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 8.3 (Berkeley) 04/28/95"; 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 <stdio.h> 31 #include <sys/types.h> 32 #include <sys/signal.h> 33 #include <sys/wait.h> 34 #include <sys/errno.h> 35 #include <sys/stat.h> 36 #include <ctype.h> 37 #include "make.h" 38 #include "hash.h" 39 #include "dir.h" 40 #include "job.h" 41 extern int errno; 42 43 /* 44 * The following array is used to make a fast determination of which 45 * characters are interpreted specially by the shell. If a command 46 * contains any of these characters, it is executed by the shell, not 47 * directly by us. 48 */ 49 50 static char meta[256]; 51 52 static GNode *curTarg = NILGNODE; 53 static GNode *ENDNode; 54 static void CompatInterrupt __P((int)); 55 static int CompatRunCommand __P((ClientData, ClientData)); 56 static int CompatMake __P((ClientData, ClientData)); 57 58 /*- 59 *----------------------------------------------------------------------- 60 * CompatInterrupt -- 61 * Interrupt the creation of the current target and remove it if 62 * it ain't precious. 63 * 64 * Results: 65 * None. 66 * 67 * Side Effects: 68 * The target is removed and the process exits. If .INTERRUPT exists, 69 * its commands are run first WITH INTERRUPTS IGNORED.. 70 * 71 *----------------------------------------------------------------------- 72 */ 73 static void 74 CompatInterrupt (signo) 75 int signo; 76 { 77 GNode *gn; 78 79 if ((curTarg != NILGNODE) && !Targ_Precious (curTarg)) { 80 char *p1; 81 char *file = Var_Value (TARGET, curTarg, &p1); 82 struct stat st; 83 84 if (!noExecute && lstat(file, &st) != -1 && !S_ISDIR(st.st_mode) && 85 unlink(file) != -1) { 86 printf ("*** %s removed\n", file); 87 } 88 if (p1) 89 free(p1); 90 91 /* 92 * Run .INTERRUPT only if hit with interrupt signal 93 */ 94 if (signo == SIGINT) { 95 gn = Targ_FindNode(".INTERRUPT", TARG_NOCREATE); 96 if (gn != NILGNODE) { 97 Lst_ForEach(gn->commands, CompatRunCommand, (ClientData)gn); 98 } 99 } 100 101 } 102 exit (signo); 103 } 104 105 /*- 106 *----------------------------------------------------------------------- 107 * CompatRunCommand -- 108 * Execute the next command for a target. If the command returns an 109 * error, the node's made field is set to ERROR and creation stops. 110 * 111 * Results: 112 * 0 if the command succeeded, 1 if an error occurred. 113 * 114 * Side Effects: 115 * The node's 'made' field may be set to ERROR. 116 * 117 *----------------------------------------------------------------------- 118 */ 119 static int 120 CompatRunCommand (cmdp, gnp) 121 ClientData cmdp; /* Command to execute */ 122 ClientData gnp; /* Node from which the command came */ 123 { 124 char *cmdStart; /* Start of expanded command */ 125 register char *cp; 126 Boolean silent, /* Don't print command */ 127 errCheck; /* Check errors */ 128 union wait reason; /* Reason for child's death */ 129 int status; /* Description of child's death */ 130 int cpid; /* Child actually found */ 131 ReturnStatus stat; /* Status of fork */ 132 LstNode cmdNode; /* Node where current command is located */ 133 char **av; /* Argument vector for thing to exec */ 134 int argc; /* Number of arguments in av or 0 if not 135 * dynamically allocated */ 136 Boolean local; /* TRUE if command should be executed 137 * locally */ 138 char *cmd = (char *) cmdp; 139 GNode *gn = (GNode *) gnp; 140 141 /* 142 * Avoid clobbered variable warnings by forcing the compiler 143 * to ``unregister'' variables 144 */ 145 #if __GNUC__ 146 (void) &av; 147 (void) &errCheck; 148 #endif 149 silent = gn->type & OP_SILENT; 150 errCheck = !(gn->type & OP_IGNORE); 151 152 cmdNode = Lst_Member (gn->commands, (ClientData)cmd); 153 cmdStart = Var_Subst (NULL, cmd, gn, FALSE); 154 155 /* 156 * brk_string will return an argv with a NULL in av[1], thus causing 157 * execvp to choke and die horribly. Besides, how can we execute a null 158 * command? In any case, we warn the user that the command expanded to 159 * nothing (is this the right thing to do?). 