Annotation of src/usr.bin/make/engine.c, Revision 1.17
1.10 espie 1: /* $OpenBSD$ */
1.1 espie 2: /*
3: * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
4: * Copyright (c) 1988, 1989 by Adam de Boor
5: * Copyright (c) 1989 by Berkeley Softworks
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Adam de Boor.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
1.10 espie 36: #include <sys/types.h>
37: #include <sys/wait.h>
1.1 espie 38: #include <limits.h>
39: #include <stdio.h>
1.10 espie 40: #include <stdlib.h>
41: #include <ctype.h>
1.1 espie 42: #include <errno.h>
43: #include <fcntl.h>
44: #include <unistd.h>
45: #include <string.h>
1.10 espie 46: #include <signal.h>
1.1 espie 47: #include "config.h"
48: #include "defines.h"
49: #include "dir.h"
50: #include "engine.h"
51: #include "arch.h"
52: #include "gnode.h"
53: #include "targ.h"
54: #include "var.h"
55: #include "extern.h"
56: #include "lst.h"
57: #include "timestamp.h"
58: #include "make.h"
1.10 espie 59: #include "pathnames.h"
60: #include "error.h"
61: #include "str.h"
62: #include "memory.h"
1.16 espie 63: #include "buf.h"
1.1 espie 64:
65: static void MakeTimeStamp(void *, void *);
1.6 espie 66: static int rewrite_time(const char *);
1.10 espie 67: static void setup_signal(int);
68: static void setup_all_signals(void);
69: static void setup_meta(void);
70: static char **recheck_command_for_shell(char **);
71:
72: static int setup_and_run_command(char *, GNode *, int);
73: static void run_command(const char *, bool);
74: static void handle_compat_interrupts(GNode *);
1.1 espie 75:
76: bool
1.3 espie 77: Job_CheckCommands(GNode *gn, void (*abortProc)(char *, ...))
1.1 espie 78: {
1.11 espie 79: /* Alter our type to tell if errors should be ignored or things
80: * should not be printed so CompatRunCommand knows what to do.
81: */
82: if (Targ_Ignore(gn))
83: gn->type |= OP_IGNORE;
84: if (Targ_Silent(gn))
85: gn->type |= OP_SILENT;
86:
1.3 espie 87: if (OP_NOP(gn->type) && Lst_IsEmpty(&gn->commands) &&
1.9 espie 88: (gn->type & (OP_NODEFAULT | OP_LIB)) == 0) {
1.3 espie 89: /*
90: * No commands. Look for .DEFAULT rule from which we might infer
91: * commands
92: */
1.9 espie 93: if ((DEFAULT->type & OP_DUMMY) == 0 &&
94: !Lst_IsEmpty(&DEFAULT->commands)) {
1.3 espie 95: /*
96: * Make only looks for a .DEFAULT if the node was never
97: * the target of an operator, so that's what we do too.
98: * If a .DEFAULT was given, we substitute its commands
99: * for gn's commands and set the IMPSRC variable to be
100: * the target's name The DEFAULT node acts like a
101: * transformation rule, in that gn also inherits any
102: * attributes or sources attached to .DEFAULT itself.
103: */
104: Make_HandleUse(DEFAULT, gn);
1.16 espie 105: Var(IMPSRC_INDEX, gn) = Var(TARGET_INDEX, gn);
1.3 espie 106: } else if (is_out_of_date(Dir_MTime(gn))) {
107: /*
108: * The node wasn't the target of an operator we have no
109: * .DEFAULT rule to go on and the target doesn't
110: * already exist. There's nothing more we can do for
111: * this branch. If the -k flag wasn't given, we stop in
112: * our tracks, otherwise we just don't update this
113: * node's parents so they never get examined.
