mirror of
https://github.com/matrix-construct/construct
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41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_FS_DEV_H
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namespace ircd::fs::dev
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{
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using major_minor = std::pair<ulong, ulong>;
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// Convert device ID's with the major(3) / minor(3) / makedev(3)
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ulong id(const major_minor &);
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major_minor id(const ulong &id);
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// Convert device id integers into a string used as the directory name in sysfs(5)
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string_view sysfs_id(const mutable_buffer &out, const major_minor &);
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string_view sysfs_id(const mutable_buffer &out, const ulong &);
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// Read data for a device from sysfs; path is relative to /sys/dev/block/$id/...
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string_view sysfs(const mutable_buffer &out, const ulong &id, const string_view &path);
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template<class T = size_t, size_t bufmax = 32> T sysfs(const ulong &id, const string_view &path);
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}
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/// Return a lex_cast'able (an integer) from a sysfs target.
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template<class T,
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size_t bufmax>
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T
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ircd::fs::dev::sysfs(const ulong &id,
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const string_view &path)
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{
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char buf[bufmax];
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const auto value(sysfs(buf, id, path));
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return lex_cast<T>(rstrip(value, '\n'));
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}
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