From 9974cb96d3c2ca18ab27aa37081fa4a8b37cb074 Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 1 Nov 2005 13:04:35 +0000
Subject: * eval.c (rb_call_super): should call method_missing if super is  
 called from Kernel method.

* eval.c (exec_under): frame during eval should preserve external
  information.

* configure.in: use proper option for Sun linker. A patch from
  Shinya Kuwamura <kuwa@labs.fujitsu.com>.  [ruby-dev:27603]

* numeric.c (fix_rshift): RDoc fix.  [ruby-core:6351]

* util.h (strtod): add #undef for platforms defines strtod()
  macro.   [ruby-dev:27563]

* ext/etc/etc.c: document update from mathew <meta@pobox.com>.
  [ruby-core:06473]

* ext/fcntl/fcntl.c: ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9490 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/fcntl/fcntl.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

(limited to 'ext/fcntl')

diff --git a/ext/fcntl/fcntl.c b/ext/fcntl/fcntl.c
index d48630fc66..57cca103f4 100644
--- a/ext/fcntl/fcntl.c
+++ b/ext/fcntl/fcntl.c
@@ -34,6 +34,81 @@ pack up your own arguments to pass as args for locking functions, etc.
 #include "ruby.h"
 #include <fcntl.h>
 
+/* Fcntl loads the constants defined in the system's <fcntl.h> C header
+ * file, and used with both the fcntl(2) and open(2) POSIX system calls.
+ *
+ * Copyright (C) 1997-2001 Yukihiro Matsumoto
+ *
+ * Documented by mathew <meta@pobox.com>
+ *
+ * = Usage
+ * 
+ * To perform a fcntl(2) operation, use IO::fcntl in the core classes.
+ *
+ * To perform an open(2) operation, use IO::sysopen.
+ *
+ * The set of operations and constants available depends upon specific OS
+ * platform. Some values listed below may not be supported on your system.
+ *
+ * The constants supported by Ruby for use with IO::fcntl are:
+ *
+ * - F_DUPFD - duplicate a close-on-exec file handle to a non-close-on-exec
+ *   file handle.
+ *
+ * - F_GETFD - read the close-on-exec flag of a file handle.
+ *
+ * - F_SETFD - set the close-on-exec flag of a file handle.
+ *
+ * - FD_CLOEXEC - the value of the close-on-exec flag.
+ *
+ * - F_GETFL - get file descriptor flags.
+ *
+ * - F_SETFL - set file descriptor flags.
+ *
+ * - O_APPEND, O_NONBLOCK, etc (see below) - file descriptor flag
+ *   values for the above.
+ *
+ * - F_GETLK - determine whether a given region of a file is locked.
+ *
+ * - F_SETLK - acquire a lock on a region of a file.
+ *
+ * - F_SETLKW - acquire a lock on a region of a file, waiting if necessary.
+ *
+ * - F_RDLCK, F_WRLCK, F_UNLCK - types of lock for the above.
+ *
+ * The constants supported by Ruby for use with IO::sysopen are:
+ *
+ * - O_APPEND - open file in append mode.
+ *
+ * - O_NOCTTY - open tty without it becoming controlling tty.
+ *
+ * - O_CREAT - create file if it doesn't exist.
+ *
+ * - O_EXCL - used with O_CREAT, fail if file exists.
+ *
+ * - O_TRUNC - truncate file on open.
+ *
+ * - O_NONBLOCK / O_NDELAY - open in non-blocking mode.
+ *
+ * - O_RDONLY - open read-only.
+ *
+ * - O_WRONLY - open write-only.
+ *
+ * - O_RDWR - open read-write.
+ *
+ * - O_ACCMODE - mask to extract read/write flags.
+ *
+ * Example:
+ * 
+ *   require 'fcntl'
+ *
+ *   fd = IO::sysopen('/tmp/tempfile', 
+ *        Fcntl::O_WRONLY | Fcntl::O_EXCL | Fcntl::O_CREAT)
+ *   f = IO.open(fd)
+ *   f.syswrite("TEMP DATA")
+ *   f.close
+ *
+ */
 void
 Init_fcntl()
 {
-- 
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