ttynvt version 0.12

We now properly kick the connected clients hanging in reads (cu) instead
of locking up.

configure.ac

@@ -1,4 +1,4 @@
-m4_define([pkg_version],  [0.11])
+m4_define([pkg_version],  [0.12])
 #m4_define([pkg_revision], [005])
 m4_define([pkg_version],  m4_ifdef([pkg_revision], [pkg_version.pkg_revision], [pkg_version]))
 

telnet.h

@@ -31,7 +31,7 @@ extern tn_ctx_t *telnet_ctx_init(void *cctx, srv_tx_f * ftx, srv_rx_f * frx,
 
 extern int      telnet_open(tn_ctx_t * tcc);
 
-extern int      telnet_rx(tn_ctx_t * tcc, char *buf, size_t * plen);
+extern int      telnet_rx(tn_ctx_t * tcc, char *buf, int *plen);
 extern int      telnet_tx(tn_ctx_t * tcc, const char *buf, int len);
 
 extern void     telnet_set_opt(tn_ctx_t * tcc, int opt, int prm,

telnet_basic.c

@@ -121,18 +121,18 @@ static void _telnet_handle_opt(tn_ctx_t * tcc, int opt,
     }
 }
 
-int telnet_rx(tn_ctx_t * tcc, char *buf, size_t * plen)
+int telnet_rx(tn_ctx_t * tcc, char *buf, int *plen)
 {
     char           *s, *p;
     unsigned char  *pu;
-    size_t          len, rem;
+    int             len, rem;
     int             np, nd;
     int             b1, b2;
 
     len = *plen;
     tcc->bytes_rx += len;
 
-    if (len < (size_t) tcc->off_rx)
+    if (len < (int)tcc->off_rx)
         tcc->off_rx = 0;
 
     for (s = buf + tcc->off_rx, rem = len - tcc->off_rx; rem > 0; s = p)

ttynvt.c

@@ -32,8 +32,8 @@
 #define TMP_BUF_SIZE 1024
 
 #define FD_NET     0
-#define FD_SLAVE   1
+#define FD_MASTER  1
-#define FD_MASTER  2
+#define FD_SLAVE   2
 
 #define _PRF_N_(no) __attribute__((__format__(__printf__, (no), (no) + 1)))
 #define _PRF2_ _PRF_N_(2)
@@ -45,6 +45,7 @@ static struct ttynvt_param {
     const char     *dev_name;
     char           *server;
     unsigned int    debug;
+    int             logstd;
     /* Derived */
     char            host[64];
     unsigned int    port;
@@ -55,23 +56,25 @@ static struct ttynvt_param {
 typedef struct {
     pthread_mutex_t tty_lock;
     pthread_mutex_t poll_lock;
-    pthread_t       thread_id;
+    pthread_t       ptid_poll;
+    pthread_t       ptid_read;
 
     struct fuse_pollhandle *ph;
 
+    volatile char   n_fds;
     struct pollfd   fds[3];
 
     char            net_buf[NET_BUF_SIZE];
-    size_t          net_cnt;
+    int             net_cnt;
-    char            tmp_buf[TMP_BUF_SIZE];
 
     struct termios  tio;
-    int             cmcr;
-    int             epipe;
 
+    int             cmcr;
     volatile int    smcr;
-    volatile int    error;
+
     volatile int    pollin;
+    volatile int    error;
+    int             epipe;
 
     tn_ctx_t       *tn;
 } ttynvt_t;
@@ -85,19 +88,48 @@ _PRF2_ static void _log(int prio, const char *fmt, ...)
     char            buf[256];
 
     va_start(arg, fmt);
-#if 0
-    vsyslog(prio, fmt, arg);
-#else
     vsnprintf(buf, sizeof(buf), fmt, arg);
+
+    if (ttynvt_param.logstd)
+        printf("[%d] %d: %s", gettid(), prio, buf);
+    else
         syslog(prio, "[%d] %s", gettid(), buf);
-#endif
+
     va_end(arg);
 }
 
