diff --git a/trunk/configure.in b/trunk/configure.in
index 2e87410..09df792 100644
--- a/trunk/configure.in
+++ b/trunk/configure.in
@@ -856,7 +856,6 @@ SJ3VARDIR="$sj3var_dir"
 AC_SUBST(SJ3VARDIR)
 AC_DEFINE_UNQUOTED(CHROOTDIR, "$sj3var_dir/spool/sj3", [chrooted dir])
 AC_DEFINE_UNQUOTED(SOCKETNAME, "$sj3var_dir/run/sj3serv.socket", [socket file])
-AC_DEFINE_UNQUOTED(PIDFILE, "$sj3var_dir/run/sj3serv.pid", [pid file])
 
 SJ3DICTDIR="$sj3var_dir/spool/sj3"
 AC_SUBST(SJ3DICTDIR)
diff --git a/trunk/src/sj3serv/main.c b/trunk/src/sj3serv/main.c
index f186c2f..9e0572a 100644
--- a/trunk/src/sj3serv/main.c
+++ b/trunk/src/sj3serv/main.c
@@ -59,40 +59,6 @@ opening()
 	printf("Build at %s\r\n", time_stamp);
 }
 
-int
-make_pidfile()
-{
-	int fd;
-	char buf[BUFSIZ];
-	size_t len;
-
-	fd = open(pid_file, O_CREAT | O_WRONLY | O_EXCL, 0600);
-	if (fd < 0) {
-		fprintf(stderr, "can't create file '%s'\n", pid_file);
-		return ERROR;
-	}
-
-	snprintf(buf, sizeof(buf), "%d", getpid());
-	len = strlen(buf);
-	if (write(fd, buf, strlen(buf)) != len) {
-		fprintf(stderr, "can't write file '%s'\n", pid_file);
-		close(fd);
-		return ERROR;
-	}
-
-	close(fd);
-
-	if (!chroot_enable)
-		return 0;
-
-	return 0;
-}
-int
-erase_pidfile()
-{
-	return unlink(pid_file);
-}
-
 static int
 signal_handler(int sig)
 {
@@ -129,8 +95,6 @@ server_terminate()
 	sj_closeall();
 	exit_auth();
 
-	erase_pidfile();
-
 	exit(0);
 }
 
@@ -183,13 +147,6 @@ main(int argc, char **argv)
 	preload_dict();
 	preopen_dict();
 
-	if (make_pidfile() == ERROR) {
-		fprintf(stderr, "already running...\n");
-		fflush(stderr);
-		exit_auth();
-		exit(1);
-	}
-
 	communicate();
 
 	close_socket();
@@ -197,7 +154,5 @@ main(int argc, char **argv)
 	sj_closeall();
 	exit_auth();
 
-	erase_pidfile();
-
 	exit(0);
 }
diff --git a/trunk/src/sj3serv/setup.c b/trunk/src/sj3serv/setup.c
index 5264f42..a46fb34 100644
--- a/trunk/src/sj3serv/setup.c
+++ b/trunk/src/sj3serv/setup.c
@@ -218,7 +218,6 @@ set_server(lua_State *lstate)
 	if (!check_table(lstate))
 		return 0;
 	lua2sj_boolean(lstate, "daemon",      1, FORKFLAG,     &daemon_enable);
-	lua2sj_string(lstate,  "pidfile",     1, PIDFILE,      pid_file,    sizeof(pid_file));
 	lua2sj_integer(lstate, "max_client",  1, MAXCLIENTNUM, &max_client);
 	lua2sj_string(lstate,  "dict_dir",    1, DICTROOTDIR,  dict_dir,    sizeof(dict_dir));
 	lua2sj_string(lstate,  "user",        1, SJ3OWNER,     chuser_name, sizeof(chuser_name));
@@ -233,7 +232,6 @@ get_server(lua_State *lstate)
 {
 	lua_newtable(lstate);
 	sj2lua_boolean(lstate, "daemon",      daemon_enable);
-	sj2lua_string(lstate,  "pidfile",    pid_file);
 	sj2lua_integer(lstate, "max_client",  max_client);
 	sj2lua_string(lstate,  "dict_dir",    dict_dir);
 	return 1;
diff --git a/trunk/src/sj3serv/sj3serv.h b/trunk/src/sj3serv/sj3serv.h
index d4ea681..fe197dd 100644
--- a/trunk/src/sj3serv/sj3serv.h
+++ b/trunk/src/sj3serv/sj3serv.h
@@ -109,7 +109,6 @@ int open_debug();
 void debug_out(int, const char *, ...);
 
 /* main.c */
-int make_pidfile();
 void server_terminate();
 
 extern char program_name [MAXPATHLEN];
diff --git a/trunk/src/sj3serv/sj3serv.lua.example.in b/trunk/src/sj3serv/sj3serv.lua.example.in
index 24fd829..17380c7 100644
--- a/trunk/src/sj3serv/sj3serv.lua.example.in
+++ b/trunk/src/sj3serv/sj3serv.lua.example.in
@@ -21,11 +21,6 @@ sj3.set_server {
    --  set daemonize
    daemon = true,
 
-   -- lockfile: String
-   --  pid file name
-   --  Note: this file is created after chroot
-   pidfile = "/run/sj3serv.pid",
-
    -- max_client: Integer
    --  client connect limit value
    max_client = 512,