From b10e06166ef8a71edf5cf1d61a94b6639880eb05 Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jackpot51@gmail.com>
Date: Fri, 13 Jan 2017 15:41:50 -0700
Subject: Add try_wait to Redox process

---
 src/libstd/sys/redox/process.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src/libstd/sys')

diff --git a/src/libstd/sys/redox/process.rs b/src/libstd/sys/redox/process.rs
index 849f51013e6..50dcd44b42e 100644
--- a/src/libstd/sys/redox/process.rs
+++ b/src/libstd/sys/redox/process.rs
@@ -501,4 +501,18 @@ impl Process {
         self.status = Some(ExitStatus(status as i32));
         Ok(ExitStatus(status as i32))
     }
+
+    pub fn try_wait(&mut self) -> io::Result<ExitStatus> {
+        if let Some(status) = self.status {
+            return Ok(status)
+        }
+        let mut status = 0;
+        let pid = cvt(syscall::waitpid(self.pid, &mut status, syscall::WNOHANG))?;
+        if pid == 0 {
+            Err(io::Error::from_raw_os_error(syscall::EWOULDBLOCK))
+        } else {
+            self.status = Some(ExitStatus(status as i32));
+            Ok(ExitStatus(status as i32))
+        }
+    }
 }
-- 
cgit 1.4.1-3-g733a5