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 * %sccs.include.redist.c% 11 */ 12 13 #ifndef lint 14 static char sccsid[] = "@(#)compat.c 8.2 (Berkeley) 03/19/94"; 15 #endif /* not lint */ 16 17 /*- 18 * compat.c -- 19 * The routines in this file implement the full-compatibility 20 * mode of PMake. Most of the special functionality of PMake 21 * is available in this mode. Things not supported: 22 * - different shells. 23 * - friendly variable substitution. 24 * 25 * Interface: 26 * Compat_Run Initialize things for this module and recreate 27 * thems as need creatin' 28 */ 29 30 #include <sys/types.h> 31 #include <sys/stat.h> 32 #include <sys/wait.h> 33 34 #include <ctype.h> 35 #include <errno.h> 36 #include <signal.h> 37 #include <stdio.h> 38 39 #include "make.h" 40 #include "hash.h" 41 #include "dir.h" 42 #include "job.h" 43 extern int errno; 44 45 /* 46 * The following array is used to make a fast determination of which 47 * characters are interpreted specially by the shell. If a command 48 * contains any of these characters, it is executed by the shell, not 49 * directly by us. 50 */ 51 52 static char meta[256]; 53 54 static GNode *curTarg = NILGNODE; 55 static GNode *ENDNode; 56 static void CompatInterrupt __P((int)); 57 static int CompatRunCommand __P((char *, GNode *)); 58 static int CompatMake __P((GNode *, GNode *)); 59 60 /*- 61 *----------------------------------------------------------------------- 62 * CompatInterrupt -- 63 * Interrupt the creation of the current target and remove it if 64 * it ain't precious. 65 * 66 * Results: 67 * None. 68 * 69 * Side Effects: 70 * The target is removed and the process exits. If .INTERRUPT exists, 71 * its commands are run first WITH INTERRUPTS IGNORED.. 72 * 73 *----------------------------------------------------------------------- 74 */ 75 static void 76 CompatInterrupt (signo) 77 int signo; 78 { 79 struct stat sb; 80 GNode *gn; 81 82 if ((curTarg != NILGNODE) && !Targ_Precious (curTarg)) { 83 char *file = Var_Value (TARGET, curTarg); 84 85 if (!stat(file, &sb) && S_ISREG(sb.st_mode) && 86 unlink (file) == SUCCESS) { 87 printf ("*** %s removed\n", file); 88 } 89 90 /* 91 * Run .INTERRUPT only if hit with interrupt signal 92 */ 93 if (signo == SIGINT) { 94 gn = Targ_FindNode(".INTERRUPT", TARG_NOCREATE); 95 if (gn != NILGNODE) { 96 Lst_ForEach(gn->commands, CompatRunCommand, (ClientData)gn); 97 } 98 } 99 } 100 exit (0); 101 } 102 103 /*- 104 *----------------------------------------------------------------------- 105 * CompatRunCommand -- 106 * Execute the next command for a target. If the command returns an 107 * error, the node's made field is set to ERROR and creation stops. 108 * 109 * Results: 110 * 0 if the command succeeded, 1 if an error occurred. 111 * 112 * Side Effects: 113 * The node's 'made' field may be set to ERROR. 114 * 115 *----------------------------------------------------------------------- 116 */ 117 static int 118 CompatRunCommand (cmd, gn) 119 char *cmd; /* Command to execute */ 120 GNode *gn; /* Node from which the command came */ 121 { 122 char *cmdStart; /* Start of expanded command */ 123 register char *cp; 124 Boolean silent, /* Don't print command */ 125 errCheck; /* Check errors */ 126 union wait reason; /* Reason for child's death */ 127 int status; /* Description of child's death */ 128 int cpid; /* Child actually found */ 129 ReturnStatus stat; /* Status of fork */ 130 LstNode cmdNode; /* Node where current command is located */ 131 char **av; /* Argument vector for thing to exec */ 132 int argc; /* Number of arguments in av or 0 if not 133 * dynamically allocated */ 134 Boolean local; /* TRUE if command should be executed 135 * locally */ 136 137 /* 138 * Avoid clobbered variable warnings by forcing the compiler 139 * to ``unregister'' variables 140 */ 141 #if __GNUC__ 142 (void) &av; 143 (void) &errCheck; 144 #endif 145 146 silent = gn->type & OP_SILENT; 147 errCheck = !