1 files changed, 61 insertions, 1 deletions

diff --git a/gnu/usr.bin/ld/rtld/rtld.c b/gnu/usr.bin/ld/rtld/rtld.c
index 0cccd23d12c0..2f9e361fa638 100644
--- a/gnu/usr.bin/ld/rtld/rtld.c
+++ b/gnu/usr.bin/ld/rtld/rtld.c
@@ -27,7 +27,7 @@
  * (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: rtld.c,v 1.3 1993/11/09 04:44:30 paul Exp $
+ *	$Id: rtld.c,v 1.4 1993/11/22 19:05:27 jkh Exp $
  */
 
 #include <machine/vmparam.h>
@@ -240,6 +240,9 @@ struct link_dynamic	*dp;
 		if (link_map_head)
 			ldp->ldd_sym_loaded = 1;
 	}
+
+	/* Close our file descriptor */
+	(void)close(crtp->crt_ldfd);
 }
 
 
@@ -1055,6 +1058,63 @@ xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
 	if (mmap(curbrk, incr,
 			PROT_READ|PROT_WRITE,
 			MAP_ANON|MAP_FIXED|MAP_COPY, fd, 0) == (caddr_t)-1) {
+		xprintf("Cannot map anonymous memory");
+		_exit(1);
+	}
+
+#ifdef NEED_DEV_ZERO
+	close(fd);
+#endif
+
+	oldbrk = curbrk;
+#if TRY_THIS_FOR_A_CHANGE
+	curbrk -= incr;
+#else
+	curbrk += incr;
+#endif
+
+	return oldbrk;
+}
+#else
+
+caddr_t
+sbrk(incr)
+int incr;
+{
+	int	fd = -1;
+	caddr_t	oldbrk;
+
+xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
+#if DEBUG
+xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk);
+#endif
+	if (curbrk == 0 && (curbrk = mmap(0, PAGSIZ,
+			PROT_READ|PROT_WRITE,
+			MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) {
+		xprintf("Cannot map anonymous memory");
+		_exit(1);
+	}
+
+	/* There's valid memory from `curbrk' to next page boundary */
+	if ((long)curbrk + incr <= (((long)curbrk + PAGSIZ) & ~(PAGSIZ - 1))) {
+		oldbrk = curbrk;
+		curbrk += incr;
+		return oldbrk;
+	}
+	/*
+	 * If asking for than currently left in this chunk,
+	 * go somewhere completely different.
+	 */
+
+#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) {
 		perror("Cannot map anonymous memory");
 	}