[lldb-dev] [Bug 22497] New: Create test that floods target with SBProcess.PutSTDIN

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22497

            Bug ID: 22497
           Summary: Create test that floods target with SBProcess.PutSTDIN
           Product: lldb
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at cs.uiuc.edu
          Reporter: vince at nethacker.com
    Classification: Unclassified

SBProcess.PutSTDIN naively sends stdin to a remote process.  This fixes many
use cases.  I think that if you flood the remote target with stdin, the remote
debug server will eventually block, which will potentially cause a deadlock.

There are two ways to improve this in remote debugging scenarios:

1) change the pty master file handle on the remote debug server to non-blocking
(if possible) and just return an error if there is a partial write

2) the better and much more complicated fix is for the debug server to create a
thread that reads from a circular buffer and writes it to a the pty master file
 handle in blocking mode and advertises available space in the circular buffer
after every successful write.  When SBProcess.PutSTDIN is called on a remote
host with insufficient window space, the thread calling SBProcess.PutSTDIN
blocks until there is sufficient window space.

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