main.c revision 141799
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 141799 2005-02-13 13:33:56Z 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#ifndef MACHINE 64#include <sys/utsname.h> 65#endif 66#include <sys/param.h> 67#include <sys/stat.h> 68#include <sys/sysctl.h> 69#include <sys/time.h> 70#include <sys/resource.h> 71#include <sys/wait.h> 72#include <err.h> 73#include <errno.h> 74#include <signal.h> 75#include <stdlib.h> 76#include <string.h> 77#include <unistd.h> 78 79#include "arch.h" 80#include "buf.h" 81#include "compat.h" 82#include "config.h" 83#include "dir.h" 84#include "globals.h" 85#include "job.h" 86#include "make.h" 87#include "nonints.h" 88#include "parse.h" 89#include "pathnames.h" 90#include "str.h" 91#include "suff.h" 92#include "targ.h" 93#include "util.h" 94#include "var.h" 95 96#define WANT_ENV_MKLVL 1 97#define MKLVL_MAXVAL 500 98#define MKLVL_ENVVAR "__MKLVL__" 99 100#define MAKEFLAGS ".MAKEFLAGS" 101 102/* Targets to be made */ 103Lst create = Lst_Initializer(create); 104 105time_t now; /* Time at start of make */ 106struct GNode *DEFAULT; /* .DEFAULT node */ 107Boolean allPrecious; /* .PRECIOUS given on line by itself */ 108 109static Boolean noBuiltins; /* -r flag */ 110 111/* ordered list of makefiles to read */ 112static Lst makefiles = Lst_Initializer(makefiles); 113 114static Boolean expandVars; /* fully expand printed variables */ 115 116/* list of variables to print */ 117static Lst variables = Lst_Initializer(variables); 118 119int maxJobs; /* -j argument */ 120static Boolean forceJobs; /* -j argument given */ 121Boolean compatMake; /* -B argument */ 122Boolean debug; /* -d flag */ 123Boolean noExecute; /* -n flag */ 124Boolean keepgoing; /* -k flag */ 125Boolean queryFlag; /* -q flag */ 126Boolean touchFlag; /* -t flag */ 127Boolean usePipes; /* !-P flag */ 128Boolean ignoreErrors; /* -i flag */ 129Boolean beSilent; /* -s flag */ 130Boolean beVerbose; /* -v flag */ 131Boolean oldVars; /* variable substitution style */ 132Boolean checkEnvFirst; /* -e flag */ 133 134/* (-E) vars to override from env */ 135Lst envFirstVars = Lst_Initializer(envFirstVars); 136 137Boolean jobsRunning; /* TRUE if the jobs might be running */ 138 139static void MainParseArgs(int, char **); 140char *chdir_verify_path(const char *, char *); 141static int ReadMakefile(const void *, const void *); 142static void usage(void); 143 144static char *curdir; /* startup directory */ 145static char *objdir; /* where we chdir'ed to */ 146 147/* 148 * Append a flag with an optional argument to MAKEFLAGS and MFLAGS 149 */ 150static void 151MFLAGS_append(const char *flag, char *arg) 152{ 153 char *str; 154 155 Var_Append(MAKEFLAGS, flag, VAR_GLOBAL); 156 if (arg != NULL) { 157 str = MAKEFLAGS_quote(arg); 158 Var_Append(MAKEFLAGS, str, VAR_GLOBAL); 159 free(str); 160 } 161 162 Var_Append("MFLAGS", flag, VAR_GLOBAL); 163 if (arg != NULL) { 164 str = MAKEFLAGS_quote(arg); 165 Var_Append("MFLAGS", str, VAR_GLOBAL); 166 free(str); 167 } 168} 169 170/*- 171 * MainParseArgs -- 172 * Parse a given argument vector. Called from main() and from 173 * Main_ParseArgLine() when the .MAKEFLAGS target is used. 174 * 175 * XXX: Deal with command line overriding .MAKEFLAGS in makefile 176 * 177 * Results: 178 * None 179 * 180 * Side Effects: 181 * Various global and local flags will be set depending on the flags 182 * given 183 */ 184static void 185MainParseArgs(int argc, char **argv) 186{ 187 int c; 188 189 optind = 1; /* since we're called more than once */ 190#define OPTFLAGS "BC:D:E:I:PSV:Xd:ef:ij:km:nqrstv" 191rearg: while((c = getopt(argc, argv, OPTFLAGS)) != -1) { 192 switch(c) { 193 case 'C': 194 if (chdir(optarg) == -1) 195 err(1, "chdir %s", optarg); 196 break; 197 case 'D': 198 Var_Set(optarg, "1", VAR_GLOBAL); 199 MFLAGS_append("-D", optarg); 200 break; 201 case 'I': 202 Parse_AddIncludeDir(optarg); 203 MFLAGS_append("-I", optarg); 204 break; 205 case 'V': 206 Lst_AtEnd(&variables, estrdup(optarg)); 207 MFLAGS_append("-V", optarg); 208 break; 209 case 'X': 210 expandVars = FALSE; 211 break; 212 case 'B': 213 compatMake = TRUE; 214 MFLAGS_append("-B", NULL); 215 unsetenv("MAKE_JOBS_FIFO"); 216 break; 217 case 'P': 218 usePipes = FALSE; 219 MFLAGS_append("-P", NULL); 220 break; 221 case 'S': 222 keepgoing = FALSE; 223 MFLAGS_append("-S", NULL); 224 break; 225 case 'd': { 226 char *modules = optarg; 227 228 for (; *modules; ++modules) 229 switch (*modules) { 230 case 'A': 231 debug = ~0; 232 break; 233 case 'a': 234 debug |= DEBUG_ARCH; 235 break; 236 case 'c': 237 debug |= DEBUG_COND; 238 break; 239 case 'd': 240 debug |= DEBUG_DIR; 241 break; 242 case 'f': 243 debug |= DEBUG_FOR; 244 break; 245 case 'g': 246 if (modules[1] == '1') { 247 debug |= DEBUG_GRAPH1; 248 ++modules; 249 } 250 else if (modules[1] == '2') { 251 debug |= DEBUG_GRAPH2; 252 ++modules; 253 } 254 break; 255 case 'j': 256 debug |= DEBUG_JOB; 257 break; 258 case 'l': 259 debug |= DEBUG_LOUD; 260 break; 261 case 'm': 262 debug |= DEBUG_MAKE; 263 break; 264 case 's': 265 debug |= DEBUG_SUFF; 266 break; 267 case 't': 268 debug |= DEBUG_TARG; 269 break; 270 case 'v': 271 debug |= DEBUG_VAR; 272 break; 273 default: 274 warnx("illegal argument to d option -- %c", *modules); 275 usage(); 276 } 277 MFLAGS_append("-d", optarg); 278 break; 279 } 280 case 'E': 281 Lst_AtEnd(&envFirstVars, estrdup(optarg)); 282 MFLAGS_append("-E", optarg); 283 break; 284 case 'e': 285 checkEnvFirst = TRUE; 286 MFLAGS_append("-e", NULL); 287 break; 288 case 'f': 289 Lst_AtEnd(&makefiles, estrdup(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 MFLAGS_append("-j", optarg); 306 break; 307 } 308 case 'k': 309 keepgoing = TRUE; 310 MFLAGS_append("-k", NULL); 311 break; 312 case 'm': 313 Dir_AddDir(&sysIncPath, optarg); 314 MFLAGS_append("-m", optarg); 315 break; 316 case 'n': 317 noExecute = TRUE; 318 MFLAGS_append("-n", NULL); 319 break; 320 case 'q': 321 queryFlag = TRUE; 322 /* Kind of nonsensical, wot? */ 323 MFLAGS_append("-q", NULL); 324 break; 325 case 'r': 326 noBuiltins = TRUE; 327 MFLAGS_append("-r", NULL); 328 break; 329 case 's': 330 beSilent = TRUE; 331 MFLAGS_append("-s", NULL); 332 break; 333 case 't': 334 touchFlag = TRUE; 335 MFLAGS_append("-t", NULL); 336 break; 337 case 'v': 338 beVerbose = TRUE; 339 MFLAGS_append("-v", NULL); 340 break; 341 default: 342 case '?': 343 usage(); 344 } 345 } 346 347 oldVars = TRUE; 348 349 /* 350 * See if the rest of the arguments are variable assignments and 351 * perform them if so. Else take them to be targets and stuff them 352 * on the end of the "create" list. 353 */ 354 for (argv += optind, argc -= optind; *argv; ++argv, --argc) 355 if (Parse_IsVar(*argv)) { 356 char *ptr = MAKEFLAGS_quote(*argv); 357 358 Var_Append(MAKEFLAGS, ptr, VAR_GLOBAL); 359 free(ptr); 360 361 Parse_DoVar(*argv, VAR_CMD); 362 } else { 363 if (!