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      1 /*	$NetBSD: file.h,v 1.7 2021/12/19 10:39:06 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_FILE_H_
     33 #define _LINUX_FILE_H_
     34 
     35 #include <sys/param.h>
     36 #include <sys/file.h>
     37 #include <sys/filedesc.h>
     38 #include <sys/proc.h>
     39 
     40 struct file;
     41 
     42 struct fd {
     43 	struct file	*file;
     44 	int		fd_number;
     45 };
     46 
     47 static inline struct fd
     48 fdget(int number)
     49 {
     50 	struct fd fd;
     51 
     52 	fd.file = fd_getfile(number);
     53 	fd.fd_number = number;
     54 
     55 	return fd;
     56 }
     57 
     58 static inline void
     59 fdput(struct fd fd)
     60 {
     61 
     62 	fd_putfile(fd.fd_number);
     63 }
     64 
     65 /* fget translates; fput(fp) doesn't because we have fd_putfile(fd).  */
     66 static inline struct file *
     67 fget(int fd)
     68 {
     69 	return fd_getfile(fd);
     70 }
     71 
     72 static inline void
     73 fd_install(int fd, struct file *fp)
     74 {
     75 	fd_affix(curproc, fp, fd);
     76 }
     77 
     78 #endif  /* _LINUX_FILE_H_ */
     79