114: */
1.5 espie 115: static const char msg[] =
1.3 espie 116: "make: don't know how to make";
117:
118: if (gn->type & OP_OPTIONAL) {
1.5 espie 119: (void)fprintf(stdout, "%s %s(ignored)\n", msg,
1.3 espie 120: gn->name);
121: (void)fflush(stdout);
122: } else if (keepgoing) {
1.5 espie 123: (void)fprintf(stdout, "%s %s(continuing)\n",
1.3 espie 124: msg, gn->name);
125: (void)fflush(stdout);
126: return false;
127: } else {
1.5 espie 128: (*abortProc)("%s %s. Stop in %s.", msg,
1.3 espie 129: gn->name, Var_Value(".CURDIR"));
130: return false;
131: }
132: }
1.1 espie 133: }
1.3 espie 134: return true;
1.1 espie 135: }
136:
1.6 espie 137: /* touch files the hard way, by writing stuff to them */
138: static int
139: rewrite_time(const char *name)
140: {
141: int fd;
142: char c;
143:
144: fd = open(name, O_RDWR | O_CREAT, 0666);
145: if (fd < 0)
146: return -1;
147: /*
148: * Read and write a byte to the file to change
149: * the modification time.
150: */
151: if (read(fd, &c, 1) == 1) {
152: (void)lseek(fd, 0, SEEK_SET);
153: (void)write(fd, &c, 1);
154: }
155:
156: (void)close(fd);
157: return 0;
158: }
159:
1.1 espie 160: void
1.12 espie 161: Job_Touch(GNode *gn)
1.1 espie 162: {
1.3 espie 163: if (gn->type & (OP_JOIN|OP_USE|OP_EXEC|OP_OPTIONAL)) {
164: /*
1.9 espie 165: * .JOIN, .USE, and .OPTIONAL targets are "virtual" targets
166: * and, as such, shouldn't really be created.
1.3 espie 167: */
168: return;
169: }
1.1 espie 170:
1.12 espie 171: if (!(gn->type & OP_SILENT)) {
1.3 espie 172: (void)fprintf(stdout, "touch %s\n", gn->name);
173: (void)fflush(stdout);
174: }
1.1 espie 175:
1.3 espie 176: if (noExecute) {
177: return;
178: }
1.1 espie 179:
1.3 espie 180: if (gn->type & OP_ARCHV) {
181: Arch_Touch(gn);
182: } else if (gn->type & OP_LIB) {
183: Arch_TouchLib(gn);
184: } else {
185: const char *file = gn->path != NULL ? gn->path : gn->name;
186:
187: if (set_times(file) == -1){
1.6 espie 188: if (rewrite_time(file) == -1) {
1.5 espie 189: (void)fprintf(stdout,
190: "*** couldn't touch %s: %s", file,
1.3 espie 191: strerror(errno));
192: (void)fflush(stdout);
1.9 espie 193: }
1.1 espie 194: }
195: }
196: }
197:
198: void
1.7 espie 199: Make_TimeStamp(GNode *parent, GNode *child)
1.1 espie 200: {
1.8 espie 201: if (is_strictly_before(parent->cmtime, child->mtime))
202: parent->cmtime = child->mtime;
1.1 espie 203: }
204:
205: void
1.9 espie 206: Make_HandleUse(GNode *cgn, /* The .USE node */
1.1 espie 207: GNode *pgn) /* The target of the .USE node */
208: {
1.3 espie 209: GNode *gn; /* A child of the .USE node */
210: LstNode ln; /* An element in the children list */
1.1 espie 211:
1.3 espie 212: if (cgn->type & (OP_USE|OP_TRANSFORM)) {
213: if ((cgn->type & OP_USE) || Lst_IsEmpty(&pgn->commands)) {
1.9 espie 214: /* .USE or transformation and target has no commands
215: * -- append the child's commands to the parent. */
1.3 espie 216: Lst_Concat(&pgn->commands, &cgn->commands);
217: }
1.1 espie 218:
1.5 espie 219: for (ln = Lst_First(&cgn->children); ln != NULL;
1.3 espie 220: ln = Lst_Adv(ln)) {
221: gn = (GNode *)Lst_Datum(ln);
222:
223: if (Lst_AddNew(&pgn->children, gn)) {
224: Lst_AtEnd(&gn->parents, pgn);
1.4 espie 225: pgn->unmade++;
1.3 espie 226: }
227: }
1.1 espie 228:
1.3 espie 229: pgn->type |= cgn->type & ~(OP_OPMASK|OP_USE|OP_TRANSFORM);
1.1 espie 230:
1.3 espie 231: /*
232: * This child node is now "made", so we decrement the count of
233: * unmade children in the parent... We also remove the child
234: * from the parent's list to accurately reflect the number of
235: * decent children the parent has. This is used by Make_Run to
1.9 espie 236: * decide whether to queue the parent or examine its children...