(gn->type & OP_IGNORE); 148 149 cmdNode = Lst_Member (gn->commands, (ClientData)cmd); 150 cmdStart = Var_Subst (NULL, cmd, gn, FALSE); 151 152 /* 153 * brk_string will return an argv with a NULL in av[1], thus causing 154 * execvp to choke and die horribly. Besides, how can we execute a null 155 * command? In any case, we warn the user that the command expanded to 156 * nothing (is this the right thing to do?). 157 */ 158 159 if (*cmdStart == '\0') { 160 Error("%s expands to empty string", cmd); 161 return(0); 162 } else { 163 cmd = cmdStart; 164 } 165 Lst_Replace (cmdNode, (ClientData)cmdStart); 166 167 if ((gn->type & OP_SAVE_CMDS) && (gn != ENDNode)) { 168 (void)Lst_AtEnd(ENDNode->commands, (ClientData)cmdStart); 169 return(0); 170 } else if (strcmp(cmdStart, "...") == 0) { 171 gn->type |= OP_SAVE_CMDS; 172 return(0); 173 } 174 175 while ((*cmd == '@') || (*cmd == '-')) { 176 if (*cmd == '@') { 177 silent = TRUE; 178 } else { 179 errCheck = FALSE; 180 } 181 cmd++; 182 } 183 184 while (isspace((unsigned char)*cmd)) 185 cmd++; 186 187 /* 188 * Search for meta characters in the command. If there are no meta 189 * characters, there's no need to execute a shell to execute the 190 * command. 191 */ 192 for (cp = cmd; !meta[(unsigned char)*cp]; cp++) { 193 continue; 194 } 195 196 /* 197 * Print the command before echoing if we're not supposed to be quiet for 198 * this one. We also print the command if -n given. 199 */ 200 if (!silent || noExecute) { 201 printf ("%s\n", cmd); 202 fflush(stdout); 203 } 204 205 /* 206 * If we're not supposed to execute any commands, this is as far as 207 * we go... 208 */ 209 if (noExecute) { 210 return (0); 211 } 212 213 if (*cp != '\0') { 214 /* 215 * If *cp isn't the null character, we hit a "meta" character and 216 * need to pass the command off to the shell. We give the shell the 217 * -e flag as well as -c if it's supposed to exit when it hits an 218 * error. 219 */ 220 static char *shargv[4] = { "/bin/sh" }; 221 222 shargv[1] = (errCheck ? "-ec" : "-c"); 223 shargv[2] = cmd; 224 shargv[3] = (char *)NULL; 225 av = shargv; 226 argc = 0; 227 } else { 228 /* 229 * No meta-characters, so no need to exec a shell. Break the command 230 * into words to form an argument vector we can execute. 231 * brk_string sticks our name in av[0], so we have to 232 * skip over it... 233 */ 234 av = brk_string(cmd, &argc); 235 av += 1; 236 } 237 238 local = TRUE; 239 240 /* 241 * Fork and execute the single command. If the fork fails, we abort. 242 */ 243 cpid = vfork(); 244 if (cpid < 0) { 245 Fatal("Could not fork"); 246 } 247 if (cpid == 0) { 248 if (local) { 249 execvp(av[0], av); 250 (void) write (2, av[0], strlen (av[0])); 251 (void) write (2, ": not found\n", sizeof(": not found")); 252 } else { 253 (void)execv(av[0], av); 254 } 255 exit(1); 256 } 257 258 /* 259 * The child is off and running. Now all we can do is wait... 260 */ 261 while (1) { 262 int id; 263 264 if (!local) { 265 id = 0; 266 } 267 268 while ((stat = wait((int *)&reason)) != cpid) { 269 if (stat == -1 && errno != EINTR) { 270 break; 271 } 272 } 273 274 if (stat > -1) { 275 if (WIFSTOPPED(reason)) { 276 status = reason.w_stopval; /* stopped */ 277 } else if (WIFEXITED(reason)) { 278 status = reason.w_retcode; /* exited */ 279 if (status != 0) { 280 printf ("*** Error code %d", status); 281 } 282 } else { 283 status = reason.w_termsig; /* signaled */ 284 printf ("*** Signal %d", status); 285 } 286 287 288 if (!WIFEXITED(reason) || (status != 0)) { 289 if (errCheck) { 290 gn->made = ERROR; 291 if (keepgoing) { 292 /* 293 * Abort the current target, but let others 294 * continue. 295 */ 296 printf (" (continuing)\n"); 297 } 298 } else { 299 /* 300 * Continue executing commands for this target. 301 * If we return 0, this will happen... 302 */ 303 printf (" (ignored)\n"); 304 status = 0; 305 } 306 } 307 break; 308 } else { 309 Fatal ("error in wait: %d", stat); 310 /*NOTREACHED*/ 311 } 312 } 313 314 return (status); 315 } 316 317 /*- 318 *----------------------------------------------------------------------- 319 * CompatMake -- 320 * Make a target. 321 * 322 * Results: 323 * 0 324 * 325 * Side Effects: 326 * If an error is detected and not being ignored, the process exits. 