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 1.118 2005/02/13 13:33:56 harti Exp $
41 * $DragonFly: src/usr.bin/make/main.c,v 1.60 2005/03/12 11:29:33 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>
61 #include <sys/sysctl.h>
63 #include <sys/resource.h>
82 #include "pathnames.h"
89 #define WANT_ENV_MKLVL 1
90 #define MKLVL_MAXVAL 500
91 #define MKLVL_ENVVAR "__MKLVL__"
93 #define MAKEFLAGS ".MAKEFLAGS"
95 /* Targets to be made */
96 Lst create = Lst_Initializer(create);
98 time_t now; /* Time at start of make */
99 struct GNode *DEFAULT; /* .DEFAULT node */
100 Boolean allPrecious; /* .PRECIOUS given on line by itself */
102 static Boolean noBuiltins; /* -r flag */
104 /* ordered list of makefiles to read */
105 static Lst makefiles = Lst_Initializer(makefiles);
107 static Boolean expandVars; /* fully expand printed variables */
109 /* list of variables to print */
110 static Lst variables = Lst_Initializer(variables);
112 int maxJobs; /* -j argument */
113 static Boolean forceJobs; /* -j argument given */
114 Boolean compatMake; /* -B argument */
115 Boolean debug; /* -d flag */
116 Boolean noExecute; /* -n flag */
117 Boolean keepgoing; /* -k flag */
118 Boolean queryFlag; /* -q flag */
119 Boolean touchFlag; /* -t flag */
120 Boolean usePipes; /* !-P flag */
121 Boolean ignoreErrors; /* -i flag */
122 Boolean beSilent; /* -s flag */
123 Boolean beVerbose; /* -v flag */
124 Boolean oldVars; /* variable substitution style */
125 Boolean checkEnvFirst; /* -e flag */
127 /* (-E) vars to override from env */
128 Lst envFirstVars = Lst_Initializer(envFirstVars);
130 Boolean jobsRunning; /* TRUE if the jobs might be running */
132 static void MainParseArgs(int, char **);
133 char *chdir_verify_path(const char *, char *);
134 static int ReadMakefile(const void *, const void *);
135 static void usage(void);
137 static char *curdir; /* startup directory */
138 static char *objdir; /* where we chdir'ed to */
141 * Append a flag with an optional argument to MAKEFLAGS and MFLAGS
144 MFLAGS_append(const char *flag, char *arg)
148 Var_Append(MAKEFLAGS, flag, VAR_GLOBAL);
150 str = MAKEFLAGS_quote(arg);
151 Var_Append(MAKEFLAGS, str, VAR_GLOBAL);
155 Var_Append("MFLAGS", flag, VAR_GLOBAL);
157 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);
402 MainParseArgs(argc, argv);
406 chdir_verify_path(const char *path, char *obpath)
410 if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
411 if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) {
412 warn("warning: %s", path);
422 catch_child(int sig __unused)
427 * In lieu of a good way to prevent every possible looping in
428 * make(1), stop there from being more than MKLVL_MAXVAL processes forked
429 * by make(1), to prevent a forkbomb from happening, in a dumb and
433 check_make_level(void)
435 #ifdef WANT_ENV_MKLVL
436 char *value = getenv(MKLVL_ENVVAR);
437 int level = (value == NULL) ? 0 : atoi(value);
440 errc(2, EAGAIN, "Invalid value for recursion level (%d).", level);
441 } else if (level > MKLVL_MAXVAL) {
442 errc(2, EAGAIN, "Max recursion level (%d) exceeded.", MKLVL_MAXVAL);
445 sprintf(new_value, "%d", level + 1);
446 setenv(MKLVL_ENVVAR, new_value, 1);
448 #endif /* WANT_ENV_MKLVL */
453 * The main function, for obvious reasons. Initializes variables
454 * and a few modules, then parses the arguments give it in the
455 * environment and on the command line. Reads the system makefile
456 * followed by either Makefile, makefile or the file given by the
457 * -f argument. Sets the .MAKEFLAGS PMake variable based on all the
458 * flags it has received by then uses either the Make or the Compat
459 * module to create the initial list of targets.
