+ struct pollfd fds[1];
+ short flags= 0;
+ int error;
+ int latch= 0;
+
+ if (read_or_write)
+ flags= POLLOUT | POLLERR;
+ else
+ flags= POLLIN | POLLERR;
+
+ memset(&fds, 0, sizeof(struct pollfd));
+ fds[0].fd= ptr->hosts[server_key].fd;
+ fds[0].events= flags;
+
+ while (latch == 0)
+ {
+ error= poll(fds, 1, ptr->poll_timeout);
+
+ if (error == 1)
+ return MEMCACHED_SUCCESS;
+ else if (error == -1)
+ {
+ memcached_quit_server(ptr, server_key, 1);
+ return MEMCACHED_FAILURE;
+ }
+ else if (error)
+ {
+ /* This is impossible */
+ WATCHPOINT_ASSERT(0);
+ return MEMCACHED_FAILURE;
+ }
+ else
+ latch++;
+ }
+
+ memcached_quit_server(ptr, server_key, 1);
+
+ return MEMCACHED_FAILURE; /* Timeout occurred */
+}
+
+ssize_t memcached_io_read(memcached_st *ptr, unsigned int server_key,
+ char *buffer, size_t length)
+{
+ char *buffer_ptr;
+
+ buffer_ptr= buffer;
+
+ while (length)
+ {
+ if (!ptr->hosts[server_key].read_buffer_length)
+ {
+ size_t data_read;
+
+ while (1)
+ {
+ if (ptr->flags & MEM_NO_BLOCK)
+ {
+ memcached_return rc;
+
+ rc= io_wait(ptr, server_key, 0);
+ if (rc != MEMCACHED_SUCCESS)
+ return -1;
+ }
+
+ data_read= read(ptr->hosts[server_key].fd,
+ ptr->hosts[server_key].read_buffer,
+ MEMCACHED_MAX_BUFFER);
+ if (data_read == -1)
+ {
+ switch (errno)
+ {
+ case EAGAIN:
+ break;
+ default:
+ {
+ memcached_quit_server(ptr, server_key, 1);
+ ptr->cached_errno= errno;
+ return -1;
+ }
+ }
+ }
+ else if (data_read)
+ break;
+ /* If zero, just keep looping */
+ }
+
+ ptr->hosts[server_key].read_buffer_length= data_read;
+ ptr->hosts[server_key].read_ptr= ptr->hosts[server_key].read_buffer;
+ }
+
+ *buffer_ptr= *ptr->hosts[server_key].read_ptr;
+ length--;
+ ptr->hosts[server_key].read_ptr++;
+ ptr->hosts[server_key].read_buffer_length--;
+ buffer_ptr++;
+ }
+
+ return (size_t)(buffer_ptr - buffer);