On Sep 17, 4:14 pm, [EMAIL PROTECTED] wrote: > Hello, > > I want to write a terminal program in pygtk. It will run a subprocess, > display everything it writes in its standard output and standard > error, and let the user write text into its standard input. > > The question is, how can I know if the process wrote something to its > output, and how much it wrote? I can't just call read(), since it will > block my process.
The solution is not simple. You may try a separate thread to do the reading (so that you can afford to block that single thread). You can also run into other I/O deadlocks with a simple solution (ie if you try to feed the whole stdin before reading any stdout, your stdin feeding can block because the process's stdout is full -- it's a bit confusing but for large stdin/stdout, a deadlock is very much possible). Did you try subprocess.Popen.communicate() ? Under the covers it should take care of th ese deadlock issues. It may read and buffer the whole stdout/stderr, so don't use it if the process generates infinite/ very-large stdout/stderr. If the process you launch needs two way communication, like an ssh/ftp session (where the stdin depends on process's prior stdout), the only viable solution is to simulate a human (e.g. pexpect module) Karthik > > Thanks, > Noam -- http://mail.python.org/mailman/listinfo/python-list