**argv) 364 Punt("illegal (null) argument."); 365 if (**argv == '-') { 366 if ((*argv)[1]) 367 optind = 0; /* -flag... */ 368 else 369 optind = 1; /* - */ 370 goto rearg; 371 } 372 Lst_AtEnd(&create, estrdup(*argv)); 373 } 374} 375 376/*- 377 * Main_ParseArgLine -- 378 * Used by the parse module when a .MFLAGS or .MAKEFLAGS target 379 * is encountered and by main() when reading the .MAKEFLAGS envariable. 380 * Takes a line of arguments and breaks it into its 381 * component words and passes those words and the number of them to the 382 * MainParseArgs function. 383 * The line should have all its leading whitespace removed. 384 * 385 * Results: 386 * None 387 * 388 * Side Effects: 389 * Only those that come from the various arguments. 390 */ 391void 392Main_ParseArgLine(char *line, int mflags) 393{ 394 char **argv; /* Manufactured argument vector */ 395 int argc; /* Number of arguments in argv */ 396 397 if (line == NULL) 398 return; 399 for (; *line == ' '; ++line) 400 continue; 401 if (!*line) 402 return; 403 404 if (mflags) 405 argv = MAKEFLAGS_break(line, &argc); 406 else 407 argv = brk_string(line, &argc, TRUE); 408 409 MainParseArgs(argc, argv); 410} 411 412char * 413chdir_verify_path(const char *path, char *obpath) 414{ 415 struct stat sb; 416 417 if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) { 418 if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) { 419 warn("warning: %s", path); 420 return (NULL); 421 } 422 return (obpath); 423 } 424 425 return (NULL); 426} 427 428static void 429catch_child(int sig __unused) 430{ 431} 432 433/* 434 * In lieu of a good way to prevent every possible looping in 435 * make(1), stop there from being more than MKLVL_MAXVAL processes forked 436 * by make(1), to prevent a forkbomb from happening, in a dumb and 437 * mechanical way. 438 */ 439static void 440check_make_level(void) 441{ 442#ifdef WANT_ENV_MKLVL 443 char *value = getenv(MKLVL_ENVVAR); 444 int level = (value == NULL) ? 0 : atoi(value); 445 446 if (level < 0) { 447 errc(2, EAGAIN, "Invalid value for recursion level (%d).", level); 448 } else if (level > MKLVL_MAXVAL) { 449 errc(2, EAGAIN, "Max recursion level (%d) exceeded.", MKLVL_MAXVAL); 450 } else { 451 char new_value[32]; 452 sprintf(new_value, "%d", level + 1); 453 setenv(MKLVL_ENVVAR, new_value, 1); 454 } 455#endif /* WANT_ENV_MKLVL */ 456} 457 458/*- 459 * main -- 460 * The main function, for obvious reasons. Initializes variables 461 * and a few modules, then parses the arguments give it in the 462 * environment and on the command line. Reads the system makefile 463 * followed by either Makefile, makefile or the file given by the 464 * -f argument. Sets the .MAKEFLAGS PMake variable based on all the 465 * flags it has received by then uses either the Make or the Compat 466 * module to create the initial list of targets. 467 * 468 * Results: 469 * If -q was given, exits -1 if anything was out-of-date. Else it exits 470 * 0. 