/* * Copyright (c) 1988, 1989, 1990, 1993 * The Regents of the University of California. All rights reserved. * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. * * @(#)compat.c 8.2 (Berkeley) 3/19/94 */ #include __FBSDID("$FreeBSD$"); /*- * compat.c -- * The routines in this file implement the full-compatibility * mode of PMake. Most of the special functionality of PMake * is available in this mode. Things not supported: * - different shells. * - friendly variable substitution. * * Interface: * Compat_Run Initialize things for this module and recreate * thems as need creatin' */ #include #include #include #include #include #include #include #include #include "make.h" #include "hash.h" #include "dir.h" #include "job.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 *curTarg = NULL; static GNode *ENDNode; static sig_atomic_t interrupted; static void CompatInterrupt(int); static int CompatMake(void *, void *); static int shellneed(char *); static char *sh_builtin[] = { "alias", "cd", "eval", "exec", "exit", "read", "set", "ulimit", "unalias", "umask", "unset", "wait", ":", 0}; static void CompatInit(void) { char *cp; /* Pointer to string of shell meta-characters */ for (cp = "#=|^(){};&<>*?[]:$`\\\n"; *cp != '\0'; cp++) { meta[(unsigned char)*cp] = 1; } /* * The null character serves as a sentinel in the string. */ meta[0] = 1; } /* * Interrupt handler - set flag and defer handling to the main code */ static void CompatCatchSig(int signo) { interrupted = signo; } /*- *----------------------------------------------------------------------- * CompatInterrupt -- * Interrupt the creation of the current target and remove it if * it ain't precious. * * Results: * None. * * Side Effects: * The target is removed and the process exits. If .INTERRUPT exists, * its commands are run first WITH INTERRUPTS IGNORED.. * *----------------------------------------------------------------------- */ static void CompatInterrupt (int signo) { GNode *gn; sigset_t nmask, omask; sigemptyset(&nmask); sigaddset(&nmask, SIGINT); sigaddset(&nmask, SIGTERM); sigaddset(&nmask, SIGHUP); sigaddset(&nmask, SIGQUIT); sigprocmask(SIG_SETMASK, &nmask, &omask); /* prevent recursion in evaluation of .INTERRUPT */ interrupted = 0; if ((curTarg != NULL) && !Targ_Precious(curTarg)) { char *p1; char *file = Var_Value(TARGET, curTarg, &p1); if (!noExecute && eunlink(file) != -1) { printf("*** %s removed\n", file); } free(p1); } /* * Run .INTERRUPT only if hit with interrupt signal */ if (signo == SIGINT) { gn = Targ_FindNode(".INTERRUPT", TARG_NOCREATE); if (gn != NULL) { Lst_ForEach(gn->commands, Compat_RunCommand, (void *)gn); } } sigprocmask(SIG_SETMASK, &omask, NULL); if (signo == SIGQUIT) exit(signo); signal(signo, SIG_DFL); kill(getpid(), signo); } /*- *----------------------------------------------------------------------- * shellneed -- * * Results: * Returns 1 if a specified line must be executed by the shell, * 0 if it can be run via execve, and -1 if the command is a no-op. * * Side Effects: * None. * *----------------------------------------------------------------------- */ static int shellneed (char *cmd) { char **av, **p; int ac; av = brk_string(cmd, &ac, TRUE); for(p = sh_builtin; *p != 0; p++) if (strcmp(av[1], *p) == 0) return (1); return (0); } /*- *----------------------------------------------------------------------- * Compat_RunCommand -- * 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. * The node from which the command came is also given. * * Results: * 0 if the command succeeded, 1 if an error occurred. * * Side Effects: * The node's 'made' field may be set to ERROR. * *----------------------------------------------------------------------- */ int Compat_RunCommand(void *cmdp, void *gnp) { char *cmdStart; /* Start of expanded command */ char *cp; Boolean silent, /* Don't print command */ doit, /* Execute even in -n */ errCheck; /* Check errors */ int reason; /* Reason for child's death */ int status; /* Description of child's death */ int cpid; /* Child actually found */ ReturnStatus rstat; /* Status of fork */ LstNode *cmdNode; /* Node where current command is located */ char **av; /* Argument vector for thing to exec */ int argc; /* Number of arguments in av or 0 if not * dynamically allocated */ int internal; /* Various values.. */ char *cmd = cmdp; GNode *gn = gnp; /* * Avoid clobbered variable warnings by forcing the compiler * to ``unregister'' variables */ #if __GNUC__ (void) &av; (void) &errCheck; #endif silent = gn->type & OP_SILENT; errCheck = !