified
767	 * makefile, if it was (makefile != (char *) NULL), or the default
768	 * Makefile and makefile, in that order, if it wasn't.
769	 */
770	if (!noBuiltins) {
771		LstNode ln;
772
773		sysMkPath = Lst_Init (FALSE);
774		Dir_Expand (_PATH_DEFSYSMK, sysIncPath, sysMkPath);
775		if (Lst_IsEmpty(sysMkPath))
776			Fatal("make: no system rules (%s).", _PATH_DEFSYSMK);
777		ln = Lst_Find(sysMkPath, (void *)NULL, ReadMakefile);
778		if (ln != NULL)
779			Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
780	}
781
782	if (!Lst_IsEmpty(makefiles)) {
783		LstNode ln;
784
785		ln = Lst_Find(makefiles, (void *)NULL, ReadMakefile);
786		if (ln != NULL)
787			Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
788	} else if (!ReadMakefile("BSDmakefile", NULL))
789	    if (!ReadMakefile("makefile", NULL))
790		(void)ReadMakefile("Makefile", NULL);
791
792	(void)ReadMakefile(".depend", NULL);
793
794	/* Install all the flags into the MAKE envariable. */
795	if (((p = Var_Value(MAKEFLAGS, VAR_GLOBAL, &p1)) != NULL) && *p)
796#ifdef POSIX
797		setenv("MAKEFLAGS", p, 1);
798#else
799		setenv("MAKE", p, 1);
800#endif
801	free(p1);
802
803	/*
804	 * For compatibility, look at the directories in the VPATH variable
805	 * and add them to the search path, if the variable is defined. The
806	 * variable's value is in the same format as the PATH envariable, i.e.
807	 * <directory>:<directory>:<directory>...
808	 */
809	if (Var_Exists("VPATH", VAR_CMD)) {
810		char *vpath, savec;
811		/*
812		 * GCC stores string constants in read-only memory, but
813		 * Var_Subst will want to write this thing, so store it
814		 * in an array
815		 */
816		static char VPATH[] = "${VPATH}";
817
818		vpath = Var_Subst(NULL, VPATH, VAR_CMD, FALSE);
819		path = vpath;
820		do {
821			/* skip to end of directory */
822			for (cp = path; *cp != ':' && *cp != '\0'; cp++)
823				continue;
824			/* Save terminator character so know when to stop */
825			savec = *cp;
826			*cp = '\0';
827			/* Add directory to search path */
828			Dir_AddDir(dirSearchPath, path);
829			*cp = savec;
830			path = cp + 1;
831		} while (savec == ':');
832		(void)free(vpath);
833	}
834
835	/*
836	 * Now that all search paths have been read for suffixes et al, it's
837	 * time to add the default search path to their lists...
838	 */
839	Suff_DoPaths();
840
841	/* print the initial graph, if the user requested it */
842	if (DEBUG(GRAPH1))
843		Targ_PrintGraph(1);
844
845	/* print the values of any variables requested by the user */
846	if (!Lst_IsEmpty(variables)) {
847		LstNode ln;
848
849		for (ln = Lst_First(variables); ln != NULL;
850		    ln = Lst_Succ(ln)) {
851			char *value;
852			if (expandVars) {
853				p1 = emalloc(strlen((char *)Lst_Datum(ln)) + 1 + 3);
854				/* This sprintf is safe, because of the malloc above */
855				(void)sprintf(p1, "${%s}", (char *)Lst_Datum(ln));
856				value = Var_Subst(NULL, p1, VAR_GLOBAL, FALSE);
857			} else {
858				value = Var_Value((char *)Lst_Datum(ln),
859						  VAR_GLOBAL, &p1);
860			}
861			printf("%s\n", value ? value : "");
862			if (p1)
863				free(p1);
864		}
865	} else {
866
867		/*
868		 * Have now read the entire graph and need to make a list of targets
869		 * to create. If none was given on the command line, we consult the
870		 * parsing module to find the main target(s) to create.
871		 */
872		if (Lst_IsEmpty(create))
873			targs = Parse_MainName();
874		else
875			targs = Targ_FindList(create, TARG_CREATE);
876
877		if (!compatMake) {
878			/*
879			 * Initialize job module before traversing the graph, now that
880			 * any .BEGIN and .END targets have been read.  This is done
881			 * only if the -q flag wasn't given (to prevent the .BEGIN from
882			 * being executed should it exist).
