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allow specifying argv[0] when invoking a program via ldso command 

previously, the pathname used to load the program was always used as
argv[0]. the default remains the same, but a new --argv0 option can be
used to provide a different value.
This commit is contained in:
Rich Felker 2017-07-04 16:58:28 -04:00
parent 43c423af5b
commit f3055e0163
1 changed files with 7 additions and 0 deletions
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7
ldso/dynlink.c
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@ -1437,6 +1437,7 @@ _Noreturn void __dls3(size_t *sp)
size_t aux[AUX_CNT], *auxv;
size_t i;
char *env_preload=0;
char *replace_argv0=0;
size_t vdso_base;
int argc = *sp;
char **argv = (void *)(sp+1);
@ -1521,6 +1522,10 @@ _Noreturn void __dls3(size_t *sp)
if (opt[7]=='=') env_preload = opt+8;
else if (opt[7]) *argv = 0;
else if (*argv) env_preload = *argv++;
} else if (!memcmp(opt, "argv0", 5)) {
if (opt[5]=='=') replace_argv0 = opt+6;
else if (opt[5]) *argv = 0;
else if (*argv) replace_argv0 = *argv++;
} else {
argv[0] = 0;
}
@ -1677,6 +1682,8 @@ _Noreturn void __dls3(size_t *sp)
debug.state = 0;
_dl_debug_state();
if (replace_argv0) argv[0] = replace_argv0;
errno = 0;
CRTJMP((void *)aux[AT_ENTRY], argv-1);