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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_DIR_READER_LINUX_H_
#define BASE_DIR_READER_LINUX_H_
#pragma once
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <sys/syscall.h>
#include <unistd.h>
#include "base/logging.h"
#include "base/eintr_wrapper.h"
// See the comments in dir_reader_posix.h about this.
namespace base {
struct linux_dirent {
uint64_t d_ino;
int64_t d_off;
unsigned short d_reclen;
unsigned char d_type;
char d_name[0];
};
class DirReaderLinux {
public:
explicit DirReaderLinux(const char* directory_path)
: fd_(open(directory_path, O_RDONLY | O_DIRECTORY)),
offset_(0),
size_(0) {
}
~DirReaderLinux() {
if (fd_ >= 0) {
if (HANDLE_EINTR(close(fd_)))
RAW_LOG(ERROR, "Failed to close directory handle");
}
}
bool IsValid() const {
return fd_ >= 0;
}
// Move to the next entry returning false if the iteration is complete.
bool Next() {
if (size_) {
union {
const unsigned char *bufp;
const linux_dirent* dirent;
};
bufp = &buf_[offset_];
offset_ += dirent->d_reclen;
}
if (offset_ != size_)
return true;
const int r = syscall(__NR_getdents64, fd_, buf_, sizeof(buf_));
if (r == 0)
return false;
if (r == -1) {
DPLOG(FATAL) << "getdents64 returned an error: " << errno;
return false;
}
size_ = r;
offset_ = 0;
return true;
}
const char* name() const {
if (!size_)
return NULL;
union {
const unsigned char *bufp;
const linux_dirent* dirent;
};
bufp = &buf_[offset_];
return dirent->d_name;
}
int fd() const {
return fd_;
}
static bool IsFallback() {
return false;
}
private:
const int fd_;
unsigned char buf_[512];
size_t offset_, size_;
DISALLOW_COPY_AND_ASSIGN(DirReaderLinux);
};
} // namespace base
#endif // BASE_DIR_READER_LINUX_H_
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