1.3 espie 237: */
1.9 espie 238: if (cgn->type & OP_USE)
1.3 espie 239: pgn->unmade--;
1.1 espie 240: }
1.17 ! espie 241: /* if the parent node doesn't have any location, then inherit the
! 242: * use stuff, since that gives us better error messages.
! 243: */
! 244: if (!pgn->lineno) {
! 245: pgn->lineno = cgn->lineno;
! 246: pgn->fname = cgn->fname;
! 247: }
1.1 espie 248: }
249:
1.16 espie 250: void
251: Make_DoAllVar(GNode *gn)
1.1 espie 252: {
1.16 espie 253: GNode *child;
254: LstNode ln;
255: BUFFER allsrc, oodate;
256: char *target;
257: bool do_oodate;
258: int oodate_count, allsrc_count = 0;
259:
260: oodate_count = 0;
261: allsrc_count = 0;
262:
263: for (ln = Lst_First(&gn->children); ln != NULL; ln = Lst_Adv(ln)) {
264: child = (GNode *)Lst_Datum(ln);
265: if ((child->type & (OP_EXEC|OP_USE|OP_INVISIBLE)) != 0)
266: continue;
1.9 espie 267: if (OP_NOP(child->type) ||
1.16 espie 268: (target = Var(TARGET_INDEX, child)) == NULL) {
1.3 espie 269: /*
270: * this node is only source; use the specific pathname
271: * for it
272: */
1.9 espie 273: target = child->path != NULL ? child->path :
274: child->name;
1.3 espie 275: }
1.1 espie 276:
1.16 espie 277: /*
278: * It goes in the OODATE variable if the parent is younger than
279: * the child or if the child has been modified more recently
280: * than the start of the make. This is to keep make from
281: * getting confused if something else updates the parent after
282: * the make starts (shouldn't happen, I know, but sometimes it
283: * does). In such a case, if we've updated the kid, the parent
284: * is likely to have a modification time later than that of the
285: * kid and anything that relies on the OODATE variable will be
286: * hosed.
287: */
288: do_oodate = false;
289: if (gn->type & OP_JOIN) {
1.14 espie 290: if (child->built_status == MADE)
1.16 espie 291: do_oodate = true;
292: } else if (is_strictly_before(gn->mtime, child->mtime) ||
1.9 espie 293: (!is_strictly_before(child->mtime, now) &&
1.16 espie 294: child->built_status == MADE))
295: do_oodate = true;
296: if (do_oodate) {
297: oodate_count++;
298: if (oodate_count == 1)
299: Var(OODATE_INDEX, gn) = target;
300: else {
301: if (oodate_count == 2) {
302: Buf_Init(&oodate, 0);
303: Buf_AddString(&oodate,
304: Var(OODATE_INDEX, gn));
305: }
306: Buf_AddSpace(&oodate);
307: Buf_AddString(&oodate, target);
308: }
309: }
310: allsrc_count++;
311: if (allsrc_count == 1)
312: Var(ALLSRC_INDEX, gn) = target;
313: else {
314: if (allsrc_count == 2) {
315: Buf_Init(&allsrc, 0);
316: Buf_AddString(&allsrc,
317: Var(ALLSRC_INDEX, gn));
318: }
319: Buf_AddSpace(&allsrc);
320: Buf_AddString(&allsrc, target);
1.3 espie 321: }
1.1 espie 322: }
323:
1.16 espie 324: if (allsrc_count > 1)
325: Var(ALLSRC_INDEX, gn) = Buf_Retrieve(&allsrc);
326: if (oodate_count > 1)
327: Var(OODATE_INDEX, gn) = Buf_Retrieve(&oodate);
1.1 espie 328:
1.13 espie 329: if (gn->impliedsrc)
1.16 espie 330: Var(IMPSRC_INDEX, gn) = Var(TARGET_INDEX, gn->impliedsrc);
1.13 espie 331:
1.3 espie 332: if (gn->type & OP_JOIN)
1.16 espie 333: Var(TARGET_INDEX, gn) = Var(ALLSRC_INDEX, gn);
1.1 espie 334: }
335:
336: /* Wrapper to call Make_TimeStamp from a forEach loop. */
337: static void
1.9 espie 338: MakeTimeStamp(void *parent, void *child)
1.1 espie 339: {
1.9 espie 340: Make_TimeStamp((GNode *)parent, (GNode *)child);
1.1 espie 341: }
342:
343: bool
1.9 espie 344: Make_OODate(GNode *gn)
1.1 espie 345: {
1.9 espie 346: bool oodate;
1.1 espie 347:
348: /*
1.3 espie 349: * Certain types of targets needn't even be sought as their datedness
350: * doesn't depend on their modification time...
