Make sbrk common, add arm/brk.c, cleanup leftover damage

1 files changed, 47 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/common/sbrk.c b/libc/sysdeps/linux/common/sbrk.c
new file mode 100644
index 000000000..028370e99
--- /dev/null
+++ b/libc/sysdeps/linux/common/sbrk.c
@@ -0,0 +1,47 @@
+/* Copyright (C) 1991, 1995, 1996, 1997, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <unistd.h>
+#include <errno.h>
+
+/* Defined in brk.c.  */
+extern void *__curbrk;
+extern int brk (void *addr);
+
+
+/* Extend the process's data space by INCREMENT.
+   If INCREMENT is negative, shrink data space by - INCREMENT.
+   Return start of new space allocated, or -1 for errors.  */
+void * sbrk (intptr_t increment)
+{
+    void *oldbrk;
+
+    if (__curbrk == NULL)
+	if (brk (0) < 0)		/* Initialize the break.  */
+	    return (void *) -1;
+
+    if (increment == 0)
+	return __curbrk;
+
+    oldbrk = __curbrk;
+    if (brk (oldbrk + increment) < 0)
+	return (void *) -1;
+
+    return oldbrk;
+}
+