1 /* 2 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. 3 * Copyright (c) 1988, 1989 by Adam de Boor 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 5.9 (Berkeley) 05/07/93"; 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 <stdio.h> 31 #include <sys/types.h> 32 #include <sys/stat.h> 33 #include <sys/wait.h> 34 #include <sys/errno.h> 35 #include <signal.h> 36 #include <ctype.h> 37 #include "make.h" 38 extern int errno; 39 40 /* 41 * The following array is used to make a fast determination of which 42 * characters are interpreted specially by the shell. If a command 43 * contains any of these characters, it is executed by the shell, not 44 * directly by us. 45 */ 46 47 static char meta[256]; 48 49 static GNode *curTarg = NILGNODE; 50 static GNode *ENDNode; 51 static int CompatRunCommand(); 52 53 /*- 54 *----------------------------------------------------------------------- 55 * CompatInterrupt -- 56 * Interrupt the creation of the current target and remove it if 57 * it ain't precious. 58 * 59 * Results: 60 * None. 61 * 62 * Side Effects: 63 * The target is removed and the process exits. If .INTERRUPT exists, 64 * its commands are run first WITH INTERRUPTS IGNORED.. 65 * 66 *----------------------------------------------------------------------- 67 */ 68 static void 69 CompatInterrupt (signo) 70 int signo; 71 { 72 GNode *gn; 73 struct stat sb; 74 75 if ((curTarg != NILGNODE) && !Targ_Precious (curTarg)) { 76 char *file = Var_Value (TARGET, curTarg); 77 78 if (!stat(file, &sb) && S_ISREG(sb.st_mode) && 79 unlink (file) == SUCCESS) { 80 printf ("*** %s removed\n", file); 81 } 82 83 /* 84 * Run .INTERRUPT only if hit with interrupt signal 85 */ 86 if (signo == SIGINT) { 87 gn = Targ_FindNode(".INTERRUPT", TARG_NOCREATE); 88 if (gn != NILGNODE) { 89 Lst_ForEach(gn->commands, CompatRunCommand, (ClientData)gn); 90 } 91 } 92 } 93 exit (0); 94 } 95 96 /*- 97 *----------------------------------------------------------------------- 98 * CompatRunCommand -- 99 * Execute the next command for a target. If the command returns an 100 * error, the node's made field is set to ERROR and creation stops. 101 * 102 * Results: 103 * 0 if the command succeeded, 1 if an error occurred. 104 * 105 * Side Effects: 106 * The node's 'made' field may be set to ERROR. 107 * 108 *----------------------------------------------------------------------- 109 */ 110 static int 111 CompatRunCommand (cmd, gn) 112 char *cmd; /* Command to execute */ 113 GNode *gn; /* Node from which the command came */ 114 { 115 char *cmdStart; /* Start of expanded command */ 116 register char *cp; 117 Boolean silent, /* Don't print command */ 118 errCheck; /* Check errors */ 119 union wait reason; /* Reason for child's death */ 120 int status; /* Description of child's death */ 121 int cpid; /* Child actually found */ 122 int numWritten; /* Number of bytes written for error message */ 123 ReturnStatus stat; /* Status of fork */ 124 LstNode cmdNode; /* Node where current command is located */ 125 char **av; /* Argument vector for thing to exec */ 126 int argc; /* Number of arguments in av or 0 if not 127 * dynamically allocated */ 128 Boolean local; /* TRUE if command should be executed 129 * locally */ 130 131 silent = gn->type & OP_SILENT; 132 errCheck = !(gn->type & OP_IGNORE); 133 134 cmdNode = Lst_Member (gn->commands, (ClientData)cmd); 135 cmdStart = Var_Subst (cmd, gn, FALSE); 136 137 /* 138 * brk_string will return an argv with a NULL in av[1], thus causing 139 * execvp to choke and die horribly. Besides, how can we execute a null 140 * command? In any case, we warn the user that the command expanded to 141 * nothing (is this the right thing to do?). 