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Operating Systems Solaris "Device busy" When Reopening Serial Port Post 302580967 by Jim Ryan on Sunday 11th of December 2011 12:15:47 PM
Old 12-11-2011
"Device busy" When Reopening Serial Port

Any help much appreciated. I am a Java developer, not a Solaris adept. I'm having an issue reopening serial port with the Java app I am developing.

I develop in Windows and deploy the app on Solaris 10 (Sunfire X4170 with Xeon.) On the target machine my app uses the two serial ports /dev/cua/comf1a and /dev/cua/comf1b. If a port cable is unplugged my app detects this (by heartbeats failing to be acknowledged) and closes and then reopens the port. There is no issue in Windows; the app can close and open the port again. But on Solaris, although the app has no trouble opening ports at launch, I get "Device busy" when the app tries to reopen the port, having closed it. I can then shut down and quickly restart the app, and it has no issue opening the ports again on restart. I am sure I am not keeping any ties between the app and the closed port; I am closing input streams and output streams. And there is no issue in Windows. So I think this is an OS-level issue. I have tried making the app wait 15 minutes after closing and before reopening; this doesn't help. I'm wondering whether Solaris has marked the port as in use by the app for the duration of the run of the app so that the port may be closed but not reopened, even by the same app itself.

Thank you for any help you can give me with this.
 

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Plack::Handler(3pm)					User Contributed Perl Documentation				       Plack::Handler(3pm)

NAME
Plack::Handler - Connects PSGI applications and Web servers SYNOPSIS
package Plack::Handler::AwesomeWebServer; sub new { my($class, %opt) = @_; ... return $self; } sub run { my($self, $app) = @_; # launch the AwesomeWebServer and run $app in the loop } # then from command line plackup -s AwesomeWebServer -a app.psgi DESCRIPTION
Plack::Handler defines an adapter (connector) interface to adapt plackup and Plack::Runner to various PSGI web servers, such as Apache2 for mod_perl and Standalone for HTTP::Server::PSGI. It is an empty class, and as long as they implement the methods defined as an Server adapter interface, they do not need to inherit Plack::Handler. If you write a new handler for existing web servers, I recommend you to include the full name of the server module after Plack::Handler prefix, like Plack::Handler::Net::Server::Coro if you write a handler for Net::Server::Coro. That way you'll be using plackup command line option like: plackup -s Net::Server::Coro that makes it easy to figure out which web server you're going to use. METHODS
new $server = FooBarServer->new(%args); Creates a new adapter object. %args can take arbitrary parameters to configure server environments but common parameters are: port Port number the server listens to. host Address the server listens to. Set to undef to listen any interface. run $server->run($app); Starts the server process and when a request comes in, run the PSGI application passed in $app in the loop. register_service $server->register_service($app); Optional interface if your server should run in parallel with other event loop, particularly AnyEvent. This is the same as "run" but doesn't run the main loop. SEE ALSO
rackup perl v5.14.2 2011-02-27 Plack::Handler(3pm)
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