1 files changed, 182 insertions, 0 deletions

diff --git a/devel/linuxthreads/files/telldir.c b/devel/linuxthreads/files/telldir.c
new file mode 100644
index 000000000000..31f573d5322a
--- /dev/null
+++ b/devel/linuxthreads/files/telldir.c
@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 1983, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: src/lib/libc/gen/telldir.c,v 1.4.12.1 2001/03/05 09:39:59 obrien Exp $
+ */
+
+#if __FreeBSD__ < 5
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)telldir.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/*
+ * The option SINGLEUSE may be defined to say that a telldir
+ * cookie may be used only once before it is freed. This option
+ * is used to avoid having memory usage grow without bound.
+ */
+#define SINGLEUSE
+
+/*
+ * One of these structures is malloced to describe the current directory
+ * position each time telldir is called. It records the current magic
+ * cookie returned by getdirentries and the offset within the buffer
+ * associated with that return value.
+ */
+struct ddloc {
+	struct	ddloc *loc_next;/* next structure in list */
+	long	loc_index;	/* key associated with structure */
+	long	loc_seek;	/* magic cookie returned by getdirentries */
+	long	loc_loc;	/* offset of entry in buffer */
+	const DIR* loc_dirp;	/* directory which used this entry */
+};
+
+#define	NDIRHASH	32	/* Num of hash lists, must be a power of 2 */
+#define	LOCHASH(i)	((i)&(NDIRHASH-1))
+
+static long	dd_loccnt;	/* Index of entry for sequential readdir's */
+static struct	ddloc *dd_hash[NDIRHASH];   /* Hash list heads for ddlocs */
+
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+extern int __isthreaded;
+static pthread_mutex_t  telldir_mutex = PTHREAD_MUTEX_INITIALIZER;
+#define	THREAD_LOCK()	if (__isthreaded) pthread_mutex_lock(&telldir_mutex)
+#define	THREAD_UNLOCK()	if (__isthreaded) pthread_mutex_unlock(&telldir_mutex)
+#else
+#define	THREAD_LOCK()
+#define	THREAD_UNLOCK()
+#endif
+
+/*
+ * return a pointer into a directory
+ */
+long
+telldir(dirp)
+	const DIR *dirp;
+{
+	int index;
+	struct ddloc *lp;
+
+	if ((lp = (struct ddloc *)malloc(sizeof(struct ddloc))) == NULL)
+		return (-1);
+	THREAD_LOCK();
+	index = dd_loccnt++;
+	lp->loc_index = index;
+	lp->loc_seek = dirp->dd_seek;
+	lp->loc_loc = dirp->dd_loc;
+	lp->loc_dirp = dirp;
+	lp->loc_next = dd_hash[LOCHASH(index)];
+	dd_hash[LOCHASH(index)] = lp;
+	THREAD_UNLOCK();
+	return (index);
+}
+
+/*
+ * seek to an entry in a directory.
+ * Only values returned by "telldir" should be passed to seekdir.
+ */
+void
+_seekdir(dirp, loc)
+	DIR *dirp;
+	long loc;
+{
+	struct ddloc *lp;
+	struct ddloc **prevlp;
+	struct dirent *dp;
+
+	THREAD_LOCK();
+	prevlp = &dd_hash[LOCHASH(loc)];
+	lp = *prevlp;
+	while (lp != NULL) {
+		if (lp->loc_index == loc)
+			break;
+		prevlp = &lp->loc_next;
+		lp = lp->loc_next;
+	}
+	if (lp == NULL) {
+	  THREAD_UNLOCK();
+	  return;
+	}
+#ifdef SINGLEUSE
+	*prevlp = lp->loc_next;
+#endif
+	THREAD_UNLOCK();
+	if (lp->loc_loc == dirp->dd_loc && lp->loc_seek == dirp->dd_seek)
+		goto found;
+	(void) lseek(dirp->dd_fd, (off_t)lp->loc_seek, SEEK_SET);
+	dirp->dd_seek = lp->loc_seek;
+	dirp->dd_loc = 0;
+	while (dirp->dd_loc < lp->loc_loc) {
+		dp = readdir(dirp);
+		if (dp == NULL)
+			break;
+	}
+found:
+#ifdef SINGLEUSE
+	free((caddr_t)lp);
+#endif
+}
+
+/*
+ * Reclaim memory for telldir cookies which weren't used.
+ */
+void
+_reclaim_telldir(dirp)
+	const DIR *dirp;
+{
+	struct ddloc *lp;
+	struct ddloc **prevlp;
+	int i;
+
+	THREAD_LOCK();
+	for (i = 0; i < NDIRHASH; i++) {
+		prevlp = &dd_hash[i];
+		lp = *prevlp;
+		while (lp != NULL) {
+			if (lp->loc_dirp == dirp) {
+				*prevlp = lp->loc_next;
+				free((caddr_t)lp);
+				lp = *prevlp;
+				continue;
+			}
+			prevlp = &lp->loc_next;
+			lp = lp->loc_next;
+		}
+	}
+	THREAD_UNLOCK();
+}
+#endif /* __FreeBSD__ < 5 */