160 */ 161 162 if (*cmdStart == '\0') { 163 free(cmdStart); 164 Error("%s expands to empty string", cmd); 165 return(0); 166 } else { 167 cmd = cmdStart; 168 } 169 Lst_Replace (cmdNode, (ClientData)cmdStart); 170 171 if ((gn->type & OP_SAVE_CMDS) && (gn != ENDNode)) { 172 (void)Lst_AtEnd(ENDNode->commands, (ClientData)cmdStart); 173 return(0); 174 } else if (strcmp(cmdStart, "...") == 0) { 175 gn->type |= OP_SAVE_CMDS; 176 return(0); 177 } 178 179 while ((*cmd == '@') || (*cmd == '-')) { 180 if (*cmd == '@') { 181 silent = TRUE; 182 } else { 183 errCheck = FALSE; 184 } 185 cmd++; 186 } 187 188 while (isspace((unsigned char)*cmd)) 189 cmd++; 190 191 /* 192 * Search for meta characters in the command. If there are no meta 193 * characters, there's no need to execute a shell to execute the 194 * command. 195 */ 196 for (cp = cmd; !meta[(unsigned char)*cp]; cp++) { 197 continue; 198 } 199 200 /* 201 * Print the command before echoing if we're not supposed to be quiet for 202 * this one. We also print the command if -n given. 203 */ 204 if (!silent || noExecute) { 205 printf ("%s\n", cmd); 206 fflush(stdout); 207 } 208 209 /* 210 * If we're not supposed to execute any commands, this is as far as 211 * we go... 212 */ 213 if (noExecute) { 214 return (0); 215 } 216 217 if (*cp != '\0') { 218 /* 219 * If *cp isn't the null character, we hit a "meta" character and 220 * need to pass the command off to the shell. We give the shell the 221 * -e flag as well as -c if it's supposed to exit when it hits an 222 * error. 223 */ 224 static char *shargv[4] = { "/bin/sh" }; 225 226 shargv[1] = (errCheck ? "-ec" : "-c"); 227 shargv[2] = cmd; 228 shargv[3] = (char *)NULL; 229 av = shargv; 230 argc = 0; 231 } else { 232 /* 233 * No meta-characters, so no need to exec a shell. Break the command 234 * into words to form an argument vector we can execute. 235 * brk_string sticks our name in av[0], so we have to 236 * skip over it... 237 */ 238 av = brk_string(cmd, &argc, TRUE); 239 av += 1; 240 } 241 242 local = TRUE; 243 244 /* 245 * Fork and execute the single command. If the fork fails, we abort. 246 */ 247 cpid = vfork(); 248 if (cpid < 0) { 249 Fatal("Could not fork"); 250 } 251 if (cpid == 0) { 252 if (local) { 253 execvp(av[0], av); 254 (void) write (2, av[0], strlen (av[0])); 255 (void) write (2, ": not found\n", sizeof(": not found")); 256 } else { 257 (void)execv(av[0], av); 258 } 259 exit(1); 260 } 261 free(cmdStart); 262 Lst_Replace (cmdNode, (ClientData) NULL); 263 264 /* 265 * The child is off and running. Now all we can do is wait... 266 */ 267 while (1) { 268 269 while ((stat = wait((int *)&reason)) != cpid) { 270 if (stat == -1 && errno != EINTR) { 271 break; 272 } 273 } 274 275 if (stat > -1) { 276 if (WIFSTOPPED(reason)) { 277 status = reason.w_stopval; /* stopped */ 278 } else if (WIFEXITED(reason)) { 279 status = reason.w_retcode; /* exited */ 280 if (status != 0) { 281 printf ("*** Error code %d", status); 282 } 283 } else { 284 status = reason.w_termsig; /* signaled */ 285 printf ("*** Signal %d", status); 286 } 287 288 289 if (!WIFEXITED(reason) || (status != 0)) { 290 if (errCheck) { 291 gn->made = ERROR; 292 if (keepgoing) { 293 /* 294 * Abort the current target, but let others 295 * continue. 296 */ 297 printf (" (continuing)\n"); 298 } 299 } else { 300 /* 301 * Continue executing commands for this target. 302 * If we return 0, this will happen... 303 */ 304 printf (" (ignored)\n"); 305 status = 0; 306 } 307 } 308 break; 309 } else { 310 Fatal ("error in wait: %d", stat); 311 /*NOTREACHED*/ 312 } 313 } 314 315 return (status); 316 } 317 318 /*- 319 *----------------------------------------------------------------------- 320 * CompatMake -- 321 * Make a target. 322 * 323 * Results: 324 * 0 325 * 326 * Side Effects: 327 * If an error is detected and not being ignored, the process exits. 