1 files changed, 25 insertions, 0 deletions
diff --git a/system/__sbrk.c b/system/__sbrk.c
new file mode 100644
index 0000000..df2a302
--- /dev/null
+++ b/system/__sbrk.c
@@ -0,0 +1,25 @@
+#include <sys/types.h>
+#define N	((void *)-1)
+
+extern void *SYS_brk(void *x);
+static void *cur = N;
+
+void *sbrk(ssize_t incr) {
+  void *t=0, *old=N;
+
+  if (cur == N) {
+  again:
+    cur = SYS_brk(t);
+    if (cur == N) return cur;
+  }
+
+  if (old == N) {
+    old = cur;
+    if (incr) {
+      t = old + incr;
+      goto again;
+    }
+  }
+
+  return old;
+}