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/*
* Copyright 2003-2020 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_FS_FILESYSTEM_HXX
#define MPD_FS_FILESYSTEM_HXX
#include "Path.hxx"
#include "system/UniqueFileDescriptor.hxx"
#ifdef _WIN32
#include <fileapi.h>
#endif
#include <sys/stat.h>
#include <unistd.h>
class AllocatedPath;
/**
* Wrapper for open_cloexec() that uses #Path names.
*/
static inline UniqueFileDescriptor
OpenFile(Path file, int flags, int mode)
{
UniqueFileDescriptor fd;
fd.Open(file.c_str(), flags, mode);
return fd;
}
/*
* Wrapper for rename() that uses #Path names.
*
* Throws std::system_error on error.
*/
void
RenameFile(Path oldpath, Path newpath);
#ifndef _WIN32
/**
* Wrapper for stat() that uses #Path names.
*/
static inline bool
StatFile(Path file, struct stat &buf, bool follow_symlinks = true)
{
int ret = follow_symlinks
? stat(file.c_str(), &buf)
: lstat(file.c_str(), &buf);
return ret == 0;
}
#endif
/**
* Truncate a file that exists already. Throws std::system_error on
* error.
*/
void
TruncateFile(Path path);
/**
* Wrapper for unlink() that uses #Path names. Throws
* std::system_error on error.
*/
void
RemoveFile(Path path);
/**
* Wrapper for readlink() that uses #Path names.
*/
AllocatedPath
ReadLink(Path path);
#ifndef _WIN32
static inline bool
MakeFifo(Path path, mode_t mode)
{
return mkfifo(path.c_str(), mode) == 0;
}
/**
* Wrapper for access() that uses #Path names.
*/
static inline bool
CheckAccess(Path path, int mode)
{
return access(path.c_str(), mode) == 0;
}
#endif
/**
* Checks if #Path exists and is a regular file.
*/
static inline bool
FileExists(Path path, bool follow_symlinks = true)
{
#ifdef _WIN32
(void)follow_symlinks;
const auto a = GetFileAttributes(path.c_str());
return a != INVALID_FILE_ATTRIBUTES &&
(a & (FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_DEVICE)) == 0;
#else
struct stat buf;
return StatFile(path, buf, follow_symlinks) && S_ISREG(buf.st_mode);
#endif
}
/**
* Checks if #Path exists and is a directory.
*/
static inline bool
DirectoryExists(Path path, bool follow_symlinks = true)
{
#ifdef _WIN32
(void)follow_symlinks;
const auto a = GetFileAttributes(path.c_str());
return a != INVALID_FILE_ATTRIBUTES && (a & FILE_ATTRIBUTE_DIRECTORY);
#else
struct stat buf;
return StatFile(path, buf, follow_symlinks) && S_ISDIR(buf.st_mode);
#endif
}
/**
* Checks if #Path exists.
*/
static inline bool
PathExists(Path path)
{
#ifdef _WIN32
return GetFileAttributes(path.c_str()) != INVALID_FILE_ATTRIBUTES;
#else
return CheckAccess(path, F_OK);
#endif
}
#endif
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