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 8.1 (Berkeley) 06/06/93"; 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 silent = gn->type & OP_SILENT; 138 errCheck = !(gn->type & OP_IGNORE); 139 140 cmdNode = Lst_Member (gn->commands, (ClientData)cmd); 141 cmdStart = Var_Subst (NULL, cmd, gn, FALSE); 142 143 /* 144 * brk_string will return an argv with a NULL in av[1], thus causing 145 * execvp to choke and die horribly. Besides, how can we execute a null 146 * command? In any case, we warn the user that the command expanded to 147 * nothing (is this the right thing to do?). 148 */ 149 150 if (*cmdStart == '\0') { 151 Error("%s expands to empty string", cmd); 152 return(0); 153 } else { 154 cmd = cmdStart; 155 } 156 Lst_Replace (cmdNode, (ClientData)cmdStart); 157 158 if ((gn->type & OP_SAVE_CMDS) && (gn != ENDNode)) { 159 (void)Lst_AtEnd(ENDNode->commands, (ClientData)cmdStart); 160 return(0); 161 } else if (strcmp(cmdStart, "...") == 0) { 162 gn->type |= OP_SAVE_CMDS; 163 return(0); 164 } 165 166 while ((*cmd == '@') || (*cmd == '-')) { 167 if (*cmd == '@') { 168 silent = TRUE; 169 } else { 170 errCheck = FALSE; 171 } 172 cmd++; 173 } 174 175 /* 176 * Search for meta characters in the command. If there are no meta 177 * characters, there's no need to execute a shell to execute the 178 * command. 179 */ 180 for (cp = cmd; !meta[(unsigned char)*cp]; cp++) { 181 continue; 182 } 183 184 /* 185 * Print the command before echoing if we're not supposed to be quiet for 186 * this one. We also print the command if -n given. 187 */ 188 if (!silent || noExecute) { 189 printf ("%s\n", cmd); 190 fflush(stdout); 191 } 192 193 /* 194 * If we're not supposed to execute any commands, this is as far as 195 * we go... 196 */ 197 if (noExecute) { 198 return (0); 199 } 200 201 if (*cp != '\0') { 202 /* 203 * If *cp isn't the null character, we hit a "meta" character and 204 * need to pass the command off to the shell. We give the shell the 205 * -e flag as well as -c if it's supposed to exit when it hits an 206 * error. 207 */ 208 static char *shargv[4] = { "/bin/sh" }; 209 210 shargv[1] = (errCheck ? "-ec" : "-c"); 211 shargv[2] = cmd; 212 shargv[3] = (char *)NULL; 213 av = shargv; 214 argc = 0; 215 } else { 216 /* 217 * No meta-characters, so no need to exec a shell. Break the command 218 * into words to form an argument vector we can execute. 219 * brk_string sticks our name in av[0], so we have to 220 * skip over it... 221 */ 222 av = brk_string(cmd, &argc); 223 av += 1; 224 } 225 226 local = TRUE; 227 228 /* 229 * Fork and execute the single command. If the fork fails, we abort. 230 */ 231 cpid = vfork(); 232 if (cpid < 0) { 233 Fatal("Could not fork"); 234 } 235 if (cpid == 0) { 236 if (local) { 237 execvp(av[0], av); 238 (void) write (2, av[0], strlen (av[0])); 239 (void) write (2, ": not found\n", sizeof(": not found")); 240 } else { 241 (void)execv(av[0], av); 242 } 243 exit(1); 244 } 245 246 /* 247 * The child is off and running. Now all we can do is wait... 248 */ 249 while (1) { 250 int id; 251 252 if (!local) { 253 id = 0; 254 } 255 256 while ((stat = wait((int *)&reason)) != cpid) { 257 if (stat == -1 && errno != EINTR) { 258 break; 259 } 260 } 261 262 if (stat > -1) { 263 if (WIFSTOPPED(reason)) { 264 status = reason.w_stopval; /* stopped */ 265 } else if (WIFEXITED(reason)) { 266 status = reason.w_retcode; /* exited */ 267 if (status != 0) { 268 printf ("*** Error code %d", status); 269 } 270 } else { 271 status = reason.w_termsig; /* signaled */ 272 printf ("*** Signal %d", status); 273 } 274 275 276 if (!WIFEXITED(reason) || (status != 0)) { 277 if (errCheck) { 278 gn->made = ERROR; 279 if (keepgoing) { 280 /* 281 * Abort the current target, but let others 282 * continue. 283 */ 284 printf (" (continuing)\n"); 285 } 286 } else { 287 /* 288 * Continue executing commands for this target. 289 * If we return 0, this will happen... 290 */ 291 printf (" (ignored)\n"); 292 status = 0; 293 } 294 } 295 break; 296 } else { 297 Fatal ("error in wait: %d", stat); 298 /*NOTREACHED*/ 299 } 300 } 301 302 return (status); 303 } 304 305 /*- 306 *----------------------------------------------------------------------- 307 * CompatMake -- 308 * Make a target. 