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The 'read' and 'write' utilities are from a time before the VFS API as os/vfs.h was available. They rely on the (now removed) blocking semantics of the packet-stream interface. The only remaining legitimate use case of the direct interaction with the file-system session without VFS is the back end of gcov, which needs a way to exfiltrate the statistical data using a channel that is independent from the libc or the VFS. Issue #4390
132 lines
2.4 KiB
C++
132 lines
2.4 KiB
C++
/*
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* \brief Utilities
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* \author Norman Feske
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* \date 2012-04-11
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*/
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/*
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* Copyright (C) 2012-2017 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 _FILE_SYSTEM__UTIL_H_
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#define _FILE_SYSTEM__UTIL_H_
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#include <file_system_session/file_system_session.h>
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#include <os/path.h>
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namespace File_system {
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/**
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* Return true if character 'c' occurs in null-terminated string 'str'
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*/
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inline bool string_contains(char const *str, char c)
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{
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for (; *str; str++)
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if (*str == c)
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return true;
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return false;
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}
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/**
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* Return base-name portion of null-terminated path string
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*/
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static inline char const *basename(char const *path)
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{
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char const *start = path;
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for (; *path; path++)
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if (*path == '/')
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start = path + 1;
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return start;
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}
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/**
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* Return true if specified path contains at least path delimiters
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*/
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static inline bool contains_path_delimiter(char const *path)
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{
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for (; *path; path++)
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if (*path == '/')
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return true;
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return false;
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}
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/**
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* Return true if 'str' is a valid node name
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*/
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static inline bool valid_name(char const *str)
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{
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if (string_contains(str, '/')) return false;
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/* must have at least one character */
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if (str[0] == 0) return false;
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return true;
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}
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/**
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* Open a directory, ensuring all parent directories exists.
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*/
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static inline Dir_handle ensure_dir(Session &fs, char const *path)
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{
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try {
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return fs.dir(path, false);
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} catch (Lookup_failed) {
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try {
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return fs.dir(path, true);
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} catch (Lookup_failed) {
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Genode::Path<MAX_PATH_LEN> target(path);
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target.strip_last_element();
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fs.close(ensure_dir(fs, target.base()));
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}
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}
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return fs.dir(path, true);
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}
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class Handle_guard
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{
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private:
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Session &_session;
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Node_handle _handle;
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public:
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Handle_guard(Session &session, Node_handle handle)
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: _session(session), _handle(handle) { }
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~Handle_guard() { _session.close(_handle); }
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};
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class Packet_guard
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{
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private:
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Session::Tx::Source &_source;
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File_system::Packet_descriptor _packet;
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public:
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Packet_guard(Session::Tx::Source &source,
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File_system::Packet_descriptor packet)
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: _source(source), _packet(packet) { }
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~Packet_guard()
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{
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_source.release_packet(_packet);
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}
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};
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}
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#endif /* _FILE_SYSTEM__UTIL_H_ */
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