1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
5 * Copyright (C) 2011 Data Differential, http://datadifferential.com/
6 * Copyright (C) 2006-2009 Brian Aker
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are
13 * * Redistributions of source code must retain the above copyright
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
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 #include <libmemcached/common.h>
42 enum memc_read_or_write
{
48 * The udp request id consists of two seperate sections
50 * 2) The message number
51 * The thread id should only be set when the memcached_st struct is created
52 * and should not be changed.
54 * The message num is incremented for each new message we send, this function
55 * extracts the message number from message_id, increments it and then
56 * writes the new value back into the header
58 static void increment_udp_message_id(memcached_server_write_instance_st ptr
)
60 struct udp_datagram_header_st
*header
= (struct udp_datagram_header_st
*)ptr
->write_buffer
;
61 uint16_t cur_req
= get_udp_datagram_request_id(header
);
62 int msg_num
= get_msg_num_from_request_id(cur_req
);
63 int thread_id
= get_thread_id_from_request_id(cur_req
);
65 if (((++msg_num
) & UDP_REQUEST_ID_THREAD_MASK
) != 0)
68 header
->request_id
= htons((uint16_t) (thread_id
| msg_num
));
72 * Try to fill the input buffer for a server with as much
75 * @param ptr the server to pack
77 static bool repack_input_buffer(memcached_server_write_instance_st ptr
)
79 if (ptr
->read_ptr
!= ptr
->read_buffer
)
81 /* Move all of the data to the beginning of the buffer so
82 ** that we can fit more data into the buffer...
84 memmove(ptr
->read_buffer
, ptr
->read_ptr
, ptr
->read_buffer_length
);
85 ptr
->read_ptr
= ptr
->read_buffer
;
86 ptr
->read_data_length
= ptr
->read_buffer_length
;
89 /* There is room in the buffer, try to fill it! */
90 if (ptr
->read_buffer_length
!= MEMCACHED_MAX_BUFFER
)
93 /* Just try a single read to grab what's available */
94 ssize_t nr
= recv(ptr
->fd
,
95 ptr
->read_ptr
+ ptr
->read_data_length
,
96 MEMCACHED_MAX_BUFFER
- ptr
->read_data_length
,
103 switch (get_socket_errno())
112 #ifdef TARGET_OS_LINUX
115 break; // No IO is fine, we can just move on
118 memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
123 case 0: // Shutdown on the socket has occurred
125 memcached_set_error(*ptr
, MEMCACHED_CONNECTION_FAILURE
, MEMCACHED_AT
);
131 ptr
->read_data_length
+= size_t(nr
);
132 ptr
->read_buffer_length
+= size_t(nr
);
143 * If the we have callbacks connected to this server structure
144 * we may start process the input queue and fire the callbacks
145 * for the incomming messages. This function is _only_ called
146 * when the input buffer is full, so that we _know_ that we have
147 * at least _one_ message to process.
149 * @param ptr the server to star processing iput messages for
150 * @return true if we processed anything, false otherwise
152 static bool process_input_buffer(memcached_server_write_instance_st ptr
)
155 ** We might be able to process some of the response messages if we
156 ** have a callback set up
158 if (ptr
->root
->callbacks
!= NULL
&& ptr
->root
->flags
.use_udp
== false)
161 * We might have responses... try to read them out and fire
164 memcached_callback_st cb
= *ptr
->root
->callbacks
;
166 memcached_set_processing_input((memcached_st
*)ptr
->root
, true);
168 char buffer
[MEMCACHED_DEFAULT_COMMAND_SIZE
];
169 memcached_return_t error
;
170 memcached_st
*root
= (memcached_st
*)ptr
->root
;
171 error
= memcached_response(ptr
, buffer
, sizeof(buffer
),
174 memcached_set_processing_input(root
, false);
176 if (error
== MEMCACHED_SUCCESS
)
178 for (unsigned int x
= 0; x
< cb
.number_of_callback
; x
++)
180 error
= (*cb
.callback
[x
])(ptr
->root
, &root
->result
, cb
.context
);
181 if (error
!= MEMCACHED_SUCCESS
)
185 /* @todo what should I do with the error message??? */
187 /* @todo what should I do with other error messages?? */
194 static memcached_return_t
io_wait(memcached_server_write_instance_st ptr
,
195 memc_read_or_write read_or_write
)
201 if (read_or_write
== MEM_WRITE
) /* write */
204 WATCHPOINT_SET(ptr
->io_wait_count
.write
++);
208 WATCHPOINT_SET(ptr
->io_wait_count
.read
++);
212 ** We are going to block on write, but at least on Solaris we might block
213 ** on write if we haven't read anything from our input buffer..
