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Make argv construction code reentrant.

This commit is contained in:
kleink 1999-02-04 18:17:16 +00:00
parent 0aa500a352
commit 0d5bfdd00f
1 changed files with 10 additions and 15 deletions
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21
lib/libc/gen/execvp.c
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@ -1,4 +1,4 @@
/* $NetBSD: execvp.c,v 1.10 1998/11/12 16:09:46 christos Exp $ */
/* $NetBSD: execvp.c,v 1.11 1999/02/04 18:17:16 kleink Exp $ */
/*-
* Copyright (c) 1991, 1993
@ -38,7 +38,7 @@
#if 0
static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: execvp.c,v 1.10 1998/11/12 16:09:46 christos Exp $");
__RCSID("$NetBSD: execvp.c,v 1.11 1999/02/04 18:17:16 kleink Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
@ -66,8 +66,7 @@ execvp(name, argv)
const char *name;
char * const *argv;
{
static size_t memsize;
static const char **memp;
const char **memp;
int cnt;
size_t lp, ln;
char *p;
@ -133,20 +132,16 @@ retry: rwlock_rdlock(&__environ_lock);
case ENOENT:
break;
case ENOEXEC:
for (cnt = 0; argv[cnt]; ++cnt);
if ((cnt + 2) * sizeof(char *) > memsize) {
memsize = (cnt + 2) * sizeof(char *);
if ((memp = realloc(memp, memsize)) == NULL) {
memsize = 0;
for (cnt = 0; argv[cnt] != NULL; ++cnt);
if ((memp = malloc((cnt + 2) * sizeof (*memp))) == NULL)
goto done;
}
}
memp[0] = "sh";
memp[0] = _PATH_BSHELL;
memp[1] = bp;
memmove(memp + 2, argv + 1, cnt * sizeof(char *));
(void)memmove(&memp[2], &argv[1], cnt * sizeof (*memp));
rwlock_rdlock(&__environ_lock);
(void)execve(_PATH_BSHELL, (char * const *)memp, environ);
rwlock_unlock(&__environ_lock);
free(memp);
goto done;
case ETXTBSY:
if (etxtbsy < 3)