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121 lines
2.8 KiB
C++
121 lines
2.8 KiB
C++
/*
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* \brief Client-side Terminal session interface
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* \author Norman Feske
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* \date 2011-08-11
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*/
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/*
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* Copyright (C) 2011-2012 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__TERMINAL_SESSION__CLIENT_H_
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#define _INCLUDE__TERMINAL_SESSION__CLIENT_H_
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/* Genode includes */
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#include <util/misc_math.h>
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#include <util/string.h>
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#include <base/lock.h>
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#include <base/env.h>
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#include <base/rpc_client.h>
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#include <terminal_session/terminal_session.h>
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namespace Terminal {
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class Session_client : public Genode::Rpc_client<Session>
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{
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private:
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/**
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* Shared-memory buffer used for carrying the payload
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* of read/write operations
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*/
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struct Io_buffer
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{
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Genode::Dataspace_capability ds_cap;
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char *base;
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Genode::size_t size;
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Genode::Lock lock;
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Io_buffer(Genode::Dataspace_capability ds_cap)
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:
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ds_cap(ds_cap),
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base(Genode::env()->rm_session()->attach(ds_cap)),
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size(ds_cap.call<Genode::Dataspace::Rpc_size>())
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{ }
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~Io_buffer()
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{
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Genode::env()->rm_session()->detach(base);
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}
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};
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Io_buffer _io_buffer;
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public:
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Session_client(Genode::Capability<Session> cap)
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:
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Genode::Rpc_client<Session>(cap),
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_io_buffer(call<Rpc_dataspace>())
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{ }
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Size size() { return call<Rpc_size>(); }
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bool avail() { return call<Rpc_avail>(); }
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Genode::size_t read(void *buf, Genode::size_t buf_size)
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{
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Genode::Lock::Guard _guard(_io_buffer.lock);
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/* instruct server to fill the I/O buffer */
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Genode::size_t num_bytes = call<Rpc_read>(buf_size);
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/* copy-out I/O buffer */
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num_bytes = Genode::min(num_bytes, buf_size);
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Genode::memcpy(buf, _io_buffer.base, num_bytes);
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return num_bytes;
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}
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Genode::size_t write(void const *buf, Genode::size_t num_bytes)
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{
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Genode::Lock::Guard _guard(_io_buffer.lock);
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Genode::size_t written_bytes = 0;
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char const * const src = (char const *)buf;
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while (written_bytes < num_bytes) {
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/* copy payload to I/O buffer */
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Genode::size_t n = Genode::min(num_bytes - written_bytes,
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_io_buffer.size);
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Genode::memcpy(_io_buffer.base, src + written_bytes, n);
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/* tell server to pick up new I/O buffer content */
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call<Rpc_write>(n);
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written_bytes += n;
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}
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return num_bytes;
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}
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void connected_sigh(Genode::Signal_context_capability cap)
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{
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call<Rpc_connected_sigh>(cap);
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}
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void read_avail_sigh(Genode::Signal_context_capability cap)
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{
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call<Rpc_read_avail_sigh>(cap);
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}
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Genode::size_t io_buffer_size() const { return _io_buffer.size; }
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};
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}
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#endif /* _INCLUDE__TERMINAL_SESSION__CLIENT_H_ */
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