1 files changed, 41 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/brk.c b/newlib/libc/sys/linux/brk.c
new file mode 100644
index 000000000..f61a0c3c0
--- /dev/null
+++ b/newlib/libc/sys/linux/brk.c
@@ -0,0 +1,41 @@
+/* libc/sys/linux/brk.c - Change data segment size */
+
+/* Written 2000 by Werner Almesberger */
+
+
+#include <stddef.h> /* for NULL */
+#include <sys/types.h>
+#include <sys/unistd.h>
+#include <sys/syscall.h>
+
+
+static char *curr_brk = NULL;
+
+
+#define __NR___brk __NR_brk /* Linux brk ain't no brk(2) */
+
+static _syscall1(void *,__brk,void *,end_data_segment)
+
+
+int brk(void *end_data_segment)
+{
+     char *new_brk;
+
+     new_brk = __brk(end_data_segment);
+     if (new_brk != end_data_segment) return -1;
+     curr_brk = new_brk;
+     return 0;
+}
+
+
+void *sbrk(size_t increment) /* SHOULD be ptrdiff_t */
+{
+    char *old_brk,*new_brk;
+
+    if (!curr_brk) curr_brk = __brk(NULL);
+    new_brk = __brk(curr_brk+increment);
+    if (new_brk != curr_brk+increment) return (void *) -1;
+    old_brk = curr_brk;
+    curr_brk = new_brk;
+    return old_brk;
+}