328 * 329 *----------------------------------------------------------------------- 330 */ 331 static int 332 CompatMake (gnp, pgnp) 333 ClientData gnp; /* The node to make */ 334 ClientData pgnp; /* Parent to abort if necessary */ 335 { 336 GNode *gn = (GNode *) gnp; 337 GNode *pgn = (GNode *) pgnp; 338 if (gn->type & OP_USE) { 339 Make_HandleUse(gn, pgn); 340 } else if (gn->made == UNMADE) { 341 /* 342 * First mark ourselves to be made, then apply whatever transformations 343 * the suffix module thinks are necessary. Once that's done, we can 344 * descend and make all our children. If any of them has an error 345 * but the -k flag was given, our 'make' field will be set FALSE again. 346 * This is our signal to not attempt to do anything but abort our 347 * parent as well. 348 */ 349 gn->make = TRUE; 350 gn->made = BEINGMADE; 351 Suff_FindDeps (gn); 352 Lst_ForEach (gn->children, CompatMake, (ClientData)gn); 353 if (!gn->make) { 354 gn->made = ABORTED; 355 pgn->make = FALSE; 356 return (0); 357 } 358 359 if (Lst_Member (gn->iParents, pgn) != NILLNODE) { 360 char *p1; 361 Var_Set (IMPSRC, Var_Value(TARGET, gn, &p1), pgn); 362 if (p1) 363 free(p1); 364 } 365 366 /* 367 * All the children were made ok. Now cmtime contains the modification 368 * time of the newest child, we need to find out if we exist and when 369 * we were modified last. The criteria for datedness are defined by the 370 * Make_OODate function. 371 */ 372 if (DEBUG(MAKE)) { 373 printf("Examining %s...", gn->name); 374 } 375 if (! Make_OODate(gn)) { 376 gn->made = UPTODATE; 377 if (DEBUG(MAKE)) { 378 printf("up-to-date.\n"); 379 } 380 return (0); 381 } else if (DEBUG(MAKE)) { 382 printf("out-of-date.\n"); 383 } 384 385 /* 386 * If the user is just seeing if something is out-of-date, exit now 387 * to tell him/her "yes". 388 */ 389 if (queryFlag) { 390 exit (-1); 391 } 392 393 /* 394 * We need to be re-made. We also have to make sure we've got a $? 395 * variable. To be nice, we also define the $> variable using 396 * Make_DoAllVar(). 397 */ 398 Make_DoAllVar(gn); 399 400 /* 401 * Alter our type to tell if errors should be ignored or things 402 * should not be printed so CompatRunCommand knows what to do. 403 */ 404 if (Targ_Ignore (gn)) { 405 gn->type |= OP_IGNORE; 406 } 407 if (Targ_Silent (gn)) { 408 gn->type |= OP_SILENT; 409 } 410 411 if (Job_CheckCommands (gn, Fatal)) { 412 /* 413 * Our commands are ok, but we still have to worry about the -t 414 * flag... 415 */ 416 if (!touchFlag) { 417 curTarg = gn; 418 Lst_ForEach (gn->commands, CompatRunCommand, (ClientData)gn); 419 curTarg = NILGNODE; 420 } else { 421 Job_Touch (gn, gn->type & OP_SILENT); 422 } 423 } else { 424 gn->made = ERROR; 425 } 426 427 if (gn->made != ERROR) { 428 /* 429 * If the node was made successfully, mark it so, update 430 * its modification time and timestamp all its parents. Note 431 * that for .ZEROTIME targets, the timestamping isn't done. 432 * This is to keep its state from affecting that of its parent. 433 */ 434 gn->made = MADE; 435 #ifndef RECHECK 436 /* 437 * We can't re-stat the thing, but we can at least take care of 438 * rules where a target depends on a source that actually creates 439 * the target, but only if it has changed, e.g. 440 * 441 * parse.h : parse.o 442 * 443 * parse.o : parse.y 444 * yacc -d parse.y 445 * cc -c y.tab.c 446 * mv y.tab.o parse.o 447 * cmp -s y.tab.h parse.h || mv y.tab.h parse.h 448 * 449 * In this case, if the definitions produced by yacc haven't 450 * changed from before, parse.h won't have been updated and 451 * gn->mtime will reflect the current modification time for 452 * parse.h. This is something of a kludge, I admit, but it's a 453 * useful one.. 454 * 455 * XXX: People like to use a rule like 456 * 457 * FRC: 458 * 459 * To force things that depend on FRC to be made, so we have to 460 * check for gn->children being empty as well... 461 */ 462 if (!Lst_IsEmpty(gn->commands) || Lst_IsEmpty(gn->children)) { 463 gn->mtime = now; 464 } 465 #else 466 /* 467 * This is what Make does and it's actually a good thing, as it 468 * allows rules like 469 * 470 * cmp -s y.tab.h parse.h || cp y.tab.h parse.h 471 * 472 * to function as intended. Unfortunately, thanks to the stateless 473 * nature of NFS (and the speed of this program), there are times 474 * when the modification time of a file created