From 316a0aa03d8dda2f7b8d901602d515fbde9010be Mon Sep 17 00:00:00 2001
From: knu <knu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 29 Mar 2010 17:41:32 +0000
Subject: * prelude.rb (Process.daemon): New method.

* .document: Add prelude.rb.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@27093 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 .document  |  3 +++
 ChangeLog  |  6 ++++++
 NEWS       |  4 ++++
 prelude.rb | 35 +++++++++++++++++++++++++++++++++++
 4 files changed, 48 insertions(+)

diff --git a/.document b/.document
index 230c50e387..f73474c126 100644
--- a/.document
+++ b/.document
@@ -6,6 +6,9 @@
 # Process all the C source files
 *.c
 
+# prelude
+prelude.rb
+
 # the lib/ directory (which has its own .document file)
 
 lib
diff --git a/ChangeLog b/ChangeLog
index 2335d02654..aa579796f0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Mar 30 02:40:31 2010  Akinori MUSHA  <knu@iDaemons.org>
+
+	* prelude.rb (Process.daemon): New method.
+
+	* .document: Add prelude.rb.
+
 Mon Mar 29 17:38:24 2010  Keiju Ishitsuka  <keiju@ruby-lang.org>
 
 	* ext/rational/lib/rational.rb: fix [Bug #1397].
diff --git a/NEWS b/NEWS
index 5e561cdfb5..1152b248cd 100644
--- a/NEWS
+++ b/NEWS
@@ -102,6 +102,10 @@ with all sufficient information, see the ChangeLog file.
 
     New method primarily for use in the case-when construct.
 
+  * Process.daemon
+
+    New method.
+
   * Range#cover?
 
     New alias to #include? for the forward compatibility with 1.9, in
diff --git a/prelude.rb b/prelude.rb
index 2265a4b9d1..cbdddef8ab 100644
--- a/prelude.rb
+++ b/prelude.rb
@@ -1 +1,36 @@
 # currently empty
+
+module Process
+  # call-seq:
+  #    Process.daemon()			       => 0
+  #    Process.daemon(nochdir=nil,noclose=nil) => 0
+  # 
+  # Detach the process from controlling terminal and run in
+  # the background as system daemon.  Unless the argument
+  # nochdir is true (i.e. non false), it changes the current
+  # working directory to the root ("/"). Unless the argument
+  # noclose is true, daemon() will redirect standard input,
+  # standard output and standard error to /dev/null.
+  # Return zero on success, or raise one of Errno::*.
+  def self.daemon(nochdir = nil, noclose = nil)
+    if $SAFE >= 2
+      raise SecurityError, "Insecure operation `%s' at level %d", __method__, $SAFE
+    end
+
+    fork && exit!(0)
+
+    Process.setsid()
+
+    fork && exit!(0)
+
+    Dir.chdir('/') unless nochdir
+
+    File.open('/dev/null', 'r+') { |f|
+      STDIN.reopen(f)
+      STDOUT.reopen(f)
+      STDERR.reopen(f)
+    } unless noclose
+
+    return 0
+  end
+end
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