MINOR: startup: replace HAPROXY_LOAD_SUCCESS with global load_status

After master-worker refactoring, master performs re-exec only once up to
receiving "reload" command or USR2 signal. There is no more the second
master's re-exec to free unused memory. Thus, there is no longer need to export
environment variable HAPROXY_LOAD_SUCCESS with worker process load status. This
status can be simply saved in a global variable load_status.

Author: einval22

include/haproxy/mworker.h

@@ -18,6 +18,7 @@
 #include <haproxy/signal-t.h>
 
 extern int max_reloads;
+extern int load_status;
 extern struct mworker_proc *proc_self;
 /* master CLI configuration (-S flag) */
 extern struct list mworker_cli_conf;

src/cli.c

@@ -2532,7 +2532,7 @@ static int _send_status(char **args, char *payload, struct appctx *appctx, void
 			kill(proc->pid, oldpids_sig);
 		}
 	}
-	setenv("HAPROXY_LOAD_SUCCESS", "1", 1);
+	load_status = 1;
 	ha_notice("Loading success.\n");
 
 #if defined(USE_SYSTEMD)

src/haproxy.c

@@ -936,7 +936,7 @@ void on_new_child_failure()
 	sock_drop_unused_old_sockets();
 
 	usermsgs_clr(NULL);
-	setenv("HAPROXY_LOAD_SUCCESS", "0", 1);
+	load_status = 0;
 	ha_warning("Failed to load worker!\n");
 #if defined(USE_SYSTEMD)
 	/* the sd_notify API is not able to send a reload failure signal. So
@@ -3048,10 +3048,10 @@ static void run_master_in_recovery_mode(int argc, char **argv)
 	struct mworker_proc *proc;
 	char *errmsg = NULL;
 
-	/* HAPROXY_LOAD_SUCCESS is checked in cli_io_handler_show_cli_sock() to
+	/* load_status is global and checked in cli_io_handler_show_cli_sock() to
 	 * dump master startup logs with its alerts/warnings via master CLI sock.
 	 */
-	setenv("HAPROXY_LOAD_SUCCESS", "0", 1);
+	load_status = 0;
 
 	/* increment the number failed reloads */
 	list_for_each_entry(proc, &proc_list, list) {

src/mworker.c

@@ -47,6 +47,7 @@
 
 static int exitcode = -1;
 int max_reloads = INT_MAX; /* max number of reloads a worker can have until they are killed */
+int load_status; /* worker process startup status: 1 - loaded successfully; 0 - load failed */
 struct mworker_proc *proc_self = NULL; /* process structure of current process */
 struct list mworker_cli_conf = LIST_HEAD_INIT(mworker_cli_conf); /* master CLI configuration (-S flag) */
 
@@ -795,7 +796,6 @@ static int cli_parse_reload(char **args, char *payload, struct appctx *appctx, v
 static int cli_io_handler_show_loadstatus(struct appctx *appctx)
 {
 	struct mworker_proc *proc;
-	char *env;
 
 	if (!cli_has_level(appctx, ACCESS_LVL_OPER))
 		return 1;
@@ -810,15 +810,11 @@ static int cli_io_handler_show_loadstatus(struct appctx *appctx)
 		}
 	}
 
-	env = getenv("HAPROXY_LOAD_SUCCESS");
-	if (!env)
-		return 1;
-
-	if (strcmp(env, "0") == 0) {
+	if (load_status == 0)
 		chunk_printf(&trash, "Success=0\n");
-	} else if (strcmp(env, "1") == 0) {
+	else
 		chunk_printf(&trash, "Success=1\n");
-	}
+
 #ifdef USE_SHM_OPEN
 	if (startup_logs && ring_data(startup_logs) > 1)
 		chunk_appendf(&trash, "--\n");