1.1 espie 351: */
1.15 espie 352: if ((gn->type & (OP_JOIN|OP_USE|OP_EXEC|OP_PHONY)) == 0) {
1.3 espie 353: (void)Dir_MTime(gn);
354: if (DEBUG(MAKE)) {
1.9 espie 355: if (!is_out_of_date(gn->mtime))
1.5 espie 356: printf("modified %s...",
1.3 espie 357: time_to_string(gn->mtime));
1.9 espie 358: else
1.3 espie 359: printf("non-existent...");
360: }
1.1 espie 361: }
362:
363: /*
1.3 espie 364: * A target is remade in one of the following circumstances:
1.9 espie 365: * - its modification time is smaller than that of its youngest child
366: * and it would actually be run (has commands or type OP_NOP)
367: * - it's the object of a force operator
368: * - it has no children, was on the lhs of an operator and doesn't
369: * exist already.
1.3 espie 370: *
371: * Libraries are only considered out-of-date if the archive module says
372: * they are.
1.1 espie 373: */
1.3 espie 374: if (gn->type & OP_USE) {
375: /*
376: * If the node is a USE node it is *never* out of date
377: * no matter *what*.
378: */
1.9 espie 379: if (DEBUG(MAKE))
1.3 espie 380: printf(".USE node...");
381: oodate = false;
382: } else if ((gn->type & OP_LIB) && Arch_IsLib(gn)) {
1.9 espie 383: if (DEBUG(MAKE))
384: printf("library...");
1.3 espie 385:
1.9 espie 386: /* always out of date if no children and :: target */
1.3 espie 387: oodate = Arch_LibOODate(gn) ||
388: (is_out_of_date(gn->cmtime) && (gn->type & OP_DOUBLEDEP));
389: } else if (gn->type & OP_JOIN) {
390: /*
391: * A target with the .JOIN attribute is only considered
392: * out-of-date if any of its children was out-of-date.
393: */
1.9 espie 394: if (DEBUG(MAKE))
1.3 espie 395: printf(".JOIN node...");
396: oodate = gn->childMade;
397: } else if (gn->type & (OP_FORCE|OP_EXEC|OP_PHONY)) {
398: /*
1.9 espie 399: * A node which is the object of the force (!) operator or which
400: * has the .EXEC attribute is always considered out-of-date.
1.3 espie 401: */
402: if (DEBUG(MAKE)) {
1.9 espie 403: if (gn->type & OP_FORCE)
1.3 espie 404: printf("! operator...");
1.9 espie 405: else if (gn->type & OP_PHONY)
1.3 espie 406: printf(".PHONY node...");
1.9 espie 407: else
1.3 espie 408: printf(".EXEC node...");
409: }
410: oodate = true;
411: } else if (is_strictly_before(gn->mtime, gn->cmtime) ||
1.9 espie 412: (is_out_of_date(gn->cmtime) &&
1.3 espie 413: (is_out_of_date(gn->mtime) || (gn->type & OP_DOUBLEDEP)))) {
414: /*
415: * A node whose modification time is less than that of its
416: * youngest child or that has no children (cmtime ==
417: * OUT_OF_DATE) and either doesn't exist (mtime == OUT_OF_DATE)
1.9 espie 418: * or was the object of a :: operator is out-of-date.
