/* $OpenPackages$ */ /* $OpenBSD: compat.c,v 1.51 2007/01/04 17:55:35 espie Exp $ */ /* $NetBSD: compat.c,v 1.14 1996/11/06 17:59:01 christos Exp $ */ /* * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. * Copyright (c) 1988, 1989 by Adam de Boor * Copyright (c) 1989 by Berkeley Softworks * All rights reserved. * * This code is derived from software contributed to Berkeley by * Adam de Boor. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "config.h" #include "defines.h" #include "dir.h" #include "job.h" #include "compat.h" #include "suff.h" #include "var.h" #include "targ.h" #include "error.h" #include "str.h" #include "extern.h" #include "memory.h" #include "gnode.h" #include "make.h" #include "timestamp.h" #include "lst.h" #include "pathnames.h" /* The following array is used to make a fast determination of which * characters are interpreted specially by the shell. If a command * contains any of these characters, it is executed by the shell, not * directly by us. */ static char meta[256]; static GNode *ENDNode; static void CompatInterrupt(int); static int CompatRunCommand(LstNode, void *); static void CompatMake(void *, void *); static int shellneed(char **); static volatile sig_atomic_t interrupted; static void CompatInterrupt(int signo) { if (interrupted != SIGINT) interrupted = signo; } /*- *----------------------------------------------------------------------- * shellneed -- * * Results: * Returns 1 if a specified set of arguments * must be executed by the shell, * 0 if it can be run via execve, and -1 if the command can be * handled internally * * Side Effects: * May modify the process umask *----------------------------------------------------------------------- */ static int shellneed(char **av) { char *runsh[] = { "alias", "cd", "eval", "exec", "exit", "read", "set", "ulimit", "unalias", "unset", "wait", NULL }; char **p; /* FIXME most of these ARE actual no-ops */ for (p = runsh; *p; p++) if (strcmp(av[0], *p) == 0) return 1; if (strcmp(av[0], "umask") == 0) { long umi; char *ep = NULL; mode_t um; if (av[1] != NULL) { umi = strtol(av[1], &ep, 8); if (ep == NULL) return 1; um = umi; } else { um = umask(0); printf("%o\n", um); } (void)umask(um); return -1; } return 0; } /*- *----------------------------------------------------------------------- * CompatRunCommand -- * Execute the next command for a target. If the command returns an * error, the node's made field is set to ERROR and creation stops. * * Results: * 0 in case of error, 1 if ok. * * Side Effects: * The node's 'made' field may be set to ERROR. *----------------------------------------------------------------------- */ static int CompatRunCommand(LstNode cmdNode,/* Command to execute */ void *gnp) /* Node from which the command came */ { char *cmdStart; /* Start of expanded command */ char *cp, *bp = NULL; bool silent, /* Don't print command */ doExecute; /* Execute the command */ volatile bool errCheck; /* Check errors */ int reason; /* Reason for child's death */ int status; /* Description of child's death */ pid_t cpid; /* Child actually found */ pid_t stat; /* Status of fork */ char ** volatile av; /* Argument vector for thing to exec */ int argc; /* Number of arguments in av or 0 if not * dynamically allocated */ bool local; /* true if command should be executed * locally */ char *cmd = (char *)Lst_Datum(cmdNode); GNode *gn = (GNode *)gnp; static char *shargv[4] = { _PATH_BSHELL }; silent = gn->type & OP_SILENT; errCheck = !