1/* This file is used to build libdl.so with stub versions of `dlopen`, `dlsym`,
2 * etc. The intention is that this stubbed libdl.so can be used to build
3 * libraries and applications which use `dlopen` without committing to a
4 * specific runtime implementation. Later, it can be replaced with a real,
5 * working libdl.so (e.g. at runtime or component composition time).
6 *
7 * For example, the `wasm-tools component link` subcommand can be used to create
8 * a component that bundles any `dlopen`-able libraries in such a way that their
9 * function exports can be resolved symbolically at runtime using an
10 * implementation of libdl.so designed for that purpose. In other cases, a
11 * runtime might provide Emscripten-style dynamic linking via URLs or else a
12 * more traditional, filesystem-based implementation. Finally, even this
13 * stubbed version of libdl.so can be used at runtime in cases where dynamic
14 * library resolution cannot or should not be supported (and the application can
15 * handle this situation gracefully). */
16
17#include <stddef.h>
18#include <dlfcn.h>
19
20static const char *error = NULL;
21
22weak int dlclose(void *library)
23{
24 error = "dlclose not implemented";
25 return -1;
26}
27
28weak char *dlerror(void)
29{
30 const char *var = error;
31 error = NULL;
32 return (char*) var;
33}
34
35weak void *dlopen(const char *name, int flags)
36{
37 error = "dlopen not implemented";
38 return NULL;
39}
40
41weak void *dlsym(void *library, const char *name)
42{
43 error = "dlsym not implemented";
44 return NULL;
45}