1.3 espie 419: */
420: if (DEBUG(MAKE)) {
1.9 espie 421: if (is_strictly_before(gn->mtime, gn->cmtime))
1.3 espie 422: printf("modified before source...");
1.9 espie 423: else if (is_out_of_date(gn->mtime))
1.3 espie 424: printf("non-existent and no sources...");
1.9 espie 425: else
1.3 espie 426: printf(":: operator and no sources...");
427: }
428: oodate = true;
429: } else {
430: oodate = false;
431: }
1.1 espie 432:
1.3 espie 433: /*
434: * If the target isn't out-of-date, the parents need to know its
435: * modification time. Note that targets that appear to be out-of-date
436: * but aren't, because they have no commands and aren't of type OP_NOP,
437: * have their mtime stay below their children's mtime to keep parents
438: * from thinking they're out-of-date.
439: */
440: if (!oodate)
441: Lst_ForEach(&gn->parents, MakeTimeStamp, gn);
1.1 espie 442:
1.3 espie 443: return oodate;
1.1 espie 444: }
445:
1.10 espie 446: volatile sig_atomic_t got_signal;
447:
448: volatile sig_atomic_t got_SIGINT, got_SIGHUP, got_SIGQUIT,
449: got_SIGTERM, got_SIGTSTP, got_SIGTTOU, got_SIGTTIN, got_SIGWINCH;
450:
451: static void
452: setup_signal(int sig)
453: {
454: if (signal(sig, SIG_IGN) != SIG_IGN) {
455: (void)signal(sig, SigHandler);
456: }
457: }
458:
459: void
460: setup_all_signals()
461: {
462: /*
463: * Catch the four signals that POSIX specifies if they aren't ignored.
464: * handle_signal will take care of calling JobInterrupt if appropriate.
465: */
466: setup_signal(SIGINT);
467: setup_signal(SIGHUP);
468: setup_signal(SIGQUIT);
469: setup_signal(SIGTERM);
470: /*
471: * There are additional signals that need to be caught and passed if
472: * either the export system wants to be told directly of signals or if
473: * we're giving each job its own process group (since then it won't get
474: * signals from the terminal driver as we own the terminal)
475: */
476: #if defined(USE_PGRP)
477: setup_signal(SIGTSTP);
478: setup_signal(SIGTTOU);
479: setup_signal(SIGTTIN);
480: setup_signal(SIGWINCH);
481: #endif
482: }
483:
484: void
485: SigHandler(int sig)
486: {
487: switch(sig) {
488: case SIGINT:
489: got_SIGINT++;
490: got_signal = 1;
491: break;
492: case SIGHUP:
493: got_SIGHUP++;
494: got_signal = 1;
495: break;
496: case SIGQUIT:
497: got_SIGQUIT++;
498: got_signal = 1;
499: break;
500: case SIGTERM:
501: got_SIGTERM++;
502: got_signal = 1;
503: break;
504: #ifdef USE_PGRP
505: case SIGTSTP:
506: got_SIGTSTP++;
507: got_signal = 1;
508: break;
509: case SIGTTOU:
510: got_SIGTTOU++;
511: got_signal = 1;
512: break;
513: case SIGTTIN:
514: got_SIGTTIN++;
515: got_signal = 1;
516: break;
517: case SIGWINCH:
518: got_SIGWINCH++;
519: got_signal = 1;
520: break;
521: #endif
522: }
523: }
524:
525: /* The following array is used to make a fast determination of which
526: * characters are interpreted specially by the shell. If a command
527: * contains any of these characters, it is executed by the shell, not
528: * directly by us. */
529: static char meta[256];
530:
531: void
532: setup_meta(void)
533: {
534: char *p;
535:
536: for (p = "#=|^(){};&<>*?[]:$`\\\n"; *p != '\0'; p++)
537: meta[(unsigned char) *p] = 1;
538: /* The null character serves as a sentinel in the string. */
539: meta[0] = 1;
540: }
541:
542: static char **
543: recheck_command_for_shell(char **av)
544: {
545: char *runsh[] = {
546: "alias", "cd", "eval", "exit", "read", "set", "ulimit",
547: "unalias", "unset", "wait", "umask", NULL
548: };
549:
550: char **p;
551:
552: /* optimization: if exec cmd, we avoid the intermediate shell */
