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compat.c
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1993-09-23
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/*
* 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. 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 5.7 (Berkeley) 3/1/91";
#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 <stdio.h>
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/wait.h>
#include <sys/errno.h>
#include <ctype.h>
#include "make.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 int CompatRunCommand();
/*-
*-----------------------------------------------------------------------
* 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;
{
GNode *gn;
if ((curTarg != NILGNODE) && !Targ_Precious (curTarg)) {
char *file = Var_Value (TARGET, curTarg);
if (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 */
int numWritten; /* Number of bytes written for error message */
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 */
silent = gn->type & OP_SILENT;
errCheck = !(gn->type & OP_IGNORE);
cmdNode = Lst_Member (gn->commands, (ClientData)cmd);
cmdStart = Var_Subst (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++;
}
/*
* 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[*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);
numWritten = write (2, av[0], strlen (av[0]));
numWritten = 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...
*/