[PATCH] fix dlerror when using dlopen with a static libc

[PATCH] fix dlerror when using dlopen with a static libc

[Clément Vasseur]

when the dynamic loader is disabled, dlopen fails correctly but dlerror
did not return a human readable error string like it should have.
---
 src/ldso/dynlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 12f14f7..aa1b99a 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -1603,6 +1603,8 @@ static int invalid_dso_handle(void *h)
 }
 void *dlopen(const char *file, int mode)
 {
+	strcpy(errbuf, "Dynamic loading not supported");
+	errflag = 1;
 	return 0;
 }
 void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
-- 
2.0.1

Re: [PATCH] fix dlerror when using dlopen with a static libc

[Rich Felker]

On Thu, Aug 07, 2014 at 05:49:29PM +0200, Clément Vasseur wrote:
> when the dynamic loader is disabled, dlopen fails correctly but dlerror
> did not return a human readable error string like it should have.

Committed. I also followed up with a related change for dlsym (which
could legitimately be used, even if dlopen never succeeds, to search
for symbols in the global namespace or RTLD_NEXT).

Rich