pkgs/sandbox: Implement a path cache

First of all this is to bring down the amount of syscalls we're doing
but it's also useful to avoid errors when we try to mount a path over an
already mounted path.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/pkgs/games/build-support/build-sandbox/src/path-cache.cc b/pkgs/games/build-support/build-sandbox/src/path-cache.cc
new file mode 100644
index 00000000..5bfa43a7
--- /dev/null
+++ b/pkgs/games/build-support/build-sandbox/src/path-cache.cc
@@ -0,0 +1,21 @@
+#include <set>
+#include <string>
+
+typedef std::set<std::string> *path_cache;
+
+extern "C" {
+    path_cache new_path_cache(void)
+    {
+        return new std::set<std::string>();
+    }
+
+    void free_path_cache(path_cache pc)
+    {
+        delete pc;
+    }
+
+    bool cache_path(path_cache pc, const char *path)
+    {
+        return pc->insert(std::string(path)).second;
+    }
+}