+#define BPL 16                  /* Bytes per line */
+
+void _log_buf(int prio, const char *txt, const void *ptr_, unsigned int len)
+{
+    unsigned int    ix, i, imax;
+    int             l, n;
+    char            buf[128];
+    const unsigned char *ptr = ptr_;
+
+    for (ix = 0; ix < len || (len == 0 && ix == 0); ix += BPL)
+    {
+        n = snprintf(buf, sizeof(buf), "%s: %04x:", txt, ix);
+        if (n <= 0)
+            return;             /* Just playing it safe */
+        imax = (len - ix < BPL) ? len - ix : BPL;
+        for (i = 0; i < imax; i++)
+        {
+            l = snprintf(buf + n, sizeof(buf) - n, " %02x", *ptr++);
+            if (l <= 0)
+                return;         /* Just playing it safe */
+            n += l;
+        }
+        _log(prio, "%s\n", buf);
+    }
+}
+
 #define DBG(...) \
     if (ttynvt_param.debug > 0) _log(LOG_DEBUG, __VA_ARGS__)
 #define DBG2(...) \
     if (ttynvt_param.debug > 1) _log(LOG_DEBUG, __VA_ARGS__)
+#define DBG2_BUF(txt, ptr, len) \
+    if (ttynvt_param.debug > 1) _log_buf(LOG_DEBUG, txt, ptr, len)
 
 static volatile char _is_interrupted = 0;
 
@@ -105,6 +137,8 @@ static void sig_handler(int sig)
 {
     DBG("Interruped, signal = %d\n", sig);
     _is_interrupted = 1;
+    if (sig != SIGUSR2)
+        exit(0);
 }
 
 static void set_signal_handler(void)
@@ -116,6 +150,7 @@ static void set_signal_handler(void)
     sigemptyset(&(sa.sa_mask));
     sa.sa_flags = 0;
     sigaction(SIGUSR2, &sa, NULL);
+    sigaction(SIGTERM, &sa, NULL);
 }
 
 static void ttynvt_interrupted(fuse_req_t req, void *data)
@@ -147,12 +182,13 @@ static void ttynvt_release(fuse_req_t req, struct fuse_file_info *info)
 
     _log(LOG_INFO, "connection closed\n");
 
+    tty->n_fds = 0;
     close(tty->fds[FD_NET].fd);
     close(tty->fds[FD_MASTER].fd);
     close(tty->fds[FD_SLAVE].fd);
 
-    pthread_cancel(tty->thread_id);
+    pthread_cancel(tty->ptid_poll);
-    pthread_join(tty->thread_id, NULL);
+    pthread_join(tty->ptid_poll, NULL);
     pthread_mutex_destroy(&tty->tty_lock);
     pthread_mutex_destroy(&tty->poll_lock);
 
@@ -190,65 +226,86 @@ static void _update_notify(ttynvt_t * tty, struct fuse_pollhandle *ph)
 static void    *_read_net(void *arg)
 {
     ttynvt_t       *tty = (ttynvt_t *) arg;
-    ssize_t         res;
+    char            buf[TMP_BUF_SIZE];
+    int             res;
 
     pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
+    DBG2("%s: net_cnt=%d\n", __func__, tty->net_cnt);
 
