src/test/run-pass/command-before-exec.rs

   1 // Copyright 2016 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.
   4 //
   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.
  10
  11 // ignore-windows - this is a unix-specific test
  12 // ignore-emscripten no processes
  13
  14 #![feature(process_exec, libc)]
  15
  16 extern crate libc;
  17
  18 use std::env;
  19 use std::io::Error;
  20 use std::os::unix::process::CommandExt;
  21 use std::process::Command;
  22 use std::sync::Arc;
  23 use std::sync::atomic::{AtomicUsize, Ordering};
  24
  25 fn main() {
  26     if let Some(arg) = env::args().skip(1).next() {
  27         match &arg[..] {
  28             "test1" => println!("hello2"),
  29             "test2" => assert_eq!(env::var("FOO").unwrap(), "BAR"),
  30             "test3" => assert_eq!(env::current_dir().unwrap()
  31                                       .to_str().unwrap(), "/"),
  32             "empty" => {}
  33             _ => panic!("unknown argument: {}", arg),
  34         }
  35         return
  36     }
  37
  38     let me = env::current_exe().unwrap();
  39
  40     let output = Command::new(&me).arg("test1").before_exec(|| {
  41         println!("hello");
  42         Ok(())
  43     }).output().unwrap();
  44     assert!(output.status.success());
  45     assert!(output.stderr.is_empty());
  46     assert_eq!(output.stdout, b"hello\nhello2\n");
  47
  48     let output = Command::new(&me).arg("test2").before_exec(|| {
  49         env::set_var("FOO", "BAR");
  50         Ok(())
  51     }).output().unwrap();
  52     assert!(output.status.success());
  53     assert!(output.stderr.is_empty());
  54     assert!(output.stdout.is_empty());
  55
  56     let output = Command::new(&me).arg("test3").before_exec(|| {
  57         env::set_current_dir("/").unwrap();
  58         Ok(())
  59     }).output().unwrap();
  60     assert!(output.status.success());
  61     assert!(output.stderr.is_empty());
  62     assert!(output.stdout.is_empty());
  63
  64     let output = Command::new(&me).arg("bad").before_exec(|| {
  65         Err(Error::from_raw_os_error(102))
  66     }).output().unwrap_err();
  67     assert_eq!(output.raw_os_error(), Some(102));
  68
  69     let pid = unsafe { libc::getpid() };
  70     assert!(pid >= 0);
  71     let output = Command::new(&me).arg("empty").before_exec(move || {
  72         let child = unsafe { libc::getpid() };
  73         assert!(child >= 0);
  74         assert!(pid != child);
  75         Ok(())
  76     }).output().unwrap();
  77     assert!(output.status.success());
  78     assert!(output.stderr.is_empty());
  79     assert!(output.stdout.is_empty());
  80
  81     let mem = Arc::new(AtomicUsize::new(0));
  82     let mem2 = mem.clone();
  83     let output = Command::new(&me).arg("empty").before_exec(move || {
  84         assert_eq!(mem2.fetch_add(1, Ordering::SeqCst), 0);
  85         Ok(())
  86     }).output().unwrap();
  87     assert!(output.status.success());
  88     assert!(output.stderr.is_empty());
  89     assert!(output.stdout.is_empty());
  90     assert_eq!(mem.load(Ordering::SeqCst), 0);
  91 }