214 ** Try to purge the input buffer if we don't do any flow control in the
215 ** application layer (just sending a lot of data etc)
216 ** The test is moved down in the purge function to avoid duplication of
219 if (read_or_write
== MEM_WRITE
)
221 memcached_return_t rc
= memcached_purge(ptr
);
222 if (rc
!= MEMCACHED_SUCCESS
&& rc
!= MEMCACHED_STORED
)
224 return MEMCACHED_FAILURE
;
228 if (ptr
->root
->poll_timeout
== 0) // Mimic 0 causes timeout behavior (not all platforms do this)
230 return memcached_set_error(*ptr
, MEMCACHED_TIMEOUT
, MEMCACHED_AT
);
234 while (--loop_max
) // While loop is for ERESTART or EINTR
237 int error
= poll(&fds
, 1, ptr
->root
->poll_timeout
);
241 WATCHPOINT_IF_LABELED_NUMBER(read_or_write
&& loop_max
< 4, "read() times we had to loop, decremented down from 5", loop_max
);
242 WATCHPOINT_IF_LABELED_NUMBER(!read_or_write
&& loop_max
< 4, "write() times we had to loop, decremented down from 5", loop_max
);
244 return MEMCACHED_SUCCESS
;
246 case 0: // Timeout occured, we let the while() loop do its thing.
247 return memcached_set_error(*ptr
, MEMCACHED_TIMEOUT
, MEMCACHED_AT
);
250 WATCHPOINT_ERRNO(get_socket_errno());
251 switch (get_socket_errno())
253 #ifdef TARGET_OS_LINUX
261 return memcached_set_error(*ptr
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
);
264 return memcached_set_error(*ptr
, MEMCACHED_MEMORY_ALLOCATION_FAILURE
, MEMCACHED_AT
, memcached_literal_param("RLIMIT_NOFILE exceeded, or if OSX the timeout value was invalid"));
267 if (fds
.revents
& POLLERR
)
270 socklen_t len
= sizeof (err
);
271 if (getsockopt(ptr
->fd
, SOL_SOCKET
, SO_ERROR
, &err
, &len
) == 0)
282 memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
284 int local_errno
= get_socket_errno(); // We cache in case memcached_quit_server() modifies errno
285 memcached_quit_server(ptr
, true);
287 return memcached_set_errno(*ptr
, local_errno
, MEMCACHED_AT
);
292 memcached_quit_server(ptr
, true);
294 return memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
297 static ssize_t
io_flush(memcached_server_write_instance_st ptr
,
298 const bool with_flush
,
299 memcached_return_t
*error
)
302 ** We might want to purge the input buffer if we haven't consumed
303 ** any output yet... The test for the limits is the purge is inline
304 ** in the purge function to avoid duplicating the logic..
