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   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:
   9  *
  10  */
  11
  12 /*
  13   Common include file for libmemached
  14 */
  15
  16 #ifndef LIBMEMCACHED_COMMON_H
  17 #define LIBMEMCACHED_COMMON_H
  18
  19 #include "config.h"
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <strings.h>
  25 #include <ctype.h>
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <arpa/inet.h>
  30 #include <netdb.h>
  31 #include <unistd.h>
  32 #include <limits.h>
  33 #include <errno.h>
  34 #include <fcntl.h>
  35 #include <sys/un.h>
  36 #include <netinet/tcp.h>
  37 #ifdef TIME_WITH_SYS_TIME
  38 # include <sys/time.h>
  39 # include <time.h>
  40 #else
  41 # ifdef HAVE_SYS_TIME_H
  42 #  include <sys/time.h>
  43 # else
  44 #  include <time.h>
  45 # endif
  46 #endif
  47
  48 /* Define this here, which will turn on the visibilty controls while we're
  49  * building libmemcached.
  50  */
  51 #define BUILDING_LIBMEMCACHED 1
  52
  53
  54 #include "libmemcached/memcached.h"
  55 #include "libmemcached/watchpoint.h"
  56
  57 typedef struct memcached_server_st memcached_server_instance_st;
  58
  59 /* These are private not to be installed headers */
  60 #include "libmemcached/io.h"
  61 #include "libmemcached/internal.h"
  62 #include "libmemcached/libmemcached_probes.h"
  63 #include "libmemcached/memcached/protocol_binary.h"
  64 #include "libmemcached/byteorder.h"
  65 #include "libmemcached/response.h"
  66
  67 /* string value */
  68 struct memcached_continuum_item_st
  69 {
  70   uint32_t index;
  71   uint32_t value;
  72 };
  73
  74 /* Yum, Fortran.... can you make the reference? */
  75 typedef enum {
  76   MEM_NOT= -1,
  77   MEM_FALSE= false,
  78   MEM_TRUE= true,
  79 } memcached_ternary_t;
  80
  81
  82 #if !defined(__GNUC__) || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
  83
  84 #define likely(x)       if((x))
  85 #define unlikely(x)     if((x))
  86
  87 #else
  88
  89 #define likely(x)       if(__builtin_expect((x) != 0, 1))
  90 #define unlikely(x)     if(__builtin_expect((x) != 0, 0))
  91 #endif
  92
  93 #define MEMCACHED_BLOCK_SIZE 1024
  94 #define MEMCACHED_DEFAULT_COMMAND_SIZE 350
  95 #define SMALL_STRING_LEN 1024
  96 #define HUGE_STRING_LEN 8196
  97
  98 /* Hashing algo */
  99
 100 LIBMEMCACHED_LOCAL
 101 void md5_signature(const unsigned char *key, unsigned int length, unsigned char *result);
 102 LIBMEMCACHED_LOCAL
 103 uint32_t hash_crc32(const char *data,
 104                     size_t data_len);
 105 #ifdef HAVE_HSIEH_HASH
 106 LIBMEMCACHED_LOCAL
 107 uint32_t hsieh_hash(const char *key, size_t key_length);
 108 #endif
 109 LIBMEMCACHED_LOCAL
 110 uint32_t murmur_hash(const char *key, size_t key_length);
 111 LIBMEMCACHED_LOCAL
 112 uint32_t jenkins_hash(const void *key, size_t length, uint32_t initval);
 113
 114 LIBMEMCACHED_LOCAL
 115 memcached_return_t memcached_connect(memcached_server_instance_st *ptr);
 116 LIBMEMCACHED_LOCAL
 117 void memcached_quit_server(memcached_server_instance_st *ptr, uint8_t io_death);
 118
 119 #define memcached_server_response_increment(A) (A)->cursor_active++
 120 #define memcached_server_response_decrement(A) (A)->cursor_active--
 121 #define memcached_server_response_reset(A) (A)->cursor_active=0
 122
 123 LIBMEMCACHED_LOCAL
 124 memcached_return_t memcached_do(memcached_server_instance_st *ptr, const void *commmand,
 125                                 size_t command_length, uint8_t with_flush);
 126 LIBMEMCACHED_LOCAL
 127 memcached_return_t value_fetch(memcached_server_instance_st *ptr,
 128                                char *buffer,
 129                                memcached_result_st *result);
 130 LIBMEMCACHED_LOCAL
 131 void server_list_free(memcached_st *ptr, memcached_server_instance_st *servers);
 132
 133 LIBMEMCACHED_LOCAL
 134 memcached_return_t memcached_key_test(const char * const *keys,
 135                                       const size_t *key_length,
 136                                       size_t number_of_keys);
 137
 138
 139 LIBMEMCACHED_LOCAL
 140 uint32_t generate_hash(memcached_st *ptr, const char *key, size_t key_length);
 141
 142 LIBMEMCACHED_LOCAL
 143 memcached_return_t memcached_purge(memcached_server_instance_st *ptr);
 144
 145 static inline memcached_return_t memcached_validate_key_length(size_t key_length, bool binary)
 146 {
 147   unlikely (key_length == 0)
 148     return MEMCACHED_BAD_KEY_PROVIDED;
 149
 150   if (binary)
 151   {
 152     unlikely (key_length > 0xffff)
 153       return MEMCACHED_BAD_KEY_PROVIDED;
 154   }
 155   else
 156   {
 157     unlikely (key_length >= MEMCACHED_MAX_KEY)
 158       return MEMCACHED_BAD_KEY_PROVIDED;
 159   }
 160
 161   return MEMCACHED_SUCCESS;
 162 }
 163
 164 #ifdef TCP_CORK
 165   #define CORK TCP_CORK
 166 #elif defined TCP_NOPUSH
 167   #define CORK TCP_NOPUSH
 168 #endif
 169
 170 /*
 171   test_cork() tries to enable TCP_CORK. IF TCP_CORK is not an option
 172   on the system it returns false but sets errno to 0. Otherwise on
 173   failure errno is set.
 174 */
 175 static inline memcached_ternary_t test_cork(memcached_server_st *ptr, bool enable)
 176 {
 177 #ifdef CORK
 178   if (ptr->type != MEMCACHED_CONNECTION_TCP)
 179     return MEM_FALSE;
 180
 181   int err= setsockopt(ptr->fd, IPPROTO_TCP, CORK,
 182                       &enable, (socklen_t)sizeof(int));
 183   if (! err)
 184   {
 185     return MEM_TRUE;
 186   }
 187
 188   perror(strerror(errno));
 189   ptr->cached_errno= errno;
 190
 191   return MEM_FALSE;
 192 #else
 193   (void)ptr;
 194   (void)enable;
 195
 196   ptr->cached_errno= 0;
 197
 198   return MEM_NOT;
 199 #endif
 200 }
 201
 202 #endif /* LIBMEMCACHED_COMMON_H */