1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Copyright (c) 2000 6 * Daniel Eischen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 35 #ifndef _TELLDIR_H_ 36 #define _TELLDIR_H_ 37 38 #include <sys/queue.h> 39 #include <stdbool.h> 40 41 /* 42 * One of these structures is malloced to describe the current directory 43 * position each time telldir is called. It records the current magic 44 * cookie returned by getdirentries and the offset within the buffer 45 * associated with that return value. 46 */ 47 struct ddloc { 48 LIST_ENTRY(ddloc) loc_lqe; /* entry in list */ 49 long loc_index; /* key associated with structure */ 50 off_t loc_seek; /* magic cookie returned by getdirentries */ 51 long loc_loc; /* offset of entry in buffer */ 52 }; 53 54 /* 55 * One of these structures is malloced for each DIR to record telldir 56 * positions. 57 */ 58 struct _telldir { 59 LIST_HEAD(, ddloc) td_locq; /* list of locations */ 60 long td_loccnt; /* index of entry for sequential readdir's */ 61 }; 62 63 bool _filldir(DIR *, bool); 64 struct dirent *_readdir_unlocked(DIR *, int); 65 void _reclaim_telldir(DIR *); 66 void _seekdir(DIR *, long); 67 void _fixtelldir(DIR *dirp, long oldseek, long oldloc); 68 69 #define RDU_SKIP 0x0001 70 #define RDU_SHORT 0x0002 71 72 #endif 73