471 * 472 * Side Effects: 473 * The program exits when done. Targets are created. etc. etc. etc. 474 */ 475int 476main(int argc, char **argv) 477{ 478 Boolean outOfDate = TRUE; /* FALSE if all targets up to date */ 479 char *p, *p1, *pathp; 480 char *path; 481 char mdpath[MAXPATHLEN]; 482 char obpath[MAXPATHLEN]; 483 char cdpath[MAXPATHLEN]; 484 const char *machine = getenv("MACHINE"); 485 const char *machine_arch = getenv("MACHINE_ARCH"); 486 const char *machine_cpu = getenv("MACHINE_CPU"); 487 char *cp = NULL, *start; 488 489 /* avoid faults on read-only strings */ 490 static char syspath[] = _PATH_DEFSYSPATH; 491 492 { 493 /* 494 * Catch SIGCHLD so that we get kicked out of select() when we 495 * need to look at a child. This is only known to matter for the 496 * -j case (perhaps without -P). 497 * 498 * XXX this is intentionally misplaced. 499 */ 500 struct sigaction sa; 501 502 sigemptyset(&sa.sa_mask); 503 sa.sa_flags = SA_RESTART | SA_NOCLDSTOP; 504 sa.sa_handler = catch_child; 505 sigaction(SIGCHLD, &sa, NULL); 506 } 507 508 check_make_level(); 509 510#if DEFSHELL == 2 511 /* 512 * Turn off ENV to make ksh happier. 513 */ 514 unsetenv("ENV"); 515#endif 516 517#ifdef RLIMIT_NOFILE 518 /* 519 * get rid of resource limit on file descriptors 520 */ 521 { 522 struct rlimit rl; 523 if (getrlimit(RLIMIT_NOFILE, &rl) != -1 && 524 rl.rlim_cur != rl.rlim_max) { 525 rl.rlim_cur = rl.rlim_max; 526 setrlimit(RLIMIT_NOFILE, &rl); 527 } 528 } 529#endif 530 531 /* 532 * PC-98 kernel sets the `i386' string to the utsname.machine and 533 * it cannot be distinguished from IBM-PC by uname(3). Therefore, 534 * we check machine.ispc98 and adjust the machine variable before 535 * using usname(3) below. 536 * NOTE: machdep.ispc98 was defined on 1998/8/31. At that time, 537 * __FreeBSD_version was defined as 300003. So, this check can 538 * safely be done with any kernel with version > 300003. 539 */ 540 if (!machine) { 541 int ispc98; 542 size_t len; 543 544 len = sizeof(ispc98); 545 if (!sysctlbyname("machdep.ispc98", &ispc98, &len, NULL, 0)) { 546 if (ispc98) 547 machine = "pc98"; 548 } 549 } 550 551 /* 552 * Get the name of this type of MACHINE from utsname 553 * so we can share an executable for similar machines. 554 * (i.e. m68k: amiga hp300, mac68k, sun3, ...) 555 * 556 * Note that while MACHINE is decided at run-time, 557 * MACHINE_ARCH is always known at compile time. 558 */ 559 if (!machine) { 560#ifndef MACHINE 561 struct utsname utsname; 562 563 if (uname(&utsname) == -1) 564 err(2, "uname"); 565 machine = utsname.machine; 566#else 567 machine = MACHINE; 568#endif 569 } 570 571 if (!machine_arch) { 572#ifndef MACHINE_ARCH 573 machine_arch = "unknown"; 574#else 575 machine_arch = MACHINE_ARCH; 576#endif 577 } 578 579 /* 580 * Set machine_cpu to the minumum supported CPU revision based 581 * on the target architecture, if not already set. 582 */ 583 if (!machine_cpu) { 584 if (!strcmp(machine_arch, "i386")) 585 machine_cpu = "i386"; 586 else if (!strcmp(machine_arch, "alpha")) 587 machine_cpu = "ev4"; 588 else 589 machine_cpu = "unknown"; 590 } 591 592 expandVars = TRUE; 593 beSilent = FALSE; /* Print commands as executed */ 594 ignoreErrors = FALSE; /* Pay attention to non-zero returns */ 595 noExecute = FALSE; /* Execute all commands */ 596 keepgoing = FALSE; /* Stop on error */ 597 allPrecious = FALSE; /* Remove targets when interrupted */ 598 queryFlag = FALSE; /* This is not just a check-run */ 599 noBuiltins = FALSE; /* Read the built-in rules */ 600 touchFlag = FALSE; /* Actually update targets */ 601 usePipes = TRUE; /* Catch child output in pipes */ 602 debug = 0; /* No debug verbosity, please. */ 603 jobsRunning = FALSE; 604 605 