1 files changed, 44 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/x86_64/brk.c b/libc/sysdeps/linux/x86_64/brk.c
new file mode 100644
index 000000000..303b5c0de
--- /dev/null
+++ b/libc/sysdeps/linux/x86_64/brk.c
@@ -0,0 +1,44 @@
+/* brk system call for Linux/x86_64.
+   Copyright (C) 1995, 1996, 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 <errno.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+/* This must be initialized data because commons can't have aliases.  */
+void *__curbrk = 0;
+
+int brk (void *addr)
+{
+	void *__unbounded newbrk;
+
+	asm ("syscall\n"
+	     : "=a" (newbrk)
+	     : "0" (__NR_brk), "D" (__ptrvalue (addr))
+	     : "r11","rcx","memory");
+
+	__curbrk = newbrk;
+
+	if (newbrk < addr) {
+		__set_errno (ENOMEM);
+		return -1;
+	}
+
+	return 0;
+}