Hi Bruno, Thank you for the reply. I have seen this documentation before. It says that two processes have to be related. Boost.Process enables processes to communicate with each other only if they are related: One process must have created the other. If you want two processes which are not related to exchange data you should use Boost.Interprocess http://www.boost.org/libs/interprocess/. After reading the above sentences, I did not further read Boost.Process. And Boost.Interprocess does not offer pipes from what I understood. I had used boost message queues for my work but due to a short coming in the boost message queues, I am looking for another IPC technique to replace them. The short coming I refer to in boost message queues is being not able to wait on a message queue. I mean that it seems to be not possible to get a file descriptor of a boost message queue. Best Regards, Rohini Chandra On Fri, Dec 17, 2010 at 6:47 PM, bruno romano wrote:

Boost.Process

http://www.highscore.de/cpp/process/

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Thank you Boris, but I need to setup IPC between two processes which are not child and parent. I had used boost message queues as of now for the same but I am not able to wait on the boost message queue as it is not possible to get a file descriptor of a boost message queue. To my understanding, native() method cannot be used on a boost message queues. Now, I want to use some other IPC technique other than boost message queues due to the above reason. So I thought of checking if pipe communication is possible between two unrelated processes using boost. Could you please help me if you have more information regarding this. Please let me know if you need more information to help me. Best Regards, Rohini Chandra On Sat, Dec 18, 2010 at 5:05 PM, Boris Schaeling wrote:

On Sat, 18 Dec 2010 11:52:19 +0100, rohini chandra pallapothu < rohinichandrap@gmail.com> wrote:

[...]I have seen this documentation before. It says that two processes

...

have to be related.

Rohini,

you can download the latest draft of Boost.Process from http://www.highscore.de/boost/gsoc2010/process.zip. This version provides stream behaviors to configure streams of a child process. Among others a stream behavior for named pipes is provided. You could use it like this:

named_pipe np("/tmp/mypipe"); stream_ends ends = np(input_stream); ... = ends.child.native(); ... = ends.parent.native();

The parameter passed to named_pipe::operator()() tells the stream behavior if the child handle should be configured for input or output. stream_ends is basically a std:pair without requiring developers to remember what the child and the parent handle is. And the method handle::native() (and handle::release()) can be used to get the file descriptor on Unix and the HANDLE on Windows.

HTH, Boris

[...]

...

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Thank you Boris for the help. I was also thinking of using native Linux IPC(message queues or pipes) if I cannot do it in boost. Best Regards , Rohini Chandra On Sun, Dec 19, 2010 at 1:04 AM, Boris Schaeling wrote:

On Sun, 19 Dec 2010 00:12:50 +0100, rohini chandra pallapothu < rohinichandrap@gmail.com> wrote:

[...]Now, I want to use some other IPC technique other than boost message

...

queues

due to the above reason. So I thought of checking if pipe communication is possible between two unrelated processes using boost.

Could you please help me if you have more information regarding this.

I think the fastest solution for you is to copy&paste the code from the stream behavior named_pipe in Boost.Process. One process needs to call mkfifo() and open() and the other process only open(). If you set the O_NONBLOCK flag with fcntl() you can even use asynchronous I/O with Boost.Asio (see boost::asio::posix::stream_descriptor). It's not a Boost solution but copying and adapting the code shouldn't take longer than a few minutes. :)

Boris

[...]

...

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Thank you Bruno. I have not seen these examples. I'll go through them and see if I can use them in my application Thank you once again. Best Regards, Rohini ChandratPM, bruno romano wrote:

Hi, you see this page ?

http://www.boost.org/doc/libs/1_44_0/doc/html/boost_asio/examples.html (several examples using boost.asio)

http://www.boost.org/doc/libs/1_44_0/doc/html/boost_asio/example/local/conne... (named_socket for linux)

http://www.boost.org/doc/libs/1_44_0/doc/html/boost_asio/example/local/strea... for linux)

http://www.boost.org/doc/libs/1_44_0/doc/html/boost_asio/example/local/strea... for linux)

Boost.Asio have asynchronous methods to read and write, and have a method native.

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