(gn->type & OP_IGNORE); doit = FALSE; cmdNode = Lst_Member(gn->commands, cmd); cmdStart = Var_Subst(NULL, cmd, gn, 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 (0); } else { cmd = cmdStart; } Lst_Replace (cmdNode, cmdStart); if ((gn->type & OP_SAVE_CMDS) && (gn != ENDNode)) { Lst_AtEnd(ENDNode->commands, cmdStart); return (0); } else if (strcmp(cmdStart, "...") == 0) { gn->type |= OP_SAVE_CMDS; return (0); } while ((*cmd == '@') || (*cmd == '-') || (*cmd == '+')) { switch (*cmd) { case '@': silent = DEBUG(LOUD) ? FALSE : TRUE; break; case '-': errCheck = FALSE; break; case '+': doit = TRUE; if (!meta[0]) /* we came here from jobs */ CompatInit(); break; } cmd++; } while (isspace((unsigned char)*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, but not if '+'. */ if (!silent || (noExecute && !doit)) { printf("%s\n", cmd); fflush(stdout); } /* * If we're not supposed to execute any commands, this is as far as * we go... */ if (!doit && noExecute) { return (0); } 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. */ static char *shargv[4]; shargv[0] = shellPath; shargv[1] = (errCheck ? "-ec" : "-c"); shargv[2] = cmd; shargv[3] = NULL; av = shargv; argc = 0; } else if ((internal = shellneed(cmd))) { /* * This command must be passed by the shell for other reasons.. * or.. possibly not at all. */ static char *shargv[4]; if (internal == -1) { /* Command does not need to be executed */ return (0); } shargv[0] = shellPath; shargv[1] = (errCheck ? "-ec" : "-c"); shargv[2] = cmd; shargv[3] = NULL; av = shargv; argc = 0; } else { /* * No meta-characters, so no need to exec a shell. Break the command * into words to form an argument vector we can execute. * brk_string sticks our name in av[0], so we have to * skip over it... */ av = brk_string(cmd, &argc, TRUE); av += 1; } /* * Fork and execute the single command. If the fork fails, we abort. */ cpid = vfork(); if (cpid < 0) { Fatal("Could not fork"); } if (cpid == 0) { execvp(av[0], av); write(STDERR_FILENO, av[0], strlen (av[0])); write(STDERR_FILENO, ":", 1); write(STDERR_FILENO, strerror(errno), strlen(strerror(errno))); write(STDERR_FILENO, "\n", 1); exit(1); } /* * we need to print out the command associated with this Gnode in * Targ_PrintCmd from Targ_PrintGraph when debugging at level g2, * in main(), Fatal() and DieHorribly(), therefore do not free it * when debugging. */ if (!DEBUG(GRAPH2)) { free(cmdStart); Lst_Replace(cmdNode, cmdp); } /* * The child is off and running. Now all we can do is wait... */ while (1) { while ((rstat = wait(&reason)) != cpid) { if (interrupted || (rstat == -1 && errno != EINTR)) { break; } } if (interrupted) CompatInterrupt(interrupted); if (rstat > -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; } } break; } else { Fatal("error in wait: %d", rstat); /*NOTREACHED*/ } } return (status); } /*- *----------------------------------------------------------------------- * CompatMake -- * Make a target, given the parent, to abort if necessary. * * Results: * 0 * * Side Effects: * If an error is detected and not being ignored, the process exits. * *----------------------------------------------------------------------- */ static int CompatMake(void *gnp, void *pgnp) { GNode *gn = gnp; GNode *pgn = pgnp; 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 (0); } if (Lst_Member(gn->iParents, pgn) != NULL) { char *p1; Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), pgn); free(p1); } /* * 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. */ DEBUGF(MAKE, ("Examining %s...", gn->name)); if (!Make_OODate(gn)) { gn->made = UPTODATE; DEBUGF(MAKE, ("up-to-date.\n")); return (0); } else { DEBUGF(MAKE, ("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 Compat_RunCommand 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) { curTarg = gn; Lst_ForEach(gn->commands, Compat_RunCommand, (void *)gn); curTarg = NULL; } 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 || Dir_MTime(gn) == 0) { gn->mtime = now; } if (gn->cmtime > gn->mtime) gn->mtime = gn->cmtime; DEBUGF(MAKE, ("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 { char *p1; printf("\n\nStop in %s.\n", Var_Value(".CURDIR", gn, &p1)); free(p1); 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) { char *p1; Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), pgn); free(p1); } 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; } } return (0); } /*- *----------------------------------------------------------------------- * Compat_Run -- * Start making again, given a list of target nodes. * * Results: * None. * * Side Effects: * Guess what? * *----------------------------------------------------------------------- */ void Compat_Run(Lst *targs) { GNode *gn = NULL;/* Current root target */ int errors; /* Number of targets not remade due to errors */ CompatInit(); Shell_Init(); /* Set up shell. */ if (signal(SIGINT, SIG_IGN) != SIG_IGN) { signal(SIGINT, CompatCatchSig); } if (signal(SIGTERM, SIG_IGN) != SIG_IGN) { signal(SIGTERM, CompatCatchSig); } if (signal(SIGHUP, SIG_IGN) != SIG_IGN) { signal(SIGHUP, CompatCatchSig); } if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) { signal(SIGQUIT, CompatCatchSig); } 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_ForEach(gn->commands, Compat_RunCommand, 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 (!Lst_IsEmpty(targs)) { gn = Lst_DeQueue(targs); 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_ForEach(ENDNode->commands, Compat_RunCommand, gn); } }