1 // Copyright 2012-2015 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.
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",
46 target_os = "openbsd"))]
54 use sync::{StaticMutex, MUTEX_INIT};
56 static mut GLOBAL_ARGS_PTR: uint = 0;
57 static LOCK: StaticMutex = MUTEX_INIT;
59 pub unsafe fn init(argc: int, argv: *const *const u8) {
60 let args = load_argc_and_argv(argc, argv);
64 pub unsafe fn cleanup() {
69 pub fn take() -> Option<Vec<Vec<u8>>> {
70 let _guard = LOCK.lock();
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>>) {
79 let _guard = LOCK.lock();
81 let ptr = get_global_ptr();
82 rtassert!((*ptr).is_none());
83 (*ptr) = Some(box args.clone());
87 pub fn clone() -> Option<Vec<Vec<u8>>> {
88 let _guard = LOCK.lock();
90 let ptr = get_global_ptr();
91 (*ptr).as_ref().map(|s: &Box<Vec<Vec<u8>>>| (**s).clone())
95 fn get_global_ptr() -> *mut Option<Box<Vec<Vec<u8>>>> {
96 unsafe { mem::transmute(&GLOBAL_ARGS_PTR) }
99 unsafe fn load_argc_and_argv(argc: int, argv: *const *const u8) -> Vec<Vec<u8>> {
100 let argv = argv as *const *const libc::c_char;
101 (0..argc as uint).map(|i| {
102 ffi::c_str_to_bytes(&*argv.offset(i as int)).to_vec()
109 use finally::Finally;
115 // Preserve the actual global state.
116 let saved_value = take();
123 put(expected.clone());
124 assert!(clone() == Some(expected.clone()));
125 assert!(take() == Some(expected.clone()));
126 assert!(take() == None);
130 // Restore the actual global state.
132 Some(ref args) => put(args.clone()),
140 #[cfg(any(target_os = "macos",
142 target_os = "windows"))]
144 use core::prelude::*;
147 pub unsafe fn init(_argc: int, _argv: *const *const u8) {
153 pub fn take() -> Option<Vec<Vec<u8>>> {
157 pub fn put(_args: Vec<Vec<u8>>) {
161 pub fn clone() -> Option<Vec<Vec<u8>>> {