307 memcached_return_t rc
;
308 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
309 rc
= memcached_purge(ptr
);
311 if (rc
!= MEMCACHED_SUCCESS
&& rc
!= MEMCACHED_STORED
)
316 size_t return_length
;
317 char *local_write_ptr
= ptr
->write_buffer
;
318 size_t write_length
= ptr
->write_buffer_offset
;
320 *error
= MEMCACHED_SUCCESS
;
322 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
324 // UDP Sanity check, make sure that we are not sending somthing too big
325 if (memcached_is_udp(ptr
->root
) and write_length
> MAX_UDP_DATAGRAM_LENGTH
)
327 *error
= MEMCACHED_WRITE_FAILURE
;
331 if (ptr
->write_buffer_offset
== 0 or (memcached_is_udp(ptr
->root
) and ptr
->write_buffer_offset
== UDP_DATAGRAM_HEADER_LENGTH
))
336 /* Looking for memory overflows */
338 if (write_length
== MEMCACHED_MAX_BUFFER
)
339 WATCHPOINT_ASSERT(ptr
->write_buffer
== local_write_ptr
);
340 WATCHPOINT_ASSERT((ptr
->write_buffer
+ MEMCACHED_MAX_BUFFER
) >= (local_write_ptr
+ write_length
));
346 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
347 WATCHPOINT_ASSERT(write_length
> 0);
348 if (memcached_is_udp(ptr
->root
))
350 increment_udp_message_id(ptr
);
353 ssize_t sent_length
= 0;
354 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
357 sent_length
= send(ptr
->fd
, local_write_ptr
, write_length
, MSG_NOSIGNAL
|MSG_DONTWAIT
);
361 sent_length
= send(ptr
->fd
, local_write_ptr
, write_length
, MSG_NOSIGNAL
|MSG_DONTWAIT
|MSG_MORE
);
364 if (sent_length
== SOCKET_ERROR
)
366 memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
367 #if 0 // @todo I should look at why we hit this bit of code hard frequently
368 WATCHPOINT_ERRNO(get_socket_errno());
369 WATCHPOINT_NUMBER(get_socket_errno());
371 switch (get_socket_errno())
381 * We may be blocked on write because the input buffer
382 * is full. Let's check if we have room in our input
383 * buffer for more data and retry the write before
386 if (repack_input_buffer(ptr
) or process_input_buffer(ptr
))
391 memcached_return_t rc
= io_wait(ptr
, MEM_WRITE
);
392 if (memcached_success(rc
))
396 else if (rc
== MEMCACHED_TIMEOUT
)
398 *error
= memcached_set_error(*ptr
, MEMCACHED_TIMEOUT
, MEMCACHED_AT
);
402 memcached_quit_server(ptr
, true);
403 *error
= memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
409 memcached_quit_server(ptr
, true);
410 *error
= memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
411 WATCHPOINT_ASSERT(ptr
->fd
== -1);
416 if (memcached_is_udp(ptr
->root
) and size_t(sent_length
) != write_length
)
418 memcached_quit_server(ptr
, true);
419 *error
= memcached_set_error(*ptr
, MEMCACHED_WRITE_FAILURE
, MEMCACHED_AT
);
423 ptr
->io_bytes_sent
+= uint32_t(sent_length
);
425 local_write_ptr
+= sent_length
;
426 write_length
-= uint32_t(sent_length
);
427 return_length
+= uint32_t(sent_length
);
430 WATCHPOINT_ASSERT(write_length
== 0);
431 // Need to study this assert() WATCHPOINT_ASSERT(return_length ==
432 // ptr->write_buffer_offset);
434 // if we are a udp server, the begining of the buffer is reserverd for
435 // the upd frame header
436 if (memcached_is_udp(ptr
->root
))
438 ptr
->write_buffer_offset
= UDP_DATAGRAM_HEADER_LENGTH
;
442 ptr
->write_buffer_offset
= 0;
445 return (ssize_t
) return_length
;
448 memcached_return_t
memcached_io_wait_for_write(memcached_server_write_instance_st ptr
)
450 return io_wait(ptr
, MEM_WRITE
);
453 memcached_return_t
