From 6277403422be2b7e5bf17ce5cea4c0da511e9c2d Mon Sep 17 00:00:00 2001
From: "Jordan K. Hubbard" <jkh@FreeBSD.org>
Date: Sat, 11 Dec 1993 21:06:36 +0000
Subject: [PATCH] Added sbrk() as new file.

---
 gnu/usr.bin/ld/rtld/sbrk.c | 101 +++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 gnu/usr.bin/ld/rtld/sbrk.c

diff --git a/gnu/usr.bin/ld/rtld/sbrk.c b/gnu/usr.bin/ld/rtld/sbrk.c
new file mode 100644
index 000000000000..2d2c610dedb9
--- /dev/null
+++ b/gnu/usr.bin/ld/rtld/sbrk.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 1993 Paul Kranenburg
+ * 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 Paul Kranenburg.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ *	$Id$
+ */
+
+#include <machine/vmparam.h>
+#include <sys/param.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/file.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/mman.h>
+#ifndef BSD
+#define MAP_COPY	MAP_PRIVATE
+#define MAP_FILE	0
+#define MAP_ANON	0
+#endif
+#include <fcntl.h>
+#include <a.out.h>
+#include <stab.h>
+#include <string.h>
+#if __STDC__
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+
+#include "ld.h"
+
+#ifndef BSD		/* Need do better than this */
+#define NEED_DEV_ZERO	1
+#endif
+
+caddr_t
+sbrk(incr)
+int incr;
+{
+	int	fd = -1;
+	caddr_t curbrk;
+
+	/* Round-up increment to page size */
+	incr = ((incr + PAGSIZ - 1) & ~(PAGSIZ - 1));
+
+#if DEBUG
+xprintf("sbrk: incr = %#x\n", incr);
+#endif
+
+#ifdef NEED_DEV_ZERO
+	fd = open("/dev/zero", O_RDWR, 0);
+	if (fd == -1)
+		perror("/dev/zero");
+#endif
+
+	if ((curbrk = mmap(0, incr,
+			PROT_READ|PROT_WRITE,
+			MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) {
+		xprintf("Cannot map anonymous memory");
+		_exit(1);
+	}
+
+#ifdef DEBUG
+xprintf("sbrk: curbrk = %#x\n", curbrk);
+#endif
+
+#ifdef NEED_DEV_ZERO
+	close(fd);
+#endif
+
+	return(curbrk);
+}
+