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/* Portable API for dynamic loading.
Copyright 2015 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
/* Assume modules are enabled on modern systems... *Yes*, the
preprocessor macro checks could be more precise. I don't care.
If you think the abstraction is too leaky use libltdl (libtool),
don't reinvent the wheel by fixing this one. */
#include <config.h>
#include "dynlib.h"
#ifdef WINDOWSNT
/* MS-Windows systems. */
#include <errno.h>
#include "lisp.h"
#include "w32.h"
static DWORD dynlib_last_err;
/* This needs to be called at startup to countermand any non-zero
values recorded by temacs. */
void
dynlib_reset_last_error (void)
{
dynlib_last_err = 0;
}
dynlib_handle_ptr
dynlib_open (const char *dll_fname)
{
HMODULE hdll;
char dll_fname_local[MAX_UTF8_PATH];
if (!dll_fname)
{
errno = ENOTSUP;
return NULL;
}
if (!dll_fname)
hdll = GetModuleHandle (NULL);
else
{
/* LoadLibrary wants backslashes. */
strcpy (dll_fname_local, dll_fname);
unixtodos_filename (dll_fname_local);
if (w32_unicode_filenames)
{
wchar_t dll_fname_w[MAX_PATH];
filename_to_utf16 (dll_fname_local, dll_fname_w);
hdll = LoadLibraryW (dll_fname_w);
}
else
{
char dll_fname_a[MAX_PATH];
filename_to_ansi (dll_fname_local, dll_fname_a);
hdll = LoadLibraryA (dll_fname_a);
}
}
if (!hdll)
dynlib_last_err = GetLastError ();
return (dynlib_handle_ptr) hdll;
}
void *
dynlib_sym (dynlib_handle_ptr h, const char *sym)
{
FARPROC sym_addr = NULL;
if (!h || h == INVALID_HANDLE_VALUE || !sym)
{
dynlib_last_err = ERROR_INVALID_PARAMETER;
return NULL;
}
sym_addr = GetProcAddress ((HMODULE) h, sym);
if (!sym_addr)
dynlib_last_err = GetLastError ();
return (void *)sym_addr;
}
bool
dynlib_addr (void *ptr, const char **path, const char **sym)
{
return false; /* Not implemented yet. */
}
const char *
dynlib_error (void)
{
char *error_string = NULL;
if (dynlib_last_err)
{
error_string = w32_strerror (dynlib_last_err);
dynlib_last_err = 0;
}
return error_string;
}
int
dynlib_close (dynlib_handle_ptr h)
{
if (!h || h == INVALID_HANDLE_VALUE)
{
dynlib_last_err = ERROR_INVALID_PARAMETER;
return -1;
}
/* If the handle is for the main module (the .exe file), it
shouldn't be passed to FreeLibrary, because GetModuleHandle
doesn't increment the refcount, but FreeLibrary does decrement
it. I don't think this should matter for the main module, but
just in case, we avoid the call here, relying on another call to
GetModuleHandle to return the same value. */
if (h == GetModuleHandle (NULL))
return 0;
if (!FreeLibrary ((HMODULE) h))
{
dynlib_last_err = GetLastError ();
return -1;
}
return 0;
}
#elif defined HAVE_UNISTD_H
/* POSIX systems. */
#include <dlfcn.h>
dynlib_handle_ptr
dynlib_open (const char *path)
{
return dlopen (path, RTLD_LAZY);
}
void *
dynlib_sym (dynlib_handle_ptr h, const char *sym)
{
return dlsym (h, sym);
}
bool
dynlib_addr (void *ptr, const char **path, const char **sym)
{
#ifdef HAVE_DLADDR
Dl_info info;
if (dladdr (ptr, &info) && info.dli_fname && info.dli_sname)
{
*path = info.dli_fname;
*sym = info.dli_sname;
return true;
}
#endif
return false;
}
const char *
dynlib_error (void)
{
return dlerror ();
}
/* FIXME: Currently there is no way to unload a module, so this
function is never used. */
#if false
int
dynlib_close (dynlib_handle_ptr h)
{
return dlclose (h) == 0;
}
#endif
#else
#error "No dynamic loading for this system"
#endif
#if !HAVE_DLFUNC
# define dlfunc dynlib_sym
#endif
dynlib_function_ptr
dynlib_func (dynlib_handle_ptr h, const char *sym)
{
return (dynlib_function_ptr) dlfunc (h, sym);
}
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