git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/io.h

   1 /* LibMemcached
   2  * Copyright (C) 2006-2009 Brian Aker
   3  * All rights reserved.
   4  *
   5  * Use and distribution licensed under the BSD license.  See
   6  * the COPYING file in the parent directory for full text.
   7  *
   8  * Summary: Server IO, Not public!
   9  *
  10  */
  11
  12 #ifndef LIBMEMCACHED_MEMCACHED_IO_H
  13 #define LIBMEMCACHED_MEMCACHED_IO_H
  14
  15 #ifdef __cplusplus
  16 extern "C" {
  17 #endif
  18
  19 #if defined(BUILDING_LIBMEMCACHED)
  20
  21 #include "libmemcached/memcached.h"
  22
  23 #define MAX_UDP_DATAGRAM_LENGTH 1400
  24 #define UDP_DATAGRAM_HEADER_LENGTH 8
  25 #define UDP_REQUEST_ID_MSG_SIG_DIGITS 10
  26 #define UDP_REQUEST_ID_THREAD_MASK 0xFFFF << UDP_REQUEST_ID_MSG_SIG_DIGITS
  27 #define get_udp_datagram_request_id(A) ntohs((A)->request_id)
  28 #define get_udp_datagram_seq_num(A) ntohs((A)->sequence_number)
  29 #define get_udp_datagram_num_datagrams(A) ntohs((A)->num_datagrams)
  30 #define get_msg_num_from_request_id(A) ( (A) & (~(UDP_REQUEST_ID_THREAD_MASK)) )
  31 #define get_thread_id_from_request_id(A) ( (A) & (UDP_REQUEST_ID_THREAD_MASK) ) >> UDP_REQUEST_ID_MSG_SIG_DIGITS
  32 #define generate_udp_request_thread_id(A) (A) << UDP_REQUEST_ID_MSG_SIG_DIGITS
  33 #define UDP_REQUEST_ID_MAX_THREAD_ID get_thread_id_from_request_id(0xFFFF)
  34
  35 struct udp_datagram_header_st {
  36   uint16_t request_id;
  37   uint16_t sequence_number;
  38   uint16_t num_datagrams;
  39   uint16_t reserved;
  40 };
  41
  42 ssize_t memcached_io_write(memcached_server_st *ptr,
  43                            const void *buffer, size_t length, char with_flush);
  44 void memcached_io_reset(memcached_server_st *ptr);
  45 memcached_return_t memcached_io_read(memcached_server_st *ptr,
  46                                      void *buffer, size_t length, ssize_t *nread);
  47 /* Read a line (terminated by '\n') into the buffer */
  48 memcached_return_t memcached_io_readline(memcached_server_st *ptr,
  49                                          char *buffer_ptr,
  50                                          size_t size);
  51 memcached_return_t memcached_io_close(memcached_server_st *ptr);
  52 /* Read n bytes of data from the server and store them in dta */
  53 memcached_return_t memcached_safe_read(memcached_server_st *ptr,
  54                                        void *dta,
  55                                        size_t size);
  56 /* Read a single response from the server */
  57 memcached_return_t memcached_read_one_response(memcached_server_st *ptr,
  58                                                char *buffer, size_t buffer_length,
  59                                                memcached_result_st *result);
  60 memcached_return_t memcached_io_init_udp_header(memcached_server_st *ptr,
  61                                                 uint16_t thread_id);
  62
  63 memcached_server_st *memcached_io_get_readable_server(memcached_st *memc);
  64
  65 #endif /* BUILDING_LIBMEMCACHED */
  66
  67 #ifdef __cplusplus
  68 }
  69 #endif
  70
  71 #endif /* LIBMEMCACHED_MEMCACHED_IO_H */