1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
5 * Copyright (C) 2011 Data Differential, http://datadifferential.com/
6 * Copyright (C) 2006-2009 Brian Aker
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10 * modification, are permitted provided that the following conditions are
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14 * notice, this list of conditions and the following disclaimer.
16 * * Redistributions in binary form must reproduce the above
17 * copyright notice, this list of conditions and the following disclaimer
18 * in the documentation and/or other materials provided with the
21 * * The names of its contributors may not be used to endorse or
22 * promote products derived from this software without specific prior
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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39 #ifndef __LIBMEMCACHED_IO_H__
40 #define __LIBMEMCACHED_IO_H__
42 #if defined(BUILDING_LIBMEMCACHED)
44 #include "libmemcached/memcached.h"
46 #define MAX_UDP_DATAGRAM_LENGTH 1400
47 #define UDP_DATAGRAM_HEADER_LENGTH 8
48 #define UDP_REQUEST_ID_MSG_SIG_DIGITS 10
49 #define UDP_REQUEST_ID_THREAD_MASK 0xFFFF << UDP_REQUEST_ID_MSG_SIG_DIGITS
50 #define get_udp_datagram_request_id(A) ntohs((A)->request_id)
51 #define get_udp_datagram_seq_num(A) ntohs((A)->sequence_number)
52 #define get_udp_datagram_num_datagrams(A) ntohs((A)->num_datagrams)
53 #define get_msg_num_from_request_id(A) ( (A) & (~(UDP_REQUEST_ID_THREAD_MASK)) )
54 #define get_thread_id_from_request_id(A) ( (A) & (UDP_REQUEST_ID_THREAD_MASK) ) >> UDP_REQUEST_ID_MSG_SIG_DIGITS
55 #define generate_udp_request_thread_id(A) (A) << UDP_REQUEST_ID_MSG_SIG_DIGITS
56 #define UDP_REQUEST_ID_MAX_THREAD_ID get_thread_id_from_request_id(0xFFFF)
58 struct udp_datagram_header_st
61 uint16_t sequence_number
;
62 uint16_t num_datagrams
;
66 struct libmemcached_io_vector_st
77 memcached_return_t
memcached_io_wait_for_write(memcached_server_write_instance_st ptr
);
80 ssize_t
memcached_io_writev(memcached_server_write_instance_st ptr
,
81 const struct libmemcached_io_vector_st
*vector
,
82 size_t number_of
, bool with_flush
);
85 ssize_t
memcached_io_write(memcached_server_write_instance_st ptr
,
86 const void *buffer
, size_t length
, bool with_flush
);
89 void memcached_io_reset(memcached_server_write_instance_st ptr
);
92 memcached_return_t
memcached_io_read(memcached_server_write_instance_st ptr
,
93 void *buffer
, size_t length
, ssize_t
*nread
);
95 /* Read a line (terminated by '\n') into the buffer */
97 memcached_return_t
memcached_io_readline(memcached_server_write_instance_st ptr
,
102 memcached_return_t
memcached_io_close(memcached_server_write_instance_st ptr
);
104 /* Read n bytes of data from the server and store them in dta */
106 memcached_return_t
memcached_safe_read(memcached_server_write_instance_st ptr
,
111 memcached_return_t
memcached_io_init_udp_header(memcached_server_write_instance_st ptr
,
115 memcached_server_write_instance_st
memcached_io_get_readable_server(memcached_st
*memc
);
121 #endif /* BUILDING_LIBMEMCACHED */
123 #endif /* __LIBMEMCACHED_IO_H__ */