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82 lines
1.8 KiB
C++
82 lines
1.8 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 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__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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/* libc includes */
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#include <time.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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public:
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Rtc_file_system(Xml_node config)
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:
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Single_file_system(NODE_TYPE_CHAR_DEVICE, name(), config)
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{ }
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static char const *name() { return "rtc"; }
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/********************************
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** File I/O service interface **
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********************************/
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Write_result write(Vfs_handle *, char const *, file_size,
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file_size &) override
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{
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return WRITE_ERR_IO;
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}
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/**
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* Read the current time from the RTC
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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(Vfs_handle *vfs_handle, char *dst, file_size count,
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file_size &out_count) override
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{
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time_t t = _rtc.current_time() / 1000000ULL;
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struct tm *tm = localtime(&t);
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char buf[16 + 1 + 1];
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Genode::snprintf(buf, sizeof(buf), "%04d-%02d-%02d %02d:%02d\n",
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1900 + tm->tm_year, /* years since 1900 */
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1 + tm->tm_mon, /* months since January [0-11] */
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tm->tm_mday, tm->tm_hour, tm->tm_min);
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file_size len = count > sizeof(buf) ? sizeof(buf) : count;
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Genode::memcpy(dst, buf, len);
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out_count = len;
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return READ_OK;
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}
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};
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#endif /* _INCLUDE__VFS__RTC_FILE_SYSTEM_H_ */
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