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From f3055e0163aad1cebb0867078643b36643c5d95f Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Tue, 4 Jul 2017 16:58:28 -0400
Subject: [PATCH 54/54] 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.
---
ldso/dynlink.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index fc6a68b8..35a90aef 100644
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -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);
--
2.13.1
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