327 * 328 *----------------------------------------------------------------------- 329 */ 330 static int 331 CompatMake (gn, pgn) 332 GNode *gn; /* The node to make */ 333 GNode *pgn; /* Parent to abort if necessary */ 334 { 335 if (gn->type & OP_USE) { 336 Make_HandleUse(gn, pgn); 337 } else if (gn->made == UNMADE) { 338 /* 339 * First mark ourselves to be made, then apply whatever transformations 340 * the suffix module thinks are necessary. Once that's done, we can 341 * descend and make all our children. If any of them has an error 342 * but the -k flag was given, our 'make' field will be set FALSE again. 343 * This is our signal to not attempt to do anything but abort our 344 * parent as well. 345 */ 346 gn->make = TRUE; 347 gn->made = BEINGMADE; 348 Suff_FindDeps (gn); 349 Lst_ForEach (gn->children, CompatMake, (ClientData)gn); 350 if (!gn->make) { 351 gn->made = ABORTED; 352 pgn->make = FALSE; 353 return (0); 354 } 355 356 if (Lst_Member (gn->iParents, pgn) != NILLNODE) { 357 Var_Set (IMPSRC, Var_Value(TARGET, gn), pgn); 358 } 359 360 /* 361 * All the children were made ok. Now cmtime contains the modification 362 * time of the newest child, we need to find out if we exist and when 363 * we were modified last. The criteria for datedness are defined by the 364 * Make_OODate function. 365 */ 366 if (DEBUG(MAKE)) { 367 printf("Examining %s...", gn->name); 368 } 369 if (! Make_OODate(gn)) { 370 gn->made = UPTODATE; 371 if (DEBUG(MAKE)) { 372 printf("up-to-date.\n"); 373 } 374 return (0); 375 } else if (DEBUG(MAKE)) { 376 printf("out-of-date.\n"); 377 } 378 379 /* 380 * If the user is just seeing if something is out-of-date, exit now 381 * to tell him/her "yes". 382 */ 383 if (queryFlag) { 384 exit (-1); 385 } 386 387 /* 388 * We need to be re-made. We also have to make sure we've got a $? 389 * variable. To be nice, we also define the $> variable using 390 * Make_DoAllVar(). 391 */ 392 Make_DoAllVar(gn); 393 394 /* 395 * Alter our type to tell if errors should be ignored or things 396 * should not be printed so CompatRunCommand knows what to do. 397 */ 398 if (Targ_Ignore (gn)) { 399 gn->type |= OP_IGNORE; 400 } 401 if (Targ_Silent (gn)) { 402 gn->type |= OP_SILENT; 403 } 404 405 if (Job_CheckCommands (gn, Fatal)) { 406 /* 407 * Our commands are ok, but we still have to worry about the -t 408 * flag... 409 */ 410 if (!touchFlag) { 411 curTarg = gn; 412 Lst_ForEach (gn->commands, CompatRunCommand, (ClientData)gn); 413 curTarg = NILGNODE; 414 } else { 415 Job_Touch (gn, gn->type & OP_SILENT); 416 } 417 } else { 418 gn->made = ERROR; 419 } 420 421 if (gn->made != ERROR) { 422 /* 423 * If the node was made successfully, mark it so, update 424 * its modification time and timestamp all its parents. Note 425 * that for .ZEROTIME targets, the timestamping isn't done. 426 * This is to keep its state from affecting that of its parent. 427 */ 428 gn->made = MADE; 429 #ifndef RECHECK 430 /* 431 * We can't re-stat the thing, but we can at least take care of 432 * rules where a target depends on a source that actually creates 433 * the target, but only if it has changed, e.g. 434 * 435 * parse.h : parse.o 436 * 437 * parse.o : parse.y 438 * yacc -d parse.y 439 * cc -c y.tab.c 440 * mv y.tab.o parse.o 441 * cmp -s y.tab.h parse.h || mv y.tab.h parse.h 442 * 443 * In this case, if the definitions produced by yacc haven't 444 * changed from before, parse.h won't have been updated and 445 * gn->mtime will reflect the current modification time for 446 * parse.h. This is something of a kludge, I admit, but it's a 447 * useful one.. 448 * 449 * XXX: People like to use a rule like 450 * 451 * FRC: 452 * 453 * To force things that depend on FRC to be made, so we have to 454 * check for gn->children being empty as well... 455 */ 456 if (!Lst_IsEmpty(gn->commands) || Lst_IsEmpty(gn->children)) { 457 gn->mtime = now; 458 } 459 #else 460 /* 461 * This is what Make does and it's actually a good thing, as it 462 * allows rules like 463 * 464 * cmp -s y.tab.h parse.h || cp y.tab.h parse.h 465 * 466 * to function as intended. Unfortunately, thanks to the stateless 467 * nature of NFS (and the speed of this