Non-blocking garbage collector

The garbage collector no longer blocks other processes from
adding/building store paths or adding GC roots. To prevent the
collector from deleting store paths just added by another process,
processes need to connect to the garbage collector via a Unix domain
socket to register new temporary roots.

1 files changed, 1 insertions, 8 deletions

diff --git a/src/libstore/uds-remote-store.cc b/src/libstore/uds-remote-store.cc
index 02e81b022..5c38323cd 100644
--- a/src/libstore/uds-remote-store.cc
+++ b/src/libstore/uds-remote-store.cc
@@ -56,14 +56,7 @@ ref<RemoteStore::Connection> UDSRemoteStore::openConnection()
     auto conn = make_ref<Connection>();
 
     /* Connect to a daemon that does the privileged work for us. */
-    conn->fd = socket(PF_UNIX, SOCK_STREAM
-        #ifdef SOCK_CLOEXEC
-        | SOCK_CLOEXEC
-        #endif
-        , 0);
-    if (!conn->fd)
-        throw SysError("cannot create Unix domain socket");
-    closeOnExec(conn->fd.get());
+    conn->fd = createUnixDomainSocket();
 
     nix::connect(conn->fd.get(), path ? *path : settings.nixDaemonSocketFile);