-    while (1)
+    while (tty->n_fds > 0)
     {
-        res = poll(tty->fds, 3, -1);
+        tty->fds[FD_NET].revents = tty->fds[FD_MASTER].revents =
+            tty->fds[FD_SLAVE].revents = 0;
+        res = poll(tty->fds, tty->n_fds, -1);
+        DBG2("%s: res=%d N=%d events-N/M/S=%#x/%#x/%#x\n", __func__,
+             res, tty->n_fds,
+             tty->fds[FD_NET].revents, tty->fds[FD_MASTER].revents,
+             tty->fds[FD_SLAVE].revents);
         if (res < 0)
         {
             if (errno == EINTR)
                 continue;
-            else
             break;
         }
+        if (tty->n_fds == 0)
+            break;
+
         if (tty->fds[FD_NET].revents & POLLIN)
         {
             res = read(tty->fds[FD_NET].fd, tty->net_buf + tty->net_cnt,
                        NET_BUF_SIZE - tty->net_cnt);
             if (res < 0)
             {
-                _log(LOG_ERR, "net read error: %s\n", strerror(errno));
+                _log(LOG_ERR, "net read error: %m\n");
                 break;
             }
-            else if (res == 0)
+            if (res == 0)
             {
                 _log(LOG_INFO, "Connection closed by remote host\n");
                 break;
             }
             tty->net_cnt += res;
+            DBG2_BUF("Serv in A", tty->net_buf, tty->net_cnt);
             res = telnet_rx(tty->tn, tty->net_buf, &tty->net_cnt);
+            DBG2_BUF("Serv in B", tty->net_buf, tty->net_cnt);
             if (tty->net_cnt > 0 && res == 0)
             {
+                DBG2_BUF("TtyM out ", tty->net_buf, tty->net_cnt);
                 res =
                     write(tty->fds[FD_MASTER].fd, tty->net_buf, tty->net_cnt);
                 if (res < 0)
                 {
-                    _log(LOG_ERR, "master write error:%s\n", strerror(errno));
+                    _log(LOG_ERR, "master write error: %m\n");
                     break;
                 }
                 tty->net_cnt = 0;
             }
         }
+
         if (tty->fds[FD_MASTER].revents & POLLIN)
         {
-            res = read(tty->fds[FD_MASTER].fd, tty->tmp_buf, TMP_BUF_SIZE);
+            res = read(tty->fds[FD_MASTER].fd, buf, TMP_BUF_SIZE);
             if (res < 0)
             {
-                _log(LOG_ERR, "master read error:%s\n", strerror(errno));
+                _log(LOG_ERR, "master read error: %m\n");
                 break;
             }
-            telnet_tx(tty->tn, tty->tmp_buf, res);
+            DBG2_BUF("TtyM in  ", buf, res);
+            telnet_tx(tty->tn, buf, res);
         }
+
         if (tty->fds[FD_SLAVE].revents & POLLIN)
         {
             tty->pollin = 1;
+            tty->n_fds = 2;     /* Disable polling of Slave */
             _notify(tty);
         }
     }
 
+    DBG2("%s: done\n", __func__);
+    if (tty->ptid_read)
+        pthread_kill(tty->ptid_read, SIGUSR2);
+
     tty->error = 1;
     _notify(tty);
 
@@ -264,14 +321,14 @@ static int _srv_connect(const char *host, unsigned int port)
     sockfd = socket(AF_INET, SOCK_STREAM, 0);
     if (sockfd < 0)
     {
-        _log(LOG_ERR, "Socket open failed: %s\n", strerror(errno));
+        _log(LOG_ERR, "Socket open failed: %m\n");
         return sockfd;
     }
 
     server = gethostbyname(host);
     if (server == NULL)
     {
-        _log(LOG_ERR, "Cannot resolve host name: %s\n", strerror(errno));
+        _log(LOG_ERR, "Cannot resolve host name: %m\n");
         close(sockfd);
         return -1;
     }
@@ -285,8 +342,7 @@ static int _srv_connect(const char *host, unsigned int port)
     err = connect(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
     if (err < 0)
     {
-        _log(LOG_ERR, "Failed to connect to: %s:%u:%s\n",
+        _log(LOG_ERR, "Failed to connect to: %s:%u: %m\n", host, port);
-             host, port, strerror(errno));
         close(sockfd);
         return -1;
     }
@@ -299,8 +355,13 @@ static int _srv_write(void *cctx, const void *buf, int len)
     ttynvt_t       *tty = cctx;
     int             res;
 
