nix-store --serve: Monitor for client disconnects

This is necessary because build-remote.pl now builds via ‘nix-store
--serve’. So if a build hangs without writing to stdout/stderr, and
the client disconnects, then we need to detect that.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/nix-store/nix-store.cc b/src/nix-store/nix-store.cc
index 048f5c603008..25a955e09363 100644
--- a/src/nix-store/nix-store.cc
+++ b/src/nix-store/nix-store.cc
@@ -8,6 +8,7 @@
 #include "util.hh"
 #include "serve-protocol.hh"
 #include "worker-protocol.hh"
+#include "monitor-fd.hh"
 
 #include <iostream>
 #include <algorithm>
@@ -879,6 +880,8 @@ static void opServe(Strings opFlags, Strings opArgs)
     FdSource in(STDIN_FILENO);
     FdSink out(STDOUT_FILENO);
 
+    MonitorFdHup monitor(in.fd);
+
     /* Exchange the greeting. */
     unsigned int magic = readInt(in);
     if (magic != SERVE_MAGIC_1) throw Error("protocol mismatch");