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[rust.git] / src / test / ui / command / command-pre-exec.rs
1 // run-pass
2 // revisions: mir thir
3 // [thir]compile-flags: -Zthir-unsafeck
4
5 #![allow(stable_features)]
6 // ignore-windows - this is a unix-specific test
7 // ignore-emscripten no processes
8 // ignore-sgx no processes
9 #![feature(process_exec, rustc_private)]
10
11 use std::env;
12 use std::io::Error;
13 use std::os::unix::process::CommandExt;
14 use std::process::Command;
15 use std::sync::atomic::{AtomicUsize, Ordering};
16 use std::sync::Arc;
17
18 #[cfg(not(target_os = "linux"))]
19 fn getpid() -> u32 {
20     use std::process;
21     process::id()
22 }
23
24 /// We need to directly use the getpid syscall instead of using `process::id()`
25 /// because the libc wrapper might return incorrect values after a process was
26 /// forked.
27 #[cfg(target_os = "linux")]
28 fn getpid() -> u32 {
29     extern crate libc;
30     unsafe {
31         libc::syscall(libc::SYS_getpid) as _
32     }
33 }
34
35 fn main() {
36     if let Some(arg) = env::args().nth(1) {
37         match &arg[..] {
38             "test1" => println!("hello2"),
39             "test2" => assert_eq!(env::var("FOO").unwrap(), "BAR"),
40             "test3" => assert_eq!(env::current_dir().unwrap().to_str().unwrap(), "/"),
41             "empty" => {}
42             _ => panic!("unknown argument: {}", arg),
43         }
44         return;
45     }
46
47     let me = env::current_exe().unwrap();
48
49     let output = unsafe {
50         Command::new(&me)
51             .arg("test1")
52             .pre_exec(|| {
53                 println!("hello");
54                 Ok(())
55             })
56             .output()
57             .unwrap()
58     };
59     assert!(output.status.success());
60     assert!(output.stderr.is_empty());
61     assert_eq!(output.stdout, b"hello\nhello2\n");
62
63     let output = unsafe {
64         Command::new(&me)
65             .arg("test3")
66             .pre_exec(|| {
67                 env::set_current_dir("/").unwrap();
68                 Ok(())
69             })
70             .output()
71             .unwrap()
72     };
73     assert!(output.status.success());
74     assert!(output.stderr.is_empty());
75     assert!(output.stdout.is_empty());
76
77     let output = unsafe {
78         Command::new(&me)
79             .arg("bad")
80             .pre_exec(|| Err(Error::from_raw_os_error(102)))
81             .output()
82             .unwrap_err()
83     };
84     assert_eq!(output.raw_os_error(), Some(102));
85
86     let pid = getpid();
87     let output = unsafe {
88         Command::new(&me)
89             .arg("empty")
90             .pre_exec(move || {
91                 let child = getpid();
92                 assert!(pid != child);
93                 Ok(())
94             })
95             .output()
96             .unwrap()
97     };
98     assert!(output.status.success());
99     assert!(output.stderr.is_empty());
100     assert!(output.stdout.is_empty());
101
102     let mem = Arc::new(AtomicUsize::new(0));
103     let mem2 = mem.clone();
104     let output = unsafe {
105         Command::new(&me)
106             .arg("empty")
107             .pre_exec(move || {
108                 assert_eq!(mem2.fetch_add(1, Ordering::SeqCst), 0);
109                 Ok(())
110             })
111             .output()
112             .unwrap()
113     };
114     assert!(output.status.success());
115     assert!(output.stderr.is_empty());
116     assert!(output.stdout.is_empty());
117     assert_eq!(mem.load(Ordering::SeqCst), 0);
118 }