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Fix command hash handling on

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PATH=... command

Noted by and fix works for Marcel Moolenaar <marcel@scc.nl>
This commit is contained in:
Martin Cracauer 1999-12-20 13:42:59 +00:00
parent 97b45ce9c3
commit a436dc79f5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=54884
3 changed files with 29 additions and 3 deletions
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28
bin/sh/eval.c
View File

@ -612,12 +612,14 @@ evalcommand(cmd, flags, backcmd)
volatile int e;
char *lastarg;
int realstatus;
int do_clearcmdentry;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &argv;
(void) &argc;
(void) &lastarg;
(void) &flags;
(void) &do_clearcmdentry;
#endif
/* First expand the arguments. */
@ -626,6 +628,7 @@ evalcommand(cmd, flags, backcmd)
arglist.lastp = &arglist.list;
varlist.lastp = &varlist.list;
varflag = 1;
do_clearcmdentry = 0;
oexitstatus = exitstatus;
exitstatus = 0;
for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) {
@ -688,8 +691,29 @@ evalcommand(cmd, flags, backcmd)
* is present
*/
for (sp = varlist.list ; sp ; sp = sp->next)
if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0)
if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0) {
path = sp->text + sizeof(PATH) - 1;
/*
* On `PATH=... command`, we need to make
* sure that the command isn't using the
* non-updated hash table of the outer PATH
* setting and we need to make sure that
* the hash table isn't filled with items
* from the temporary setting.
*
* It would be better to forbit using and
* updating the table while this command
* runs, by the command finding mechanism
* is heavily integrated with hash handling,
* so we just delete the hash before and after
* the command runs. Partly deleting like
* changepatch() does doesn't seem worth the
* bookinging effort, since most such runs add
* diretories in front of the new PATH.
*/
clearcmdentry(0);
do_clearcmdentry = 1;
}
find_command(argv[0], &cmdentry, 1, path);
if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */
@ -887,6 +911,8 @@ evalcommand(cmd, flags, backcmd)
out:
if (lastarg)
setvar("_", lastarg, 0);
if (do_clearcmdentry)
clearcmdentry(0);
popstackmark(&smark);
}

3
bin/sh/exec.c
View File

@ -104,7 +104,6 @@ STATIC void tryexec __P((char *, char **, char **));
STATIC void execinterp __P((char **, char **));
#endif
STATIC void printentry __P((struct tblentry *, int));
STATIC void clearcmdentry __P((int));
STATIC struct tblentry *cmdlookup __P((char *, int));
STATIC void delete_cmd_entry __P((void));
@ -640,7 +639,7 @@ changepath(newval)
* PATH which has changed.
*/
STATIC void
void
clearcmdentry(firstchange)
int firstchange;
{

1
bin/sh/exec.h
View File

@ -69,3 +69,4 @@ void addcmdentry __P((char *, struct cmdentry *));
void defun __P((char *, union node *));
int unsetfunc __P((char *));
int typecmd __P((int, char **));
void clearcmdentry __P((int));