128 lines
2.9 KiB
C++
128 lines
2.9 KiB
C++
/*
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* \brief Rtc file system
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* \author Josef Soentgen
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* \date 2014-08-20
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*/
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/*
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* Copyright (C) 2014-2017 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__VFS__RTC_FILE_SYSTEM_H_
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#define _INCLUDE__VFS__RTC_FILE_SYSTEM_H_
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/* Genode includes */
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#include <rtc_session/connection.h>
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#include <vfs/file_system.h>
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namespace Vfs { class Rtc_file_system; }
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class Vfs::Rtc_file_system : public Single_file_system
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{
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private:
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Rtc::Connection _rtc;
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class Rtc_vfs_handle : public Single_vfs_handle
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{
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private:
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Rtc::Connection &_rtc;
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public:
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Rtc_vfs_handle(Directory_service &ds,
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File_io_service &fs,
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Genode::Allocator &alloc,
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Rtc::Connection &rtc)
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: Single_vfs_handle(ds, fs, alloc, 0),
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_rtc(rtc) { }
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/**
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* Read the current time from the Rtc session
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*
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* On each read the current time is queried and afterwards formated
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* as '%Y-%m-%d %H:%M\n'.
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*/
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Read_result read(char *dst, file_size count,
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file_size &out_count) override
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{
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enum { TIMESTAMP_LEN = 17 };
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if (seek() >= TIMESTAMP_LEN) {
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out_count = 0;
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return READ_OK;
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}
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Rtc::Timestamp ts = _rtc.current_time();
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char buf[TIMESTAMP_LEN+1];
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char *b = buf;
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unsigned n = Genode::snprintf(buf, sizeof(buf), "%04u-%02u-%02u %02u:%02u\n",
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ts.year, ts.month, ts.day, ts.hour, ts.minute);
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n -= seek();
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b += seek();
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file_size len = count > n ? n : count;
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Genode::memcpy(dst, b, len);
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out_count = len;
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return READ_OK;
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}
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Write_result write(char const *, file_size, file_size &) override
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{
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return WRITE_ERR_IO;
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}
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bool read_ready() { return true; }
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};
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public:
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Rtc_file_system(Vfs::Env &env, Genode::Xml_node config)
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:
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Single_file_system(NODE_TYPE_CHAR_DEVICE, name(), config),
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_rtc(env.env())
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{ }
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static char const *name() { return "rtc"; }
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char const *type() override { return "rtc"; }
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/*********************************
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** Directory-service interface **
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*********************************/
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Open_result open(char const *path, unsigned,
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Vfs_handle **out_handle,
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Allocator &alloc) override
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{
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if (!_single_file(path))
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return OPEN_ERR_UNACCESSIBLE;
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try {
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*out_handle = new (alloc)
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Rtc_vfs_handle(*this, *this, alloc, _rtc);
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return OPEN_OK;
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}
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catch (Genode::Out_of_ram) { return OPEN_ERR_OUT_OF_RAM; }
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catch (Genode::Out_of_caps) { return OPEN_ERR_OUT_OF_CAPS; }
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}
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Stat_result stat(char const *path, Stat &out) override
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{
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Stat_result result = Single_file_system::stat(path, out);
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out.mode |= 0444;
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return result;
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}
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};
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#endif /* _INCLUDE__VFS__RTC_FILE_SYSTEM_H_ */
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