add function to read task audit session id

Author: thisptr-hub

include/pfs/task.hpp

@@ -96,6 +96,8 @@ class task final
     std::vector<id_map> get_uid_map() const;
     std::vector<id_map> get_gid_map() const;
 
+    uint32_t get_sessionid() const;
+
 private:
     friend class procfs;
     task(const std::string& procfs_root, int id);

src/task.cpp

@@ -33,6 +33,7 @@
 #include "pfs/parsers/mountinfo.hpp"
 #include "pfs/parsers/lines.hpp"
 #include "pfs/parsers/common.hpp"
+#include "pfs/parsers/number.hpp"
 #include "pfs/parsers/task_io.hpp"
 #include "pfs/parsers/task_status.hpp"
 #include "pfs/task.hpp"
@@ -489,4 +490,15 @@ std::vector<id_map> task::get_gid_map() const
     return output;
 }
 
+uint32_t task::get_sessionid() const
+{
+    static const std::string SESSION_ID_FILE("sessionid");
+    auto path = _task_root + SESSION_ID_FILE;
+
+    auto line = utils::readline(path);
+    uint32_t session_id;
+    parsers::to_number(line, session_id);
+    return session_id;
+}
+
 } // namespace pfs