309 * 310 * Results: 311 * 0 312 * 313 * Side Effects: 314 * If an error is detected and not being ignored, the process exits. 315 * 316 *----------------------------------------------------------------------- 317 */ 318 static int 319 CompatMake (gn, pgn) 320 GNode *gn; /* The node to make */ 321 GNode *pgn; /* Parent to abort if necessary */ 322 { 323 if (gn->type & OP_USE) { 324 Make_HandleUse(gn, pgn); 325 } else if (gn->made == UNMADE) { 326 /* 327 * First mark ourselves to be made, then apply whatever transformations 328 * the suffix module thinks are necessary. Once that's done, we can 329 * descend and make all our children. If any of them has an error 330 * but the -k flag was given, our 'make' field will be set FALSE again. 331 * This is our signal to not attempt to do anything but abort our 332 * parent as well. 333 */ 334 gn->make = TRUE; 335 gn->made = BEINGMADE; 336 Suff_FindDeps (gn); 337 Lst_ForEach (gn->children, CompatMake, (ClientData)gn); 338 if (!gn->make) { 339 gn->made = ABORTED; 340 pgn->make = FALSE; 341 return (0); 342 } 343 344 if (Lst_Member (gn->iParents, pgn) != NILLNODE) { 345 Var_Set (IMPSRC, Var_Value(TARGET, gn), pgn); 346 } 347 348 /* 349 * All the children were made ok. Now cmtime contains the modification 350 * time of the newest child, we need to find out if we exist and when 351 * we were modified last. The criteria for datedness are defined by the 352 * Make_OODate function. 353 */ 354 if (DEBUG(MAKE)) { 355 printf("Examining %s...", gn->name); 356 } 357 if (! Make_OODate(gn)) { 358 gn->made = UPTODATE; 359 if (DEBUG(MAKE)) { 360 printf("up-to-date.\n"); 361 } 362 return (0); 363 } else if (DEBUG(MAKE)) { 364 printf("out-of-date.\n"); 365 } 366 367 /* 368 * If the user is just seeing if something is out-of-date, exit now 369 * to tell him/her "yes". 370 */ 371 if (queryFlag) { 372 exit (-1); 373 } 374 375 /* 376 * We need to be re-made. We also have to make sure we've got a $? 377 * variable. To be nice, we also define the $> variable using 378 * Make_DoAllVar(). 379 */ 380 Make_DoAllVar(gn); 381 382 /* 383 * Alter our type to tell if errors should be ignored or things 384 * should not be printed so CompatRunCommand knows what to do. 385 */ 386 if (Targ_Ignore (gn)) { 387 gn->type |= OP_IGNORE; 388 } 389 if (Targ_Silent (gn)) { 390 gn->type |= OP_SILENT; 391 } 392 393 if (Job_CheckCommands (gn, Fatal)) { 394 /* 395 * Our commands are ok, but we still have to worry about the -t 396 * flag... 397 */ 398 if (!touchFlag) { 399 curTarg = gn; 400 Lst_ForEach (gn->commands, CompatRunCommand, (ClientData)gn); 401 curTarg = NILGNODE; 402 } else { 403 Job_Touch (gn, gn->type & OP_SILENT); 404 } 405 } else { 406 gn->made = ERROR; 407 } 408 409 if (gn->made != ERROR) { 410 /* 411 * If the node was made successfully, mark it so, update 412 * its modification time and timestamp all its parents. Note 413 * that for .ZEROTIME targets, the timestamping isn't done. 414 * This is to keep its state from affecting that of its parent. 415 */ 416 gn->made = MADE; 417 #ifndef RECHECK 418 /* 419 * We can't re-stat the thing, but we can at least take care of 420 * rules where a target depends on a source that actually creates 421 * the target, but only if it has changed, e.g. 422 * 423 * parse.h : parse.o 424 * 425 * parse.o : parse.y 426 * yacc -d parse.y 427 * cc -c y.tab.c 428 * mv y.tab.o parse.o 429 * cmp -s y.tab.h parse.h || mv y.tab.h parse.h 430 * 431 * In this case, if the definitions produced by yacc haven't 432 * changed from before, parse.h won't have been updated and 433 * gn->mtime will reflect the current modification time for 434 * parse.h. This is something of a kludge, I admit, but it's a 435 * useful one.. 436 * 437 * XXX: People like to use a rule like 438 * 439 * FRC: 440 * 441 * To force things that depend on FRC to be made, so we have to 442 * check for gn->children being empty as well... 443 */ 444 if (!Lst_IsEmpty(gn->commands) || Lst_IsEmpty(gn->children)) { 445 gn->mtime = now; 446 } 447 #else 448 /* 449 * This is what Make does and it's actually a good thing, as it 450 * allows rules like 451 * 452 * cmp -s y.tab.h parse.h || cp y.tab.h parse.h 453 * 454 * to function