> On Aug 26, 2021, at 10:48 PM, Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
> 
> On 8/26/21 11:12 PM, imp@bsdimp.com wrote:
>> From: Colin Percival <cperciva@tarsnap.com>
>> 
>> 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>
>> ---
>> bsd-user/main.c | 5 +++++
>> 1 file changed, 5 insertions(+)
>> 
>> diff --git a/bsd-user/main.c b/bsd-user/main.c
>> index b35bcf4d1e..ae25f4c773 100644
>> --- a/bsd-user/main.c
>> +++ b/bsd-user/main.c
>> @@ -268,6 +268,7 @@ 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();
>> 
>> @@ -390,6 +391,8 @@ 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();
>>         }
>> @@ -413,6 +416,8 @@ int main(int argc, char **argv)
>>         usage();
>>     }
>>     filename = argv[optind];
>> +    if (argv0)
> 
> Style:
> 
> {
> 
>> +        argv[optind] = argv0;
> 
> }

Done in v3.

Warner

> 
>> 
>>     if (!trace_init_backends()) {
>>         exit(1);