diff --git a/ttynvt.c b/ttynvt.c
index 9f6622f..4af1416 100644
--- a/ttynvt.c
+++ b/ttynvt.c
@@ -65,7 +65,7 @@ typedef struct ttynvt {
     tn_ctx_t       *tn;
 } ttynvt_t;
 
-static void ttynvt_log(int prio, const char *fmt, ...)
+static void _log(int prio, const char *fmt, ...)
 {
     va_list         arg;
 
@@ -81,7 +81,7 @@ static void ttynvt_release(fuse_req_t req, struct fuse_file_info *info)
 {
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
 
-    ttynvt_log(LOG_INFO, "connection closed\n");
+    _log(LOG_INFO, "connection closed\n");
 
     close(tty->fds[0].fd);
 
@@ -99,7 +99,7 @@ static void ttynvt_release(fuse_req_t req, struct fuse_file_info *info)
     fuse_reply_err(req, 0);
 }
 
-static void ttynvt_notify(ttynvt_t * tty)
+static void _notify(ttynvt_t * tty)
 {
     pthread_mutex_lock(&tty->poll_lock);
     if (tty->ph)
@@ -112,7 +112,7 @@ static void ttynvt_notify(ttynvt_t * tty)
     pthread_cond_signal(&tty->cond);
 }
 
-static void ttynvt_update_notify(ttynvt_t * tty, struct fuse_pollhandle *ph)
+static void _update_notify(ttynvt_t * tty, struct fuse_pollhandle *ph)
 {
     pthread_mutex_lock(&tty->poll_lock);
     struct fuse_pollhandle *tmp_ph = tty->ph;
@@ -123,7 +123,7 @@ static void ttynvt_update_notify(ttynvt_t * tty, struct fuse_pollhandle *ph)
         fuse_pollhandle_destroy(tmp_ph);
 }
 
-static unsigned int ttynvt_write_avail(ttynvt_t * tty)
+static unsigned int _write_avail(ttynvt_t * tty)
 {
     size_t          write_avail;
     int             used;
@@ -138,7 +138,7 @@ static unsigned int ttynvt_write_avail(ttynvt_t * tty)
     return write_avail;
 }
 
-static int ttynvt_read_avail(ttynvt_t * tty)
+static int _read_avail(ttynvt_t * tty)
 {
     int             read_avail;
 
@@ -150,7 +150,7 @@ static int ttynvt_read_avail(ttynvt_t * tty)
     return read_avail;
 }
 
-static void    *ttynvt_read_net(void *arg)
+static void    *_read_net(void *arg)
 {
     ttynvt_t       *tty = (ttynvt_t *) arg;
     ssize_t         res;
@@ -182,7 +182,7 @@ static void    *ttynvt_read_net(void *arg)
                 /*buffer overflow */
                 tty->blen = 0;
                 read_avail = RX_BUF_SIZE;
-                ttynvt_log(LOG_WARNING, "Rx buffer overflow\n");
+                _log(LOG_WARNING, "Rx buffer overflow\n");
             }
             res = read(tty->fds[0].fd, tty->buf + tty->blen, read_avail);
             if (res <= 0)
@@ -198,7 +198,7 @@ static void    *ttynvt_read_net(void *arg)
                 if (tn_res == 0)
                 {
                     tty->rxcnt = tty->blen;
-                    ttynvt_notify(tty);
+                    _notify(tty);
                 }
                 pthread_mutex_unlock(&tty->tty_lock);
             }
@@ -206,17 +206,17 @@ static void    *ttynvt_read_net(void *arg)
     }
 
     if (res == 0)
-        ttynvt_log(LOG_INFO, "Connection closed by remote host\n");
+        _log(LOG_INFO, "Connection closed by remote host\n");
     else
-        ttynvt_log(LOG_ERR, "Rx read error:%s\n", strerror(errno));
+        _log(LOG_ERR, "Rx read error:%s\n", strerror(errno));
 
     tty->error = 1;
-    ttynvt_notify(tty);
+    _notify(tty);
 
     return 0;
 }
 
-static int srv_connect(const char *host, unsigned int port)
+static int _srv_connect(const char *host, unsigned int port)
 {
     struct sockaddr_in serveraddr;
     struct hostent *server;
@@ -225,14 +225,14 @@ static int srv_connect(const char *host, unsigned int port)
     sockfd = socket(AF_INET, SOCK_STREAM, 0);
     if (sockfd < 0)
     {
-        ttynvt_log(LOG_ERR, "Socket open failed: %s\n", strerror(errno));
+        _log(LOG_ERR, "Socket open failed: %s\n", strerror(errno));
         return sockfd;
     }
 
     server = gethostbyname(host);
     if (server == NULL)
     {
-        ttynvt_log(LOG_ERR, "Cannot resolve host name: %s\n", strerror(errno));
+        _log(LOG_ERR, "Cannot resolve host name: %s\n", strerror(errno));
         close(sockfd);
         return -1;
     }
@@ -246,8 +246,8 @@ static int srv_connect(const char *host, unsigned int port)
     err = connect(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
     if (err < 0)
     {
-        ttynvt_log(LOG_ERR, "Failed to connect to: %s:%u:%s\n",
-                   host, port, strerror(errno));
+        _log(LOG_ERR, "Failed to connect to: %s:%u:%s\n",
+             host, port, strerror(errno));
         close(sockfd);
         return -1;
     }
@@ -255,7 +255,7 @@ static int srv_connect(const char *host, unsigned int port)
     return sockfd;
 }
 
-static int srv_write(void *cctx, const void *buf, int len)
+static int _srv_write(void *cctx, const void *buf, int len)
 {
     ttynvt_t       *tty = cctx;
     int             res;
@@ -265,7 +265,7 @@ static int srv_write(void *cctx, const void *buf, int len)
     return res;
 }
 