+    DBG2_BUF("Serv out ", buf, len);
+
     res = write(tty->fds[FD_NET].fd, buf, len);
 
+    DBG2("%s: fd=%d: len=%u: res=%d\n", __func__,
+         tty->fds[FD_NET].fd, len, res);
+
     return res;
 }
 
@@ -309,9 +370,12 @@ static int _srv_read(void *cctx, int timeout)
     ttynvt_t       *tty = cctx;
     int             res;
 
+    DBG2("%s: net_cnt=%d\n", __func__, tty->net_cnt);
     while (1)
     {
         res = poll(&tty->fds[FD_NET], 1, timeout);
+        DBG("%s: res=%d events-N=%#x\n",
+            __func__, res, tty->fds[FD_NET].revents);
         if (res <= 0)
             return res;
 
@@ -319,10 +383,15 @@ static int _srv_read(void *cctx, int timeout)
         {
             res = read(tty->fds[FD_NET].fd, tty->net_buf + tty->net_cnt,
                        NET_BUF_SIZE - tty->net_cnt);
+            DBG2("%s: fd=%d: res=%d net_cnt=%d\n", __func__,
+                 tty->fds[FD_NET].fd, res, tty->net_cnt);
             if (res <= 0)
                 return res;
-            tty->net_cnt += (size_t) res;
+            tty->net_cnt += res;
+            DBG2_BUF("Serv in a", tty->net_buf, tty->net_cnt);
             res = telnet_rx(tty->tn, tty->net_buf, &tty->net_cnt);
+            DBG2_BUF("Serv in b", tty->net_buf, tty->net_cnt);
+            DBG2("%s: res=%d net_cnt=%d\n", __func__, res, tty->net_cnt);
             if (res == 0)
                 break;
         }
@@ -369,7 +438,7 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
     int             res;
     int             n;
 
-    DBG2("open: thread:%lu\n", pthread_self());
+    DBG("%s\n", __func__);
 
     tty = calloc(1, sizeof(*tty));
     if (!tty)
@@ -407,6 +476,8 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
     tty->fds[FD_MASTER].fd = fd;
     tty->fds[FD_MASTER].events = POLLIN;
 
+    memset(&ios, 0, sizeof(ios));
+
     ios.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
                      | INLCR | IGNCR | ICRNL | IXON);
     ios.c_oflag &= ~OPOST;
@@ -424,6 +495,11 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
     if ((fd = open(slave_name, O_RDWR | O_NOCTTY)) < 0) /* open slave */
         goto open_err;
 
+    ioctl(fd, TCGETS, &tty->tio);
+    tty->tio.c_cflag &= ~(CSIZE | PARENB);
+    tty->tio.c_cflag |= B115200 | CS8 | CREAD | CLOCAL;
+    ioctl(fd, TCSETS, &tty->tio);
+
     tty->fds[FD_SLAVE].fd = fd;
     tty->fds[FD_SLAVE].events = POLLIN;
 
@@ -435,12 +511,14 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
     }
     if ((res = pthread_mutex_init(&tty->tty_lock, NULL) < 0) ||
         (res = pthread_mutex_init(&tty->poll_lock, NULL) < 0) ||
-        (res = pthread_create(&tty->thread_id, NULL, &_read_net, tty)))
+        (res = pthread_create(&tty->ptid_poll, NULL, &_read_net, tty)))
     {
         errno = res;
         goto open_err;
     }
 
+    tty->n_fds = 3;             /* Initially poll Net, Master, and Slave */
+
     info->fh = (uintptr_t) tty;
     info->nonseekable = 1;
     info->direct_io = 1;
@@ -454,8 +532,8 @@ static void ttynvt_open(fuse_req_t req, struct fuse_file_info *info)
 
   open_err:
 
