poll()

Check whether a socket read would block. More...

Collaboration diagram for poll():

Functions
static int	tls_socket_poll (struct Connection *conn, time_t wait_secs)
	Check whether a socket read would block - Implements Connection::poll() -. More...
static int	ssl_socket_poll (struct Connection *conn, time_t wait_secs)
	Check whether a socket read would block - Implements Connection::poll() -. More...
int	raw_socket_poll (struct Connection *conn, time_t wait_secs)
	Checks whether reads would block - Implements Connection::poll() -. More...
static int	mutt_sasl_conn_poll (struct Connection *conn, time_t wait_secs)
	Check an SASL connection for data - Implements Connection::poll() -. More...
static int	tunnel_socket_poll (struct Connection *conn, time_t wait_secs)
	Checks whether tunnel reads would block - Implements Connection::poll() -. More...
static int	zstrm_poll (struct Connection *conn, time_t wait_secs)
	Checks whether reads would block - Implements Connection::poll() -. More...

Variables
int(*	SaslSockData::poll )(struct Connection *conn, time_t wait_secs)
	Check whether a socket read would block - Implements Connection::poll() -. More...

Detailed Description

Check whether a socket read would block.

Parameters

conn	Connection to a server
wait_secs	How long to wait for a response

Return values

>0	There is data to read
0	Read would block
-1	Connection doesn't support polling

Function Documentation

tls_socket_poll()

static int tls_socket_poll ( struct Connection *  conn, time_t  wait_secs  )

static

Check whether a socket read would block - Implements Connection::poll() -.

Definition at line 983 of file gnutls.c.

{
  struct TlsSockData *data = conn->sockdata;
  if (!data)
    return -1;
 
  if (gnutls_record_check_pending(data->session))
    return 1;
 
  return raw_socket_poll(conn, wait_secs);
}

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ssl_socket_poll()

static int ssl_socket_poll ( struct Connection *  conn, time_t  wait_secs  )

static

Check whether a socket read would block - Implements Connection::poll() -.

Definition at line 1296 of file openssl.c.

{
  if (!conn)
    return -1;
 
  if (SSL_has_pending(sockdata(conn)->ssl))
    return 1;
 
  return raw_socket_poll(conn, wait_secs);
}

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raw_socket_poll()

int raw_socket_poll	(	struct Connection *	conn,
		time_t	wait_secs
	)

Checks whether reads would block - Implements Connection::poll() -.

Definition at line 340 of file raw.c.

{
  if (conn->fd < 0)
    return -1;
 
  fd_set rfds;
  struct timeval tv;
 
  uint64_t wait_millis = wait_secs * 1000UL;
 
  while (true)
  {
    tv.tv_sec = wait_millis / 1000;
    tv.tv_usec = (wait_millis % 1000) * 1000;
 
    FD_ZERO(&rfds);
    FD_SET(conn->fd, &rfds);
 
    uint64_t pre_t = mutt_date_now_ms();
    const int rc = select(conn->fd + 1, &rfds, NULL, NULL, &tv);
    uint64_t post_t = mutt_date_now_ms();
 
    if ((rc > 0) || ((rc < 0) && (errno != EINTR)))
      return rc;
 
    if (SigInt)
      mutt_query_exit();
 
    wait_millis += pre_t;
    if (wait_millis <= post_t)
      return 0;
    wait_millis -= post_t;
  }
}

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mutt_sasl_conn_poll()

static int mutt_sasl_conn_poll ( struct Connection *  conn, time_t  wait_secs  )

static

Check an SASL connection for data - Implements Connection::poll() -.

Definition at line 581 of file sasl.c.

{
  struct SaslSockData *sasldata = conn->sockdata;
  int rc;
 
  conn->sockdata = sasldata->sockdata;
  rc = sasldata->poll(conn, wait_secs);
  conn->sockdata = sasldata;
 
  return rc;
}

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tunnel_socket_poll()

static int tunnel_socket_poll ( struct Connection *  conn, time_t  wait_secs  )

static

Checks whether tunnel reads would block - Implements Connection::poll() -.

Definition at line 194 of file tunnel.c.

{
  struct TunnelSockData *tunnel = conn->sockdata;
  int ofd;
  int rc;
 
  ofd = conn->fd;
  conn->fd = tunnel->fd_read;
  rc = raw_socket_poll(conn, wait_secs);
  conn->fd = ofd;
 
  return rc;
}

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zstrm_poll()

static int zstrm_poll ( struct Connection *  conn, time_t  wait_secs  )

static

Checks whether reads would block - Implements Connection::poll() -.

Definition at line 211 of file zstrm.c.

{
  struct ZstrmContext *zctx = conn->sockdata;
 
  mutt_debug(LL_DEBUG5, "%s\n",
             (zctx->read.z.avail_out == 0) || (zctx->read.pos > 0) ?
                 "last read wrote full buffer" :
                 "falling back on next stream");
  if ((zctx->read.z.avail_out == 0) || (zctx->read.pos > 0))
    return 1;
 
  return zctx->next_conn.poll(&zctx->next_conn, wait_secs);
}

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Variable Documentation

poll

int(* SaslSockData::poll) (struct Connection *conn, time_t wait_secs)

Check whether a socket read would block - Implements Connection::poll() -.

Definition at line 92 of file sasl.c.