(gn->type & OP_IGNORE); doExecute = !noExecute; cmdStart = Var_Subst(cmd, &gn->context, false); /* brk_string will return an argv with a NULL in av[0], thus causing * execvp to choke and die horribly. Besides, how can we execute a null * command? In any case, we warn the user that the command expanded to * nothing (is this the right thing to do?). */ if (*cmdStart == '\0') { free(cmdStart); Error("%s expands to empty string", cmd); return 1; } else cmd = cmdStart; Lst_Replace(cmdNode, cmdStart); if ((gn->type & OP_SAVE_CMDS) && (gn != ENDNode)) { Lst_AtEnd(&ENDNode->commands, cmdStart); return 1; } else if (strcmp(cmdStart, "...") == 0) { gn->type |= OP_SAVE_CMDS; return 1; } for (;; cmd++) { if (*cmd == '@') silent = DEBUG(LOUD) ? false : true; else if (*cmd == '-') errCheck = false; else if (*cmd == '+') doExecute = true; else break; } while (isspace(*cmd)) cmd++; /* Search for meta characters in the command. If there are no meta * characters, there's no need to execute a shell to execute the * command. */ for (cp = cmd; !meta[(unsigned char)*cp]; cp++) { continue; } /* Print the command before echoing if we're not supposed to be quiet for * this one. We also print the command if -n given. */ if (!silent || noExecute) { printf("%s\n", cmd); fflush(stdout); } /* If we're not supposed to execute any commands, this is as far as * we go... */ if (!doExecute) return 1; if (*cp != '\0') { /* If *cp isn't the null character, we hit a "meta" character and * need to pass the command off to the shell. We give the shell the * -e flag as well as -c if it's supposed to exit when it hits an * error. */ shargv[1] = errCheck ? "-ec" : "-c"; shargv[2] = cmd; shargv[3] = NULL; av = shargv; argc = 0; } else { /* No meta-characters, so probably no need to exec a shell. * Break the command into words to form an argument vector * we can execute. */ av = brk_string(cmd, &argc, &bp); switch (shellneed(av)) { case -1: /* handled internally */ free(bp); free(av); return 1; case 1: shargv[1] = errCheck ? "-ec" : "-c"; shargv[2] = cmd; shargv[3] = NULL; free(av); free(bp); bp = NULL; av = shargv; argc = 0; break; default: /* nothing needed */ break; } } local = true; /* Fork and execute the single command. If the fork fails, we abort. */ cpid = fork(); if (cpid == -1) Fatal("Could not fork"); if (cpid == 0) { if (local) { execvp(av[0], av); if (errno == ENOENT) fprintf(stderr, "%s: not found\n", av[0]); else perror(av[0]); } else (void)execv(av[0], av); _exit(1); } if (bp) { free(av); free(bp); } free(cmdStart); Lst_Replace(cmdNode, NULL); /* The child is off and running. Now all we can do is wait... */ while (1) { while ((stat = wait(&reason)) != cpid) { if (stat == -1 && errno != EINTR) break; } if (interrupted) break; if (stat != -1) { if (WIFSTOPPED(reason)) status = WSTOPSIG(reason); /* stopped */ else if (WIFEXITED(reason)) { status = WEXITSTATUS(reason); /* exited */ if (status != 0) printf("*** Error code %d", status); } else { status = WTERMSIG(reason); /* signaled */ printf("*** Signal %d", status); } if (!WIFEXITED(reason) || status != 0) { if (errCheck) { gn->made = ERROR; if (keepgoing) /* Abort the current target, but let others * continue. */ printf(" (continuing)\n"); } else { /* Continue executing commands for this target. * If we return 0, this will happen... */ printf(" (ignored)\n"); status = 0; } } return !status; } else Fatal("error in wait: %d", stat); /*NOTREACHED*/ } /* This is reached only if interrupted */ if (!Targ_Precious(gn)) { char *file = Varq_Value(TARGET_INDEX, gn); if (!noExecute && eunlink(file) != -1) Error("*** %s removed\n", file); } if (interrupted == SIGINT) { GNode *i = Targ_FindNode(".INTERRUPT", TARG_NOCREATE); signal(SIGINT, SIG_IGN); signal(SIGTERM, SIG_IGN); signal(SIGHUP, SIG_IGN); signal(SIGQUIT, SIG_IGN); interrupted = 0; if (i != NULL) Lst_ForEachNodeWhile(&i->commands, CompatRunCommand, i); exit(SIGINT); } exit(interrupted); } /*- *----------------------------------------------------------------------- * CompatMake -- * Make a target. * * Side Effects: * If an error is detected and not being ignored, the process exits. *----------------------------------------------------------------------- */ static void CompatMake(void *gnp, /* The node to make */ void *pgnp) /* Parent to abort if necessary */ { GNode *gn = (GNode *)gnp; GNode *pgn = (GNode *)pgnp; if (pgn->type & OP_MADE) { (void)Dir_MTime(gn); gn->made = UPTODATE; } if (gn->type & OP_USE) { Make_HandleUse(gn, pgn); } else if (gn->made == UNMADE) { /* First mark ourselves to be made, then apply whatever transformations * the suffix module thinks are necessary. Once that's done, we can * descend and make all our children. If any of them has an error * but the -k flag was given, our 'make' field will be set false again. * This is our signal to not attempt to do anything but abort our * parent as well. */ gn->make = true; gn->made = BEINGMADE; Suff_FindDeps(gn); Lst_ForEach(&gn->children, CompatMake, gn); if (!gn->make) { gn->made = ABORTED; pgn->make = false; return; } if (Lst_Member(&gn->iParents, pgn) != NULL) { Varq_Set(IMPSRC_INDEX, Varq_Value(TARGET_INDEX, gn), pgn); } /* All the children were made ok. Now cmtime contains the modification * time of the newest child, we need to find out if we exist and when * we were modified last. The criteria for datedness are defined by the * Make_OODate function. */ if (DEBUG(MAKE)) printf("Examining %s...", gn->name); if (! Make_OODate(gn)) { gn->made = UPTODATE; if (DEBUG(MAKE)) printf("up-to-date.\n"); return; } else if (DEBUG(MAKE)) printf("out-of-date.\n"); /* If the user is just seeing if something is out-of-date, exit now * to tell him/her "yes". */ if (queryFlag) exit(-1); /* We need to be re-made. We also have to make sure we've got a $? * variable. To be nice, we also define the $> variable using * Make_DoAllVar(). */ Make_DoAllVar(gn); /* Alter our type to tell if errors should be ignored or things * should not be printed so CompatRunCommand knows what to do. */ if (Targ_Ignore(gn)) gn->type |= OP_IGNORE; if (Targ_Silent(gn)) gn->type |= OP_SILENT; if (Job_CheckCommands(gn, Fatal)) { /* Our commands are ok, but we still have to worry about the -t * flag... */ if (!touchFlag) Lst_ForEachNodeWhile(&gn->commands, CompatRunCommand, gn); else Job_Touch(gn, gn->type & OP_SILENT); } else gn->made = ERROR; if (gn->made != ERROR) { /* If the node was made successfully, mark it so, update * its modification time and timestamp all its parents. Note * that for .ZEROTIME targets, the timestamping isn't done. * This is to keep its state from affecting that of its parent. */ gn->made = MADE; #ifndef RECHECK /* We can't re-stat the thing, but we can at least take care of * rules where a target depends on a source that actually creates * the target, but only if it has changed, e.g. * * parse.h : parse.o * * parse.o : parse.y * yacc -d parse.y * cc -c y.tab.c * mv y.tab.o parse.o * cmp -s y.tab.h parse.h || mv y.tab.h parse.h * * In this case, if the definitions produced by yacc haven't * changed from before, parse.h won't have been updated and * gn->mtime will reflect the current modification time for * parse.h. This is something of a kludge, I admit, but it's a * useful one.. * * XXX: People like to use a rule like * * FRC: * * To force things that depend on FRC to be