-    _log(LOG_INFO, "Connection to server: %s:%d failed:%s\n",
+    _log(LOG_INFO, "Connection to server: %s:%d failed: %m\n",
-         ttynvt_param.host, ttynvt_param.port, strerror(errno));
+         ttynvt_param.host, ttynvt_param.port);
 
     for (n = 0; n < 3; n++)
         if (tty->fds[n].fd >= 0)
@@ -471,16 +549,19 @@ ttynvt_read(fuse_req_t req, size_t size, off_t off,
             struct fuse_file_info *info)
 {
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
+    char            buf[TMP_BUF_SIZE];
     int             res;
 
+    DBG2("%s\n", __func__);
+
     if (tty->error)
     {
-        DBG2("read (slave) in error state, thread:%lu\n", pthread_self());
+        DBG2("%s: tty->error=%d\n", __func__, tty->error);
         if (tty->epipe == 0)
         {
             _log(LOG_WARNING, "Rx EPIPE\n");
             tty->epipe = 1;
-            fuse_reply_buf(req, tty->tmp_buf, 0);
+            fuse_reply_buf(req, NULL, 0);
         }
         else
             fuse_reply_err(req, EBADFD);
@@ -491,21 +572,24 @@ ttynvt_read(fuse_req_t req, size_t size, off_t off,
     if (size > TMP_BUF_SIZE)
         size = TMP_BUF_SIZE;
 
-    fuse_req_interrupt_func(req, ttynvt_interrupted, (void *)pthread_self());
+    tty->ptid_read = pthread_self();
-    res =
+    fuse_req_interrupt_func(req, ttynvt_interrupted, (void *)tty->ptid_read);
-        _is_interrupted ? -2 : read(tty->fds[FD_SLAVE].fd, tty->tmp_buf, size);
+    res = _is_interrupted ? -2 : read(tty->fds[FD_SLAVE].fd, buf, size);
     _is_interrupted = 0;
+    tty->ptid_read = 0;
+    tty->n_fds = 3;             /* Enable polling of Slave */
     fuse_req_interrupt_func(req, NULL, NULL);
     if (res < 0)
     {
-        DBG2("read (slave) error: %s\n", strerror(errno));
+        DBG2("%s: error: %m\n", __func__);
         fuse_reply_err(req, errno);
         return;
     }
 
-    DBG2("read (slave): size:%d, thread:%lu\n", res, pthread_self());
+    DBG2("%s: fd=%d: sz=%u/%u: '%.*s'\n", __func__,
+         tty->fds[FD_SLAVE].fd, res, (int)size, res, buf);
 
-    fuse_reply_buf(req, tty->tmp_buf, res);
+    fuse_reply_buf(req, buf, res);
 }
 
 static void
@@ -513,8 +597,10 @@ ttynvt_write(fuse_req_t req, const char *data, size_t size, off_t off,
              struct fuse_file_info *info)
 {
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
-    ssize_t         res;
+    int             res;
 
+    DBG2("%s: fd=%d: sz=%u: '%.*s'\n", __func__,
+         tty->fds[FD_SLAVE].fd, (int)size, (int)size, data);
 
     if (size == 0)
     {
@@ -524,6 +610,7 @@ ttynvt_write(fuse_req_t req, const char *data, size_t size, off_t off,
 
     if (tty->error)
     {
+        DBG2("%s: tty->error=%d\n", __func__, tty->error);
         fuse_reply_err(req, EPIPE);
         return;
     }
@@ -531,14 +618,12 @@ ttynvt_write(fuse_req_t req, const char *data, size_t size, off_t off,
     res = write(tty->fds[FD_SLAVE].fd, data, size);
     if (res < 0)
     {
-        DBG2("write (slave) error: %s\n", strerror(errno));
+        DBG2("%s: error: %m\n", __func__);
         tty->error = 1;
         fuse_reply_err(req, errno);
         return;
     }
 
-    DBG2("write (slave): size:%d, thread:%lu\n", (int)size, pthread_self());
-
     fuse_reply_write(req, res);
 }
 
