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// Copyright 2012-2013 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.
//! Global storage for command line arguments
//!
//! The current incarnation of the Rust runtime expects for
//! the processes `argc` and `argv` arguments to be stored
//! in a globally-accessible location for use by the `os` module.
//!
//! Only valid to call on linux. Mac and Windows use syscalls to
//! discover the command line arguments.
//!
//! FIXME #7756: Would be nice for this to not exist.
use core::prelude::*;
use collections::vec::Vec;
/// One-time global initialization.
pub unsafe fn init(argc: int, argv: **u8) { imp::init(argc, argv) }
/// One-time global cleanup.
pub unsafe fn cleanup() { imp::cleanup() }
/// Take the global arguments from global storage.
pub fn take() -> Option<Vec<Vec<u8>>> { imp::take() }
/// Give the global arguments to global storage.
///
/// It is an error if the arguments already exist.
pub fn put(args: Vec<Vec<u8>>) { imp::put(args) }
/// Make a clone of the global arguments.
pub fn clone() -> Option<Vec<Vec<u8>>> { imp::clone() }
#[cfg(target_os = "linux")]
#[cfg(target_os = "android")]
#[cfg(target_os = "freebsd")]
mod imp {
use core::prelude::*;
use alloc::owned::Box;
use collections::vec::Vec;
use core::mem;
use core::slice;
use mutex::{StaticNativeMutex, NATIVE_MUTEX_INIT};
static mut global_args_ptr: uint = 0;
static mut lock: StaticNativeMutex = NATIVE_MUTEX_INIT;
pub unsafe fn init(argc: int, argv: **u8) {
let args = load_argc_and_argv(argc, argv);
put(args);
}
pub unsafe fn cleanup() {
rtassert!(take().is_some());
lock.destroy();
}
pub fn take() -> Option<Vec<Vec<u8>>> {
with_lock(|| unsafe {
let ptr = get_global_ptr();
let val = mem::replace(&mut *ptr, None);
val.as_ref().map(|s: &Box<Vec<Vec<u8>>>| (**s).clone())
})
}
pub fn put(args: Vec<Vec<u8>>) {
with_lock(|| unsafe {
let ptr = get_global_ptr();
rtassert!((*ptr).is_none());
(*ptr) = Some(box args.clone());
})
}
pub fn clone() -> Option<Vec<Vec<u8>>> {
with_lock(|| unsafe {
let ptr = get_global_ptr();
(*ptr).as_ref().map(|s: &Box<Vec<Vec<u8>>>| (**s).clone())
})
}
fn with_lock<T>(f: || -> T) -> T {
unsafe {
let _guard = lock.lock();
f()
}
}
fn get_global_ptr() -> *mut Option<Box<Vec<Vec<u8>>>> {
unsafe { mem::transmute(&global_args_ptr) }
}
unsafe fn load_argc_and_argv(argc: int, argv: **u8) -> Vec<Vec<u8>> {
Vec::from_fn(argc as uint, |i| {
let base = *argv.offset(i as int);
let mut len = 0;
while *base.offset(len) != 0 { len += 1; }
slice::raw::buf_as_slice(base, len as uint, |slice| {
Vec::from_slice(slice)
})
})
}
#[cfg(test)]
mod tests {
use std::prelude::*;
use std::finally::Finally;
use super::*;
#[test]
fn smoke_test() {
// Preserve the actual global state.
let saved_value = take();
let expected = vec![
Vec::from_slice(b"happy"),
Vec::from_slice(b"today?"),
];
put(expected.clone());
assert!(clone() == Some(expected.clone()));
assert!(take() == Some(expected.clone()));
assert!(take() == None);
(|| {
}).finally(|| {
// Restore the actual global state.
match saved_value {
Some(ref args) => put(args.clone()),
None => ()
}
})
}
}
}
#[cfg(target_os = "macos")]
#[cfg(target_os = "ios")]
#[cfg(target_os = "win32")]
mod imp {
use core::prelude::*;
use collections::vec::Vec;
pub unsafe fn init(_argc: int, _argv: **u8) {
}
pub fn cleanup() {
}
pub fn take() -> Option<Vec<Vec<u8>>> {
fail!()
}
pub fn put(_args: Vec<Vec<u8>>) {
fail!()
}
pub fn clone() -> Option<Vec<Vec<u8>>> {
fail!()
}
}
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