maxJobs = DEFMAXJOBS; 606 forceJobs = FALSE; /* No -j flag */ 607 compatMake = FALSE; /* No compat mode */ 608 609 /* 610 * Initialize the parsing, directory and variable modules to prepare 611 * for the reading of inclusion paths and variable settings on the 612 * command line 613 */ 614 Dir_Init(); /* Initialize directory structures so -I flags 615 * can be processed correctly */ 616 Parse_Init(); /* Need to initialize the paths of #include 617 * directories */ 618 Var_Init(); /* As well as the lists of variables for 619 * parsing arguments */ 620 str_init(); 621 622 /* 623 * Initialize various variables. 624 * MAKE also gets this name, for compatibility 625 * .MAKEFLAGS gets set to the empty string just in case. 626 * MFLAGS also gets initialized empty, for compatibility. 627 */ 628 Var_Set("MAKE", argv[0], VAR_GLOBAL); 629 Var_Set(MAKEFLAGS, "", VAR_GLOBAL); 630 Var_Set("MFLAGS", "", VAR_GLOBAL); 631 Var_Set("MACHINE", machine, VAR_GLOBAL); 632 Var_Set("MACHINE_ARCH", machine_arch, VAR_GLOBAL); 633 Var_Set("MACHINE_CPU", machine_cpu, VAR_GLOBAL); 634#ifdef MAKE_VERSION 635 Var_Set("MAKE_VERSION", MAKE_VERSION, VAR_GLOBAL); 636#endif 637 638 /* 639 * First snag any flags out of the MAKE environment variable. 640 * (Note this is *not* MAKEFLAGS since /bin/make uses that and it's 641 * in a different format). 642 */ 643 Main_ParseArgLine(getenv("MAKEFLAGS"), 1); 644 645 MainParseArgs(argc, argv); 646 647 /* 648 * Find where we are... 649 * All this code is so that we know where we are when we start up 650 * on a different machine with pmake. 651 */ 652 curdir = cdpath; 653 if (getcwd(curdir, MAXPATHLEN) == NULL) 654 err(2, NULL); 655 656 { 657 struct stat sa; 658 659 if (stat(curdir, &sa) == -1) 660 err(2, "%s", curdir); 661 } 662 663 /* 664 * The object directory location is determined using the 665 * following order of preference: 666 * 667 * 1. MAKEOBJDIRPREFIX`cwd` 668 * 2. MAKEOBJDIR 669 * 3. _PATH_OBJDIR.${MACHINE} 670 * 4. _PATH_OBJDIR 671 * 5. _PATH_OBJDIRPREFIX`cwd` 672 * 673 * If one of the first two fails, use the current directory. 674 * If the remaining three all fail, use the current directory. 675 * 676 * Once things are initted, 677 * have to add the original directory to the search path, 678 * and modify the paths for the Makefiles apropriately. The 679 * current directory is also placed as a variable for make scripts. 680 */ 681 if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) { 682 if (!(path = getenv("MAKEOBJDIR"))) { 683 path = _PATH_OBJDIR; 684 pathp = _PATH_OBJDIRPREFIX; 685 snprintf(mdpath, MAXPATHLEN, "%s.%s", 686 path, machine); 687 if (!(objdir = chdir_verify_path(mdpath, obpath))) 688 if (!(objdir=chdir_verify_path(path, obpath))) { 689 snprintf(mdpath, MAXPATHLEN, 690 "%s%s", pathp, curdir); 691 if (!(objdir=chdir_verify_path(mdpath, 692 obpath))) 693 objdir = curdir; 694 } 695 } 696 else if (!(objdir = chdir_verify_path(path, obpath))) 697 objdir = curdir; 698 } 699 else { 700 snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir); 701 if (!