@@ -590,6 +675,9 @@ static const char *_ioctl_name(int cmd)
         CASE(TCSBRK);
         CASE(TIOCGWINSZ);
         CASE(TIOCSWINSZ);
+        /* Controlling terminal */
+        CASE(TIOCSCTTY);
+        CASE(TIOCNOTTY);
         /* Exclusive mode */
         CASE(TIOCEXCL);
         CASE(TIOCGEXCL);
@@ -613,12 +701,10 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
              const void *in_buf, size_t in_bufsz, size_t out_bufsz)
 {
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
+    struct termios *tio = &tty->tio;
     struct winsize  ws;
     unsigned int    tiocm = 0;
     int             mcr;
-    static struct termios tio = {
-        .c_cflag = B115200 | CS8 | PARODD | CREAD | CLOCAL,
-    };
     int             val;
     int             res;
 
@@ -636,47 +722,50 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
             speed_t         speed;
             int             csize, par, sb;
 
-            memcpy(&tio, in_buf, in_bufsz);
+            memcpy(tio, in_buf, in_bufsz);
 
-            speed = tio.c_cflag & (CBAUD | CBAUDEX);
+            speed = tio->c_cflag & (CBAUD | CBAUDEX);
             val = htonl(baudrate(speed));
             telnet_rfc2217_cfg(tty->tn, TNS_SET_BAUDRATE, &val, 4);
 
-            if ((tio.c_cflag & CSIZE) == CS5)
+            if ((tio->c_cflag & CSIZE) == CS5)
                 csize = 5;
-            else if ((tio.c_cflag & CSIZE) == CS6)
+            else if ((tio->c_cflag & CSIZE) == CS6)
                 csize = 6;
-            else if ((tio.c_cflag & CSIZE) == CS7)
+            else if ((tio->c_cflag & CSIZE) == CS7)
                 csize = 7;
             else
                 csize = 8;
             telnet_rfc2217_cfg(tty->tn, TNS_SET_DATASIZE, &csize, 1);
 
-            if (tio.c_cflag & PARENB && tio.c_iflag & IGNPAR)
+            if (tio->c_cflag & PARENB && tio->c_iflag & IGNPAR)
                 par = 1;
 #ifdef CMSPAR
-            else if (tio.c_cflag & PARENB && tio.c_iflag & CMSPAR)
+            else if (tio->c_cflag & PARENB && tio->c_iflag & CMSPAR)
             {
-                if (tio.c_cflag & PARODD)
+                if (tio->c_cflag & PARODD)
                     par = 4;
                 else
                     par = 5;
             }
 #endif
-            else if (tio.c_cflag & PARENB)
+            else if (tio->c_cflag & PARENB)
                 par = 3;
             else
                 par = 1;
             telnet_rfc2217_cfg(tty->tn, TNS_SET_PARITY, &par, 1);
 
-            if (tio.c_cflag & CSTOPB)
+            if (tio->c_cflag & CSTOPB)
                 sb = 2;
             else
                 sb = 1;
             telnet_rfc2217_cfg(tty->tn, TNS_SET_STOPSIZE, &sb, 1);
 
-            if (tio.c_cflag & CRTSCTS)
+            if (tio->c_cflag & CRTSCTS)
+            {
+                tty->cmcr |= TIOCM_RTS;
                 telnet_rfc2217_ctl(tty->tn, TNS_CTL_CTSRTS);
+            }
 
             if (!(tty->cmcr & TIOCM_DTR) && speed != B0)
             {
@@ -686,19 +775,19 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
 
             DBG("termios: %u%c%u%u %cCTSRTS %cCREAD %cHUPCL %cCLOCAL\n",
                 baudrate(speed), pstr[par], csize, sb,
-                tio.c_cflag & CRTSCTS ? '+' : '-',
+                tio->c_cflag & CRTSCTS ? '+' : '-',
-                tio.c_cflag & CREAD ? '+' : '-',
+                tio->c_cflag & CREAD ? '+' : '-',
-                tio.c_cflag & HUPCL ? '+' : '-',
+                tio->c_cflag & HUPCL ? '+' : '-',
-                tio.c_cflag & CLOCAL ? '+' : '-');
+                tio->c_cflag & CLOCAL ? '+' : '-');
 
