#2 blocks forever in Ssh.close() if two or more instances used

[Norbert Buchmüller]

If you create more than one instances of pyssh,Ssh in the same process, then the process hangs when you close() any of them.

The problem is that each instance registers a signal handler to handle SIGCHLD, so each of them sees the signal, and each of them calls a blocking os.waitpid() on the pid its own SSH process. When the first SIGCHLD arrives, all the instances call a blocking os.waitpid(), even those which do not expect their SSH subprocess to exit.

The solution is to use a nonblocking os.waitpid() call.

[Norbert Buchmüller]

example code that fails because of this bug

[Norbert Buchmüller]

patch to fix the bug

[Norbert Buchmüller]

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File Added: pyssh0.3-sighandler_bug.diff