git.m6w6.name Git - awesomized/libmemcached/blob - lib/memcached_connect.c

   1 #include "common.h"
   2
   3 #include <fcntl.h>
   4 #include <sys/types.h>
   5 #include <sys/socket.h>
   6 #include <netinet/tcp.h>
   7 #include <netdb.h>
   8
   9 memcached_return memcached_real_connect(memcached_st *ptr, unsigned int server_key)
  10 {
  11   struct sockaddr_in localAddr, servAddr;
  12   struct hostent *h;
  13
  14   if (ptr->hosts[server_key].fd == -1)
  15   {
  16     /* Old connection junk still is in the structure */
  17     assert(ptr->hosts[server_key].stack_responses == 0);
  18
  19     if ((h= gethostbyname(ptr->hosts[server_key].hostname)) == NULL)
  20     {
  21       ptr->my_errno= h_errno;
  22       return MEMCACHED_HOST_LOCKUP_FAILURE;
  23     }
  24
  25     servAddr.sin_family= h->h_addrtype;
  26     memcpy((char *) &servAddr.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
  27     servAddr.sin_port = htons(ptr->hosts[server_key].port);
  28
  29     /* Create the socket */
  30     if ((ptr->hosts[server_key].fd= socket(AF_INET, SOCK_STREAM, 0)) < 0)
  31     {
  32       ptr->my_errno= errno;
  33       return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
  34     }
  35
  36     /* bind any port number */
  37     localAddr.sin_family = AF_INET;
  38     localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
  39     localAddr.sin_port = htons(0);
  40
  41     /* For the moment, not getting a nonblocking mode will note be fatal */
  42     if (ptr->flags & MEM_NO_BLOCK)
  43     {
  44       int flags;
  45
  46       flags= fcntl(ptr->hosts[server_key].fd, F_GETFL, 0);
  47       if (flags != -1)
  48         (void)fcntl(ptr->hosts[server_key].fd, F_SETFL, flags | O_NONBLOCK);
  49     }
  50
  51     if (ptr->flags & MEM_TCP_NODELAY)
  52     {
  53       int flag= 1;
  54
  55       setsockopt(ptr->hosts[server_key].fd, IPPROTO_TCP, TCP_NODELAY,
  56                  &flag, (socklen_t)sizeof(int));
  57     }
  58
  59     if (ptr->send_size)
  60     {
  61       setsockopt(ptr->hosts[server_key].fd, SOL_SOCKET, SO_SNDBUF,
  62                  &ptr->send_size, (socklen_t)sizeof(int));
  63     }
  64
  65     if (ptr->recv_size)
  66     {
  67       setsockopt(ptr->hosts[server_key].fd, SOL_SOCKET, SO_SNDBUF,
  68                  &ptr->recv_size, (socklen_t)sizeof(int));
  69     }
  70
  71     /* connect to server */
  72 test_connect:
  73     if (connect(ptr->hosts[server_key].fd, (struct sockaddr *) &servAddr, sizeof(servAddr)) < 0)
  74     {
  75       switch (errno) {
  76         /* We are spinning waiting on connect */
  77       case EALREADY:
  78       case EINPROGRESS:
  79       case EINTR:
  80         goto test_connect;
  81       case EISCONN: /* We were spinning waiting on connect */
  82         break;
  83       default:
  84         ptr->my_errno= errno;
  85         return MEMCACHED_ERRNO;
  86       }
  87       ptr->connected++;
  88     }
  89     assert(ptr->hosts[server_key].stack_responses == 0);
  90   }
  91
  92   return MEMCACHED_SUCCESS;
  93 }
  94
  95
  96 memcached_return memcached_connect(memcached_st *ptr, unsigned int server_key)
  97 {
  98   memcached_return rc;
  99   LIBMEMCACHED_MEMCACHED_CONNECT_START();
 100
 101   if (ptr->connected == ptr->number_of_hosts)
 102     return MEMCACHED_SUCCESS;
 103
 104   if (!ptr->hosts)
 105     return MEMCACHED_NO_SERVERS;
 106
 107   /* We need to clean up the multi startup piece */
 108   if (server_key)
 109     rc= memcached_real_connect(ptr, server_key);
 110   else
 111   {
 112     unsigned int x;
 113
 114     for (x= 0; x < ptr->number_of_hosts; x++)
 115       rc= memcached_real_connect(ptr, x);
 116   }
 117   LIBMEMCACHED_MEMCACHED_CONNECT_END();
 118
 119   return rc;
 120 }