1 files changed, 20 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/lib/sbrk.c b/mdk-stage1/dietlibc/lib/sbrk.c
new file mode 100644
index 000000000..945ad5a16
--- /dev/null
+++ b/mdk-stage1/dietlibc/lib/sbrk.c
@@ -0,0 +1,20 @@
+#include <unistd.h>
+
+extern int __brk(void *end_data_segment);
+
+extern void* __curbrk;
+
+void* __sbrk(ptrdiff_t increment) {
+  void* oldbrk;
+  if (__curbrk==0)
+    if (__brk(0) < 0)
+      return (void*)-1;
+  if (increment==0)
+    return __curbrk;
+  oldbrk=__curbrk;
+  if (__brk(oldbrk+increment)<0)
+    return (void*)-1;
+  return oldbrk;
+}
+
+void* sbrk (ptrdiff_t increment) __attribute__((weak,alias("__sbrk")));