BUG/MINOR: startup: close pidfd and free global.pidfile in handle_pid…

…file()

After master-worker mode refactoring, global.pidfile is only used in
handle_pidfile(), which opens the provided file and writes the PID into it. So,
it's more appropriate to perform the close(pidfd) and ha_free(&global.pidfile)
also in this function.

This commit prepares the fix of the pidfile creation, as it's created now very
early, when we are not sure, that process has successfully started. In
master-worker mode handle_pidfile() can be called in the master process context.
So, let's make it accessible from other compilation units via global.h.

This should be backported only in 3.1.

include/haproxy/global.h

@@ -68,6 +68,7 @@ void hap_register_feature(const char *name);
 int split_version(const char *version, unsigned int *value);
 int compare_current_version(const char *version);
 void display_version();
+void handle_pidfile(void);
 
 void mworker_accept_wrapper(int fd);
 

src/haproxy.c

@@ -1777,7 +1777,7 @@ static void apply_daemon_mode()
 }
 
 /* Only returns if everything is OK. If something fails, it exits. */
-static void handle_pidfile()
+void handle_pidfile(void)
 {
 	char pidstr[100];
 
@@ -1792,6 +1792,9 @@ static void handle_pidfile()
 	}
 	snprintf(pidstr, sizeof(pidstr), "%d\n", (int)getpid());
 	DISGUISE(write(pidfd, pidstr, strlen(pidstr)));
+	close(pidfd);
+	/* We won't ever use this anymore */
+	ha_free(&global.pidfile);
 }
 
 static void get_listeners_fd()
@@ -2568,14 +2571,6 @@ static void step_init_4(void)
 	clock_update_date(0, 1);
 	clock_adjust_now_offset();
 	ready_date = date;
-
-	/* close the pidfile both in children and father */
-	if (pidfd >= 0) {
-		//lseek(pidfd, 0, SEEK_SET);  /* debug: emulate eglibc bug */
-		close(pidfd);
-	}
-	/* We won't ever use this anymore */
-	ha_free(&global.pidfile);
 }
 
 /* This function sets verbosity modes. Should be called after the first