(objdir = chdir_verify_path(mdpath, obpath))) 702 objdir = curdir; 703 } 704 Dir_InitDot(); /* Initialize the "." directory */ 705 if (objdir != curdir) 706 Dir_AddDir(&dirSearchPath, curdir); 707 Var_Set(".CURDIR", curdir, VAR_GLOBAL); 708 Var_Set(".OBJDIR", objdir, VAR_GLOBAL); 709 710 if (getenv("MAKE_JOBS_FIFO") != NULL) 711 forceJobs = TRUE; 712 /* 713 * Be compatible if user did not specify -j and did not explicitly 714 * turned compatibility on 715 */ 716 if (!compatMake && !forceJobs) 717 compatMake = TRUE; 718 719 /* 720 * Initialize archive, target and suffix modules in preparation for 721 * parsing the makefile(s) 722 */ 723 Arch_Init(); 724 Targ_Init(); 725 Suff_Init(); 726 727 DEFAULT = NULL; 728 time(&now); 729 730 /* 731 * Set up the .TARGETS variable to contain the list of targets to be 732 * created. If none specified, make the variable empty -- the parser 733 * will fill the thing in with the default or .MAIN target. 734 */ 735 if (!Lst_IsEmpty(&create)) { 736 LstNode *ln; 737 738 for (ln = Lst_First(&create); ln != NULL; ln = Lst_Succ(ln)) { 739 char *name = 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 /* Path of sys.mk */ 772 Lst sysMkPath = Lst_Initializer(sysMkPath); 773 LstNode *ln; 774 775 Dir_Expand(_PATH_DEFSYSMK, &sysIncPath, &sysMkPath); 776 if (Lst_IsEmpty(&sysMkPath)) 777 Fatal("make: no system rules (%s).", _PATH_DEFSYSMK); 778 ln = Lst_Find(&sysMkPath, NULL, ReadMakefile); 779 if (ln != NULL) 780 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln)); 781 Lst_Destroy(&sysMkPath, free); 782 } 783 784 if (!Lst_IsEmpty(&makefiles)) { 785 LstNode *ln; 786 787 ln = Lst_Find(&makefiles, NULL, ReadMakefile); 788 if (ln != NULL) 789 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln)); 790 } else if (!ReadMakefile("BSDmakefile", NULL)) 791 if (!ReadMakefile("makefile", NULL)) 792 ReadMakefile("Makefile", NULL); 793 794 ReadMakefile(".depend", NULL); 795 796 /* Install all the flags into the MAKE envariable. */ 797 if (((p = Var_Value(MAKEFLAGS, VAR_GLOBAL, &p1)) != NULL) && *p) 798 setenv("MAKEFLAGS", p, 1); 799 free(p1); 800 801 /* 802 * For compatibility, look at the directories in the VPATH variable 803 * and add them to the search path, if the variable is defined. The 804 * variable's value is in the same format as the PATH envariable, i.e. 805 * <directory>:<directory>:<directory>... 806 */ 807 if (Var_Exists("VPATH", VAR_CMD)) { 808 char *vpath, savec; 809 /* 810 * GCC stores string constants in read-only memory, but 811 * Var_Subst will want to write this thing, so store it 812 * in an array 813 */ 814 static char VPATH[] = "${VPATH}"; 815 816 vpath = Var_Subst(NULL, VPATH, VAR_CMD, FALSE); 817 path = vpath; 818 do { 819 /* skip to end of directory */ 820 for (cp = path; *cp != ':' && *cp != '\0'; cp++) 821 continue; 822 /* Save terminator character so know when to stop */ 823 savec = *cp; 824 *cp = '\0'; 825 /* Add directory to search path */ 826 Dir_AddDir(&dirSearchPath, path); 827 *cp = savec; 828 path = cp + 1; 829 } while (savec == ':'); 830 free(vpath); 831 } 832 833 /* 834 * Now that all search paths have been read for suffixes et al, it's 835 * time to add the default search path to their lists... 836 */ 837 Suff_DoPaths(); 838 839 /* print the initial graph, if the user requested it */ 840 if (DEBUG(GRAPH1)) 841 Targ_PrintGraph(1); 842 843 /* print the values of any variables requested by the user */ 844 if (!Lst_IsEmpty(&variables)) { 845 LstNode *ln; 846 847 for (ln = Lst_First(&variables); ln != NULL; 848 ln = Lst_Succ(ln)) { 849 char *value; 850 if (expandVars) { 851 p1 = emalloc(strlen(Lst_Datum(ln)) + 1 + 3); 852 /* This sprintf is safe, because of the malloc above */ 853 sprintf(p1, "${%s}", (char *)Lst_Datum(ln)); 854 value = Var_Subst(NULL, p1, VAR_GLOBAL, FALSE); 855 } else { 856 value = Var_Value(Lst_Datum(ln), 857 VAR_GLOBAL, &p1); 858 } 859 printf("%s\n", value ? value : ""); 860 if (p1) 861 free(p1); 862 } 863 } else { 864 865 /* 866 * Have now read the entire graph and need to make a list of targets 867 * to create. If none was given on the command line, we consult the 868 * parsing module to find the main target(s) to create. 