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bsd-user: Add '-0 argv0' option to bsd-user/main.c

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Previously it was impossible to emulate a program with a file name
different from its argv[0].  With this change, you can run
    qemu -0 fakename realname args
which runs the program "realname" with an argv of "fakename args".

Signed-off-by: Colin Percival <cperciva@tarsnap.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Colin Percival 2021-08-07 14:34:21 -06:00 committed by Warner Losh
parent 63cca1067a
commit b8012648b3
1 changed files with 6 additions and 0 deletions
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6
bsd-user/main.c
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@ -243,6 +243,7 @@ int main(int argc, char **argv)
char **target_environ, **wrk;
envlist_t *envlist = NULL;
bsd_type = HOST_DEFAULT_BSD_TYPE;
char *argv0 = NULL;
adjust_ssize();
@ -367,6 +368,8 @@ int main(int argc, char **argv)
do_strace = 1;
} else if (!strcmp(r, "trace")) {
trace_opt_parse(optarg);
} else if (!strcmp(r, "0")) {
argv0 = argv[optind++];
} else {
usage();
}
@ -390,6 +393,9 @@ int main(int argc, char **argv)
usage();
}
filename = argv[optind];
if (argv0) {
argv[optind] = argv0;
}
if (!trace_init_backends()) {
exit(1);