made, so we have to * check for gn->children being empty as well... */ if (!Lst_IsEmpty(&gn->commands) || Lst_IsEmpty(&gn->children)) gn->mtime = now; #else /* This is what Make does and it's actually a good thing, as it * allows rules like * * cmp -s y.tab.h parse.h || cp y.tab.h parse.h * * to function as intended. Unfortunately, thanks to the stateless * nature of NFS (and the speed of this program), there are times * when the modification time of a file created on a remote * machine will not be modified before the stat() implied by * the Dir_MTime occurs, thus leading us to believe that the file * is unchanged, wreaking havoc with files that depend on this one. * * I have decided it is better to make too much than to make too * little, so this stuff is commented out unless you're sure it's * ok. * -- ardeb 1/12/88 */ if (noExecute || is_out_of_date(Dir_MTime(gn))) gn->mtime = now; if (is_strictly_before(gn->mtime, gn->cmtime)) gn->mtime = gn->cmtime; if (DEBUG(MAKE)) printf("update time: %s\n", Targ_FmtTime(gn->mtime)); #endif if (!(gn->type & OP_EXEC)) { pgn->childMade = true; Make_TimeStamp(pgn, gn); } } else if (keepgoing) pgn->make = false; else { if (gn->lineno) printf("\n\nStop in %s (line %lu of %s).\n", Var_Value(".CURDIR"), (unsigned long)gn->lineno, gn->fname); else printf("\n\nStop in %s.\n", Var_Value(".CURDIR")); exit(1); } } else if (gn->made == ERROR) /* Already had an error when making this beastie. Tell the parent * to abort. */ pgn->make = false; else { if (Lst_Member(&gn->iParents, pgn) != NULL) { Varq_Set(IMPSRC_INDEX, Varq_Value(TARGET_INDEX, gn), pgn); } switch (gn->made) { case BEINGMADE: Error("Graph cycles through %s\n", gn->name); gn->made = ERROR; pgn->make = false; break; case MADE: if ((gn->type & OP_EXEC) == 0) { pgn->childMade = true; Make_TimeStamp(pgn, gn); } break; case UPTODATE: if ((gn->type & OP_EXEC) == 0) Make_TimeStamp(pgn, gn); break; default: break; } } } void Compat_Run(Lst targs) /* List of target nodes to re-create */ { char *cp; /* Pointer to string of shell meta-characters */ GNode *gn = NULL; /* Current root target */ int errors; /* Number of targets not remade due to errors */ signal(SIGINT, CompatInterrupt); signal(SIGTERM, CompatInterrupt); signal(SIGHUP, CompatInterrupt); signal(SIGQUIT, CompatInterrupt); for (cp = "#=|^(){};&<>*?[]:$`\\\n"; *cp != '\0'; cp++) meta[(unsigned char) *cp] = 1; /* The null character serves as a sentinel in the string. */ meta[0] = 1; ENDNode = Targ_FindNode(".END", TARG_CREATE); /* If the user has defined a .BEGIN target, execute the commands attached * to it. */ if (!queryFlag) { gn = Targ_FindNode(".BEGIN", TARG_NOCREATE); if (gn != NULL) { Lst_ForEachNodeWhile(&gn->commands, CompatRunCommand, gn); if (gn->made == ERROR) { printf("\n\nStop.\n"); exit(1); } } } /* For each entry in the list of targets to create, call CompatMake on * it to create the thing. CompatMake will leave the 'made' field of gn * in one of several states: * UPTODATE gn was already up-to-date * MADE gn was recreated successfully * ERROR An error occurred while gn was being created * ABORTED gn was not remade because one of its inferiors * could not be made due to errors. */ errors = 0; while ((gn = (GNode *)Lst_DeQueue(targs)) != NULL) { CompatMake(gn, gn); if (gn->made == UPTODATE) printf("`%s' is up to date.\n", gn->name); else if (gn->made == ABORTED) { printf("`%s' not remade because of errors.\n", gn->name); errors += 1; } } /* If the user has defined a .END target, run its commands. */ if (errors == 0) Lst_ForEachNodeWhile(&ENDNode->commands, CompatRunCommand, ENDNode); }