From: Bruno Haible <bruno@clisp.org>
Date: Sun, 17 Apr 2011 21:16:13 +0000 (+0200)
Subject: nonblocking: Add comment.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e9da144137c07d2ec6f94745a347f771d14d2a10;p=pspp

nonblocking: Add comment.

* lib/fcntl.in.h (O_NONBLOCK): Add comment.
---

diff --git a/ChangeLog b/ChangeLog
index d0923da0e9..1f09ff8458 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2011-04-17  Bruno Haible  <bruno@clisp.org>
+
+	nonblocking: Add comment.
+	* lib/fcntl.in.h (O_NONBLOCK): Add comment.
+
 2011-04-17  Bruno Haible  <bruno@clisp.org>
 
 	nonblocking: Add tests for sockets.
diff --git a/lib/fcntl.in.h b/lib/fcntl.in.h
index 971316fc05..ce7c8c016c 100644
--- a/lib/fcntl.in.h
+++ b/lib/fcntl.in.h
@@ -218,6 +218,9 @@ _GL_WARN_ON_USE (openat, "openat is not portable - "
 # define O_NONBLOCK O_NDELAY
 #endif
 
+/* If the gnulib module 'nonblocking' is in use, guarantee a working non-zero
+   value of O_NONBLOCK.  Otherwise, O_NONBLOCK is defined (above) to O_NDELAY
+   or to 0 as fallback.  */
 #if @GNULIB_NONBLOCKING@
 # if O_NONBLOCK
 #  define GNULIB_defined_O_NONBLOCK 0