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linux-user: add support for passing contents of argv0 

Added switch -0 (zero) which can be used to pass argv[0] to
target process. The main use is for a binfmt_misc wrapper when
the "P - preserve-argv[0]" setting is used.

From: Mika Westerberg

Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7115 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2009-04-15 16:11:52 +00:00
parent 24e1003a52
commit 7d8cec95c8
1 changed files with 37 additions and 1 deletions
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38
linux-user/main.c
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@ -2215,6 +2215,7 @@ static void usage(void)
"-drop-ld-preload drop LD_PRELOAD for target process\n"
"-E var=value sets/modifies targets environment variable(s)\n"
"-U var unsets targets environment variable(s)\n"
"-0 argv0 forces target process argv[0] to be argv0\n"
"\n"
"Debug options:\n"
"-d options activate log (logfile=%s)\n"
@ -2266,7 +2267,11 @@ int main(int argc, char **argv, char **envp)
const char *r;
int gdbstub_port = 0;
char **target_environ, **wrk;
char **target_argv;
int target_argc;
envlist_t *envlist = NULL;
const char *argv0 = NULL;
int i;
if (argc <= 1)
usage();
@ -2323,6 +2328,9 @@ int main(int argc, char **argv, char **envp)
r = argv[optind++];
if (envlist_unsetenv(envlist, r) != 0)
usage();
} else if (!strcmp(r, "0")) {
r = argv[optind++];
argv0 = r;
} else if (!strcmp(r, "s")) {
if (optind >= argc)
break;
@ -2435,11 +2443,39 @@ int main(int argc, char **argv, char **envp)
target_environ = envlist_to_environ(envlist, NULL);
envlist_free(envlist);
if (loader_exec(filename, argv+optind, target_environ, regs, info) != 0) {
/*
* Prepare copy of argv vector for target.
*/
target_argc = argc - optind;
target_argv = calloc(target_argc + 1, sizeof (char *));
if (target_argv == NULL) {
(void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
exit(1);
}
/*
* If argv0 is specified (using '-0' switch) we replace
* argv[0] pointer with the given one.
*/
i = 0;
if (argv0 != NULL) {
target_argv[i++] = strdup(argv0);
}
for (; i < target_argc; i++) {
target_argv[i] = strdup(argv[optind + i]);
}
target_argv[target_argc] = NULL;
if (loader_exec(filename, target_argv, target_environ, regs, info) != 0) {
printf("Error loading %s\n", filename);
_exit(1);
}
for (i = 0; i < target_argc; i++) {
free(target_argv[i]);
}
free(target_argv);
for (wrk = target_environ; *wrk; wrk++) {
free(*wrk);
}