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[unix-history] / usr / src / usr.bin / make / compat.c
/*
* 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.
*
* %sccs.include.redist.c%
*/
#ifndef lint
static char sccsid[] = "@(#)compat.c 5.7 (Berkeley) %G%";
#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);
}
\f
/*-
*-----------------------------------------------------------------------
* 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...
*/
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.
*/
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", stat);
/*NOTREACHED*/
}
}
return (status);
}
\f
/*-
*-----------------------------------------------------------------------
* CompatMake --
* Make a target.
*
* Results:
* 0
*
* Side Effects:
* If an error is detected and not being ignored, the process exits.
*
*-----------------------------------------------------------------------
*/
static int
CompatMake (gn, pgn)
GNode *gn; /* The node to make */
GNode *pgn; /* Parent to abort if necessary */
{
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, (ClientData)gn);
if (!gn->make) {
gn->made = ABORTED;
pgn->make = FALSE;
return (0);
}
if (Lst_Member (gn->iParents, pgn) != NILLNODE) {
Var_Set (IMPSRC, Var_Value(TARGET, 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 (0);
} 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) {
curTarg = gn;
Lst_ForEach (gn->commands, CompatRunCommand, (ClientData)gn);
curTarg = NILGNODE;
} 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 (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 {
printf ("\n\nStop.\n");
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) != NILLNODE) {
Var_Set (IMPSRC, Var_Value(TARGET, 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;
}
}
return (0);
}
\f
/*-
*-----------------------------------------------------------------------
* Compat_Run --
* Initialize this mode and start making.
*
* Results:
* None.
*
* Side Effects:
* Guess what?
*
*-----------------------------------------------------------------------
*/
void
Compat_Run(targs)
Lst targs; /* List of target nodes to re-create */
{
char *cp; /* Pointer to string of shell meta-characters */
GNode *gn; /* Current root target */
int errors; /* Number of targets not remade due to errors */
if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
signal(SIGINT, CompatInterrupt);
}
if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
signal(SIGTERM, CompatInterrupt);
}
if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
signal(SIGHUP, CompatInterrupt);
}
if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) {
signal(SIGQUIT, CompatInterrupt);
}
for (cp = "#=|^(){};&<>*?[]:$`\\\n"; *cp != '\0'; cp++) {
meta[*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 != NILGNODE) {
Lst_ForEach(gn->commands, CompatRunCommand, (ClientData)gn);
}
}
/*
* 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 = (GNode *) 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, CompatRunCommand, (ClientData)gn);
}
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.