Add process_get_pid() to the Process subsystem.

This patch adds support for getting the unique process identifier from a
given process_t. This patch implements both support for both the Unix
and Microsoft Windows backend.

See: https://bugs.torproject.org/28179

1 files changed, 10 insertions, 0 deletions

diff --git a/src/lib/process/process_win32.c b/src/lib/process/process_win32.c
index a019e0b4f3..3e97f37801 100644
--- a/src/lib/process/process_win32.c
+++ b/src/lib/process/process_win32.c
@@ -271,6 +271,16 @@ process_win32_exec(process_t *process)
   return PROCESS_STATUS_RUNNING;
 }
 
+/** Returns the unique process identifier for the given <b>process</b>. */
+process_pid_t
+process_win32_get_pid(process_t *process)
+{
+  tor_assert(process);
+
+  process_win32_t *win32_process = process_get_win32_process(process);
+  return (process_pid_t)win32_process->process_information.dwProcessId;
+}
+
 /** Schedule an async write of the data found in <b>buffer</b> for the given
  * process.  This function runs an async write operation of the content of
  * buffer, if we are not already waiting for a pending I/O request. Returns the