462 * If -q was given, exits -1 if anything was out-of-date. Else it exits
466 * The program exits when done. Targets are created. etc. etc. etc.
469 main(int argc, char **argv)
471 Boolean outOfDate = TRUE; /* FALSE if all targets up to date */
475 char mdpath[MAXPATHLEN];
476 char obpath[MAXPATHLEN];
477 char cdpath[MAXPATHLEN];
478 const char *machine = getenv("MACHINE");
479 const char *machine_arch = getenv("MACHINE_ARCH");
480 const char *machine_cpu = getenv("MACHINE_CPU");
481 char *cp = NULL, *start;
483 /* avoid faults on read-only strings */
484 static char syspath[] = PATH_DEFSYSPATH;
488 * Catch SIGCHLD so that we get kicked out of select() when we
489 * need to look at a child. This is only known to matter for the
490 * -j case (perhaps without -P).
492 * XXX this is intentionally misplaced.
496 sigemptyset(&sa.sa_mask);
497 sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
498 sa.sa_handler = catch_child;
499 sigaction(SIGCHLD, &sa, NULL);
506 * Turn off ENV to make ksh happier.
513 * get rid of resource limit on file descriptors
517 if (getrlimit(RLIMIT_NOFILE, &rl) != -1 &&
518 rl.rlim_cur != rl.rlim_max) {
519 rl.rlim_cur = rl.rlim_max;
520 setrlimit(RLIMIT_NOFILE, &rl);
526 * PC-98 kernel sets the `i386' string to the utsname.machine and
527 * it cannot be distinguished from IBM-PC by uname(3). Therefore,
528 * we check machine.ispc98 and adjust the machine variable before
529 * using usname(3) below.
530 * NOTE: machdep.ispc98 was defined on 1998/8/31. At that time,
531 * __FreeBSD_version was defined as 300003. So, this check can
532 * safely be done with any kernel with version > 300003.
538 len = sizeof(ispc98);
539 if (!sysctlbyname("machdep.ispc98", &ispc98, &len, NULL, 0)) {
546 * Get the name of this type of MACHINE from utsname
547 * so we can share an executable for similar machines.
548 * (i.e. m68k: amiga hp300, mac68k, sun3, ...)
550 * Note that while MACHINE is decided at run-time,
551 * MACHINE_ARCH is always known at compile time.
555 struct utsname utsname;
557 if (uname(&utsname) == -1)
559 machine = utsname.machine;
567 machine_arch = "unknown";
569 machine_arch = MACHINE_ARCH;
574 * Set machine_cpu to the minumum supported CPU revision based
575 * on the target architecture, if not already set.
578 if (!strcmp(machine_arch, "i386"))
579 machine_cpu = "i386";
580 else if (!strcmp(machine_arch, "alpha"))
583 machine_cpu = "unknown";
587 beSilent = FALSE; /* Print commands as executed */
588 ignoreErrors = FALSE; /* Pay attention to non-zero returns */
589 noExecute = FALSE; /* Execute all commands */
590 keepgoing = FALSE; /* Stop on error */
591 allPrecious = FALSE; /* Remove targets when interrupted */
592 queryFlag = FALSE; /* This is not just a check-run */
593 noBuiltins = FALSE; /* Read the built-in rules */
594 touchFlag = FALSE; /* Actually update targets */
595 usePipes = TRUE; /* Catch child output in pipes */
596 debug = 0; /* No debug verbosity, please. */
599 maxJobs = DEFMAXJOBS;
600 forceJobs = FALSE; /* No -j flag */
601 compatMake = FALSE; /* No compat mode */
604 * Initialize the parsing, directory and variable modules to prepare
605 * for the reading of inclusion paths and variable settings on the
608 Dir_Init(); /* Initialize directory structures so -I flags
609 * can be processed correctly */
610 Parse_Init(); /* Need to initialize the paths of #include
612 Var_Init(); /* As well as the lists of variables for
613 * parsing arguments */
617 * Initialize various variables.
618 * MAKE also gets this name, for compatibility
619 * .MAKEFLAGS gets set to the empty string just in case.
