gen/FreeBSD/telldir.h

   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: src/lib/libc/gen/telldir.h,v 1.3 2008/05/05 14:05:23 kib Exp $
  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 #if __DARWIN_64_BIT_INO_T
  51         __darwin_off_t  loc_seek;       /* returned by lseek */
  52 #else /* !__DARWIN_64_BIT_INO_T */
  53         long    loc_seek;       /* magic cookie returned by getdirentries */
  54 #endif /* __DARWIN_64_BIT_INO_T */
  55         long    loc_loc;        /* offset of entry in buffer */
  56 };
  57
  58 /*
  59  * One of these structures is malloced for each DIR to record telldir
  60  * positions.
  61  */
  62 struct _telldir {
  63         LIST_HEAD(, ddloc) td_locq; /* list of locations */
  64         long    td_loccnt;      /* index of entry for sequential readdir's */
  65 #if __DARWIN_64_BIT_INO_T
  66         __darwin_off_t seekoff; /* 64-bit seek offset */
  67 #endif /* __DARWIN_64_BIT_INO_T */
  68 };
  69
  70 /*
  71  * This lets paths like `/` or top-level bundles to return in a single
  72  * __getdirentries64 while keeping pressure on malloc small.
  73  */
  74 #define READDIR_INITIAL_SIZE  2048
  75 #define READDIR_LARGE_SIZE    (8 << 10)
  76
  77 #if __DARWIN_64_BIT_INO_T
  78 size_t          __getdirentries64(int fd, void *buf, size_t bufsize, __darwin_off_t *basep);
  79 #endif /* __DARWIN_64_BIT_INO_T */
  80 __attribute__ ((visibility ("hidden")))
  81 bool           _filldir(DIR *, bool) __DARWIN_INODE64(_filldir);
  82 struct dirent   *_readdir_unlocked(DIR *, int) __DARWIN_INODE64(_readdir_unlocked);
  83 void            _reclaim_telldir(DIR *);
  84 void            _seekdir(DIR *, long) __DARWIN_ALIAS_I(_seekdir);
  85 __attribute__ ((visibility ("hidden")))
  86 void        _fixtelldir(DIR *dirp, long oldseek, long oldloc) __DARWIN_INODE64(_fixtelldir);
  87 long            telldir(DIR *) __DARWIN_ALIAS_I(telldir);
  88
  89 #endif