implemented fifo command P

core/fifo.c

@@ -30,6 +30,7 @@ void uwsgi_master_fifo_prepare() {
 	uwsgi_fifo_table['l'] = uwsgi_log_reopen;
 	uwsgi_fifo_table['L'] = uwsgi_log_rotate;
 	uwsgi_fifo_table['p'] = suspend_resume_them_all;
+	uwsgi_fifo_table['P'] = uwsgi_update_pidfiles;
 	uwsgi_fifo_table['Q'] = kill_them_all;
 	uwsgi_fifo_table['r'] = grace_them_all;
 	uwsgi_fifo_table['R'] = reap_them_all;

core/uwsgi.c

@@ -4535,3 +4535,12 @@ void uwsgi_print_sym(char *opt, char *symbol, void *foobar) {
 
 	exit(0);
 }
+
+void uwsgi_update_pidfiles() {
+	if (uwsgi.pidfile) {
+		uwsgi_write_pidfile(uwsgi.pidfile);
+	}
+	if (uwsgi.pidfile2) {
+		uwsgi_write_pidfile(uwsgi.pidfile2);
+	}
+}

uwsgi.h

@@ -4325,6 +4325,7 @@ void uwsgi_log_reopen();
 void uwsgi_reload_workers();
 void uwsgi_chain_reload();
 void uwsgi_refork_master();
+void uwsgi_update_pidfiles();
 
 #ifdef __cplusplus
 }