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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
/*!
Dynamic library facilities.
A simple wrapper over the platforms dynamic library facilities
*/
use cast;
use path;
use libc;
use ops::*;
use option::*;
use result::*;
pub struct DynamicLibrary { priv handle: *libc::c_void }
impl Drop for DynamicLibrary {
fn drop(&self) {
match do dl::check_for_errors_in {
unsafe {
dl::close(self.handle)
}
} {
Ok(()) => { },
Err(str) => fail!(str)
}
}
}
impl DynamicLibrary {
/// Lazily open a dynamic library. When passed None it gives a
/// handle to the calling process
pub fn open(filename: Option<&path::Path>) -> Result<DynamicLibrary, ~str> {
do dl::check_for_errors_in {
unsafe {
DynamicLibrary { handle:
match filename {
Some(name) => dl::open_external(name),
None => dl::open_internal()
}
}
}
}
}
/// Access the value at the symbol of the dynamic library
pub unsafe fn symbol<T>(&self, symbol: &str) -> Result<T, ~str> {
// This function should have a lifetime constraint of 'self on
// T but that feature is still unimplemented
do dl::check_for_errors_in {
let symbol_value = do symbol.as_c_str |raw_string| {
dl::symbol(self.handle, raw_string)
};
cast::transmute(symbol_value)
}
}
}
#[test]
#[ignore(cfg(windows))]
priv fn test_loading_cosine () {
// The math library does not need to be loaded since it is already
// statically linked in
let libm = match DynamicLibrary::open(None) {
Err (error) => fail!("Could not load self as module: %s", error),
Ok (libm) => libm
};
// Unfortunately due to issue #6194 it is not possible to call
// this as a C function
let cosine: extern fn(libc::c_double) -> libc::c_double = unsafe {
match libm.symbol("cos") {
Err (error) => fail!("Could not load function cos: %s", error),
Ok (cosine) => cosine
}
};
let argument = 0.0;
let expected_result = 1.0;
let result = cosine(argument);
if result != expected_result {
fail!("cos(%?) != %? but equaled %? instead", argument,
expected_result, result)
}
}
#[cfg(target_os = "linux")]
#[cfg(target_os = "android")]
#[cfg(target_os = "macos")]
#[cfg(target_os = "freebsd")]
mod dl {
use libc;
use path;
use ptr;
use str;
use task;
use result::*;
pub unsafe fn open_external(filename: &path::Path) -> *libc::c_void {
do filename.to_str().as_c_str |raw_name| {
dlopen(raw_name, Lazy as libc::c_int)
}
}
pub unsafe fn open_internal() -> *libc::c_void {
dlopen(ptr::null(), Lazy as libc::c_int)
}
pub fn check_for_errors_in<T>(f: &fn()->T) -> Result<T, ~str> {
unsafe {
do task::atomically {
let _old_error = dlerror();
let result = f();
let last_error = dlerror();
if ptr::null() == last_error {
Ok(result)
} else {
Err(str::raw::from_c_str(last_error))
}
}
}
}
pub unsafe fn symbol(handle: *libc::c_void, symbol: *libc::c_char) -> *libc::c_void {
dlsym(handle, symbol)
}
pub unsafe fn close(handle: *libc::c_void) {
dlclose(handle); ()
}
pub enum RTLD {
Lazy = 1,
Now = 2,
Global = 256,
Local = 0,
}
#[link_name = "dl"]
extern {
fn dlopen(filename: *libc::c_char, flag: libc::c_int) -> *libc::c_void;
fn dlerror() -> *libc::c_char;
fn dlsym(handle: *libc::c_void, symbol: *libc::c_char) -> *libc::c_void;
fn dlclose(handle: *libc::c_void) -> libc::c_int;
}
}
#[cfg(target_os = "win32")]
mod dl {
use os;
use libc;
use path;
use ptr;
use task;
use result::*;
pub unsafe fn open_external(filename: &path::Path) -> *libc::c_void {
do os::win32::as_utf16_p(filename.to_str()) |raw_name| {
LoadLibraryW(raw_name)
}
}
pub unsafe fn open_internal() -> *libc::c_void {
let handle = ptr::null();
GetModuleHandleExW(0 as libc::DWORD, ptr::null(), &handle as **libc::c_void);
handle
}
pub fn check_for_errors_in<T>(f: &fn()->T) -> Result<T, ~str> {
unsafe {
do task::atomically {
SetLastError(0);
let result = f();
let error = os::errno();
if 0 == error {
Ok(result)
} else {
Err(fmt!("Error code %?", error))
}
}
}
}
pub unsafe fn symbol(handle: *libc::c_void, symbol: *libc::c_char) -> *libc::c_void {
GetProcAddress(handle, symbol)
}
pub unsafe fn close(handle: *libc::c_void) {
FreeLibrary(handle); ()
}
#[link_name = "kernel32"]
extern "stdcall" {
fn SetLastError(error: u32);
fn LoadLibraryW(name: *u16) -> *libc::c_void;
fn GetModuleHandleExW(dwFlags: libc::DWORD, name: *u16,
handle: **libc::c_void) -> *libc::c_void;
fn GetProcAddress(handle: *libc::c_void, name: *libc::c_char) -> *libc::c_void;
fn FreeLibrary(handle: *libc::c_void);
}
}
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