From 0973bccfe2bf1140021a3f670974bf073bfb5eac Mon Sep 17 00:00:00 2001
From: Graydon Hoare <graydon@mozilla.com>
Date: Tue, 20 Mar 2012 12:38:57 -0700
Subject: [PATCH] Fail when there's an error starting a process. Close #1778.

---
 src/libcore/run.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/libcore/run.rs b/src/libcore/run.rs
index 58354bc49ca..693832fca9d 100644
--- a/src/libcore/run.rs
+++ b/src/libcore/run.rs
@@ -161,8 +161,10 @@ Spawns a process and waits for it to terminate
 The process id
 "]
 fn run_program(prog: str, args: [str]) -> int {
-    ret waitpid(spawn_process(prog, args, none, none,
-                              0i32, 0i32, 0i32));
+    let pid = spawn_process(prog, args, none, none,
+                            0i32, 0i32, 0i32);
+    if pid == -1 as pid_t { fail; }
+    ret waitpid(pid);
 }
 
 #[doc ="
@@ -190,7 +192,7 @@ fn start_program(prog: str, args: [str]) -> program {
                       pipe_input.in, pipe_output.out,
                       pipe_err.out);
 
-    if pid == -1i32 { fail; }
+    if pid == -1 as pid_t { fail; }
     libc::close(pipe_input.in);
     libc::close(pipe_output.out);
     libc::close(pipe_err.out);