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/* Copyright (c) 1993-2008 by Richard Kelsey and Jonathan Rees.
See file COPYING. */
/*
* Dynamically load external modules on machines that support it.
*/
#include "sysdep.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "scheme48.h"
#if defined(HAVE_DLOPEN)
#include <dlfcn.h>
#else
#include "fake/dlfcn.h"
#endif
#if defined(RTLD_NOW)
#define DLOPEN_MODE RTLD_NOW
#elif defined(RTLD_LAZY)
#define DLOPEN_MODE (RTLD_LAZY)
#else
#define DLOPEN_MODE (1)
#endif
static s48_value
shared_object_dlopen(s48_value name, s48_value complete_name_p)
{
S48_DECLARE_GC_PROTECT(1);
void *handle;
s48_value res;
s48_value full_name;
S48_GC_PROTECT_1(name);
if (!S48_EQ(S48_FALSE, complete_name_p))
{
size_t len = strlen(s48_extract_byte_vector(name));
full_name = s48_make_byte_vector(len + 4);
memcpy(s48_extract_byte_vector(full_name),
s48_extract_byte_vector(name),
len);
memcpy(s48_extract_byte_vector(full_name) + len,
".so",
4);
}
else
full_name = name;
handle = dlopen(s48_extract_byte_vector(full_name), DLOPEN_MODE);
if (handle == NULL)
s48_raise_string_os_error((char *)dlerror());
res = S48_MAKE_VALUE(void *);
S48_UNSAFE_EXTRACT_VALUE(res, void *) = handle;
S48_GC_UNPROTECT();
return res;
}
static s48_value
shared_object_dlsym(s48_value handle, s48_value name)
{
const char *error;
void *entry;
void *native_handle;
s48_value res;
char *native_name;
native_handle = S48_EXTRACT_VALUE(handle, void *);
native_name = s48_extract_byte_vector(name);
entry = dlsym(native_handle, native_name);
if (entry == NULL)
s48_raise_string_os_error((char*)dlerror());
res = S48_MAKE_VALUE(void *);
S48_UNSAFE_EXTRACT_VALUE(res, void *) = entry;
return res;
}
static s48_value
shared_object_dlclose(s48_value handle)
{
void *native_handle = S48_EXTRACT_VALUE(handle, void *);
if (dlclose(native_handle) < 0)
s48_raise_string_os_error((char*)dlerror());
return S48_UNSPECIFIC;
}
typedef void (*thunk)();
static s48_value
shared_object_call_thunk(s48_value value)
{
thunk entry;
entry = S48_EXTRACT_VALUE(value, thunk);
entry();
return S48_UNSPECIFIC;
}
void
s48_init_dynlink(void)
{
S48_EXPORT_FUNCTION(shared_object_dlopen);
S48_EXPORT_FUNCTION(shared_object_dlsym);
S48_EXPORT_FUNCTION(shared_object_dlclose);
S48_EXPORT_FUNCTION(shared_object_call_thunk);
}
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