553: if (strcmp(av[0], "exec") == 0)
554: av++;
555:
556: for (p = runsh; *p; p++)
557: if (strcmp(av[0], *p) == 0)
558: return NULL;
559:
560: return av;
561: }
562:
563: static void
564: run_command(const char *cmd, bool errCheck)
565: {
566: const char *p;
567: char *shargv[4];
568: char **todo;
569:
570: shargv[0] = _PATH_BSHELL;
571:
572: shargv[1] = errCheck ? "-ec" : "-c";
573: shargv[2] = (char *)cmd;
574: shargv[3] = NULL;
575:
576: todo = shargv;
577:
578:
579: /* Search for meta characters in the command. If there are no meta
580: * characters, there's no need to execute a shell to execute the
581: * command. */
582: for (p = cmd; !meta[(unsigned char)*p]; p++)
583: continue;
584: if (*p == '\0') {
585: char *bp;
586: char **av;
587: int argc;
588: /* No meta-characters, so probably no need to exec a shell.
589: * Break the command into words to form an argument vector
590: * we can execute. */
591: av = brk_string(cmd, &argc, &bp);
592: av = recheck_command_for_shell(av);
593: if (av != NULL)
594: todo = av;
595: }
596: execvp(todo[0], todo);
597:
598: if (errno == ENOENT)
599: fprintf(stderr, "%s: not found\n", todo[0]);
600: else
601: perror(todo[0]);
602: _exit(1);
603: }
604:
605: /*-
606: *-----------------------------------------------------------------------
607: * setup_and_run_command --
608: * Execute the next command for a target. If the command returns an
1.14 espie 609: * error, the node's built_status field is set to ERROR and creation stops.
1.10 espie 610: *
611: * Results:
612: * 0 in case of error, 1 if ok.
613: *
614: * Side Effects:
1.14 espie 615: * The node's 'built_status' field may be set to ERROR.
1.10 espie 616: *-----------------------------------------------------------------------
617: */
618: static int
619: setup_and_run_command(char *cmd, GNode *gn, int dont_fork)
620: {
621: char *cmdStart; /* Start of expanded command */
622: bool silent; /* Don't print command */
623: bool doExecute; /* Execute the command */
624: bool errCheck; /* Check errors */
625: int reason; /* Reason for child's death */
626: int status; /* Description of child's death */
627: pid_t cpid; /* Child actually found */
628: pid_t stat; /* Status of fork */
629:
630: silent = gn->type & OP_SILENT;
631: errCheck = !(gn->type & OP_IGNORE);
632: doExecute = !noExecute;
633:
634: cmdStart = Var_Subst(cmd, &gn->context, false);
635:
636: /* How can we execute a null command ? we warn the user that the
637: * command expanded to nothing (is this the right thing to do?). */
638: if (*cmdStart == '\0') {
639: free(cmdStart);
640: Error("%s expands to empty string", cmd);
641: return 1;
642: } else
643: cmd = cmdStart;
644:
645: for (;; cmd++) {
646: if (*cmd == '@')
647: silent = DEBUG(LOUD) ? false : true;
648: else if (*cmd == '-')
649: errCheck = false;
650: else if (*cmd == '+')
651: doExecute = true;
652: else
653: break;
654: }
655: while (isspace(*cmd))
656: cmd++;
657: /* Print the command before echoing if we're not supposed to be quiet
658: * for this one. We also print the command if -n given. */
659: if (!silent || noExecute) {
660: printf("%s\n", cmd);
661: fflush(stdout);
662: }
663: /* If we're not supposed to execute any commands, this is as far as
664: * we go... */
665: if (!doExecute)
666: return 1;
667:
668: /* if we're running in parallel mode, we try not to fork the last
669: * command, since it's exit status will be just fine... unless
670: * errCheck is not set, in which case we must deal with the
671: * status ourselves.
