2.3.2/include/libvdeplug.h

   1 /*
   2  * libvdeplug - A library to connect to a VDE Switch.
   3  * Copyright (C) 2006 Renzo Davoli, University of Bologna
   4  *
   5  * This library is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU Lesser General Public License as published by
   7  * the Free Software Foundation version 2.1 of the License, or (at
   8  * your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
  18  */
  19
  20 #ifndef _VDELIB_H
  21 #define _VDELIB_H
  22 #include <sys/types.h>
  23 #define LIBVDEPLUG_INTERFACE_VERSION 1
  24
  25 struct vdeconn;
  26
  27 typedef struct vdeconn VDECONN;
  28
  29 /* Open a VDE connection.
  30  * vde_open_options:
  31  *   port: connect to a specific port of the switch (0=any)
  32  *   group: change the ownership of the communication port to a specific group
  33  *        (NULL=no change)
  34  *   mode: set communication port mode (if 0 standard socket mode applies)
  35  */
  36 struct vde_open_args {
  37         int port;
  38         char *group;
  39         mode_t mode;
  40 };
  41
  42 /* vde_open args:
  43  *   vde_switch: switch id (path)
  44  *   descr: description (it will appear in the port description on the switch)
  45  */
  46 #define vde_open(vde_switch,descr,open_args) \
  47         vde_open_real((vde_switch),(descr),LIBVDEPLUG_INTERFACE_VERSION,(open_args))
  48 VDECONN *vde_open_real(char *vde_switch,char *descr,int interface_version,
  49         struct vde_open_args *open_args);
  50
  51 ssize_t vde_recv(VDECONN *conn,void *buf,size_t len,int flags);
  52
  53 ssize_t vde_send(VDECONN *conn,const void *buf,size_t len,int flags);
  54
  55 /* for select/poll when this fd receive data, there are packets to recv
  56  * (call vde_recv) */
  57 int vde_datafd(VDECONN *conn);
  58
  59 /* for select/poll. the ctl socket is silent after the initial handshake.
  60  * when EOF the switch has closed the connection */
  61 int vde_ctlfd(VDECONN *conn);
  62
  63 int vde_close(VDECONN *conn);
  64
  65 /* vdestream */
  66
  67 struct vdestream;
  68
  69 typedef struct vdestream VDESTREAM;
  70
  71 #define PACKET_LENGTH_ERROR 1
  72
  73 VDESTREAM *vdestream_open(void *opaque,
  74                 int fdout,
  75                 ssize_t (*frecv)(void *opaque, void *buf, size_t count),
  76                 void (*ferr)(void *opaque, int type, char *format, ...)
  77                 );
  78
  79 ssize_t vdestream_send(VDESTREAM *vdestream, const void *buf, size_t len);
  80
  81 void vdestream_recv(VDESTREAM *vdestream, unsigned char *buf, size_t len);
  82
  83 void vdestream_close(VDESTREAM *vdestream);
  84
  85 #endif