Add process::id(), make few minor fixes

4 files changed, 24 insertions, 2 deletions

diff --git a/butl/process b/butl/process
index 6f22718..c138edc 100644
--- a/butl/process
+++ b/butl/process
@@ -347,6 +347,9 @@ namespace butl
     print (std::ostream&, const char* const args[], size_t n = 0);
 
   public:
+    id_type
+    id () const;
+
     static id_type
     current_id ();
 
diff --git a/butl/process-run.txx b/butl/process-run.txx
index 013be4c..8368890 100644
--- a/butl/process-run.txx
+++ b/butl/process-run.txx
@@ -20,7 +20,7 @@ namespace butl
   inline int
   process_stderr (const auto_fd& v) {assert (v.get () >= 0); return v.get ();}
 
-  process
+  LIBBUTL_EXPORT process
   process_start (const dir_path& cwd,
                  const process_path& pp,
                  const char* cmd[],
@@ -55,7 +55,7 @@ namespace butl
     //
     const std::size_t args_size (sizeof... (args));
 
-    std::string storage[args_size];
+    std::string storage[args_size != 0 ? args_size : 1];
     const char* cmd[args_size + 2] = {
       pp.recall_string (),
       process_arg_as (args, storage[index])...,
diff --git a/butl/process.cxx b/butl/process.cxx
index 74892e6..05c06f1 100644
--- a/butl/process.cxx
+++ b/butl/process.cxx
@@ -1121,6 +1121,17 @@ namespace butl
   }
 
   process::id_type process::
+  id () const
+  {
+    id_type r (GetProcessId (handle));
+
+    if (r == 0)
+      throw process_error (last_error_msg ());
+
+    return r;
+  }
+
+  process::id_type process::
   current_id ()
   {
     return GetCurrentProcessId ();
diff --git a/butl/process.ixx b/butl/process.ixx
index c452b0f..65aeeb6 100644
--- a/butl/process.ixx
+++ b/butl/process.ixx
@@ -49,6 +49,14 @@ namespace butl
     return *this;
   }
 
+#ifndef _WIN32
+  inline process::id_type process::
+  id () const
+  {
+    return handle;
+  }
+#endif
+
   inline const char* process_path::
   recall_string () const
   {