/**
* slibc — Yet another C library
* Copyright © 2015, 2016 Mattias Andrée (m@maandree.se)
*
* 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 _FCNTL_H
#define _FCNTL_H
#include <slibc/version.h>
#include <slibc/features.h>
#define __NEED_off_t
#define __NEED_pid_t
#define __NEED_mode_t
#include <bits/types.h>
/**
* Create a new file and open it for writing, or
* if the file already exists, open it for rewriting,
* in which the file will be emptied.
*
* `creat(path, mode)` is identical to
* `open(path, O_WRONLY | O_CREAT | O_TRUNC, mode)`.
*
* @etymology (Creat)e file!
*
* @param path The pathname of the file to open.
* @param mode File permissions for the new file.
* @return The file descriptor to the opened file, -1 on error.
*
* @throws Any error specified for open(3) except for `EEXIST`.
*
* @since Always.
*/
int creat(const char*, mode_t)
__GCC_ONLY(__attribute__((__nonnull__, __warn_unused_result__)))
__deprecated("Use 'open' instead.");
#if defined(__SLIBC_SOURCE)
/**
* Reopen a file via its file descriptor. The old file descriptor
* is closed and replace with the new open file descriptor.
*
* This function call is different from the `dup` function-family
* in two ways: (1) you can select news flags, for example, if
* `fd` was read-only, the new file descriptor can be write-only,
* and (2) the file descriptor is not duplicated, the file is
* reopened.
*
* This function is useful if you want to reopen a file you do
* now know the pathname, you do not want to create a new string
* with the pathname, or if the the file no longer has a pathname
* because it has been unlinked.
*
* Because the file is reopened, the file position is reset and
* is not shared with any duplicates of `fd`, unlike a call to
* dup(3). it is visible to the filesystem as a new open file
* descriptor and is distinguished from the duplocates of `fd`,
* and all file locks associated with `fd` are lost, except for
* on the duplicates of `fd`, which means that you can create
* new locks without removing locks from the duplicates of `fd`.
*
* This is a slibc extension.
*
* @etymology (Reopen) file!
*
* @param fd The file descriptor.
* @param oflag How the file shall be opened, see open(3).
* `O_CREAT` is not allowed.
* @return Zero on success, -1 on error.
*
* @throws EINVAL `oflag` contains `O_CREAT`.
* @throws EINVAL `fd` is negative.
* @throws Any error specified for open(3).
* @throws Any error specified for dup2(3).
*
* @since Always.
*/
int reopen(int, int);
#endif
#endif
