1 // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Global storage for command line arguments
13 //! The current incarnation of the Rust runtime expects for
14 //! the processes `argc` and `argv` arguments to be stored
15 //! in a globally-accessible location for use by the `os` module.
17 //! Only valid to call on Linux. Mac and Windows use syscalls to
18 //! discover the command line arguments.
20 //! FIXME #7756: Would be nice for this to not exist.
23 use collections::vec::Vec;
25 /// One-time global initialization.
26 pub unsafe fn init(argc: int, argv: *const *const u8) { imp::init(argc, argv) }
28 /// One-time global cleanup.
29 pub unsafe fn cleanup() { imp::cleanup() }
31 /// Take the global arguments from global storage.
32 pub fn take() -> Option<Vec<Vec<u8>>> { imp::take() }
34 /// Give the global arguments to global storage.
36 /// It is an error if the arguments already exist.
37 pub fn put(args: Vec<Vec<u8>>) { imp::put(args) }
39 /// Make a clone of the global arguments.
40 pub fn clone() -> Option<Vec<Vec<u8>>> { imp::clone() }
42 #[cfg(any(target_os = "linux",
43 target_os = "android",
44 target_os = "freebsd",
45 target_os = "dragonfly"))]
49 use alloc::boxed::Box;
50 use collections::slice::CloneableVector;
51 use collections::vec::Vec;
55 use mutex::{StaticNativeMutex, NATIVE_MUTEX_INIT};
57 static mut GLOBAL_ARGS_PTR: uint = 0;
58 static LOCK: StaticNativeMutex = NATIVE_MUTEX_INIT;
60 pub unsafe fn init(argc: int, argv: *const *const u8) {
61 let args = load_argc_and_argv(argc, argv);
65 pub unsafe fn cleanup() {
66 rtassert!(take().is_some());
70 pub fn take() -> Option<Vec<Vec<u8>>> {
72 let ptr = get_global_ptr();
73 let val = mem::replace(&mut *ptr, None);
74 val.as_ref().map(|s: &Box<Vec<Vec<u8>>>| (**s).clone())
78 pub fn put(args: Vec<Vec<u8>>) {
80 let ptr = get_global_ptr();
81 rtassert!((*ptr).is_none());
82 (*ptr) = Some(box args.clone());
86 pub fn clone() -> Option<Vec<Vec<u8>>> {
88 let ptr = get_global_ptr();
89 (*ptr).as_ref().map(|s: &Box<Vec<Vec<u8>>>| (**s).clone())
93 fn with_lock<T>(f: || -> T) -> T {
95 let _guard = LOCK.lock();
100 fn get_global_ptr() -> *mut Option<Box<Vec<Vec<u8>>>> {
101 unsafe { mem::transmute(&GLOBAL_ARGS_PTR) }
104 unsafe fn load_argc_and_argv(argc: int, argv: *const *const u8) -> Vec<Vec<u8>> {
105 Vec::from_fn(argc as uint, |i| {
106 let base = *argv.offset(i as int);
108 while *base.offset(len) != 0 { len += 1; }
109 slice::raw::buf_as_slice(base, len as uint, |slice| {
118 use std::finally::Finally;
124 // Preserve the actual global state.
125 let saved_value = take();
132 put(expected.clone());
133 assert!(clone() == Some(expected.clone()));
134 assert!(take() == Some(expected.clone()));
135 assert!(take() == None);
139 // Restore the actual global state.
141 Some(ref args) => put(args.clone()),
149 #[cfg(any(target_os = "macos",
151 target_os = "windows"))]
153 use core::prelude::*;
154 use collections::vec::Vec;
156 pub unsafe fn init(_argc: int, _argv: *const *const u8) {
162 pub fn take() -> Option<Vec<Vec<u8>>> {
166 pub fn put(_args: Vec<Vec<u8>>) {
170 pub fn clone() -> Option<Vec<Vec<u8>>> {