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Diffstat (limited to 'libc/sysdeps/linux/x86_64/brk.c')
-rw-r--r--libc/sysdeps/linux/x86_64/brk.c44
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;
+}