142 */ 143 144 if (*cmdStart == '\0') { 145 Error("%s expands to empty string", cmd); 146 return(0); 147 } else { 148 cmd = cmdStart; 149 } 150 Lst_Replace (cmdNode, (ClientData)cmdStart); 151 152 if ((gn->type & OP_SAVE_CMDS) && (gn != ENDNode)) { 153 (void)Lst_AtEnd(ENDNode->commands, (ClientData)cmdStart); 154 return(0); 155 } else if (strcmp(cmdStart, "...") == 0) { 156 gn->type |= OP_SAVE_CMDS; 157 return(0); 158 } 159 160 while ((*cmd == '@') || (*cmd == '-')) { 161 if (*cmd == '@') { 162 silent = TRUE; 163 } else { 164 errCheck = FALSE; 165 } 166 cmd++; 167 } 168 169 /* 170 * Search for meta characters in the command. If there are no meta 171 * characters, there's no need to execute a shell to execute the 172 * command. 173 */ 174 for (cp = cmd; !meta[*cp]; cp++) { 175 continue; 176 } 177 178 /* 179 * Print the command before echoing if we're not supposed to be quiet for 180 * this one. We also print the command if -n given. 181 */ 182 if (!silent || noExecute) { 183 printf ("%s\n", cmd); 184 fflush(stdout); 185 } 186 187 /* 188 * If we're not supposed to execute any commands, this is as far as 189 * we go... 190 */ 191 if (noExecute) { 192 return (0); 193 } 194 195 if (*cp != '\0') { 196 /* 197 * If *cp isn't the null character, we hit a "meta" character and 198 * need to pass the command off to the shell. We give the shell the 199 * -e flag as well as -c if it's supposed to exit when it hits an 200 * error. 201 */ 202 static char *shargv[4] = { "/bin/sh" }; 203 204 shargv[1] = (errCheck ? "-ec" : "-c"); 205 shargv[2] = cmd; 206 shargv[3] = (char *)NULL; 207 av = shargv; 208 argc = 0; 209 } else { 210 /* 211 * No meta-characters, so no need to exec a shell. Break the command 212 * into words to form an argument vector we can execute. 213 * brk_string sticks our name in av[0], so we have to 214 * skip over it... 215 */ 216 av = brk_string(cmd, &argc); 217 av += 1; 218 } 219 220 local = TRUE; 221 222 /* 223 * Fork and execute the single command. If the fork fails, we abort. 224 */ 225 cpid = vfork(); 226 if (cpid < 0) { 227 Fatal("Could not fork"); 228 } 229 if (cpid == 0) { 230 if (local) { 231 execvp(av[0], av); 232 numWritten = write (2, av[0], strlen (av[0])); 233 numWritten = write (2, ": not found\n", sizeof(": not found")); 234 } else { 235 (void)execv(av[0], av); 236 } 237 exit(1); 238 } 239 240 /* 241 * The child is off and running. Now all we can do is wait... 242 */ 243 while (1) { 244 int id; 245 246 if (!local) { 247 id = 0; 248 } 249 250 while ((stat = wait((int *)&reason)) != cpid) { 251 if (stat == -1 && errno != EINTR) { 252 break; 253 } 254 } 255 256 if (stat > -1) { 257 if (WIFSTOPPED(reason)) { 258 status = reason.w_stopval; /* stopped */ 259 } else if (WIFEXITED(reason)) { 260 status = reason.w_retcode; /* exited */ 261 if (status != 0) { 262 printf ("*** Error code %d", status); 263 } 264 } else { 265 status = reason.w_termsig; /* signaled */ 266 printf ("*** Signal %d", status); 267 } 268 269 270 if (!WIFEXITED(reason) || (status != 0)) { 271 if (errCheck) { 272 gn->made = ERROR; 273 if (keepgoing) { 274 /* 275 * Abort the current target, but let others 276 * continue. 277 */ 278 printf (" (continuing)\n"); 279 } 280 } else { 281 /* 282 * Continue executing commands for this target. 283 * If we return 0, this will happen... 284 */ 285 printf (" (ignored)\n"); 286 status = 0; 287 } 288 } 289 break; 290 } else { 291 Fatal ("error in wait: %d", stat); 292 /*NOTREACHED*/ 293 } 294 } 295 296 return (status); 297 } 298 299 /*- 300 *----------------------------------------------------------------------- 301 * CompatMake -- 302 * Make a target. 303 * 304 * Results: 305 * 0 306 * 307 * Side Effects: 308 * If an error is detected and not being ignored, the process exits. 309 * 310 *----------------------------------------------------------------------- 311 */ 312 static int 313 CompatMake (gn, pgn) 314 GNode *gn; /* The node to make */ 315 GNode *pgn; /* Parent to abort if necessary */ 316 { 317 if (gn->type & OP_USE) { 318 Make_HandleUse(gn, pgn); 319 } else if (gn->made == UNMADE) { 320 /* 321 * First mark ourselves to be made, then apply whatever transformations 322 * the suffix module thinks are necessary. Once that's done, we can 323 * descend and make all our children. If any of them has an error 324 * but the -k flag was given, our 'make' field will be set FALSE again. 