1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Copyright (c) 2000 8 * Daniel Eischen. All rights reserved. 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 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $FreeBSD$ 35 */ 36 37 #ifndef _TELLDIR_H_ 38 #define _TELLDIR_H_ 39 40 #include <sys/queue.h> 41 #include <stdbool.h> 42 43 /* 44 * One of these structures is malloced to describe the current directory 45 * position each time telldir is called. It records the current magic 46 * cookie returned by getdirentries and the offset within the buffer 47 * associated with that return value. 48 */ 49 struct ddloc { 50 LIST_ENTRY(ddloc) loc_lqe; /* entry in list */ 51 long loc_index; /* key associated with structure */ 52 off_t loc_seek; /* magic cookie returned by getdirentries */ 53 long loc_loc; /* offset of entry in buffer */ 54 }; 55 56 /* 57 * One of these structures is malloced for each DIR to record telldir 58 * positions. 59 */ 60 struct _telldir { 61 LIST_HEAD(, ddloc) td_locq; /* list of locations */ 62 long td_loccnt; /* index of entry for sequential readdir's */ 63 }; 64 65 bool _filldir(DIR *, bool); 66 struct dirent *_readdir_unlocked(DIR *, int); 67 void _reclaim_telldir(DIR *); 68 void _seekdir(DIR *, long); 69 void _fixtelldir(DIR *dirp, long oldseek, long oldloc); 70 71 #define RDU_SKIP 0x0001 72 #define RDU_SHORT 0x0002 73 74 #endif 75