memcached_io_read(memcached_server_write_instance_st ptr
,
454 void *buffer
, size_t length
, ssize_t
*nread
)
456 assert_msg(ptr
, "Programmer error, memcached_io_read() recieved an invalid memcached_server_write_instance_st"); // Programmer error
457 char *buffer_ptr
= static_cast<char *>(buffer
);
459 if (ptr
->fd
== INVALID_SOCKET
)
461 assert_msg(int(ptr
->state
) <= int(MEMCACHED_SERVER_STATE_ADDRINFO
), "Programmer error, invalid socket state");
462 return MEMCACHED_CONNECTION_FAILURE
;
467 if (not ptr
->read_buffer_length
)
472 data_read
= recv(ptr
->fd
, ptr
->read_buffer
, MEMCACHED_MAX_BUFFER
, MSG_DONTWAIT
);
473 if (data_read
== SOCKET_ERROR
)
475 switch (get_socket_errno())
477 case EINTR
: // We just retry
480 case ETIMEDOUT
: // OSX
485 #ifdef TARGET_OS_LINUX
488 if (memcached_success(io_wait(ptr
, MEM_READ
)))
492 return MEMCACHED_IN_PROGRESS
;
496 case ENOTCONN
: // Programmer Error
497 WATCHPOINT_ASSERT(0);
499 WATCHPOINT_ASSERT(0);
501 assert_msg(ptr
->fd
!= INVALID_SOCKET
, "Programmer error, invalid socket");
507 memcached_quit_server(ptr
, true);
509 return memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
513 else if (data_read
== 0)
516 EOF. Any data received so far is incomplete
517 so discard it. This always reads by byte in case of TCP
518 and protocol enforcement happens at memcached_response()
519 looking for '\n'. We do not care for UDB which requests 8 bytes
520 at once. Generally, this means that connection went away. Since
521 for blocking I/O we do not return 0 and for non-blocking case
522 it will return EGAIN if data is not immediatly available.
524 WATCHPOINT_STRING("We had a zero length recv()");
525 memcached_quit_server(ptr
, true);
527 return memcached_set_error(*ptr
, MEMCACHED_UNKNOWN_READ_FAILURE
, MEMCACHED_AT
);
529 } while (data_read
<= 0);
531 ptr
->io_bytes_sent
= 0;
532 ptr
->read_data_length
= (size_t) data_read
;
533 ptr
->read_buffer_length
= (size_t) data_read
;
534 ptr
->read_ptr
= ptr
->read_buffer
;
541 difference
= (length
> ptr
->read_buffer_length
) ? ptr
->read_buffer_length
: length
;
543 memcpy(buffer_ptr
, ptr
->read_ptr
, difference
);
544 length
-= difference
;
545 ptr
->read_ptr
+= difference
;
546 ptr
->read_buffer_length
-= difference
;
547 buffer_ptr
+= difference
;
551 *buffer_ptr
= *ptr
->read_ptr
;
553 ptr
->read_buffer_length
--;
559 *nread
= (ssize_t
)(buffer_ptr
- (char*)buffer
);
561 return MEMCACHED_SUCCESS
;
564 memcached_return_t
memcached_io_slurp(memcached_server_write_instance_st ptr
)
566 assert_msg(ptr
, "Programmer error, invalid memcached_server_write_instance_st");
568 if (ptr
->fd
== INVALID_SOCKET
)
570 assert_msg(int(ptr
->state
) <= int(MEMCACHED_SERVER_STATE_ADDRINFO
), "Invalid socket state");
571 return MEMCACHED_CONNECTION_FAILURE
;
575 char buffer
[MEMCACHED_MAX_BUFFER
];
578 data_read
= recv(ptr
->fd
, ptr
->read_buffer
, sizeof(buffer
), MSG_DONTWAIT
);
579 if (data_read
== SOCKET_ERROR
)
581 switch (get_socket_errno())
583 case EINTR
: // We just retry
586 case ETIMEDOUT
: // OSX
591 #ifdef TARGET_OS_LINUX
594 if (memcached_success(io_wait(ptr
, MEM_READ
)))
598 return MEMCACHED_IN_PROGRESS
;
602 case ENOTCONN
: // Programmer Error
603 WATCHPOINT_ASSERT(0);
605 WATCHPOINT_ASSERT(0);
607 assert_msg(ptr
->fd
!= INVALID_SOCKET
, "Invalid socket state");
612 return MEMCACHED_CONNECTION_FAILURE
; // We want this!