883			 */
884			if (!queryFlag) {
885				if (maxLocal == -1)
886					maxLocal = maxJobs;
887				Job_Init(maxJobs, maxLocal);
888				jobsRunning = TRUE;
889			}
890
891			/* Traverse the graph, checking on all the targets */
892			outOfDate = Make_Run(targs);
893		} else {
894			/*
895			 * Compat_Init will take care of creating all the targets as
896			 * well as initializing the module.
897			 */
898			Compat_Run(targs);
899			outOfDate = 0;
900		}
901		Lst_Destroy(targs, NOFREE);
902	}
903
904	Lst_Destroy(variables, NOFREE);
905	Lst_Destroy(makefiles, NOFREE);
906	Lst_Destroy(create, (void (*)(void *)) free);
907
908	/* print the graph now it's been processed if the user requested it */
909	if (DEBUG(GRAPH2))
910		Targ_PrintGraph(2);
911
912	Suff_End();
913        Targ_End();
914	Arch_End();
915	str_end();
916	Var_End();
917	Parse_End();
918	Dir_End();
919
920	if (queryFlag && outOfDate)
921		return(1);
922	else
923		return(0);
924}
925
926/*-
927 * ReadMakefile  --
928 *	Open and parse the given makefile.
929 *
930 * Results:
931 *	TRUE if ok. FALSE if couldn't open file.
932 *
933 * Side Effects:
934 *	lots
935 */
936static Boolean
937ReadMakefile(void *p, void *q __unused)
938{
939	char *fname;			/* makefile to read */
940	FILE *stream;
941	char *name, path[MAXPATHLEN];
942	char *MAKEFILE;
943	int setMAKEFILE;
944
945	fname = p;
946
947	if (!strcmp(fname, "-")) {
948		Parse_File("(stdin)", stdin);
949		Var_Set("MAKEFILE", "", VAR_GLOBAL);
950	} else {
951		setMAKEFILE = strcmp(fname, ".depend");
952
953		/* if we've chdir'd, rebuild the path name */
954		if (curdir != objdir && *fname != '/') {
955			(void)snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname);
956			/*
957			 * XXX The realpath stuff breaks relative includes
958			 * XXX in some cases.   The problem likely is in
959			 * XXX parse.c where it does special things in
960			 * XXX ParseDoInclude if the file is relateive
961			 * XXX or absolute and not a system file.  There
962			 * XXX it assumes that if the current file that's
963			 * XXX being included is absolute, that any files
964			 * XXX that it includes shouldn't do the -I path
965			 * XXX stuff, which is inconsistant with historical
966			 * XXX behavior.  However, I can't pentrate the mists
967			 * XXX further, so I'm putting this workaround in
968			 * XXX here until such time as the underlying bug
969			 * XXX can be fixed.
970			 */
971#if THIS_BREAKS_THINGS
972			if (realpath(path, path) != NULL &&
973			    (stream = fopen(path, "r")) != NULL) {
974				MAKEFILE = fname;
975				fname = path;
976				goto found;
977			}
978		} else if (realpath(fname, path) != NULL) {
979			MAKEFILE = fname;
980			fname = path;
981			if ((stream = fopen(fname, "r")) != NULL)
982				goto found;
983		}
984#else
985			if ((stream = fopen(path, "r")) != NULL) {
986				MAKEFILE = fname;
987				fname = path;
988				goto found;
989			}
990		} else {
991			MAKEFILE = fname;
992			if ((stream = fopen(fname, "r")) != NULL)
993				goto found;
994		}
995#endif
996		/* look in -I and system include directories. */
997		name = Dir_FindFile(fname, parseIncPath);
998		if (!name)
999			name = Dir_FindFile(fname, sysIncPath);
1000		if (!name || !(stream = fopen(name, "r")))
1001			return(FALSE);
1002		MAKEFILE = fname = name;
1003		/*
1004		 * set the MAKEFILE variable desired by System V fans -- the
1005		 * placement of the setting here means it gets set to the last
1006		 * makefile specified, as it is set by SysV make.
1007		 */
1008found:
1009		if (setMAKEFILE)
1010			Var_Set("MAKEFILE", MAKEFILE, VAR_GLOBAL);
1011		Parse_File(fname, stream);
1012		(void)fclose(stream);
1013	}
1014	return(TRUE);
1015}
1016
1017/*-
1018 * Cmd_Exec --
1019 *	Execute the command in cmd, and return the output of that command
1020 *	in a string.
