2016-06-30 03:56:12 +00:00
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// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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2019-03-04 22:58:03 +00:00
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use std::ffi::OsStr;
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2019-04-11 08:41:20 +00:00
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use std::process::{Command, Stdio};
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2019-03-30 16:48:36 +00:00
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use std::{cmp, io};
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2019-03-04 22:58:03 +00:00
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2018-12-06 21:38:34 +00:00
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#[cfg(not(windows))]
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use std::os::unix::process::CommandExt;
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2019-03-04 22:58:03 +00:00
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#[cfg(windows)]
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use std::os::windows::process::CommandExt;
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#[cfg(windows)]
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use winapi::um::winbase::{CREATE_NEW_PROCESS_GROUP, CREATE_NO_WINDOW};
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2017-01-07 00:32:29 +00:00
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2016-06-08 04:11:23 +00:00
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/// Threading utilities
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pub mod thread {
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/// Like `thread::spawn`, but with a `name` argument
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pub fn spawn_named<F, T, S>(name: S, f: F) -> ::std::thread::JoinHandle<T>
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2018-12-06 21:38:34 +00:00
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where
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F: FnOnce() -> T,
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F: Send + 'static,
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T: Send + 'static,
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S: Into<String>,
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2016-06-08 04:11:23 +00:00
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{
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2019-03-30 16:48:36 +00:00
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::std::thread::Builder::new().name(name.into()).spawn(f).expect("thread spawn works")
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2016-06-08 04:11:23 +00:00
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}
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2016-09-26 02:49:44 +00:00
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2018-12-06 21:38:34 +00:00
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pub use std::thread::*;
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2016-06-08 04:11:23 +00:00
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}
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2016-12-30 01:39:30 +00:00
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pub fn limit<T: Ord>(value: T, min: T, max: T) -> T {
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cmp::min(cmp::max(value, min), max)
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}
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2018-12-06 21:38:34 +00:00
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#[cfg(not(windows))]
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2019-01-05 20:47:12 +00:00
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pub fn start_daemon<I, S>(program: &str, args: I) -> io::Result<()>
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2019-03-30 16:48:36 +00:00
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where
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I: IntoIterator<Item = S>,
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S: AsRef<OsStr>,
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2019-01-05 20:47:12 +00:00
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{
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2019-07-30 22:13:51 +00:00
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unsafe {
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Command::new(program)
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.args(args)
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.stdin(Stdio::null())
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.stdout(Stdio::null())
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.stderr(Stdio::null())
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.pre_exec(|| {
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match ::libc::fork() {
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-1 => return Err(io::Error::last_os_error()),
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0 => (),
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_ => ::libc::_exit(0),
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}
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if ::libc::setsid() == -1 {
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return Err(io::Error::last_os_error());
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}
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Ok(())
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})
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.spawn()?
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.wait()
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.map(|_| ())
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}
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2018-12-06 21:38:34 +00:00
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}
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#[cfg(windows)]
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2019-01-05 20:47:12 +00:00
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pub fn start_daemon<I, S>(program: &str, args: I) -> io::Result<()>
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2019-03-30 16:48:36 +00:00
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where
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I: IntoIterator<Item = S>,
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S: AsRef<OsStr>,
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2019-01-05 20:47:12 +00:00
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{
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2019-03-04 22:58:03 +00:00
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// Setting all the I/O handles to null and setting the
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// CREATE_NEW_PROCESS_GROUP and CREATE_NO_WINDOW has the effect
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// that console applications will run without opening a new
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// console window.
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Command::new(program)
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.args(args)
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.stdin(Stdio::null())
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.stdout(Stdio::null())
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.stderr(Stdio::null())
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.creation_flags(CREATE_NEW_PROCESS_GROUP | CREATE_NO_WINDOW)
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.spawn()
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.map(|_| ())
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2018-12-06 21:38:34 +00:00
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}
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2016-12-30 01:39:30 +00:00
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#[cfg(test)]
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mod tests {
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use super::limit;
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#[test]
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fn limit_works() {
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assert_eq!(10, limit(10, 0, 100));
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assert_eq!(10, limit(5, 10, 100));
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assert_eq!(100, limit(1000, 10, 100));
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}
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}
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