615 } while (data_read
> 0);
617 return MEMCACHED_CONNECTION_FAILURE
;
620 static ssize_t
_io_write(memcached_server_write_instance_st ptr
,
621 const void *buffer
, size_t length
, bool with_flush
)
623 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
625 size_t original_length
= length
;
626 const char *buffer_ptr
= static_cast<const char *>(buffer
);
634 if (memcached_is_udp(ptr
->root
))
636 //UDP does not support partial writes
637 buffer_end
= MAX_UDP_DATAGRAM_LENGTH
;
638 should_write
= length
;
639 if (ptr
->write_buffer_offset
+ should_write
> buffer_end
)
646 buffer_end
= MEMCACHED_MAX_BUFFER
;
647 should_write
= buffer_end
- ptr
->write_buffer_offset
;
648 should_write
= (should_write
< length
) ? should_write
: length
;
651 write_ptr
= ptr
->write_buffer
+ ptr
->write_buffer_offset
;
652 memcpy(write_ptr
, buffer_ptr
, should_write
);
653 ptr
->write_buffer_offset
+= should_write
;
654 buffer_ptr
+= should_write
;
655 length
-= should_write
;
657 if (ptr
->write_buffer_offset
== buffer_end
and memcached_is_udp(ptr
->root
) == false)
659 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
661 memcached_return_t rc
;
662 ssize_t sent_length
= io_flush(ptr
, with_flush
, &rc
);
663 if (sent_length
== -1)
668 /* If io_flush calls memcached_purge, sent_length may be 0 */
669 unlikely (sent_length
!= 0)
671 WATCHPOINT_ASSERT(sent_length
== (ssize_t
)buffer_end
);
678 memcached_return_t rc
;
679 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
680 if (io_flush(ptr
, with_flush
, &rc
) == -1)
686 return (ssize_t
) original_length
;
689 ssize_t
memcached_io_write(memcached_server_write_instance_st ptr
,
690 const void *buffer
, size_t length
, bool with_flush
)
692 return _io_write(ptr
, buffer
, length
, with_flush
);
695 ssize_t
memcached_io_writev(memcached_server_write_instance_st ptr
,
696 const struct libmemcached_io_vector_st
*vector
,
697 size_t number_of
, bool with_flush
)
701 for (size_t x
= 0; x
< number_of
; x
++, vector
++)
705 if ((returnable
= _io_write(ptr
, vector
->buffer
, vector
->length
, false)) == -1)
714 if (memcached_io_write(ptr
, NULL
, 0, true) == -1)
724 void memcached_io_close(memcached_server_write_instance_st ptr
)
726 if (ptr
->fd
== INVALID_SOCKET
)
731 /* in case of death shutdown to avoid blocking at close() */
732 if (shutdown(ptr
->fd
, SHUT_RDWR
) == SOCKET_ERROR
&& get_socket_errno() != ENOTCONN
)
734 WATCHPOINT_NUMBER(ptr
->fd
);
735 WATCHPOINT_ERRNO(get_socket_errno());
736 WATCHPOINT_ASSERT(get_socket_errno());
739 if (closesocket(ptr
->fd
) == SOCKET_ERROR
)
741 WATCHPOINT_ERRNO(get_socket_errno());
743 ptr
->state
= MEMCACHED_SERVER_STATE_NEW
;
744 ptr
->fd
= INVALID_SOCKET
;
747 memcached_server_write_instance_st
memcached_io_get_readable_server(memcached_st
*memc
)
749 #define MAX_SERVERS_TO_POLL 100
750 struct pollfd fds
[MAX_SERVERS_TO_POLL
];
751 unsigned int host_index
= 0;
753 for (uint32_t x
= 0; x
< memcached_server_count(memc
) && host_index
< MAX_SERVERS_TO_POLL
; ++x
)
755 memcached_server_write_instance_st instance
=
756 memcached_server_instance_fetch(memc
, x
);
758 if (instance