as intended. Unfortunately, thanks to the stateless 455 * nature of NFS (and the speed of this program), there are times 456 * when the modification time of a file created on a remote 457 * machine will not be modified before the stat() implied by 458 * the Dir_MTime occurs, thus leading us to believe that the file 459 * is unchanged, wreaking havoc with files that depend on this one. 460 * 461 * I have decided it is better to make too much than to make too 462 * little, so this stuff is commented out unless you're sure it's 463 * ok. 464 * -- ardeb 1/12/88 465 */ 466 if (noExecute || Dir_MTime(gn) == 0) { 467 gn->mtime = now; 468 } 469 if (gn->cmtime > gn->mtime) 470 gn->mtime = gn->cmtime; 471 if (DEBUG(MAKE)) { 472 printf("update time: %s\n", Targ_FmtTime(gn->mtime)); 473 } 474 #endif 475 if (!(gn->type & OP_EXEC)) { 476 pgn->childMade = TRUE; 477 Make_TimeStamp(pgn, gn); 478 } 479 } else if (keepgoing) { 480 pgn->make = FALSE; 481 } else { 482 printf ("\n\nStop.\n"); 483 exit (1); 484 } 485 } else if (gn->made == ERROR) { 486 /* 487 * Already had an error when making this beastie. Tell the parent 488 * to abort. 489 */ 490 pgn->make = FALSE; 491 } else { 492 if (Lst_Member (gn->iParents, pgn) != NILLNODE) { 493 Var_Set (IMPSRC, Var_Value(TARGET, gn), pgn); 494 } 495 switch(gn->made) { 496 case BEINGMADE: 497 Error("Graph cycles through %s\n", gn->name); 498 gn->made = ERROR; 499 pgn->make = FALSE; 500 break; 501 case MADE: 502 if ((gn->type & OP_EXEC) == 0) { 503 pgn->childMade = TRUE; 504 Make_TimeStamp(pgn, gn); 505 } 506 break; 507 case UPTODATE: 508 if ((gn->type & OP_EXEC) == 0) { 509 Make_TimeStamp(pgn, gn); 510 } 511 break; 512 default: 513 break; 514 } 515 } 516 517 return (0); 518 } 519 520 /*- 521 *----------------------------------------------------------------------- 522 * Compat_Run -- 523 * Initialize this mode and start making. 524 * 525 * Results: 526 * None. 527 * 528 * Side Effects: 529 * Guess what? 530 * 531 *----------------------------------------------------------------------- 532 */ 533 void 534 Compat_Run(targs) 535 Lst targs; /* List of target nodes to re-create */ 536 { 537 char *cp; /* Pointer to string of shell meta-characters */ 538 GNode *gn = NULL;/* Current root target */ 539 int errors; /* Number of targets not remade due to errors */ 540 541 if (signal(SIGINT, SIG_IGN) != SIG_IGN) { 542 signal(SIGINT, CompatInterrupt); 543 } 544 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) { 545 signal(SIGTERM, CompatInterrupt); 546 } 547 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) { 548 signal(SIGHUP, CompatInterrupt); 549 } 550 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) { 551 signal(SIGQUIT, CompatInterrupt); 552 } 553 554 for (cp = "#=|^(){};&<>*?[]:$`\\\n"; *cp != '\0'; cp++) { 555 meta[(unsigned char) *cp] = 1; 556 } 557 /* 558 * The null character serves as a sentinel in the string. 559 */ 560 meta[0] = 1; 561 562 ENDNode = Targ_FindNode(".END", TARG_CREATE); 563 /* 564 * If the user has defined a .BEGIN target, execute the commands attached 565 * to it. 566 */ 567 if (!queryFlag) { 568 gn = Targ_FindNode(".BEGIN", TARG_NOCREATE); 569 if (gn != NILGNODE) { 570 Lst_ForEach(gn->commands, CompatRunCommand, (ClientData)gn); 571 } 572 } 573 574 /* 575 * For each entry in the list of targets to create, call CompatMake on 576 * it to create the thing. CompatMake will leave the 'made' field of gn 577 * in one of several states: 578 * UPTODATE gn was already up-to-date 579 * MADE gn was recreated successfully 580 * ERROR An error occurred while gn was being created 581 * ABORTED gn was not remade because one of its inferiors 582 * could not be made due to errors. 583 */ 584 errors = 0; 585 while (!Lst_IsEmpty (targs)) { 586 gn = (GNode *) Lst_DeQueue (targs); 587 CompatMake (gn, gn); 588 589 if (gn->made == UPTODATE) { 590 printf ("`%s' is up to date.\n", gn->name); 591 } else if (gn->made == ABORTED) { 592 printf ("`%s' not remade because of errors.\n", gn->name); 593 errors += 1; 594 } 595 } 596 597 /* 598 * If the user has defined a .END target, run its commands. 599 */ 600 if (errors == 0) { 601 Lst_ForEach(ENDNode->commands, CompatRunCommand, (ClientData)gn); 602 } 603 } 604