Hi Linus,
Below is a patch which makes it possible for binfmt_misc to optionally
preserve the contents of argv[1]. This is needed for building
accurate simulators which are invoked via binfmt_misc. I had brought
up this patch a while ago (see URL below) and there was no negative
feedback (OK, there was no feedback at all... ;-).
The patch is trivial and the new behavior is triggered only if the
letter "P" (for "preserve") is appended to the binfmt_misc
registration string, so it shold be completely safe.
Thanks,
--david
http://groups.google.com/groups?q=mosberger+binfmt_misc&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=200209092241.g89MfPS5001013%40napali.hpl.hp.com&rnum=1
diff -Nru a/fs/binfmt_misc.c b/fs/binfmt_misc.c
--- a/fs/binfmt_misc.c Tue Sep 24 22:09:20 2002
+++ b/fs/binfmt_misc.c Tue Sep 24 22:09:20 2002
@@ -36,6 +36,7 @@
static int enabled = 1;
enum {Enabled, Magic};
+#define MISC_FMT_PRESERVE_ARGV0 (1<<31)
typedef struct {
struct list_head list;
@@ -124,7 +125,9 @@
bprm->file = NULL;
/* Build args for interpreter */
- remove_arg_zero(bprm);
+ if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) {
+ remove_arg_zero(bprm);
+ }
retval = copy_strings_kernel(1, &bprm->filename, bprm);
if (retval < 0) goto _ret;
bprm->argc++;
@@ -289,6 +292,11 @@
*p++ = '\0';
if (!e->interpreter[0])
goto Einval;
+
+ if (*p == 'P') {
+ p++;
+ e->flags |= MISC_FMT_PRESERVE_ARGV0;
+ }
if (*p == '\n')
p++;