akr	2013-04-03 20:55:18 +0900 (Wed, 03 Apr 2013)

  New Revision: 40083

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=40083

  Log:
    * process.c: Describe the behavior which Ruby invokes a commandline
      directly without shell if the commandline is simple enough.
      [ruby-core:50459] [Bug #7489]

  Modified files:
    trunk/ChangeLog
    trunk/process.c

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 40082)
+++ ChangeLog	(revision 40083)
@@ -1,3 +1,9 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Wed Apr  3 20:52:49 2013  Tanaka Akira  <akr@f...>
+
+	* process.c: Describe the behavior which Ruby invokes a commandline
+	  directly without shell if the commandline is simple enough.
+	  [ruby-core:50459] [Bug #7489]
+
 Wed Apr  3 20:27:37 2013  Tanaka Akira  <akr@f...>
 
 	* ext/extmk.rb (extmake): Invoke Logging::log_close in a ensure
Index: process.c
===================================================================
--- process.c	(revision 40082)
+++ process.c	(revision 40083)
@@ -2349,6 +2349,12 @@ static int rb_exec_without_timer_thread( https://github.com/ruby/ruby/blob/trunk/process.c#L2349
  *  The standard shell means always <code>"/bin/sh"</code> on Unix-like systems,
  *  <code>ENV["RUBYSHELL"]</code> or <code>ENV["COMSPEC"]</code> on Windows NT series, and
  *  similar.
+ *  If _commandline_ is simple enough,
+ *  no meta characters, no shell reserved word and no special built-in,
+ *  Ruby invokes the command directly without shell.
+ *  You can force shell invocation by adding ";" for _commandline_ (because ";" is a meta characetr).
+ *  Note that this behavior is observable by pid obtained
+ *  (return value of spawn() and IO#pid for IO.popen) is the pid of the invoked command, not shell.
  *
  *  If two or more +string+ given,
  *  the first is taken as a command name and

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