snapraid/cmdline/unix.h

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2019-01-07 14:06:15 +01:00
/*
* Copyright (C) 2011 Andrea Mazzoleni
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef __UNIX_H
#define __UNIX_H
#ifdef __linux__
#define HAVE_LINUX_DEVICE 1 /**< In Linux enables special device support. */
#define HAVE_DIRECT_IO 1 /**< Support O_DIRECT in open(). */
#endif
#define O_BINARY 0 /**< Not used in Unix. */
#define O_SEQUENTIAL 0 /**< In Unix posix_fadvise() shall be used. */
/**
* If nanoseconds are not supported, we report the special STAT_NSEC_INVALID value,
* to mark that it's undefined.
*/
#define STAT_NSEC_INVALID -1
/* Check if we have nanoseconds support */
#if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
#define STAT_NSEC(st) ((int)(st)->st_mtim.tv_nsec) /* Linux */
#elif HAVE_STRUCT_STAT_ST_MTIMENSEC
#define STAT_NSEC(st) ((int)(st)->st_mtimensec) /* NetBSD */
#elif HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC
#define STAT_NSEC(st) ((int)(st)->st_mtimespec.tv_nsec) /* FreeBSD, Mac OS X */
#else
#define STAT_NSEC(st) STAT_NSEC_INVALID
#endif
/**
* Open a file with the O_NOATIME flag to avoid to update the access time.
*/
int open_noatime(const char* file, int flags);
/**
* Check if the specified file is hidden.
*/
int dirent_hidden(struct dirent* dd);
/**
* Return a description of the file type.
*/
const char* stat_desc(struct stat* st);
/**
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* Return the alignment requirement for direct IO.
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*/
size_t direct_size(void);
#endif