620 * MFLAGS also gets initialized empty, for compatibility.
622 Var_Set("MAKE", argv[0], VAR_GLOBAL);
623 Var_Set(MAKEFLAGS, "", VAR_GLOBAL);
624 Var_Set("MFLAGS", "", VAR_GLOBAL);
625 Var_Set("MACHINE", machine, VAR_GLOBAL);
626 Var_Set("MACHINE_ARCH", machine_arch, VAR_GLOBAL);
627 Var_Set("MACHINE_CPU", machine_cpu, VAR_GLOBAL);
629 Var_Set("MAKE_VERSION", MAKE_VERSION, VAR_GLOBAL);
633 * First snag any flags out of the MAKE environment variable.
634 * (Note this is *not* MAKEFLAGS since /bin/make uses that and it's
635 * in a different format).
637 Main_ParseArgLine(getenv("MAKEFLAGS"), 1);
639 MainParseArgs(argc, argv);
642 * Find where we are...
643 * All this code is so that we know where we are when we start up
644 * on a different machine with pmake.
647 if (getcwd(curdir, MAXPATHLEN) == NULL)
653 if (stat(curdir, &sa) == -1)
654 err(2, "%s", curdir);
658 * The object directory location is determined using the
659 * following order of preference:
661 * 1. MAKEOBJDIRPREFIX`cwd`
663 * 3. PATH_OBJDIR.${MACHINE}
665 * 5. PATH_OBJDIRPREFIX`cwd`
667 * If one of the first two fails, use the current directory.
668 * If the remaining three all fail, use the current directory.
670 * Once things are initted,
671 * have to add the original directory to the search path,
672 * and modify the paths for the Makefiles apropriately. The
673 * current directory is also placed as a variable for make scripts.
675 if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) {
676 if (!(path = getenv("MAKEOBJDIR"))) {
678 pathp = PATH_OBJDIRPREFIX;
679 snprintf(mdpath, MAXPATHLEN, "%s.%s",
681 if (!(objdir = chdir_verify_path(mdpath, obpath)))
682 if (!(objdir=chdir_verify_path(path, obpath))) {
683 snprintf(mdpath, MAXPATHLEN,
684 "%s%s", pathp, curdir);
685 if (!(objdir=chdir_verify_path(mdpath,
690 else if (!(objdir = chdir_verify_path(path, obpath)))
694 snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir);
695 if (!(objdir = chdir_verify_path(mdpath, obpath)))
698 Dir_InitDot(); /* Initialize the "." directory */
699 if (objdir != curdir)
700 Dir_AddDir(&dirSearchPath, curdir);
701 Var_Set(".DIRECTIVE_MAKEENV", "YES", VAR_GLOBAL);
702 Var_Set(".CURDIR", curdir, VAR_GLOBAL);
703 Var_Set(".OBJDIR", objdir, VAR_GLOBAL);
705 if (getenv("MAKE_JOBS_FIFO") != NULL)
708 * Be compatible if user did not specify -j and did not explicitly
709 * turned compatibility on
711 if (!compatMake && !forceJobs)
715 * Initialize archive, target and suffix modules in preparation for
716 * parsing the makefile(s)
726 * Set up the .TARGETS variable to contain the list of targets to be
727 * created. If none specified, make the variable empty -- the parser
728 * will fill the thing in with the default or .MAIN target.
730 if (!Lst_IsEmpty(&create)) {
733 for (ln = Lst_First(&create); ln != NULL; ln = Lst_Succ(ln)) {
734 char *name = Lst_Datum(ln);
736 Var_Append(".TARGETS", name, VAR_GLOBAL);
739 Var_Set(".TARGETS", "", VAR_GLOBAL);
743 * If no user-supplied system path was given (through the -m option)
744 * add the directories from the DEFSYSPATH (more than one may be given
745 * as dir1:...:dirn) to the system include path.
747 if (Lst_IsEmpty(&sysIncPath)) {
748 for (start = syspath; *start != '\0'; start = cp) {
749 for (cp = start; *cp != '\0' && *cp != ':'; cp++)
752 Dir_AddDir(&sysIncPath, start);
755 Dir_AddDir(&sysIncPath, start);
761 * Read in the built-in rules first, followed by the specified
762 * makefile, if it was (makefile != (char *) NULL), or the default
763 * Makefile and makefile, in that order, if it wasn't.
