source3/include/ctdb_packet.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    CTDB Packet handling
   4    Copyright (C) Volker Lendecke 2007
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 /*
  21  * A ctdb_packet context is a wrapper around a bidirectional file descriptor,
  22  * hiding the handling of individual requests.
  23  */
  24
  25 struct ctdb_packet_context;
  26
  27 /*
  28  * Initialize a ctdb_packet context. The fd is given to the ctdb_packet context, meaning
  29  * that it is automatically closed when the ctdb_packet context is freed.
  30  */
  31 struct ctdb_packet_context *ctdb_packet_init(TALLOC_CTX *mem_ctx, int fd);
  32
  33 /*
  34  * Pull data from the fd
  35  */
  36 NTSTATUS ctdb_packet_fd_read(struct ctdb_packet_context *ctx);
  37
  38 /*
  39  * Sync read, wait for the next chunk
  40  */
  41 NTSTATUS ctdb_packet_fd_read_sync_timeout(struct ctdb_packet_context *ctx, int timeout);
  42
  43 /*
  44  * Handle an incoming ctdb_packet:
  45  * Return False if none is available
  46  * Otherwise return True and store the callback result in *status
  47  * Callback must either talloc_move or talloc_free buf
  48  */
  49 bool ctdb_packet_handler(struct ctdb_packet_context *ctx,
  50                     bool (*full_req)(const uint8_t *buf,
  51                                      size_t available,
  52                                      size_t *length,
  53                                      void *private_data),
  54                     NTSTATUS (*callback)(uint8_t *buf, size_t length,
  55                                          void *private_data),
  56                     void *private_data,
  57                     NTSTATUS *status);
  58
  59 /*
  60  * How many bytes of outgoing data do we have pending?
  61  */
  62 size_t ctdb_packet_outgoing_bytes(struct ctdb_packet_context *ctx);
  63
  64 /*
  65  * Push data to the fd
  66  */
  67 NTSTATUS ctdb_packet_fd_write(struct ctdb_packet_context *ctx);
  68
  69 /*
  70  * Sync flush all outgoing bytes
  71  */
  72 NTSTATUS ctdb_packet_flush(struct ctdb_packet_context *ctx);
  73
  74 /*
  75  * Send a list of DATA_BLOBs
  76  *
  77  * Example:  ctdb_packet_send(ctx, 2, data_blob_const(&size, sizeof(size)),
  78  *                       data_blob_const(buf, size));
  79  */
  80 NTSTATUS ctdb_packet_send(struct ctdb_packet_context *ctx, int num_blobs, ...);
  81
  82 /*
  83  * Get the ctdb_packet context's file descriptor
  84  */
  85 int ctdb_packet_get_fd(struct ctdb_packet_context *ctx);