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//! Command execution module.
//!
use std::ffi::OsStr;
use std::process::{Command,Child};
use std::io::{Result, Error, ErrorKind};
use libc::c_int;
use libc::pid_t;
const WNOHANG: c_int = 0x00000001;
extern {
/// wait for a child process to stop or terminate.
pub fn waitpid(pid: pid_t, stat_loc: *mut c_int, options: c_int) -> pid_t;
}
/// Extension to the Child struct that allows to check the status without block the
/// current thread.
pub trait ChildExt {
fn wait_nohang(&mut self) -> Result<bool>;
}
impl ChildExt for Child {
/// Checks if the calling child is a zombie and try to kill it, returning
/// if it was killed or not.
fn wait_nohang(&mut self) -> Result<bool> {
let mut stat = 0i32;
let pid = unsafe { waitpid(self.id() as i32, &mut stat, WNOHANG) };
if pid < 0 {
Err(Error::new(ErrorKind::NotFound, format!("pid not found {}", pid)))
} else {
if pid > 0 {
Ok(self.wait()
.map(|x| {
x.success()
}).unwrap_or(false))
} else {
Ok(false)
}
}
}
}
/// Executes the given command.
pub fn exec_cmd<S: AsRef<OsStr>>(program: S, args: &[S]) -> Result<Child> {
Command::new(program).args(args).spawn()
}
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