767 Lst sysMkPath = Lst_Initializer(sysMkPath);
770 Dir_Expand(PATH_DEFSYSMK, &sysIncPath, &sysMkPath);
771 if (Lst_IsEmpty(&sysMkPath))
772 Fatal("make: no system rules (%s).", PATH_DEFSYSMK);
773 ln = Lst_Find(&sysMkPath, NULL, ReadMakefile);
775 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
776 Lst_Destroy(&sysMkPath, free);
779 if (!Lst_IsEmpty(&makefiles)) {
782 ln = Lst_Find(&makefiles, NULL, ReadMakefile);
784 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
785 } else if (!ReadMakefile("BSDmakefile", NULL))
786 if (!ReadMakefile("makefile", NULL))
787 ReadMakefile("Makefile", NULL);
789 ReadMakefile(".depend", NULL);
791 /* Install all the flags into the MAKE envariable. */
792 if (((p = Var_Value(MAKEFLAGS, VAR_GLOBAL, &p1)) != NULL) && *p)
793 setenv("MAKEFLAGS", p, 1);
797 * For compatibility, look at the directories in the VPATH variable
798 * and add them to the search path, if the variable is defined. The
799 * variable's value is in the same format as the PATH envariable, i.e.
800 * <directory>:<directory>:<directory>...
802 if (Var_Exists("VPATH", VAR_CMD)) {
804 * GCC stores string constants in read-only memory, but
805 * Var_Subst will want to write this thing, so store it
808 static char VPATH[] = "${VPATH}";
814 buf = Var_Subst(NULL, VPATH, VAR_CMD, FALSE);
816 vpath = Buf_GetAll(buf, NULL);
818 /* skip to end of directory */
819 for (ptr = vpath; *ptr != ':' && *ptr != '\0'; ptr++)
822 /* Save terminator character so know when to stop */
826 /* Add directory to search path */
827 Dir_AddDir(&dirSearchPath, vpath);
830 } while (savec != '\0');
832 Buf_Destroy(buf, TRUE);
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...
841 /* print the initial graph, if the user requested it */
845 /* print the values of any variables requested by the user */
846 if (Lst_IsEmpty(&variables)) {
848 * Since the user has not requested that any variables
849 * be printed, we can build targets.
851 * Have read the entire graph and need to make a list of targets
852 * to create. If none was given on the command line, we consult
853 * the parsing module to find the main target(s) to create.
855 Lst targs = Lst_Initializer(targs);
857 if (Lst_IsEmpty(&create))
858 Parse_MainName(&targs);
860 Targ_FindList(&targs, &create, TARG_CREATE);
864 * Compat_Init will take care of creating
865 * all the targets as well as initializing
872 * Initialize job module before traversing
873 * the graph, now that any .BEGIN and .END
874 * targets have been read. This is done
875 * only if the -q flag wasn't given (to
876 * prevent the .BEGIN from being executed
884 /* Traverse the graph, checking on all the targets */
885 outOfDate = Make_Run(&targs);
887 Lst_Destroy(&targs, NOFREE);
891 * Print the values of any variables requested by
896 LST_FOREACH(n, &variables) {
897 const char *name = Lst_Datum(n);
902 v = emalloc(strlen(name) + 1 + 3);
903 sprintf(v, "${%s}", name);
905 value = Buf_Peel(Var_Subst(NULL, v,
907 printf("%s\n", value);
914 value = Var_Value(name, VAR_GLOBAL, &v);
915 printf("%s\n", value != NULL ? value : "");
922 Lst_Destroy(&variables, free);
923 Lst_Destroy(&makefiles, free);
924 Lst_Destroy(&create, free);
926 /* print the graph now it's been processed if the user requested it */
930 if (queryFlag && outOfDate)
938 * Open and parse the given makefile.
941 * TRUE if ok. FALSE if couldn't open file.
