linux-kernel - [PATCH] Remove OPEN

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Date:	Wed, 11 Jul 2007 17:59:14 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Remove OPEN_MAX

The OPEN_MAX macro in limits.h should not be there.  It claims to be the
limit on file descriptors in a process, but its value is wrong for that.
There is no constant value, but a variable resource limit (RLIMIT_NOFILE).
Nothing in the kernel uses OPEN_MAX except things that are wrong to do so.
I've submitted other patches to remove those uses.

The proper thing to do according to POSIX is not to define OPEN_MAX at all.
The sysconf (_SC_OPEN_MAX) implementation works by calling getrlimit.

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 include/linux/limits.h |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/include/linux/limits.h b/include/linux/limits.h
index eaf2e09..c4b4e57 100644
--- a/include/linux/limits.h
+++ b/include/linux/limits.h
@@ -6,7 +6,6 @@
 #define NGROUPS_MAX    65536	/* supplemental group IDs are available */
 #define ARG_MAX       131072	/* # bytes of args + environ for exec() */
 #define CHILD_MAX        999    /* no limit :-) */
-#define OPEN_MAX         256	/* # open files a process may have */
 #define LINK_MAX         127	/* # links a file may have */
 #define MAX_CANON        255	/* size of the canonical input queue */
 #define MAX_INPUT        255	/* size of the type-ahead buffer */
-
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