->read_buffer_length
> 0) /* I have data in the buffer */
761 if (memcached_server_response_count(instance
) > 0)
763 fds
[host_index
].events
= POLLIN
;
764 fds
[host_index
].revents
= 0;
765 fds
[host_index
].fd
= instance
->fd
;
772 /* We have 0 or 1 server with pending events.. */
773 for (uint32_t x
= 0; x
< memcached_server_count(memc
); ++x
)
775 memcached_server_write_instance_st instance
=
776 memcached_server_instance_fetch(memc
, x
);
778 if (memcached_server_response_count(instance
) > 0)
787 int error
= poll(fds
, host_index
, memc
->poll_timeout
);
791 memcached_set_errno(*memc
, get_socket_errno(), MEMCACHED_AT
);
797 for (size_t x
= 0; x
< host_index
; ++x
)
799 if (fds
[x
].revents
& POLLIN
)
801 for (uint32_t y
= 0; y
< memcached_server_count(memc
); ++y
)
803 memcached_server_write_instance_st instance
=
804 memcached_server_instance_fetch(memc
, y
);
806 if (instance
->fd
== fds
[x
].fd
)
817 Eventually we will just kill off the server with the problem.
819 void memcached_io_reset(memcached_server_write_instance_st ptr
)
821 memcached_quit_server(ptr
, true);
825 * Read a given number of bytes from the server and place it into a specific
826 * buffer. Reset the IO channel on this server if an error occurs.
828 memcached_return_t
memcached_safe_read(memcached_server_write_instance_st ptr
,
833 char *data
= static_cast<char *>(dta
);
835 while (offset
< size
)
838 memcached_return_t rc
;
840 while (memcached_continue(rc
= memcached_io_read(ptr
, data
+ offset
, size
- offset
, &nread
))) { };
842 if (memcached_failed(rc
))
847 offset
+= (size_t) nread
;
850 return MEMCACHED_SUCCESS
;
853 memcached_return_t
memcached_io_readline(memcached_server_write_instance_st ptr
,
859 bool line_complete
= false;
861 while (not line_complete
)
863 if (ptr
->read_buffer_length
== 0)
866 * We don't have any data in the buffer, so let's fill the read
867 * buffer. Call the standard read function to avoid duplicating
871 memcached_return_t rc
= memcached_io_read(ptr
, buffer_ptr
, 1, &nread
);
872 if (memcached_failed(rc
) and rc
== MEMCACHED_IN_PROGRESS
)
874 memcached_quit_server(ptr
, true);
875 return memcached_set_error(*ptr
, rc
, MEMCACHED_AT
);
877 else if (memcached_failed(rc
))
882 if (*buffer_ptr
== '\n')
889 /* Now let's look in the buffer and copy as we go! */
890 while (ptr
->read_buffer_length
&& total_nr
< size
&& !line_complete
)
892 *buffer_ptr
= *ptr
->read_ptr
;
893 if (*buffer_ptr
== '\n')
894 line_complete
= true;
895 --ptr
->read_buffer_length
;
901 if (total_nr
== size
)
902 return MEMCACHED_PROTOCOL_ERROR
;
905 return MEMCACHED_SUCCESS
;
908 memcached_return_t
memcached_io_init_udp_header(memcached_server_write_instance_st ptr
, uint16_t thread_id
)
910 if (thread_id
> UDP_REQUEST_ID_MAX_THREAD_ID
)
911 return MEMCACHED_FAILURE
;
913 struct udp_datagram_header_st
*header
= (struct udp_datagram_header_st
*)ptr
->write_buffer
;
914 header
->request_id
= htons((uint16_t) (generate_udp_request_thread_id(thread_id
)));
915 header
->num_datagrams
= htons(1);
916 header
->sequence_number
= htons(0);
918 return MEMCACHED_SUCCESS
;