Add process.h: is_running()

1 files changed, 27 insertions, 0 deletions

diff --git a/process.cpp b/process.cpp
new file mode 100644
index 0000000..b30ef3d
--- /dev/null
+++ b/process.cpp
@@ -0,0 +1,27 @@
+#include "process.h"
+
+#include <filesystem>
+#include <string>
+
+#include "file.h"
+
+namespace fs = std::filesystem;
+
+bool Reichwein::Process::is_running(pid_t pid)
+{
+  fs::path pid_file{"/proc/" + std::to_string(pid) + "/stat"};
+  if (!fs::exists(pid_file))
+   return false;
+
+  std::string s{Reichwein::File::getFile(pid_file)};
+
+  auto pos0{s.find(' ', 0)};
+  pos0 = s.find(' ', pos0 + 1);
+  pos0++;
+
+  auto pos1{s.find(' ', pos0 + 1)};
+
+  std::string state{s.substr(pos0, pos1 - pos0)};
+
+  return state == "R" || state == "S";
+}