Add `command_len` argument to the Simple IPC API.
In my original Simple IPC API, I assumed that the request
would always be a null-terminated string of text characters.
The command arg was just a `const char *`.
I found a caller that would like to pass a binary command
to the daemon, so I want to ammend the Simple IPC API to
take `const char *command, size_t command_len` and pass
that to the daemon. (Really, the first arg should just be
a `void *` or `const unsigned byte *` to make that clearer.)
Note, the response side has always been a `struct strbuf`
which includes the buffer and length, so we already support
returning a binary answer. (Yes, it feels a little weird
returning a binary buffer in a `strbuf`, but it works.)
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Create Unix domain socket based implementation of "simple-ipc".
A set of `ipc_client` routines implement a client library to connect
to an `ipc_server` over a Unix domain socket, send a simple request,
and receive a single response. Clients use blocking IO on the socket.
A set of `ipc_server` routines implement a thread pool to listen for
and concurrently service client connections.
The server creates a new Unix domain socket at a known location. If a
socket already exists with that name, the server tries to determine if
another server is already listening on the socket or if the socket is
dead. If socket is busy, the server exits with an error rather than
stealing the socket. If the socket is dead, the server creates a new
one and starts up.
If while running, the server detects that its socket has been stolen
by another server, it automatically exits.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Create Windows implementation of "simple-ipc" using named pipes.
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
