3 // ignore-emscripten no processes
4 // ignore-sgx no processes
6 #![feature(rustc_private)]
10 use std::process::{Command, Stdio};
12 use std::io::{self, Read, Write};
15 unsafe fn without_stdio<R, F: FnOnce() -> R>(f: F) -> R {
25 assert!(libc::close(0) >= 0);
26 assert!(libc::close(1) >= 0);
27 assert!(libc::close(2) >= 0);
31 assert!(libc::dup2(a, 0) >= 0);
32 assert!(libc::dup2(b, 1) >= 0);
33 assert!(libc::dup2(c, 2) >= 0);
39 fn assert_fd_is_valid(fd: libc::c_int) {
40 if unsafe { libc::fcntl(fd, libc::F_GETFD) == -1 } {
41 panic!("file descriptor {} is not valid: {}", fd, io::Error::last_os_error());
46 fn assert_fd_is_valid(_fd: libc::c_int) {}
49 unsafe fn without_stdio<R, F: FnOnce() -> R>(f: F) -> R {
51 type HANDLE = *mut u8;
54 const STD_INPUT_HANDLE: DWORD = -10i32 as DWORD;
55 const STD_OUTPUT_HANDLE: DWORD = -11i32 as DWORD;
56 const STD_ERROR_HANDLE: DWORD = -12i32 as DWORD;
57 const INVALID_HANDLE_VALUE: HANDLE = !0 as HANDLE;
60 fn GetStdHandle(which: DWORD) -> HANDLE;
61 fn SetStdHandle(which: DWORD, handle: HANDLE) -> BOOL;
65 let handle = GetStdHandle(id);
66 assert!(handle != INVALID_HANDLE_VALUE);
67 assert!(SetStdHandle(id, INVALID_HANDLE_VALUE) != 0);
71 let a = doit(STD_INPUT_HANDLE);
72 let b = doit(STD_OUTPUT_HANDLE);
73 let c = doit(STD_ERROR_HANDLE);
77 let doit = |id, handle| {
78 assert!(SetStdHandle(id, handle) != 0);
80 doit(STD_INPUT_HANDLE, a);
81 doit(STD_OUTPUT_HANDLE, b);
82 doit(STD_ERROR_HANDLE, c);
88 if env::args().len() > 1 {
89 // Writing to stdout & stderr should not panic.
91 assert!(io::stdout().write(b"test\n").is_ok());
92 assert!(io::stderr().write(b"test\n").is_ok());
94 // Stdin should be at EOF.
95 assert_eq!(io::stdin().read(&mut [0; 10]).unwrap(), 0);
97 // Standard file descriptors should be valid on UNIX:
98 assert_fd_is_valid(0);
99 assert_fd_is_valid(1);
100 assert_fd_is_valid(2);
104 // First, make sure reads/writes without stdio work if stdio itself is
106 let (a, b, c) = unsafe {
108 let a = io::stdout().write(b"test\n");
109 let b = io::stderr().write(b"test\n");
110 let c = io::stdin().read(&mut [0; 10]);
116 assert_eq!(a.unwrap(), 5);
117 assert_eq!(b.unwrap(), 5);
118 assert_eq!(c.unwrap(), 0);
120 // Second, spawn a child and do some work with "null" descriptors to make
122 let me = env::current_exe().unwrap();
123 let status = Command::new(&me)
125 .stdin(Stdio::null())
126 .stdout(Stdio::null())
127 .stderr(Stdio::null())
129 assert!(status.success(), "{} isn't a success", status);
131 // Finally, close everything then spawn a child to make sure everything is
133 let status = unsafe {
134 without_stdio(|| Command::new(&me).arg("next").status())
136 assert!(status.success(), "{} isn't a success", status);