| Summary: | Need a way to pass HANDLEs between processes on Windows | ||
|---|---|---|---|
| Product: | WebKit | Reporter: | Adam Roben (:aroben) <aroben> |
| Component: | WebKit2 | Assignee: | Nobody <webkit-unassigned> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | Normal | CC: | andersca |
| Priority: | P2 | Keywords: | InRadar, PlatformOnly |
| Version: | 528+ (Nightly build) | ||
| Hardware: | PC | ||
| OS: | Windows XP | ||
| Bug Depends on: | |||
| Bug Blocks: | 47499 | ||
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Description
Adam Roben (:aroben)
2010-10-11 12:16:23 PDT
In order to pass a HANDLE between processes, we'll need to call ::DuplicateHandle to copy the handle into the target process. But doing this requires knowing what the target process is, which is not known at argument-encoding time. Anders suggests that we use CoreIPC::Attachment for this. Specifically, we'd: A1) Make CoreIPC::Connection perform a handshake that exchanges process HANDLEs between the two ends of the connection (on Vista and newer we could perhaps use ::GetNamedPipeClientProcessId/::GetNamedPipeServerProcessId to simplify this) A2) Use the process HANDLE received in the handshake to call ::DuplicateHandle when sending the message I think another option that wouldn't require the handshake is: B1) Call ::DuplicateHandle to duplicate the HANDLE in the source process at argument-encoding time B2) Send both the HANDLE and the source process's PID in the message to the target process B3) When the message is received in the target process, call ::DuplicateHandle to copy the handle into the target process and pass DUPLICATE_CLOSE_SOURCE to close the HANDLE the source process made in (B1) I'm not positive that the ::DuplicateHandle call in (B3) will actually succeed, however. Maybe Windows doesn't allow it to be used like this. |