compat.c

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/*
 * Copyright (c) 1988, 1989, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 * 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.
 */

#ifndef lint
static char sccsid[] = "@(#)compat.c	8.2 (Berkeley) 3/19/94";
#endif /* not lint */

/*-
 * 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    <sys/types.h>
#include    <sys/stat.h>
#include    <sys/wait.h>

#include    <ctype.h>
#include    <errno.h>
#include    <signal.h>
#include    <stdio.h>

#include    "make.h"
#include    "hash.h"
#include    "dir.h"
#include    "job.h"
extern int errno;

/*
 * 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 = NILGNODE;
static GNode	    *ENDNode;
static void CompatInterrupt __P((int));
static int CompatRunCommand __P((char *, GNode *));
static int CompatMake __P((GNode *, GNode *));

/*-
 *-----------------------------------------------------------------------
 * 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 (signo)
    int	    signo;
{
    struct stat sb;
    GNode   *gn;
    
    if ((curTarg != NILGNODE) && !Targ_Precious (curTarg)) {
	char 	  *file = Var_Value (TARGET, curTarg);

	if (!stat(file, &sb) && S_ISREG(sb.st_mode) &&
	    unlink (file) == SUCCESS) {
	    printf ("*** %s removed\n", file);
	}

	/*
	 * Run .INTERRUPT only if hit with interrupt signal
	 */
	if (signo == SIGINT) {
	    gn = Targ_FindNode(".INTERRUPT", TARG_NOCREATE);
	    if (gn != NILGNODE) {
		Lst_ForEach(gn->commands, CompatRunCommand, (ClientData)gn);
	    }
	}
    }
    exit (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 if the command succeeded, 1 if an error occurred.
 *
 * Side Effects:
 *	The node's 'made' field may be set to ERROR.
 *
 *-----------------------------------------------------------------------
 */
static int
CompatRunCommand (cmd, gn)
    char    	  *cmd;	    	/* Command to execute */
    GNode   	  *gn;    	/* Node from which the command came */
{
    char    	  *cmdStart;	/* Start of expanded command */
    register char *cp;
    Boolean 	  silent,   	/* Don't print command */
		  errCheck; 	/* Check errors */
    union wait 	  reason;   	/* Reason for child's death */
    int	    	  status;   	/* Description of child's death */
    int	    	  cpid;	    	/* Child actually found */
    ReturnStatus  stat;	    	/* 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 */
    Boolean 	  local;    	/* TRUE if command should be executed
				 * locally */

    /*  
     * 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);

    cmdNode = Lst_Member (gn->commands, (ClientData)cmd);
    cmdStart = Var_Subst (NULL, cmd, gn, FALSE);

    /*
     * brk_string will return an argv with a NULL in av[1], 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') {
	Error("%s expands to empty string", cmd);
	return(0);
    } else {
	cmd = cmdStart;
    }
    Lst_Replace (cmdNode, (ClientData)cmdStart);

    if ((gn->type & OP_SAVE_CMDS) && (gn != ENDNode)) {
	(void)Lst_AtEnd(ENDNode->commands, (ClientData)cmdStart);
	return(0);
    } else if (strcmp(cmdStart, "...") == 0) {
	gn->type |= OP_SAVE_CMDS;
	return(0);
    }

    while ((*cmd == '@') || (*cmd == '-')) {
	if (*cmd == '@') {
	    silent = TRUE;
	} else {
	    errCheck = FALSE;
	}
	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.
     */
    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 (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] = { "/bin/sh" };

	shargv[1] = (errCheck ? "-ec" : "-c");
	shargv[2] = cmd;
	shargv[3] = (char *)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);
	av += 1;
    }
    
    local = TRUE;

    /*
     * Fork and execute the single command. If the fork fails, we abort.
     */
    cpid = vfork();
    if (cpid < 0) {
	Fatal("Could not fork");
    }
    if (cpid == 0) {
	if (local) {
	    execvp(av[0], av);
	    (void) write (2, av[0], strlen (av[0]));
	    (void) write (2, ": not found\n", sizeof(": not found"));
	} else {
	    (void)execv(av[0], av);
	}
	exit(1);
    }
    
    /*
     * The child is off and running. Now all we can do is wait...
     */
    while (1) {
	int 	  id;

	if (!local) {
	    id = 0;
	}

	while ((stat = wait((int *)&reason)) != cpid) {
	    if (stat == -1 && errno != EINTR) {
		break;
	    }
	}
	
	if (stat > -1) {
	    if (WIFSTOPPED(reason)) {
		status = reason.w_stopval;		/* stopped */
	    } else if (WIFEXITED(reason)) {
		status = reason.w_retcode;		/* exited */
		if (status != 0) {
		    printf ("*** Error code %d", status);
		}
	    } else {
		status = reason.w_termsig;		/* 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.
			 */