113 lines
2.8 KiB
C++
113 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) 2011-2017 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 Affero General Public License version 3.
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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/rpc_client.h>
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#include <base/attached_dataspace.h>
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#include <terminal_session/terminal_session.h>
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namespace Terminal { class Session_client; }
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class Terminal::Session_client : public Genode::Rpc_client<Session>
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{
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private:
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Genode::Lock _lock { };
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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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Genode::Attached_dataspace _io_buffer;
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public:
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Session_client(Genode::Region_map &local_rm, Genode::Capability<Session> cap)
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:
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Genode::Rpc_client<Session>(cap),
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_io_buffer(local_rm, call<Rpc_dataspace>())
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{ }
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Size size() override { return call<Rpc_size>(); }
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bool avail() override { return call<Rpc_avail>(); }
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Genode::size_t read(void *buf, Genode::size_t buf_size) override
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{
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Genode::Lock::Guard _guard(_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.local_addr<char>(), 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) override
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{
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Genode::Lock::Guard _guard(_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 payload_bytes = Genode::min(num_bytes - written_bytes,
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_io_buffer.size());
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Genode::memcpy(_io_buffer.local_addr<char>(),
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src + written_bytes, payload_bytes);
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/* tell server to pick up new I/O buffer content */
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Genode::size_t written_payload_bytes = call<Rpc_write>(payload_bytes);
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written_bytes += written_payload_bytes;
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if (written_payload_bytes != payload_bytes)
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return written_bytes;
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}
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return written_bytes;
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}
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void connected_sigh(Genode::Signal_context_capability cap) override
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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) override
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{
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call<Rpc_read_avail_sigh>(cap);
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}
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void size_changed_sigh(Genode::Signal_context_capability cap) override
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{
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call<Rpc_size_changed_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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#endif /* _INCLUDE__TERMINAL_SESSION__CLIENT_H_ */
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