173 lines
3.1 KiB
C++
173 lines
3.1 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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* \date 2013-11-11
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*/
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/*
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* Copyright (C) 2013-2017 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_H_
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#define _FILE_H_
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/* local includes */
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#include <node.h>
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#include <lx_util.h>
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namespace Lx_fs {
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using namespace File_system;
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class File;
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}
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class Lx_fs::File : public Node
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{
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private:
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int _fd;
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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 = 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 = 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 = 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 = 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 = 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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:
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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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~File()
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{
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close(_fd);
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}
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void update_modification_time(Timestamp const time) override
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{
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struct timespec ts[2] = {
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{ .tv_sec = (time_t)0, .tv_nsec = 0 },
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{ .tv_sec = (time_t)time.value, .tv_nsec = 0 }
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};
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/* silently ignore errors */
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futimens(_fd, (const timespec*)&ts);
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}
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size_t read(char *dst, size_t len, seek_off_t seek_offset) override
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{
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int ret = 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) override
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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 = 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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int ret = pwrite(_fd, src, len, seek_offset);
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return ret == -1 ? 0 : ret;
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}
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Status status() override
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{
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struct stat st { };
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if (fstat(_fd, &st) < 0) {
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st.st_size = 0;
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st.st_mtime = 0;
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}
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return {
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.size = (file_size_t)st.st_size,
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.type = File_system::Node_type::CONTINUOUS_FILE,
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.rwx = { .readable = (st.st_mode & S_IRUSR),
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.writeable = (st.st_mode & S_IWUSR),
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.executable = (st.st_mode & S_IXUSR) },
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.inode = inode(),
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.modification_time = { st.st_mtime }
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};
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}
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void truncate(file_size_t size) override
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{
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if (ftruncate(_fd, size)) /* nothing */ { }
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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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