From 1ec7a697328fb10e7135b87557ff0a5ea702dd8d Mon Sep 17 00:00:00 2001 From: Alex Crichton Date: Thu, 16 Apr 2015 09:44:05 -0700 Subject: std: Add an unstable method Child::id This commits adds a method to the `std::process` module to get the process identifier of the child as a `u32`. On Windows the underlying identifier is already a `u32`, and on Unix the type is typically defined as `c_int` (`i32` for almost all our supported platforms), but the actually pid is normally a small positive number. Eventually we may add functions to load information about a process based on its identifier or the ability to terminate a process based on its identifier, but for now this function should enable this sort of functionality to exist outside the standard library. --- src/libstd/sys/windows/c.rs | 1 + src/libstd/sys/windows/process.rs | 6 ++++++ 2 files changed, 7 insertions(+) (limited to 'src/libstd/sys/windows') diff --git a/src/libstd/sys/windows/c.rs b/src/libstd/sys/windows/c.rs index b07d063de45..e9b850856e1 100644 --- a/src/libstd/sys/windows/c.rs +++ b/src/libstd/sys/windows/c.rs @@ -482,6 +482,7 @@ extern "system" { dwMilliseconds: libc::DWORD) -> libc::DWORD; pub fn SwitchToThread() -> libc::BOOL; pub fn Sleep(dwMilliseconds: libc::DWORD); + pub fn GetProcessId(handle: libc::HANDLE) -> libc::DWORD; } #[link(name = "userenv")] diff --git a/src/libstd/sys/windows/process.rs b/src/libstd/sys/windows/process.rs index 032a349b00e..bc4762c197e 100644 --- a/src/libstd/sys/windows/process.rs +++ b/src/libstd/sys/windows/process.rs @@ -193,6 +193,12 @@ impl Process { Ok(()) } + pub fn id(&self) -> u32 { + unsafe { + c::GetProcessId(self.handle.raw()) as u32 + } + } + pub fn wait(&self) -> io::Result { use libc::{STILL_ACTIVE, INFINITE, WAIT_OBJECT_0}; use libc::{GetExitCodeProcess, WaitForSingleObject}; -- cgit 1.4.1-3-g733a5