on a remote 475 * machine will not be modified before the stat() implied by 476 * the Dir_MTime occurs, thus leading us to believe that the file 477 * is unchanged, wreaking havoc with files that depend on this one. 478 * 479 * I have decided it is better to make too much than to make too 480 * little, so this stuff is commented out unless you're sure it's 481 * ok. 482 * -- ardeb 1/12/88 483 */ 484 if (noExecute || Dir_MTime(gn) == 0) { 485 gn->mtime = now; 486 } 487 if (gn->cmtime > gn->mtime) 488 gn->mtime = gn->cmtime; 489 if (DEBUG(MAKE)) { 490 printf("update time: %s\n", Targ_FmtTime(gn->mtime)); 491 } 492 #endif 493 if (!(gn->type & OP_EXEC)) { 494 pgn->childMade = TRUE; 495 Make_TimeStamp(pgn, gn); 496 } 497 } else if (keepgoing) { 498 pgn->make = FALSE; 499 } else { 500 printf ("\n\nStop.\n"); 501 exit (1); 502 } 503 } else if (gn->made == ERROR) { 504 /* 505 * Already had an error when making this beastie. Tell the parent 506 * to abort. 507 */ 508 pgn->make = FALSE; 509 } else { 510 if (Lst_Member (gn->iParents, pgn) != NILLNODE) { 511 char *p1; 512 Var_Set (IMPSRC, Var_Value(TARGET, gn, &p1), pgn); 513 if (p1) 514 free(p1); 515 } 516 switch(gn->made) { 517 case BEINGMADE: 518 Error("Graph cycles through %s\n", gn->name); 519 gn->made = ERROR; 520 pgn->make = FALSE; 521 break; 522 case MADE: 523 if ((gn->type & OP_EXEC) == 0) { 524 pgn->childMade = TRUE; 525 Make_TimeStamp(pgn, gn); 526 } 527 break; 528 case UPTODATE: 529 if ((gn->type & OP_EXEC) == 0) { 530 Make_TimeStamp(pgn, gn); 531 } 532 break; 533 default: 534 break; 535 } 536 } 537 538 return (0); 539 } 540 541 /*- 542 *----------------------------------------------------------------------- 543 * Compat_Run -- 544 * Initialize this mode and start making. 545 * 546 * Results: 547 * None. 548 * 549 * Side Effects: 550 * Guess what? 551 * 552 *----------------------------------------------------------------------- 553 */ 554 void 555 Compat_Run(targs) 556 Lst targs; /* List of target nodes to re-create */ 557 { 558 char *cp; /* Pointer to string of shell meta-characters */ 559 GNode *gn = NULL;/* Current root target */ 560 int errors; /* Number of targets not remade due to errors */ 561 562 if (signal(SIGINT, SIG_IGN) != SIG_IGN) { 563 signal(SIGINT, CompatInterrupt); 564 } 565 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) { 566 signal(SIGTERM, CompatInterrupt); 567 } 568 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) { 569 signal(SIGHUP, CompatInterrupt); 570 } 571 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) { 572 signal(SIGQUIT, CompatInterrupt); 573 } 574 575 for (cp = "#=|^(){};&<>*?[]:$`\\\n"; *cp != '\0'; cp++) { 576 meta[(unsigned char) *cp] = 1; 577 } 578 /* 579 * The null character serves as a sentinel in the string. 580 */ 581 meta[0] = 1; 582 583 ENDNode = Targ_FindNode(".END", TARG_CREATE); 584 /* 585 * If the user has defined a .BEGIN target, execute the commands attached 586 * to it. 587 */ 588 if (!queryFlag) { 589 gn = Targ_FindNode(".BEGIN", TARG_NOCREATE); 590 if (gn != NILGNODE) { 591 Lst_ForEach(gn->commands, CompatRunCommand, (ClientData)gn); 592 } 593 } 594 595 /* 596 * For each entry in the list of targets to create, call CompatMake on 597 * it to create the thing. CompatMake will leave the 'made' field of gn 598 * in one of several states: 599 * UPTODATE gn was already up-to-date 600 * MADE gn was recreated successfully 601 * ERROR An error occurred while gn was being created 602 * ABORTED gn was not remade because one of its inferiors 603 * could not be made due to errors. 604 */ 605 errors = 0; 606 while (!Lst_IsEmpty (targs)) { 607 gn = (GNode *) Lst_DeQueue (targs); 608 CompatMake (gn, gn); 609 610 if (gn->made == UPTODATE) { 611 printf ("`%s' is up to date.\n", gn->name); 612 } else if (gn->made == ABORTED) { 613 printf ("`%s' not remade because of errors.\n", gn->name); 614 errors += 1; 615 } 616 } 617 618 /* 619 * If the user has defined a .END target, run its commands. 620 */ 621 if (errors == 0) { 622 Lst_ForEach(ENDNode->commands, CompatRunCommand, (ClientData)gn); 623 } 624 } 625