325 * This is our signal to not attempt to do anything but abort our 326 * parent as well. 327 */ 328 gn->make = TRUE; 329 gn->made = BEINGMADE; 330 Suff_FindDeps (gn); 331 Lst_ForEach (gn->children, CompatMake, (ClientData)gn); 332 if (!gn->make) { 333 gn->made = ABORTED; 334 pgn->make = FALSE; 335 return (0); 336 } 337 338 if (Lst_Member (gn->iParents, pgn) != NILLNODE) { 339 Var_Set (IMPSRC, Var_Value(TARGET, gn), pgn); 340 } 341 342 /* 343 * All the children were made ok. Now cmtime contains the modification 344 * time of the newest child, we need to find out if we exist and when 345 * we were modified last. The criteria for datedness are defined by the 346 * Make_OODate function. 347 */ 348 if (DEBUG(MAKE)) { 349 printf("Examining %s...", gn->name); 350 } 351 if (! Make_OODate(gn)) { 352 gn->made = UPTODATE; 353 if (DEBUG(MAKE)) { 354 printf("up-to-date.\n"); 355 } 356 return (0); 357 } else if (DEBUG(MAKE)) { 358 printf("out-of-date.\n"); 359 } 360 361 /* 362 * If the user is just seeing if something is out-of-date, exit now 363 * to tell him/her "yes". 364 */ 365 if (queryFlag) { 366 exit (-1); 367 } 368 369 /* 370 * We need to be re-made. We also have to make sure we've got a $? 371 * variable. To be nice, we also define the $> variable using 372 * Make_DoAllVar(). 373 */ 374 Make_DoAllVar(gn); 375 376 /* 377 * Alter our type to tell if errors should be ignored or things 378 * should not be printed so CompatRunCommand knows what to do. 379 */ 380 if (Targ_Ignore (gn)) { 381 gn->type |= OP_IGNORE; 382 } 383 if (Targ_Silent (gn)) { 384 gn->type |= OP_SILENT; 385 } 386 387 if (Job_CheckCommands (gn, Fatal)) { 388 /* 389 * Our commands are ok, but we still have to worry about the -t 390 * flag... 391 */ 392 if (!touchFlag) { 393 curTarg = gn; 394 Lst_ForEach (gn->commands, CompatRunCommand, (ClientData)gn); 395 curTarg = NILGNODE; 396 } else { 397 Job_Touch (gn, gn->type & OP_SILENT); 398 } 399 } else { 400 gn->made = ERROR; 401 } 402 403 if (gn->made != ERROR) { 404 /* 405 * If the node was made successfully, mark it so, update 406 * its modification time and timestamp all its parents. Note 407 * that for .ZEROTIME targets, the timestamping isn't done. 408 * This is to keep its state from affecting that of its parent. 409 */ 410 gn->made = MADE; 411 #ifndef RECHECK 412 /* 413 * We can't re-stat the thing, but we can at least take care of 414 * rules where a target depends on a source that actually creates 415 * the target, but only if it has changed, e.g. 416 * 417 * parse.h : parse.o 418 * 419 * parse.o : parse.y 420 * yacc -d parse.y 421 * cc -c y.tab.c 422 * mv y.tab.o parse.o 423 * cmp -s y.tab.h parse.h || mv y.tab.h parse.h 424 * 425 * In this case, if the definitions produced by yacc haven't 426 * changed from before, parse.h won't have been updated and 427 * gn->mtime will reflect the current modification time for 428 * parse.h. This is something of a kludge, I admit, but it's a 429 * useful one.. 430 * 431 * XXX: People like to use a rule like 432 * 433 * FRC: 434 * 435 * To force things that depend on FRC to be made, so we have to 436 * check for gn->children being empty as well... 437 */ 438 if (!Lst_IsEmpty(gn->commands) || Lst_IsEmpty(gn->children)) { 439 gn->mtime = now; 440 } 441 #else 442 /* 443 * This is what Make does and it's actually a good thing, as it 444 * allows rules like 445 * 446 * cmp -s y.tab.h parse.h || cp y.tab.h parse.h 447 * 448 * to function as intended. Unfortunately, thanks to the stateless 449 * nature of NFS (and the speed of this program), there are times 450 * when the modification time of a file created on a remote 451 * machine will not be modified before the stat() implied by 452 * the Dir_MTime occurs, thus leading us to believe that the file 453 * is unchanged, wreaking havoc with files that depend on this one. 454 * 455 * I have decided it is better to make too much than to make too 456 * little, so this stuff is commented out unless you're sure it's 457 * ok. 458 * -- ardeb 1/12/88 459 */ 460 if (noExecute || Dir_MTime(gn) == 0) { 461 gn->mtime = now; 462 } 463 if (DEBUG(MAKE)) { 464 printf("update time: %s\n", Targ_FmtTime(gn->mtime)); 465 } 466 #endif 467 if (!