patch 8.2.3041: detecting if the process of a swap file is running fails

Problem:    Detecting if the process of a swap file is running fails if the
            process is owned by another user.
Solution:   Check for the ESRCH error. (closes #8436)

src/os_unix.c

@@ -2486,8 +2486,17 @@ mch_get_pid(void)
     int
 mch_process_running(long pid)
 {
-    // EMX kill() not working correctly, it seems
+    // If there is no error the process must be running.
-    return kill(pid, 0) == 0;
+    if (kill(pid, 0) == 0)
+	return TRUE;
+#ifdef ESRCH
+    // If the error is ESRCH then the process is not running.
+    if (errno == ESRCH)
+	return FALSE;
+#endif
+    // If the process is running and owned by another user we get EPERM.  With
+    // other errors the process might be running, assuming it is then.
+    return TRUE;
 }
 
 #if !defined(HAVE_STRERROR) && defined(USE_GETCWD)

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3041,
 /**/
     3040,
 /**/