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-rw-r--r--src/libutil/util.hh10
1 files changed, 6 insertions, 4 deletions
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index cfaaf1486e9e..0e6941e4a8db 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -13,6 +13,8 @@
 #include <limits>
 #include <cstdio>
 #include <map>
+#include <sstream>
+#include <experimental/optional>
 
 #ifndef HAVE_STRUCT_DIRENT_D_TYPE
 #define DT_UNKNOWN 0
@@ -89,7 +91,7 @@ string readFile(int fd);
 string readFile(const Path & path, bool drain = false);
 
 /* Write a string to a file. */
-void writeFile(const Path & path, const string & s);
+void writeFile(const Path & path, const string & s, mode_t mode = 0666);
 
 /* Read a line from a file descriptor. */
 string readLine(int fd);
@@ -201,7 +203,7 @@ public:
     ~Pid();
     void operator =(pid_t pid);
     operator pid_t();
-    int kill(bool quiet = false);
+    int kill();
     int wait();
 
     void setSeparatePG(bool separatePG);
@@ -231,7 +233,8 @@ pid_t startProcess(std::function<void()> fun, const ProcessOptions & options = P
 /* Run a program and return its stdout in a string (i.e., like the
    shell backtick operator). */
 string runProgram(Path program, bool searchPath = false,
-    const Strings & args = Strings(), const string & input = "");
+    const Strings & args = Strings(),
+    const std::experimental::optional<std::string> & input = {});
 
 class ExecError : public Error
 {
@@ -448,5 +451,4 @@ struct ReceiveInterrupts
     { }
 };
 
-
 }