869 */ 870 Lst targs = Lst_Initializer(targs); 871 872 if (Lst_IsEmpty(&create)) 873 Parse_MainName(&targs); 874 else 875 Targ_FindList(&targs, &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 Job_Init(maxJobs); 886 jobsRunning = TRUE; 887 } 888 889 /* Traverse the graph, checking on all the targets */ 890 outOfDate = Make_Run(&targs); 891 } else { 892 /* 893 * Compat_Init will take care of creating all the targets as 894 * well as initializing the module. 895 */ 896 Compat_Run(&targs); 897 outOfDate = 0; 898 } 899 Lst_Destroy(&targs, NOFREE); 900 } 901 902 Lst_Destroy(&variables, free); 903 Lst_Destroy(&makefiles, free); 904 Lst_Destroy(&create, free); 905 906 /* print the graph now it's been processed if the user requested it */ 907 if (DEBUG(GRAPH2)) 908 Targ_PrintGraph(2); 909 910 if (queryFlag && outOfDate) 911 return (1); 912 else 913 return (0); 914} 915 916/*- 917 * ReadMakefile -- 918 * Open and parse the given makefile. 919 * 920 * Results: 921 * TRUE if ok. FALSE if couldn't open file. 922 * 923 * Side Effects: 924 * lots 925 */ 926static Boolean 927ReadMakefile(const void *p, const void *q __unused) 928{ 929 char *fname; /* makefile to read */ 930 FILE *stream; 931 char *name, path[MAXPATHLEN]; 932 char *MAKEFILE; 933 int setMAKEFILE; 934 935 /* XXX - remove this once constification is done */ 936 fname = estrdup(p); 937 938 if (!strcmp(fname, "-")) { 939 Parse_File("(stdin)", stdin); 940 Var_Set("MAKEFILE", "", VAR_GLOBAL); 941 } else { 942 setMAKEFILE = strcmp(fname, ".depend"); 943 944 /* if we've chdir'd, rebuild the path name */ 945 if (curdir != objdir && *fname != '/') { 946 snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname); 947 /* 948 * XXX The realpath stuff breaks relative includes 949 * XXX in some cases. The problem likely is in 950 * XXX parse.c where it does special things in 951 * XXX ParseDoInclude if the file is relateive 952 * XXX or absolute and not a system file. There 953 * XXX it assumes that if the current file that's 954 * XXX being included is absolute, that any files 955 * XXX that it includes shouldn't do the -I path 956 * XXX stuff, which is inconsistant with historical 957 * XXX behavior. However, I can't pentrate the mists 958 * XXX further, so I'm putting this workaround in 959 * XXX here until such time as the underlying bug 960 * XXX can be fixed. 961 */ 962#if THIS_BREAKS_THINGS 963 if (realpath(path, path) != NULL && 964 (stream = fopen(path, "r")) != NULL) { 965 MAKEFILE = fname; 966 fname = path; 967 goto found; 968 } 969 } else if (realpath(fname, path) != NULL) { 970 MAKEFILE = fname; 971 fname = path; 972 if ((stream = fopen(fname, "r")) != NULL) 973 goto found; 974 } 975#else 976 if ((stream = fopen(path, "r")) != NULL) { 977 MAKEFILE = fname; 978 fname = path; 979 goto found; 980 } 981 } else { 982 MAKEFILE = fname; 983 if ((stream = fopen(fname, "r")) != NULL) 984 goto found; 985 } 986#endif 987 /* look in -I and system include directories. */ 988 name = Dir_FindFile(fname, &parseIncPath); 989 if (!name) 990 name = Dir_FindFile(fname, &sysIncPath); 991 if (!name || !