program), there are times 468 * when the modification time of a file created on a remote 469 * machine will not be modified before the stat() implied by 470 * the Dir_MTime occurs, thus leading us to believe that the file 471 * is unchanged, wreaking havoc with files that depend on this one. 472 * 473 * I have decided it is better to make too much than to make too 474 * little, so this stuff is commented out unless you're sure it's 475 * ok. 476 * -- ardeb 1/12/88 477 */ 478 if (noExecute || Dir_MTime(gn) == 0) { 479 gn->mtime = now; 480 } 481 if (gn->cmtime > gn->mtime) 482 gn->mtime = gn->cmtime; 483 if (DEBUG(MAKE)) { 484 printf("update time: %s\n", Targ_FmtTime(gn->mtime)); 485 } 486 #endif 487 if (!(gn->type & OP_EXEC)) { 488 pgn->childMade = TRUE; 489 Make_TimeStamp(pgn, gn); 490 } 491 } else if (keepgoing) { 492 pgn->make = FALSE; 493 } else { 494 printf ("\n\nStop.\n"); 495 exit (1); 496 } 497 } else if (gn->made == ERROR) { 498 /* 499 * Already had an error when making this beastie. Tell the parent 500 * to abort. 501 */ 502 pgn->make = FALSE; 503 } else { 504 if (Lst_Member (gn->iParents, pgn) != NILLNODE) { 505 Var_Set (IMPSRC, Var_Value(TARGET, gn), pgn); 506 } 507 switch(gn->made) { 508 case BEINGMADE: 509 Error("Graph cycles through %s\n", gn->name); 510 gn->made = ERROR; 511 pgn->make = FALSE; 512 break; 513 case MADE: 514 if ((gn->type & OP_EXEC) == 0) { 515 pgn->childMade = TRUE; 516 Make_TimeStamp(pgn, gn); 517 } 518 break; 519 case UPTODATE: 520 if ((gn->type & OP_EXEC) == 0) { 521 Make_TimeStamp(pgn, gn); 522 } 523 break; 524 default: 525 break; 526 } 527 } 528 529 return (0); 530 } 531 532 /*- 533 *----------------------------------------------------------------------- 534 * Compat_Run -- 535 * Initialize this mode and start making. 536 * 537 * Results: 538 * None. 539 * 540 * Side Effects: 541 * Guess what? 542 * 543 *----------------------------------------------------------------------- 544 */ 545 void 546 Compat_Run(targs) 547 Lst targs; /* List of target nodes to re-create */ 548 { 549 char *cp; /* Pointer to string of shell meta-characters */ 550 GNode *gn = NULL;/* Current root target */ 551 int errors; /* Number of targets not remade due to errors */ 552 553 if (signal(SIGINT, SIG_IGN) != SIG_IGN) { 554 signal(SIGINT, CompatInterrupt); 555 } 556 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) { 557 signal(SIGTERM, CompatInterrupt); 558 } 559 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) { 560 signal(SIGHUP, CompatInterrupt); 561 } 562 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) { 563 signal(SIGQUIT, CompatInterrupt); 564 } 565 566 for (cp = "#=|^(){};&<>*?[]:$`\\\n"; *cp != '\0'; cp++) { 567 meta[(unsigned char) *cp] = 1; 568 } 569 /* 570 * The null character serves as a sentinel in the string. 571 */ 572 meta[0] = 1; 573 574 ENDNode = Targ_FindNode(".END", TARG_CREATE); 575 /* 576 * If the user has defined a .BEGIN target, execute the commands attached 577 * to it. 578 */ 579 if (!queryFlag) { 580 gn = Targ_FindNode(".BEGIN", TARG_NOCREATE); 581 if (gn != NILGNODE) { 582 Lst_ForEach(gn->commands, CompatRunCommand, (ClientData)gn); 583 } 584 } 585 586 /* 587 * For each entry in the list of targets to create, call CompatMake on 588 * it to create the thing. CompatMake will leave the 'made' field of gn 589 * in one of several states: 590 * UPTODATE gn was already up-to-date 591 * MADE gn was recreated successfully 592 * ERROR An error occurred while gn was being created 593 * ABORTED gn was not remade because one of its inferiors 594 * could not be made due to errors. 595 */ 596 errors = 0; 597 while (!Lst_IsEmpty (targs)) { 598 gn = (GNode *) Lst_DeQueue (targs); 599 CompatMake (gn, gn); 600 601 if (gn->made == UPTODATE) { 602 printf ("`%s' is up to date.\n", gn->name); 603 } else if (gn->made == ABORTED) { 604 printf ("`%s' not remade because of errors.\n", gn->name); 605 errors += 1; 606 } 607 } 608 609 /* 610 * If the user has defined a .END target, run its commands. 611 */ 612 if (errors == 0) { 613 Lst_ForEach(ENDNode->commands, CompatRunCommand, (ClientData)gn); 614 } 615 } 616