optimize acl_master for managing more no-acl modules

Author: zhengshuxin

app/master/daemon/master/master.h

@@ -30,6 +30,7 @@ typedef struct ACL_MASTER_SERV {
 	int      flags;			/* status, features, etc. */
 	char    *name;			/* service endpoint name */
 	char    *owner;			/* service running privilege if not null*/
+	char    *home;			/* service working home default */
 	long     start;			/* service start running time */
 	int      type;			/* UNIX-domain, INET, etc. */
 	int      wakeup_time;		/* wakeup interval */

app/master/daemon/master/master_ent.cpp

@@ -629,6 +629,13 @@ static int service_args(ACL_XINETD_CFG_PARSER *xcp, ACL_MASTER_SERV *serv,
 		serv->owner = NULL;
 	}
 
+	ptr_const = get_str_ent(xcp, ACL_VAR_MASTER_SERV_HOME, "");
+	if (ptr_const && *ptr_const) {
+		serv->home = acl_mystrdup(ptr_const);
+	} else {
+		serv->home = NULL;
+	}
+
 	/* Path to command */
 	command = get_str_ent(xcp, ACL_VAR_MASTER_SERV_COMMAND, "");
 	if (command == NULL || *command == 0) {
@@ -946,8 +953,9 @@ void acl_master_ent_print(ACL_MASTER_SERV *serv)
 	acl_msg_info("max_proc: %d", serv->max_proc);
 	acl_msg_info("prefork_proc: %d", serv->prefork_proc);
 	acl_msg_info("path: %s", serv->path);
-	for (cpp = serv->args->argv; *cpp; cpp++)
+	for (cpp = serv->args->argv; *cpp; cpp++) {
 		acl_msg_info("arg[%d]: %s", (int) (cpp - serv->args->argv), *cpp);
+	}
 	acl_msg_info("prefork_proc: %d", serv->prefork_proc);
 	acl_msg_info("avail_proc: %d", serv->avail_proc);
 	acl_msg_info("total_proc: %d", serv->total_proc);
@@ -1002,6 +1010,9 @@ void acl_master_ent_free(ACL_MASTER_SERV *serv)
 	if (serv->owner) {
 		acl_myfree(serv->owner);
 	}
+	if (serv->home) {
+		acl_myfree(serv->home);
+	}
 	if (serv->notify_addr) {
 		acl_myfree(serv->notify_addr);
 	}

app/master/daemon/master/master_params.h

@@ -135,6 +135,7 @@ extern int   acl_var_master_start_timeo;
 #define ACL_VAR_MASTER_SERV_CMDEXT		"master_cmdext"
 #define	ACL_VAR_MASTER_SERV_ARGS		"master_args"
 #define	ACL_VAR_MASTER_SERV_OWNER		"master_owner"
+#define	ACL_VAR_MASTER_SERV_HOME		"master_home"
 #define	ACL_VAR_MASTER_SERV_ENV			"master_env"
 #define	ACL_VAR_MASTER_NOTIFY_ADDR		"master_notify_addr"
 #define	ACL_VAR_MASTER_NOTIFY_RECIPIENTS	"master_notify_recipients"

app/master/daemon/master/master_spawn.cpp

@@ -189,13 +189,25 @@ static void start_child(ACL_MASTER_SERV *serv)
 		acl_msg_info("%s: cmd = %s", myname, serv->path);
 	}
 
+	/* Help app to change working directory */
+	if (serv->home && *serv->home) {
+		if (chdir(serv->home) == -1) {
+			acl_msg_error("%s: chdir to %s error %s",
+				myname, serv->home, acl_last_serror());
+		} else {
+			acl_msg_info("%s: %s chdir to %s ok",
+				myname, serv->path, serv->home);
+		}
+	}
+
 	/* Help programs written by golang to change runing privilege */
 	if (serv->owner && *serv->owner) {
 		acl_msg_info("%s: acl_chroot_uid %s", myname, serv->owner);
 		acl_chroot_uid(NULL, serv->owner);
 	}
 
 	log_argv(serv->path, serv->args);
+
 	execvp(serv->path, serv->args->argv);
 	acl_msg_fatal("%s: exec %s: %s", myname, serv->path, strerror(errno));
 }