From: H. Peter Anvin <hpa@zytor.com>
Date: Wed, 26 Mar 2008 22:12:19 +0000 (-0700)
Subject: [PXEXT] Change the PXE return code for EWOULDBLOCK
X-Git-Tag: v0.9.4~185
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61ee294875fabf3bcab5fff7e4f6f2c0e0dfa96f;p=thirdparty%2Fipxe.git

[PXEXT] Change the PXE return code for EWOULDBLOCK

Change the PXE return code for EWOULDBLOCK from PXENV_STATUS_FAILURE
to PXENV_STATUS_TFTP_OPEN.  This code is only used by the FILE_READ
PXEXT call, and is necessary to distinguish "error" from "no data" in
that call.

(The only other nonblocking call is UDP_READ, where the caller doesn't
care about the distinction, however, gPXE doesn't use EWOULDBLOCK
internally to represent this condition in that code.)
---

diff --git a/src/include/errno.h b/src/include/errno.h
index 03d1ebd6d..d23b93ee0 100644
--- a/src/include/errno.h
+++ b/src/include/errno.h
@@ -448,8 +448,8 @@ extern char missing_errfile_declaration[] __attribute__ (( deprecated ));
 /** Text file busy */
 #define ETXTBSY			( ERRFILE | PXENV_STATUS_FAILURE | 0x4d000000 )
 
-/** Operation would block */
-#define EWOULDBLOCK		( ERRFILE | PXENV_STATUS_FAILURE | 0x4e000000 )
+/** Operation would block (different from EAGAIN!) */
+#define EWOULDBLOCK		( ERRFILE | PXENV_STATUS_TFTP_OPEN | 0x4e000000 )
 
 /** Improper link */
 #define EXDEV			( ERRFILE | PXENV_STATUS_FAILURE | 0x4f000000 )