From b9e3c243d476efa04479d253cfc4f76ecbdb6fe3 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 11 Jun 2010 11:00:38 -0400
Subject: [PATCH] KWSys: Teach Process to error on empty command

Do not try to execute a child with no command line.  Previously this led
to a silent hang.
---
 Source/kwsys/ProcessUNIX.c  | 8 ++++++++
 Source/kwsys/ProcessWin32.c | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/Source/kwsys/ProcessUNIX.c b/Source/kwsys/ProcessUNIX.c
index adadef15f..9c66a4486 100644
--- a/Source/kwsys/ProcessUNIX.c
+++ b/Source/kwsys/ProcessUNIX.c
@@ -720,6 +720,14 @@ void kwsysProcess_Execute(kwsysProcess* cp)
     return;
     }
 
+  /* Make sure we have something to run.  */
+  if(cp->NumberOfCommands < 1)
+    {
+    strcpy(cp->ErrorMessage, "No command");
+    cp->State = kwsysProcess_State_Error;
+    return;
+    }
+
   /* Initialize the control structure for a new process.  */
   if(!kwsysProcessInitialize(cp))
     {
diff --git a/Source/kwsys/ProcessWin32.c b/Source/kwsys/ProcessWin32.c
index c5ea6db20..5aa4d8bf6 100644
--- a/Source/kwsys/ProcessWin32.c
+++ b/Source/kwsys/ProcessWin32.c
@@ -987,6 +987,14 @@ void kwsysProcess_Execute(kwsysProcess* cp)
     return;
     }
 
+  /* Make sure we have something to run.  */
+  if(cp->NumberOfCommands < 1)
+    {
+    strcpy(cp->ErrorMessage, "No command");
+    cp->State = kwsysProcess_State_Error;
+    return;
+    }
+
   /* Initialize the control structure for a new process.  */
   if(!kwsysProcessInitialize(cp))
     {