ad4dda469f
This patch contains changes to NetBSD libc code base to make it compile and work on Minix. Some of them are due to actual NetBSD libc bugs, as we're compiling it in non-reentrant mode and with a.out support, something not exactly frequent in NetBSD. Others are proper fixes to port it to Minix (mostly sa_len parameter missing in socket and a few mmap from files).
128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/* $NetBSD: telldir.c,v 1.19 2008/05/04 18:53:26 tonnerre Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)telldir.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: telldir.c,v 1.19 2008/05/04 18:53:26 tonnerre Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include "reentrant.h"
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#ifdef __minix
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#include <sys/types.h>
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#endif
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#include "extern.h"
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#include <sys/param.h>
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#include <assert.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "dirent_private.h"
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#ifdef __weak_alias
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__weak_alias(telldir,_telldir)
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#endif
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long
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telldir(DIR *dirp)
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{
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long rv;
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#ifdef _REENTRANT
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if (__isthreaded) {
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mutex_lock((mutex_t *)dirp->dd_lock);
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rv = (intptr_t)_telldir_unlocked(dirp);
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mutex_unlock((mutex_t *)dirp->dd_lock);
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} else
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#endif
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rv = (intptr_t)_telldir_unlocked(dirp);
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return rv;
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}
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/*
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* return a pointer into a directory
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*/
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long
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_telldir_unlocked(DIR *dirp)
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{
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struct dirpos *lp;
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for (lp = dirp->dd_internal; lp; lp = lp->dp_next)
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if (lp->dp_seek == dirp->dd_seek &&
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lp->dp_loc == dirp->dd_loc)
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return (intptr_t)lp;
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if ((lp = malloc(sizeof(*lp))) == NULL)
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return (-1);
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lp->dp_seek = dirp->dd_seek;
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lp->dp_loc = dirp->dd_loc;
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lp->dp_next = dirp->dd_internal;
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dirp->dd_internal = lp;
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return (intptr_t)lp;
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}
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/*
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* seek to an entry in a directory.
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* Only values returned by "telldir" should be passed to seekdir.
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*/
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void
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_seekdir_unlocked(DIR *dirp, long loc)
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{
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struct dirpos *lp;
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_DIAGASSERT(dirp != NULL);
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for (lp = dirp->dd_internal; lp; lp = lp->dp_next)
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if ((intptr_t)lp == loc)
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break;
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if (lp == NULL)
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return;
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if (lp->dp_loc == dirp->dd_loc && lp->dp_seek == dirp->dd_seek)
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return;
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dirp->dd_seek = lseek(dirp->dd_fd, lp->dp_seek, SEEK_SET);
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dirp->dd_loc = 0;
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while (dirp->dd_loc < lp->dp_loc)
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if (_readdir_unlocked(dirp, 0) == NULL)
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break;
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}
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