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
  37     /* bind any port number */
  38     localAddr.sin_family = AF_INET;
  39     localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
  40     localAddr.sin_port = htons(0);
  41
  42     /* For the moment, not getting a nonblocking mode will note be fatal */
  43     if (ptr->flags & MEM_NO_BLOCK)
  44     {
  45       int flags;
  46
  47       flags= fcntl(ptr->hosts[server_key].fd, F_GETFL, 0);
  48       if (flags != -1)
  49         (void)fcntl(ptr->hosts[server_key].fd, F_SETFL, flags | O_NONBLOCK);
  50     }
  51
  52     if (ptr->flags & MEM_TCP_NODELAY)
  53     {
  54       int flag= 1;
  55
  56       setsockopt(ptr->hosts[server_key].fd, IPPROTO_TCP, TCP_NODELAY,
  57                  &flag, (socklen_t)sizeof(int));
  58     }
  59
  60     /* connect to server */
  61 test_connect:
  62     if (connect(ptr->hosts[server_key].fd, (struct sockaddr *) &servAddr, sizeof(servAddr)) < 0)
  63     {
  64       switch (errno) {
  65         /* We are spinning waiting on connect */
  66       case EALREADY:
  67       case EINPROGRESS:
  68       case EINTR:
  69         goto test_connect;
  70       case EISCONN: /* We were spinning waiting on connect */
  71         break;
  72       default:
  73         ptr->my_errno= errno;
  74         return MEMCACHED_ERRNO;
  75       }
  76       ptr->connected++;
  77     }
  78     assert(ptr->hosts[server_key].stack_responses == 0);
  79   }
  80
  81   return MEMCACHED_SUCCESS;
  82 }
  83
  84
  85 memcached_return memcached_connect(memcached_st *ptr, unsigned int server_key)
  86 {
  87   memcached_return rc;
  88   LIBMEMCACHED_MEMCACHED_CONNECT_START();
  89
  90   if (ptr->connected == ptr->number_of_hosts)
  91     return MEMCACHED_SUCCESS;
  92
  93   if (!ptr->hosts)
  94     return MEMCACHED_NO_SERVERS;
  95
  96   /* We need to clean up the multi startup piece */
  97   if (server_key)
  98     rc= memcached_real_connect(ptr, server_key);
  99   else
 100   {
 101     unsigned int x;
 102
 103     for (x= 0; x < ptr->number_of_hosts; x++)
 104       rc= memcached_real_connect(ptr, x);
 105   }
 106   LIBMEMCACHED_MEMCACHED_CONNECT_END();
 107
 108   return rc;
 109 }