1021 *
1022 * Results:
1023 *	A string containing the output of the command, or the empty string
1024 *	If error is not NULL, it contains the reason for the command failure
1025 *
1026 * Side Effects:
1027 *	The string must be freed by the caller.
1028 */
1029char *
1030Cmd_Exec(char *cmd, char **error)
1031{
1032    char	*args[4];   	/* Args for invoking the shell */
1033    int 	fds[2];	    	/* Pipe streams */
1034    int 	cpid;	    	/* Child PID */
1035    int 	pid;	    	/* PID from wait() */
1036    char	*res;		/* result */
1037    int		status;		/* command exit status */
1038    Buffer	buf;		/* buffer to store the result */
1039    char	*cp;
1040    int		cc;
1041
1042    *error = NULL;
1043
1044    /*
1045     * Set up arguments for shell
1046     */
1047    args[0] = "sh";
1048    args[1] = "-c";
1049    args[2] = cmd;
1050    args[3] = NULL;
1051
1052    /*
1053     * Open a pipe for fetching its output
1054     */
1055    if (pipe(fds) == -1) {
1056	*error = "Couldn't create pipe for \"%s\"";
1057	goto bad;
1058    }
1059
1060    /*
1061     * Fork
1062     */
1063    switch (cpid = vfork()) {
1064    case 0:
1065	/*
1066	 * Close input side of pipe
1067	 */
1068	(void) close(fds[0]);
1069
1070	/*
1071	 * Duplicate the output stream to the shell's output, then
1072	 * shut the extra thing down. Note we don't fetch the error
1073	 * stream...why not? Why?
1074	 */
1075	(void) dup2(fds[1], 1);
1076	(void) close(fds[1]);
1077
1078#if defined(DEFSHELL) && DEFSHELL == 0
1079	(void) execv("/bin/csh", args);
1080#elif DEFSHELL == 1
1081	(void) execv("/bin/sh", args);
1082#elif DEFSHELL == 2
1083	(void) execv("/bin/ksh", args);
1084#else
1085#error "DEFSHELL must be 1 or 2."
1086#endif
1087	_exit(1);
1088	/*NOTREACHED*/
1089
1090    case -1:
1091	*error = "Couldn't exec \"%s\"";
1092	goto bad;
1093
1094    default:
1095	/*
1096	 * No need for the writing half
1097	 */
1098	(void) close(fds[1]);
1099
1100	buf = Buf_Init (MAKE_BSIZE);
1101
1102	do {
1103	    char   result[BUFSIZ];
1104	    cc = read(fds[0], result, sizeof(result));
1105	    if (cc > 0)
1106		Buf_AddBytes(buf, cc, (Byte *) result);
1107	}
1108	while (cc > 0 || (cc == -1 && errno == EINTR));
1109
1110	/*
1111	 * Close the input side of the pipe.
1112	 */
1113	(void) close(fds[0]);
1114
1115	/*
1116	 * Wait for the process to exit.
1117	 */
1118	while(((pid = wait(&status)) != cpid) && (pid >= 0))
1119	    continue;
1120
1121	if (cc == -1)
1122	    *error = "Error reading shell's output for \"%s\"";
1123
1124	res = (char *)Buf_GetAll (buf, &cc);
1125	Buf_Destroy (buf, FALSE);
1126
1127	if (status)
1128	    *error = "\"%s\" returned non-zero status";
1129
1130	/*
1131	 * Null-terminate the result, convert newlines to spaces and
1132	 * install it in the variable.
1133	 */
1134	res[cc] = '\0';
1135	cp = &res[cc] - 1;
1136
1137	if (*cp == '\n') {
1138	    /*
1139	     * A final newline is just stripped
1140	     */
1141	    *cp-- = '\0';
1142	}
1143	while (cp >= res) {
1144	    if (*cp == '\n') {
1145		*cp = ' ';
1146	    }
1147	    cp--;
1148	}
1149	break;
1150    }
1151    return res;
1152bad:
1153    res = emalloc(1);
1154    *res = '\0';
1155    return res;
1156}
1157
1158/*
1159 * usage --
1160 *	exit with usage message
1161 */
1162static void
1163usage(void)
1164{
1165	(void)fprintf(stderr, "%s\n%s\n%s\n",
1166"usage: make [-BPSXeiknqrstv] [-C directory] [-D variable] [-d flags]",
1167"            [-E variable] [-f makefile] [-I directory] [-j max_jobs]",
1168"            [-m directory] [-V variable] [variable=value] [target ...]");
1169	exit(2);
1170}
1171