-            ioctl(tty->fds[FD_SLAVE].fd, cmd, &tio);
+            ioctl(tty->fds[FD_SLAVE].fd, cmd, tio);
 
             fuse_reply_ioctl(req, 0, 0, 0);
         }
         break;
     case TCGETS:
         CHECK_BUF_OUT(sizeof(struct termios));
-        fuse_reply_ioctl(req, 0, &tio, sizeof(struct termios));
+        fuse_reply_ioctl(req, 0, tio, sizeof(struct termios));
         break;
     case TIOCINQ:              /* Get the number of bytes in the input
                                  * buffer */
@@ -838,7 +927,6 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
     case TIOCSETD:
         CHECK_BUF_IN(sizeof(int));
         val = *(int *)in_buf;
-
         res = ioctl(tty->fds[FD_SLAVE].fd, TIOCSETD, &val);
         if (res < 0)
             fuse_reply_err(req, errno);
@@ -886,10 +974,15 @@ ttynvt_poll(fuse_req_t req, struct fuse_file_info *info,
             struct fuse_pollhandle *ph)
 {
     ttynvt_t       *tty = (ttynvt_t *) (uintptr_t) info->fh;
-    int             revents = 0;
+    int             revents;
+
+    DBG2("%s: tty->pollin=%d tty->error/epipe=%d/%d\n",
+         __func__, tty->pollin, tty->error, tty->epipe);
 
     _update_notify(tty, ph);
 
+    revents = POLLOUT;
+
     if (tty->pollin)
     {
         tty->pollin = 0;
@@ -898,11 +991,13 @@ ttynvt_poll(fuse_req_t req, struct fuse_file_info *info,
     if (tty->error)
     {
         if (tty->epipe == 0)
-            revents = POLLHUP | POLLIN;
+            revents |= POLLHUP | POLLIN;
         else
             revents = 0;
     }
 
+    DBG2("%s: revents=%#x\n", __func__, revents);
+
     fuse_reply_poll(req, revents);
 }
 
@@ -920,6 +1015,7 @@ static const struct cuse_lowlevel_ops ttynvt_op = {
 
 static const struct fuse_opt ttynvt_opts[] = {
     TTYNET_OPT("-D %d", debug, 1),
+    TTYNET_OPT("-E", logstd, 1),
     TTYNET_OPT("-M %u", major, 1),
     TTYNET_OPT("--maj=%u", major, 1),
     TTYNET_OPT("-m %u", minor, 1),
@@ -937,6 +1033,7 @@ static void print_help(void)
 {
     fprintf(stderr, "ttynvt Usage:\n"
             "\t-D level\tEnable debug\n"
+            "\t-E\t\tPrint debug to stdout (default is syslog)\n"
             "\t-M major, --maj=major\n"
             "\t-m minor, --min=minor\n"
             "\t-n name, --name=name (default: ttyNVT0)\n"
@@ -1018,14 +1115,14 @@ int main(int argc, char *argv[])
     switch (cpid)
     {
     case -1:
-        _log(LOG_ERR, "fork(): %m");
+        _log(LOG_ERR, "fork(): %m\n");
         return -1;
 
     case 0:                    /* Child */
         DBG("Child proceeding...\n");
         rc = cuse_lowlevel_main(args.argc, args.argv, &ci, &ttynvt_op, NULL);
         if (rc != 0)
-            _log(LOG_ERR, "ttynvt failed rc=%d", rc);
+            _log(LOG_ERR, "ttynvt failed rc=%d\n", rc);
         else
             DBG("Child exited\n");
         return rc;