157 lines
2.8 KiB
C++
157 lines
2.8 KiB
C++
/**
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* \brief File node
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* \author Norman Feske
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* \author Christian Helmuth
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* \auhtor Sebastian Sumpf
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* \date 2013-11-11
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*/
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/*
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* Copyright (C) 2013-2014 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 _FILE_H_
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#define _FILE_H_
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/* Genode includes */
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#include <file_system/util.h>
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#include "node.h"
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namespace File_system {
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class File;
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}
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class File_system::File : public Node
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{
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private:
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int _fd;
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int _access_mode(Mode const &mode)
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{
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switch (mode) {
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case STAT_ONLY:
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case READ_ONLY: return O_RDONLY;
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case WRITE_ONLY: return O_WRONLY;
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case READ_WRITE: return O_RDWR;
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default: return O_RDONLY;
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}
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}
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unsigned long _inode(int dir, char const *name, bool create)
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{
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int ret;
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if (create) {
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mode_t ugo = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
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ret = rump_sys_mknodat(dir, name, S_IFREG | ugo, 0);
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if (ret == -1 && errno != EEXIST)
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throw No_space();
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}
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struct stat s;
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ret = rump_sys_fstatat(dir, name, &s, 0);
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if (ret == -1)
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throw Lookup_failed();
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return s.st_ino;
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}
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unsigned long _inode_path(char const *path)
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{
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int ret;
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struct stat s;
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ret = rump_sys_stat(path, &s);
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if (ret == -1)
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throw Lookup_failed();
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return s.st_ino;
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}
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int _open(int dir, char const *name, Mode mode)
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{
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int fd = rump_sys_openat(dir, name, _access_mode(mode));
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if (fd == -1)
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throw Lookup_failed();
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return fd;
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}
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int _open_path(char const *path, Mode mode)
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{
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int fd = rump_sys_open(path, _access_mode(mode));
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if (fd == -1)
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throw Lookup_failed();
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return fd;
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}
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public:
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File(int dir,
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char const *name,
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Mode mode,
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bool create)
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: Node(_inode(dir, name, create)),
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_fd(_open(dir, name, mode))
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{
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Node::name(name);
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}
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File(char const *path, Mode mode)
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:
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Node(_inode_path(path)),
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_fd(_open_path(path, mode))
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{
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Node::name(basename(path));
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}
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virtual ~File() { rump_sys_close(_fd); }
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size_t read(char *dst, size_t len, seek_off_t seek_offset)
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{
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ssize_t ret = rump_sys_pread(_fd, dst, len, seek_offset);
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return ret == -1 ? 0 : ret;
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}
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size_t write(char const *src, size_t len, seek_off_t seek_offset)
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{
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/* should we append? */
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if (seek_offset == ~0ULL) {
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off_t off = rump_sys_lseek(_fd, 0, SEEK_END);
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if (off == -1)
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return 0;
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seek_offset = off;
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}
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ssize_t ret = rump_sys_pwrite(_fd, src, len, seek_offset);
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return ret == -1 ? 0 : ret;
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}
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file_size_t length() const
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{
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struct stat s;
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if(rump_sys_fstat(_fd, &s) < 0)
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return 0;
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return s.st_size;
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}
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void truncate(file_size_t size)
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{
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rump_sys_ftruncate(_fd, size);
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mark_as_updated();
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}
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};
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#endif /* _FILE_H_ */
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