672: */
673: if (dont_fork && errCheck)
674: run_command(cmd, errCheck);
675: /*NOTREACHED*/
676:
677: /* Fork and execute the single command. If the fork fails, we abort. */
678: switch (cpid = fork()) {
679: case -1:
680: Fatal("Could not fork");
681: /*NOTREACHED*/
682: case 0:
683: run_command(cmd, errCheck);
684: /*NOTREACHED*/
685: default:
686: break;
687: }
688: free(cmdStart);
689:
690: /* The child is off and running. Now all we can do is wait... */
691: while (1) {
692:
693: while ((stat = wait(&reason)) != cpid) {
694: if (stat == -1 && errno != EINTR)
695: break;
696: }
697:
698: if (got_signal)
699: break;
700:
701: if (stat != -1) {
702: if (WIFSTOPPED(reason))
703: status = WSTOPSIG(reason); /* stopped */
704: else if (WIFEXITED(reason)) {
705: status = WEXITSTATUS(reason); /* exited */
706: if (status != 0)
707: printf("*** Error code %d", status);
708: } else {
709: status = WTERMSIG(reason); /* signaled */
710: printf("*** Signal %d", status);
711: }
712:
713:
714: if (!WIFEXITED(reason) || status != 0) {
715: if (errCheck) {
1.14 espie 716: gn->built_status = ERROR;
1.10 espie 717: if (keepgoing)
718: /* Abort the current target,
719: * but let others continue. */
720: printf(" (continuing)\n");
721: } else {
722: /* Continue executing commands for
723: * this target. If we return 0,
724: * this will happen... */
725: printf(" (ignored)\n");
726: status = 0;
727: }
728: }
729: return !status;
730: } else
731: Fatal("error in wait: %d", stat);
732: /*NOTREACHED*/
733: }
734: return 0;
735: }
736:
737: static void
738: handle_compat_interrupts(GNode *gn)
739: {
740: if (!Targ_Precious(gn)) {
1.16 espie 741: char *file = Var(TARGET_INDEX, gn);
1.10 espie 742:
743: if (!noExecute && eunlink(file) != -1)
744: Error("*** %s removed\n", file);
745: }
746: if (got_SIGINT) {
747: signal(SIGINT, SIG_IGN);
748: signal(SIGTERM, SIG_IGN);
749: signal(SIGHUP, SIG_IGN);
750: signal(SIGQUIT, SIG_IGN);
751: got_signal = 0;
752: got_SIGINT = 0;
753: run_gnode(interrupt_node, 0);
754: exit(255);
755: }
756: exit(255);
757: }
758:
759: int
760: run_gnode(GNode *gn, int parallel)
761: {
762: LstNode ln, nln;
763:
764: if (gn != NULL && (gn->type & OP_DUMMY) == 0) {
1.14 espie 765: gn->built_status = MADE;
1.10 espie 766: for (ln = Lst_First(&gn->commands); ln != NULL; ln = nln) {
767: nln = Lst_Adv(ln);
768: if (setup_and_run_command(Lst_Datum(ln), gn,
769: parallel && nln == NULL) == 0)
770: break;
771: }
772: if (got_signal && !parallel)
773: handle_compat_interrupts(gn);
1.14 espie 774: return gn->built_status;
1.10 espie 775: } else
776: return NOSUCHNODE;
777: }
778:
779: void
780: setup_engine()
781: {
782: static int already_setup = 0;
783:
784: if (!already_setup) {
785: setup_meta();
786: setup_all_signals();
787: already_setup = 1;
788: }
789: }
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