3 files changed, 22 insertions, 1 deletions
diff --git a/src/libutil/args.cc b/src/libutil/args.cc
index ba15ea571..ad7a268fc 100644
--- a/src/libutil/args.cc
+++ b/src/libutil/args.cc
@@ -178,6 +178,19 @@ Strings argvToStrings(int argc, char * * argv)
     return args;
 }
 
+Strings editorFor(Pos pos)
+{
+    auto editor = getEnv("EDITOR", "cat");
+    auto args = tokenizeString<Strings>(editor);
+    if (pos.line > 0 && (
+        editor.find("emacs") != std::string::npos ||
+        editor.find("nano") != std::string::npos ||
+        editor.find("vim") != std::string::npos))
+        args.push_back(fmt("+%d", pos.line));
+    args.push_back(pos.file);
+    return args;
+}
+
 std::string renderLabels(const Strings & labels)
 {
     std::string res;
diff --git a/src/libutil/args.hh b/src/libutil/args.hh
index b960a55a8..59d427ee6 100644
--- a/src/libutil/args.hh
+++ b/src/libutil/args.hh
@@ -5,6 +5,7 @@
 #include <memory>
 
 #include "util.hh"
+#include "nixexpr.hh"
 
 namespace nix {
 
@@ -241,6 +242,9 @@ public:
 
 Strings argvToStrings(int argc, char * * argv);
 
+/* Helper function to generate args that invoke $EDITOR on filename:lineno */
+Strings editorFor(Pos pos);
+
 /* Helper function for rendering argument labels. */
 std::string renderLabels(const Strings & labels);
 
diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 747b31cff..0902c3783 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -1572,7 +1572,11 @@ std::unique_ptr<InterruptCallback> createInterruptCallback(std::function<void()>
 
 AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode)
 {
-    AutoCloseFD fdSocket = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
+    AutoCloseFD fdSocket = socket(PF_UNIX, SOCK_STREAM
+        #ifdef SOCK_CLOEXEC
+        | SOCK_CLOEXEC
+        #endif
+        , 0);
     if (!fdSocket)
         throw SysError("cannot create Unix domain socket");