Tanaka Akira
3/28/2006 1:48:00 AM
In article <20060320162018.GG5960@diehard.n-r-g.com>,
Claudio Jeker <cjeker@diehard.n-r-g.com> writes:
> I'm a bit stuck with this porblem:
> I need to write data to a process and then wait for the exit code of it to
> see if it was successful or not.
>
> Now I can IO.popen the process but there is no pclose instance method to
> get the exitcode back. Additionally my workaround via Process.waitpid2 does
> not work either. I think io.close does already all the cleanup.
$? can be used after close.
I hope this documentation helps.
Index: io.c
===================================================================
RCS file: /src/ruby/io.c,v
retrieving revision 1.246.2.97
diff -u -p -r1.246.2.97 io.c
--- io.c 14 Feb 2006 02:23:33 -0000 1.246.2.97
+++ io.c 28 Mar 2006 01:47:15 -0000
@@ -2149,6 +2149,9 @@ rb_io_close(io)
* an <code>IOError</code> is raised if such an attempt is made. I/O
* streams are automatically closed when they are claimed by the
* garbage collector.
+ *
+ * If <em>ios</em> is opened by <code>IO.popen</code>,
+ * <code>close</code> sets <code>$?</code>.
*/
static VALUE
@@ -3062,7 +3065,9 @@ retry:
*
* If a block is given, Ruby will run the command as a child connected
* to Ruby with a pipe. Ruby's end of the pipe will be passed as a
- * parameter to the block. In this case <code>IO::popen</code> returns
+ * parameter to the block.
+ * At the end of block, Ruby close the pipe and sets <code>$?</code>.
+ * In this case <code>IO::popen</code> returns
* the value of the block.
*
* If a block is given with a <i>cmd_string</i> of ``<code>-</code>'',
@@ -3078,6 +3083,7 @@ retry:
* puts "Parent is #{Process.pid}"
* IO.popen ("date") { |f| puts f.gets }
* IO.popen("-") {|f| $stderr.puts "#{Process.pid} is here, f is #{f}"}
+ * p $?
*
* <em>produces:</em>
*
@@ -3086,6 +3092,7 @@ retry:
* Wed Apr 9 08:53:52 CDT 2003
* 26169 is here, f is
* 26166 is here, f is #<IO:0x401b3d44>
+ * #<Process::Status: pid=26166,exited(0)>
*/
static VALUE
--
Tanaka Akira