From 97e0b1e08f1cebac32835aed6546cacee2d4468a Mon Sep 17 00:00:00 2001
From: John Hodge <tpg@mutabah.net>
Date: Sat, 27 Jul 2013 19:02:32 +0800
Subject: [PATCH] Usermode - Handled read failures in readline correctly

---
 Usermode/Applications/CLIShell_src/main.c    | 5 +++++
 Usermode/Libraries/libreadline.so_src/main.c | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Usermode/Applications/CLIShell_src/main.c b/Usermode/Applications/CLIShell_src/main.c
index 501359a8..1a501ad1 100644
--- a/Usermode/Applications/CLIShell_src/main.c
+++ b/Usermode/Applications/CLIShell_src/main.c
@@ -8,6 +8,7 @@
 #include <string.h>
 #include "header.h"
 #include <readline.h>
+#include <errno.h>
 
 #define _stdin	0
 #define _stdout	1
@@ -80,6 +81,10 @@ int main(int argc, char *argv[], char **envp)
 		// Read Command line
 		sCommandStr = Readline( readline_state );
 		printf("\n");
+		if( !sCommandStr ) {
+			perror("Readline");
+			return 1;
+		}
 		
 		// Parse Command Line into arguments
 		iArgCount = Parse_Args(sCommandStr, saArgs);
diff --git a/Usermode/Libraries/libreadline.so_src/main.c b/Usermode/Libraries/libreadline.so_src/main.c
index a12abc59..45669355 100644
--- a/Usermode/Libraries/libreadline.so_src/main.c
+++ b/Usermode/Libraries/libreadline.so_src/main.c
@@ -10,6 +10,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <errno.h>
 
 #define STDIN_FD	0
 #define STDOUT_FD	1
@@ -105,6 +106,7 @@ char *Readline_NonBlock(tReadline *Info)
 	}
 	
 	// Return NULL when command is still being edited
+	errno = EAGAIN;
 	return NULL;
 }
 
@@ -116,7 +118,7 @@ char *Readline(tReadline *Info)
 	struct ptymode	mode = {.InputMode = 0, .OutputMode = 0};
 	_SysIOCtl(STDIN_FD, PTY_IOCTL_SETMODE, &mode);
 	
-	while( NULL == (ret = Readline_NonBlock(Info)) );
+	while( NULL == (ret = Readline_NonBlock(Info)) && errno == EAGAIN );
 
 	// stty +echo,canon
 	mode.InputMode = PTYIMODE_CANON|PTYIMODE_ECHO;
-- 
2.20.1