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dlload.c
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dlload.c
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// This file is a part of Julia. License is MIT: http:https://julialang.org/license
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <sys/stat.h>
#include "platform.h"
#include "julia.h"
#include "julia_internal.h"
#ifdef _OS_WINDOWS_
#include <windows.h>
#include <direct.h>
#else
#include <unistd.h>
#include <dlfcn.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
#if defined(__APPLE__)
static char *extensions[] = { "", ".dylib" };
#define N_EXTENSIONS 2
#elif defined(_OS_WINDOWS_)
static char *extensions[] = { "", ".dll" };
#define N_EXTENSIONS 2
extern int needsSymRefreshModuleList;
#else
static char *extensions[] = { ".so", "" };
#define N_EXTENSIONS 2
#endif
#define PATHBUF 512
extern char *julia_home;
#define JL_RTLD(flags, FLAG) (flags & JL_RTLD_ ## FLAG ? RTLD_ ## FLAG : 0)
DLLEXPORT int jl_uv_dlopen(const char *filename, jl_uv_libhandle lib_, unsigned flags)
{
uv_lib_t *lib = (uv_lib_t *) lib_;
#if defined(_OS_WINDOWS_)
needsSymRefreshModuleList = 1;
#endif
#if defined(RTLD_GLOBAL) && defined(RTLD_LAZY) /* POSIX flags available */
dlerror(); /* Reset error status. */
lib->handle = dlopen(filename,
(flags & JL_RTLD_NOW ? RTLD_NOW : RTLD_LAZY)
| (flags & JL_RTLD_GLOBAL ? RTLD_GLOBAL : RTLD_LOCAL)
#ifdef RTLD_NODELETE
| JL_RTLD(flags, NODELETE)
#endif
#ifdef RTLD_NOLOAD
| JL_RTLD(flags, NOLOAD)
#endif
#ifdef RTLD_DEEPBIND
| JL_RTLD(flags, DEEPBIND)
#endif
#ifdef RTLD_FIRST
| JL_RTLD(flags, FIRST)
#endif
);
if (lib->handle) {
lib->errmsg = NULL;
return 0;
}
else {
lib->errmsg = strdup(dlerror());
return -1;
}
#else
return uv_dlopen(filename, lib);
#endif
}
static uv_lib_t *jl_load_dynamic_library_(const char *modname, unsigned flags, int throw_err)
{
int error;
char *ext;
char path[PATHBUF];
int i;
uv_lib_t *handle = (uv_lib_t*)malloc(sizeof(uv_lib_t));
handle->errmsg = NULL;
if (modname == NULL) {
#ifdef _OS_WINDOWS_
if (!GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
(LPCWSTR)(&jl_load_dynamic_library),
&handle->handle))
jl_errorf("could not load base module", modname);
#else
handle->handle = dlopen(NULL,RTLD_NOW);
#endif
goto done;
}
#ifdef _OS_WINDOWS_
else if (modname[1] == ':') {
#else
else if (modname[0] == '/') {
#endif
error = jl_uv_dlopen(modname,handle,flags);
if (!error) goto done;
}
else if (jl_base_module != NULL) {
jl_array_t *DL_LOAD_PATH = (jl_array_t*)jl_get_global(jl_base_module, jl_symbol("DL_LOAD_PATH"));
if (DL_LOAD_PATH != NULL) {
size_t j;
for (j = 0; j < jl_array_len(DL_LOAD_PATH); j++) {
char *dl_path = jl_string_data(jl_cell_data(DL_LOAD_PATH)[j]);
size_t len = strlen(dl_path);
if (len == 0)
continue;
for(i=0; i < N_EXTENSIONS; i++) {
ext = extensions[i];
path[0] = '\0';
handle->handle = NULL;
if (dl_path[len-1] == PATHSEPSTRING[0])
snprintf(path, PATHBUF, "%s%s%s", dl_path, modname, ext);
else
snprintf(path, PATHBUF, "%s" PATHSEPSTRING "%s%s", dl_path, modname, ext);
if (handle->errmsg) {
uv_dlclose(handle);
}
error = jl_uv_dlopen(path, handle, flags);
if (!error) goto done;
}
}
}
}
for(i=0; i < N_EXTENSIONS; i++) {
ext = extensions[i];
path[0] = '\0';
handle->handle = NULL;
/* try loading from standard library path */
snprintf(path, PATHBUF, "%s%s", modname, ext);
if (handle->errmsg) {
uv_dlclose(handle);
}
error = jl_uv_dlopen(path, handle, flags);
if (!error) goto done;
}
#if defined(__linux__) || defined(__FreeBSD__)
{
const char *soname = jl_lookup_soname(modname, strlen(modname));
if (handle->errmsg) {
free(handle->errmsg);
handle->errmsg = NULL;
}
error = (soname==NULL) || jl_uv_dlopen(soname, handle, flags);
if (!error) goto done;
}
#endif
if (throw_err) {
//jl_printf(JL_STDERR, "could not load module %s (%d): %s\n", modname, error, uv_dlerror(handle));
jl_errorf("could not load module %s: %s", modname, uv_dlerror(handle));
}
uv_dlclose(handle);
free(handle);
return NULL;
done:
return handle;
}
jl_uv_libhandle jl_load_dynamic_library_e(const char *modname, unsigned flags)
{
return (jl_uv_libhandle) jl_load_dynamic_library_(modname, flags, 0);
}
jl_uv_libhandle jl_load_dynamic_library(const char *modname, unsigned flags)
{
return (jl_uv_libhandle) jl_load_dynamic_library_(modname, flags, 1);
}
void *jl_dlsym_e(jl_uv_libhandle handle, const char *symbol)
{
void *ptr;
int error=uv_dlsym((uv_lib_t *) handle, symbol, &ptr);
if (error) ptr=NULL;
return ptr;
}
void *jl_dlsym(jl_uv_libhandle handle, const char *symbol)
{
void *ptr;
int error = uv_dlsym((uv_lib_t *) handle, symbol, &ptr);
if (error != 0) {
jl_printf(JL_STDERR, "symbol could not be found %s (%d): %s\n", symbol, error, uv_dlerror((uv_lib_t *) handle));
}
return ptr;
}
#ifdef _OS_WINDOWS_
//Look for symbols in win32 libraries
char *jl_dlfind_win32(const char *f_name)
{
if (jl_dlsym_e(jl_exe_handle, f_name))
return (char*)1;
if (jl_dlsym_e(jl_dl_handle, f_name))
return (char*)2;
if (jl_dlsym_e(jl_kernel32_handle, f_name))
return "kernel32";
if (jl_dlsym_e(jl_ntdll_handle, f_name))
return "ntdll";
if (jl_dlsym_e(jl_crtdll_handle, f_name))
#if _MSC_VER == 1800
return "msvcr120";
#elif defined(_MSC_VER)
#error This version of MSVC has not been tested.
#else
return "msvcrt";
#endif
if (jl_dlsym(jl_winsock_handle, f_name))
return "ws2_32";
// additional common libraries (libc?) could be added here, but in general,
// it is better to specify the library explicitly in the code. This exists
// mainly to ease compatibility with linux, and for libraries that don't
// have a name (julia.exe and libjulia.dll)
// We could also loop over all libraries that have been used so far, but, again,
// explicit is preferred over implicit
return NULL;
// oops, we didn't find it. NULL defaults to searching jl_RTLD_DEFAULT_handle,
// which defaults to jl_dl_handle, where we won't find it, and will throw the
// appropriate error.
}
#endif
#ifdef __cplusplus
}
#endif