(gn->type & OP_EXEC)) { 468 pgn->childMade = TRUE; 469 Make_TimeStamp(pgn, gn); 470 } 471 } else if (keepgoing) { 472 pgn->make = FALSE; 473 } else { 474 printf ("\n\nStop.\n"); 475 exit (1); 476 } 477 } else if (gn->made == ERROR) { 478 /* 479 * Already had an error when making this beastie. Tell the parent 480 * to abort. 481 */ 482 pgn->make = FALSE; 483 } else { 484 if (Lst_Member (gn->iParents, pgn) != NILLNODE) { 485 Var_Set (IMPSRC, Var_Value(TARGET, gn), pgn); 486 } 487 switch(gn->made) { 488 case BEINGMADE: 489 Error("Graph cycles through %s\n", gn->name); 490 gn->made = ERROR; 491 pgn->make = FALSE; 492 break; 493 case MADE: 494 if ((gn->type & OP_EXEC) == 0) { 495 pgn->childMade = TRUE; 496 Make_TimeStamp(pgn, gn); 497 } 498 break; 499 case UPTODATE: 500 if ((gn->type & OP_EXEC) == 0) { 501 Make_TimeStamp(pgn, gn); 502 } 503 break; 504 } 505 } 506 507 return (0); 508 } 509 510 /*- 511 *----------------------------------------------------------------------- 512 * Compat_Run -- 513 * Initialize this mode and start making. 514 * 515 * Results: 516 * None. 517 * 518 * Side Effects: 519 * Guess what? 520 * 521 *----------------------------------------------------------------------- 522 */ 523 void 524 Compat_Run(targs) 525 Lst targs; /* List of target nodes to re-create */ 526 { 527 char *cp; /* Pointer to string of shell meta-characters */ 528 GNode *gn; /* Current root target */ 529 int errors; /* Number of targets not remade due to errors */ 530 531 if (signal(SIGINT, SIG_IGN) != SIG_IGN) { 532 signal(SIGINT, CompatInterrupt); 533 } 534 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) { 535 signal(SIGTERM, CompatInterrupt); 536 } 537 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) { 538 signal(SIGHUP, CompatInterrupt); 539 } 540 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) { 541 signal(SIGQUIT, CompatInterrupt); 542 } 543 544 for (cp = "#=|^(){};&<>*?[]:$`\\\n"; *cp != '\0'; cp++) { 545 meta[*cp] = 1; 546 } 547 /* 548 * The null character serves as a sentinel in the string. 549 */ 550 meta[0] = 1; 551 552 ENDNode = Targ_FindNode(".END", TARG_CREATE); 553 /* 554 * If the user has defined a .BEGIN target, execute the commands attached 555 * to it. 556 */ 557 if (!queryFlag) { 558 gn = Targ_FindNode(".BEGIN", TARG_NOCREATE); 559 if (gn != NILGNODE) { 560 Lst_ForEach(gn->commands, CompatRunCommand, (ClientData)gn); 561 } 562 } 563 564 /* 565 * For each entry in the list of targets to create, call CompatMake on 566 * it to create the thing. CompatMake will leave the 'made' field of gn 567 * in one of several states: 568 * UPTODATE gn was already up-to-date 569 * MADE gn was recreated successfully 570 * ERROR An error occurred while gn was being created 571 * ABORTED gn was not remade because one of its inferiors 572 * could not be made due to errors. 573 */ 574 errors = 0; 575 while (!Lst_IsEmpty (targs)) { 576 gn = (GNode *) Lst_DeQueue (targs); 577 CompatMake (gn, gn); 578 579 if (gn->made == UPTODATE) { 580 printf ("`%s' is up to date.\n", gn->name); 581 } else if (gn->made == ABORTED) { 582 printf ("`%s' not remade because of errors.\n", gn->name); 583 errors += 1; 584 } 585 } 586 587 /* 588 * If the user has defined a .END target, run its commands. 589 */ 590 if (errors == 0) { 591 Lst_ForEach(ENDNode->commands, CompatRunCommand, (ClientData)gn); 592 } 593 } 594