* Refactorings.

src/exec.hh

@@ -0,0 +1,18 @@
+#ifndef __EXEC_H
+#define __EXEC_H
+
+#include <string>
+#include <map>
+
+using namespace std;
+
+
+/* A Unix environment is a mapping from strings to strings. */
+typedef map<string, string> Environment;
+
+
+/* Run a program. */
+void runProgram(const string & program, Environment env);
+
+
+#endif /* !__EXEC_H */