(stream = fopen(name, "r"))) 992 return (FALSE); 993 MAKEFILE = fname = name; 994 /* 995 * set the MAKEFILE variable desired by System V fans -- the 996 * placement of the setting here means it gets set to the last 997 * makefile specified, as it is set by SysV make. 998 */ 999found: 1000 if (setMAKEFILE) 1001 Var_Set("MAKEFILE", MAKEFILE, VAR_GLOBAL); 1002 Parse_File(fname, stream); 1003 fclose(stream); 1004 } 1005 return (TRUE); 1006} 1007 1008/*- 1009 * Cmd_Exec -- 1010 * Execute the command in cmd, and return the output of that command 1011 * in a string. 1012 * 1013 * Results: 1014 * A string containing the output of the command, or the empty string 1015 * If error is not NULL, it contains the reason for the command failure 1016 * 1017 * Side Effects: 1018 * The string must be freed by the caller. 1019 */ 1020Buffer * 1021Cmd_Exec(char *cmd, const char **error) 1022{ 1023 int fds[2]; /* Pipe streams */ 1024 int cpid; /* Child PID */ 1025 int pid; /* PID from wait() */ 1026 int status; /* command exit status */ 1027 Buffer *buf; /* buffer to store the result */ 1028 ssize_t rcnt; 1029 1030 *error = NULL; 1031 buf = Buf_Init(0); 1032 1033 if (shellPath == NULL) 1034 Shell_Init(); 1035 /* 1036 * Open a pipe for fetching its output 1037 */ 1038 if (pipe(fds) == -1) { 1039 *error = "Couldn't create pipe for \"%s\""; 1040 return (buf); 1041 } 1042 1043 /* 1044 * Fork 1045 */ 1046 switch (cpid = vfork()) { 1047 case 0: 1048 /* 1049 * Close input side of pipe 1050 */ 1051 close(fds[0]); 1052 1053 /* 1054 * Duplicate the output stream to the shell's output, then 1055 * shut the extra thing down. Note we don't fetch the error 1056 * stream...why not? Why? 1057 */ 1058 dup2(fds[1], 1); 1059 close(fds[1]); 1060 1061 { 1062 char *args[4]; 1063 1064 /* Set up arguments for shell */ 1065 args[0] = shellName; 1066 args[1] = "-c"; 1067 args[2] = cmd; 1068 args[3] = NULL; 1069 1070 execv(shellPath, args); 1071 _exit(1); 1072 /*NOTREACHED*/ 1073 } 1074 1075 case -1: 1076 *error = "Couldn't exec \"%s\""; 1077 return (buf); 1078 1079 default: 1080 /* 1081 * No need for the writing half 1082 */ 1083 close(fds[1]); 1084 1085 do { 1086 char result[BUFSIZ]; 1087 rcnt = read(fds[0], result, sizeof(result)); 1088 if (rcnt != -1) 1089 Buf_AddBytes(buf, (size_t)rcnt, (Byte *)result); 1090 } while (rcnt > 0 || (rcnt == -1 && errno == EINTR)); 1091 1092 if (rcnt == -1) 1093 *error = "Error reading shell's output for \"%s\""; 1094 1095 /* 1096 * Close the input side of the pipe. 1097 */ 1098 close(fds[0]); 1099 1100 /* 1101 * Wait for the process to exit. 1102 */ 1103 while (((pid = wait(&status)) != cpid) && (pid >= 0)) 1104 continue; 1105 1106 if (status) 1107 *error = "\"%s\" returned non-zero status"; 1108 1109 Buf_StripNewlines(buf); 1110 1111 break; 1112 } 1113 return (buf); 1114} 1115 1116/* 1117 * usage -- 1118 * exit with usage message 1119 */ 1120static void 1121usage(void) 1122{ 1123 fprintf(stderr, "%s\n%s\n%s\n", 1124"usage: make [-BPSXeiknqrstv] [-C directory] [-D variable] [-d flags]", 1125" [-E variable] [-f makefile] [-I directory] [-j max_jobs]", 1126" [-m directory] [-V variable] [variable=value] [target ...]"); 1127 exit(2); 1128} 1129