projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 8a90c30e | 1 | /*- |
| 80409bdc KB |
2 | * Copyright (c) 1993 |
| 3 | * The Regents of the University of California. All rights reserved. | |
| 8a90c30e KM |
4 | * |
| 5 | * This code is derived from software contributed to Berkeley by | |
| 6 | * The Mach Operating System project at Carnegie-Mellon University. | |
| 7 | * | |
| 8 | * %sccs.include.redist.c% | |
| 9 | * | |
| 80409bdc | 10 | * @(#)lseek.c 8.1 (Berkeley) %G% |
| 8a90c30e KM |
11 | * |
| 12 | * | |
| 13 | * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University | |
| 14 | * All Rights Reserved. | |
| 15 | * | |
| 16 | * Author: Alessandro Forin | |
| 17 | * | |
| 18 | * Permission to use, copy, modify and distribute this software and its | |
| 19 | * documentation is hereby granted, provided that both the copyright | |
| 20 | * notice and this permission notice appear in all copies of the | |
| 21 | * software, derivative works or modified versions, and any portions | |
| 22 | * thereof, and that both notices appear in supporting documentation. | |
| 23 | * | |
| 24 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" | |
| 25 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR | |
| 26 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. | |
| 27 | * | |
| 28 | * Carnegie Mellon requests users of this software to return to | |
| 29 | * | |
| 30 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU | |
| 31 | * School of Computer Science | |
| 32 | * Carnegie Mellon University | |
| 33 | * Pittsburgh PA 15213-3890 | |
| 34 | * | |
| 35 | * any improvements or extensions that they make and grant Carnegie the | |
| 36 | * rights to redistribute these changes. | |
| 37 | */ | |
| 38 | ||
| 39 | #include <stand/stand.h> | |
| 40 | ||
| 41 | off_t | |
| 42 | lseek(fd, offset, where) | |
| 43 | int fd; | |
| 44 | off_t offset; | |
| 45 | int where; | |
| 46 | { | |
| 47 | register struct open_file *f = &files[fd]; | |
| 48 | ||
| 49 | if ((unsigned)fd >= SOPEN_MAX || f->f_flags == 0) { | |
| 50 | errno = EBADF; | |
| 51 | return (-1); | |
| 52 | } | |
| 53 | ||
| 54 | /* seek is not supported on raw devices */ | |
| 55 | if (f->f_flags & F_RAW) | |
| 56 | return ((off_t)-1); | |
| 57 | ||
| 58 | return (f->f_ops->seek)(f, offset, where); | |
| 59 | } |