947 ReadMakefile(const void *p, const void *q __unused)
949 char *fname; /* makefile to read */
951 char *name, path[MAXPATHLEN];
955 /* XXX - remove this once constification is done */
958 if (!strcmp(fname, "-")) {
959 Parse_File("(stdin)", stdin);
960 Var_Set("MAKEFILE", "", VAR_GLOBAL);
962 setMAKEFILE = strcmp(fname, ".depend");
964 /* if we've chdir'd, rebuild the path name */
965 if (curdir != objdir && *fname != '/') {
966 snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname);
968 * XXX The realpath stuff breaks relative includes
969 * XXX in some cases. The problem likely is in
970 * XXX parse.c where it does special things in
971 * XXX ParseDoInclude if the file is relateive
972 * XXX or absolute and not a system file. There
973 * XXX it assumes that if the current file that's
974 * XXX being included is absolute, that any files
975 * XXX that it includes shouldn't do the -I path
976 * XXX stuff, which is inconsistant with historical
977 * XXX behavior. However, I can't pentrate the mists
978 * XXX further, so I'm putting this workaround in
979 * XXX here until such time as the underlying bug
982 #if THIS_BREAKS_THINGS
983 if (realpath(path, path) != NULL &&
984 (stream = fopen(path, "r")) != NULL) {
989 } else if (realpath(fname, path) != NULL) {
992 if ((stream = fopen(fname, "r")) != NULL)
996 if ((stream = fopen(path, "r")) != NULL) {
1003 if ((stream = fopen(fname, "r")) != NULL)
1007 /* look in -I and system include directories. */
1008 name = Dir_FindFile(fname, &parseIncPath);
1010 name = Dir_FindFile(fname, &sysIncPath);
1011 if (!name || !(stream = fopen(name, "r")))
1013 MAKEFILE = fname = name;
1015 * set the MAKEFILE variable desired by System V fans -- the
1016 * placement of the setting here means it gets set to the last
1017 * makefile specified, as it is set by SysV make.
1021 Var_Set("MAKEFILE", MAKEFILE, VAR_GLOBAL);
1022 Parse_File(fname, stream);
1030 * Execute the command in cmd, and return the output of that command
1034 * A string containing the output of the command, or the empty string
1035 * If error is not NULL, it contains the reason for the command failure
1038 * The string must be freed by the caller.
1041 Cmd_Exec(const char *cmd, const char **error)
1043 int fds[2]; /* Pipe streams */
1044 int cpid; /* Child PID */
1045 int pid; /* PID from wait() */
1046 int status; /* command exit status */
1047 Buffer *buf; /* buffer to store the result */
1053 if (shellPath == NULL)
1056 * Open a pipe for fetching its output
1058 if (pipe(fds) == -1) {
1059 *error = "Couldn't create pipe for \"%s\"";
1066 switch (cpid = vfork()) {
1069 * Close input side of pipe
1074 * Duplicate the output stream to the shell's output, then
1075 * shut the extra thing down. Note we don't fetch the error
1076 * stream...why not? Why?
1084 /* Set up arguments for shell */
1085 args[0] = shellName;
1090 execv(shellPath, args);
1096 *error = "Couldn't exec \"%s\"";
1101 * No need for the writing half
1106 char result[BUFSIZ];
1107 rcnt = read(fds[0], result, sizeof(result));
1109 Buf_AddBytes(buf, (size_t)rcnt, (Byte *)result);
1110 } while (rcnt > 0 || (rcnt == -1 && errno == EINTR));
1113 *error = "Error reading shell's output for \"%s\"";
1116 * Close the input side of the pipe.
1121 * Wait for the process to exit.
1123 while (((pid = wait(&status)) != cpid) && (pid >= 0))
1127 *error = "\"%s\" returned non-zero status";
1129 Buf_StripNewlines(buf);
1138 * exit with usage message
1143 fprintf(stderr, "%s\n%s\n%s\n",
1144 "usage: make [-BPSXeiknqrstv] [-C directory] [-D variable] [-d flags]",
1145 " [-E variable] [-f makefile] [-I directory] [-j max_jobs]",
1146 " [-m directory] [-V variable] [variable=value] [target ...]");