meta: move photon/libc to root

libc/sys/linux/sbrk.c

@@ -0,0 +1,22 @@
+#include "unistd.h"
+#include <stddef.h>
+#include <stdint.h>
+
+void *__curr_brk = NULL;
+
+void *sbrk(intptr_t increment)
+{
+    if (!__curr_brk) {
+        brk(NULL);
+    }
+
+    uintptr_t end = (uintptr_t)__curr_brk + increment;
+    void *start = __curr_brk;
+    int res = brk((void *)end);
+
+    if (res == -1) {
+        return NULL;
+    }
+
+    return start;
+}