GSocketConnectable

GSocketConnectable — Interface for potential socket endpoints

Types and Values

Object Hierarchy

    GInterface
    ╰── GSocketConnectable

Prerequisites

GSocketConnectable requires GObject.

Known Implementations

GSocketConnectable is implemented by GInetSocketAddress, GNativeSocketAddress, GNetworkAddress, GNetworkService, GProxyAddress, GSocketAddress and GUnixSocketAddress.

Includes

#include <gio/gio.h>

Description

Objects that describe one or more potential socket endpoints implement GSocketConnectable. Callers can then use g_socket_connectable_enumerate() to get a GSocketAddressEnumerator to try out each socket address in turn until one succeeds, as shown in the sample code below.

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MyConnectionType *
connect_to_host (const char    *hostname,
                 guint16        port,
                 GCancellable  *cancellable,
                 GError       **error)
{
  MyConnection *conn = NULL;
  GSocketConnectable *addr;
  GSocketAddressEnumerator *enumerator;
  GSocketAddress *sockaddr;
  GError *conn_error = NULL;

  addr = g_network_address_new (hostname, port);
  enumerator = g_socket_connectable_enumerate (addr);
  g_object_unref (addr);

  // Try each sockaddr until we succeed. Record the first connection error,
  // but not any further ones (since they'll probably be basically the same
  // as the first).
  while (!conn && (sockaddr = g_socket_address_enumerator_next (enumerator, cancellable, error))
    {
      conn = connect_to_sockaddr (sockaddr, conn_error ? NULL : &conn_error);
      g_object_unref (sockaddr);
    }
  g_object_unref (enumerator);

  if (conn)
    {
      if (conn_error)
        {
          // We couldn't connect to the first address, but we succeeded
          // in connecting to a later address.
          g_error_free (conn_error);
        }
      return conn;
    }
  else if (error)
    {
      /// Either initial lookup failed, or else the caller cancelled us.
      if (conn_error)
        g_error_free (conn_error);
      return NULL;
    }
  else
    {
      g_error_propagate (error, conn_error);
      return NULL;
    }
}

Functions

g_socket_connectable_enumerate ()

GSocketAddressEnumerator *
g_socket_connectable_enumerate (GSocketConnectable *connectable);

Creates a GSocketAddressEnumerator for connectable .

Parameters

connectable

a GSocketConnectable

 

Returns

a new GSocketAddressEnumerator.

[transfer full]

Since: 2.22


g_socket_connectable_proxy_enumerate ()

GSocketAddressEnumerator *
g_socket_connectable_proxy_enumerate (GSocketConnectable *connectable);

Creates a GSocketAddressEnumerator for connectable that will return GProxyAddresses for addresses that you must connect to via a proxy.

If connectable does not implement g_socket_connectable_proxy_enumerate(), this will fall back to calling g_socket_connectable_enumerate().

Parameters

connectable

a GSocketConnectable

 

Returns

a new GSocketAddressEnumerator.

[transfer full]

Since: 2.26


g_socket_connectable_to_string ()

gchar *
g_socket_connectable_to_string (GSocketConnectable *connectable);

Format a GSocketConnectable as a string. This is a human-readable format for use in debugging output, and is not a stable serialization format. It is not suitable for use in user interfaces as it exposes too much information for a user.

If the GSocketConnectable implementation does not support string formatting, the implementation’s type name will be returned as a fallback.

Parameters

connectable

a GSocketConnectable

 

Returns

the formatted string.

[transfer full]

Since: 2.48

Types and Values

GSocketConnectable

typedef struct _GSocketConnectable GSocketConnectable;

Interface for objects that contain or generate GSocketAddresses.


struct GSocketConnectableIface

struct GSocketConnectableIface {
  GTypeInterface g_iface;

  /* Virtual Table */

  GSocketAddressEnumerator * (* enumerate)       (GSocketConnectable *connectable);

  GSocketAddressEnumerator * (* proxy_enumerate) (GSocketConnectable *connectable);

  gchar                    * (* to_string)       (GSocketConnectable *connectable);
};

Provides an interface for returning a GSocketAddressEnumerator and GProxyAddressEnumerator

Members

enumerate ()

Creates a GSocketAddressEnumerator

 

proxy_enumerate ()

Creates a GProxyAddressEnumerator

 

to_string ()

Format the connectable’s address as a string for debugging. Implementing this is optional. (Since: 2.48)