-static int srv_read(void *cctx, int timeout)
+static int _srv_read(void *cctx, int timeout)
 {
     ttynvt_t       *tty = cctx;
     int             res;
@@ -294,13 +294,13 @@ static int srv_read(void *cctx, int timeout)
     return 1;
 }
 
-static void modem_status_cb(void *cctx, int status)
+static void _modem_status_cb(void *cctx, int status)
 {
     ttynvt_t       *tty = cctx;
 
     tty->mcr &= ~(TIOCM_CD | TIOCM_RI | TIOCM_CTS | TIOCM_DSR);
 
-    ttynvt_log(LOG_INFO, "Modem status: 0x%02x\n", status);
+    _log(LOG_INFO, "Modem status: 0x%02x\n", status);
 
     if (status & TNS_STATE_CD)
         tty->mcr |= TIOCM_CD;
@@ -326,7 +326,7 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
         return;
     }
 
-    tty->tn = telnet_ctx_init(tty, srv_write, srv_read, modem_status_cb);
+    tty->tn = telnet_ctx_init(tty, _srv_write, _srv_read, _modem_status_cb);
     if (!tty->tn)
     {
         free(tty);
@@ -334,7 +334,7 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
         return;
     }
 
-    sockfd = srv_connect(ttynvt_param.host, ttynvt_param.port);
+    sockfd = _srv_connect(ttynvt_param.host, ttynvt_param.port);
     if (sockfd < 0)
     {
         free(tty->tn);
@@ -369,7 +369,7 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
     if (pthread_mutex_init(&tty->tty_lock, NULL) < 0 ||
         pthread_mutex_init(&tty->poll_lock, NULL) < 0 ||
         pthread_cond_init(&tty->cond, NULL) < 0 ||
-        pthread_create(&tty->thread_id, NULL, &ttynvt_read_net, tty))
+        pthread_create(&tty->thread_id, NULL, &_read_net, tty))
     {
         free(tty->tn);
         free(tty);
@@ -381,8 +381,8 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
     info->nonseekable = 1;
     info->direct_io = 1;
 
-    ttynvt_log(LOG_INFO, "Open connection to server: %s:%d\n",
-               ttynvt_param.host, ttynvt_param.port);
+    _log(LOG_INFO, "Open connection to server: %s:%d\n",
+         ttynvt_param.host, ttynvt_param.port);
 
     fuse_reply_open(req, info);
 }
@@ -397,7 +397,7 @@ ttynvt_read(fuse_req_t req, size_t size, off_t off,
     {
         if (tty->epipe == 0)
         {
-            ttynvt_log(LOG_WARNING, "Rx EPIPE\n");
+            _log(LOG_WARNING, "Rx EPIPE\n");
             tty->epipe = 1;
             fuse_reply_buf(req, tty->buf, 0);
         }
@@ -450,7 +450,7 @@ ttynvt_write(fuse_req_t req, const char *data, size_t size, off_t off,
 
     if (tty->nonblock || (info->flags & O_NONBLOCK))
     {
-        size_t          write_avail = ttynvt_write_avail(tty);
+        size_t          write_avail = _write_avail(tty);
 
         if (size > write_avail)
             size = write_avail;
@@ -570,8 +570,7 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
                 telnet_rfc2217_ctl(tty->tn, TNS_CTL_DTR_ON);
             }
 
-            ttynvt_log
-                (LOG_DEBUG,
+            _log(LOG_DEBUG,
                  "CFG ioctl: %u%c%u%u %cCTSRTS %cCREAD %cHUPCL %cCLOCAL\n",
                  baudrate(speed), pstr[par], csize, sb,
                  tio.c_cflag & CRTSCTS ? '+' : '-',
@@ -598,7 +597,7 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
                                  * buffer */
         if (out_bufsz)
         {
-            size_t          rx_size = ttynvt_read_avail(tty);
+            size_t          rx_size = _read_avail(tty);
 
             fuse_reply_ioctl(req, 0, &rx_size, sizeof(size_t));
         }
@@ -613,7 +612,7 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
                                  * buffer */
         if (out_bufsz)
         {
-            size_t          tx_size = ttynvt_write_avail(tty);
+            size_t          tx_size = _write_avail(tty);
 
             fuse_reply_ioctl(req, 0, &tx_size, sizeof(size_t));
         }
@@ -723,9 +722,8 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
             tiocm = *(unsigned int *)in_buf;
             fuse_reply_ioctl(req, 0, 0, 0);
 
-            ttynvt_log(LOG_DEBUG, "CFG ioctl: DTR=%c RTS=%c\n",
-                       tiocm & TIOCM_DTR ? '1' : '0',
-                       tiocm & TIOCM_RTS ? '1' : '0');
+            _log(LOG_DEBUG, "CFG ioctl: DTR=%c RTS=%c\n",
+                 tiocm & TIOCM_DTR ? '1' : '0', tiocm & TIOCM_RTS ? '1' : '0');
 
             mcr &= ~(TIOCM_RTS | TIOCM_DTR);
             mcr |= tiocm & (TIOCM_RTS | TIOCM_DTR);
@@ -763,12 +761,12 @@ ttynvt_poll(fuse_req_t req, struct fuse_file_info *info,
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
     int             revents = 0;
 
-    ttynvt_update_notify(tty, ph);
+    _update_notify(tty, ph);
 
-    if (ttynvt_write_avail(tty) > 0)
+    if (_write_avail(tty) > 0)
         revents |= POLLOUT;
 
-    if (ttynvt_read_avail(tty) > 0)
+    if (_read_avail(tty) > 0)
         revents |= POLLIN;
 
     if (tty->error)