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 bool 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 char *local_write_ptr
= ptr
->write_buffer
;
317 size_t write_length
= ptr
->write_buffer_offset
;
319 error
= MEMCACHED_SUCCESS
;
321 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
323 // UDP Sanity check, make sure that we are not sending somthing too big
324 if (memcached_is_udp(ptr
->root
) and write_length
> MAX_UDP_DATAGRAM_LENGTH
)
326 error
= memcached_set_error(*ptr
, MEMCACHED_WRITE_FAILURE
, MEMCACHED_AT
);
330 if (ptr
->write_buffer_offset
== 0 or (memcached_is_udp(ptr
->root
) and ptr
->write_buffer_offset
== UDP_DATAGRAM_HEADER_LENGTH
))
335 /* Looking for memory overflows */
337 if (write_length
== MEMCACHED_MAX_BUFFER
)
338 WATCHPOINT_ASSERT(ptr
->write_buffer
== local_write_ptr
);
339 WATCHPOINT_ASSERT((ptr
->write_buffer
+ MEMCACHED_MAX_BUFFER
) >= (local_write_ptr
+ write_length
));
344 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
345 WATCHPOINT_ASSERT(write_length
> 0);
346 if (memcached_is_udp(ptr
->root
))
348 increment_udp_message_id(ptr
);
351 ssize_t sent_length
= 0;
352 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
355 sent_length
= ::send(ptr
->fd
, local_write_ptr
, write_length
, MSG_NOSIGNAL
|MSG_DONTWAIT
);
359 sent_length
= ::send(ptr
->fd
, local_write_ptr
, write_length
, MSG_NOSIGNAL
|MSG_DONTWAIT
|MSG_MORE
);
362 if (sent_length
== SOCKET_ERROR
)
364 memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
365 #if 0 // @todo I should look at why we hit this bit of code hard frequently
366 WATCHPOINT_ERRNO(get_socket_errno());
367 WATCHPOINT_NUMBER(get_socket_errno());
369 switch (get_socket_errno())
379 * We may be blocked on write because the input buffer
380 * is full. Let's check if we have room in our input
381 * buffer for more data and retry the write before
384 if (repack_input_buffer(ptr
) or process_input_buffer(ptr
))
389 memcached_return_t rc
= io_wait(ptr
, MEM_WRITE
);
390 if (memcached_success(rc
))
394 else if (rc
== MEMCACHED_TIMEOUT
)
396 error
= memcached_set_error(*ptr
, MEMCACHED_TIMEOUT
, MEMCACHED_AT
);
400 memcached_quit_server(ptr
, true);
401 error
= memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
407 memcached_quit_server(ptr
, true);
408 error
= memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
409 WATCHPOINT_ASSERT(ptr
->fd
== INVALID_SOCKET
);
414 if (memcached_is_udp(ptr
->root
) and size_t(sent_length
) != write_length
)
416 memcached_quit_server(ptr
, true);
417 error
= memcached_set_error(*ptr
, MEMCACHED_WRITE_FAILURE
, MEMCACHED_AT
);
421 ptr
->io_bytes_sent
+= uint32_t(sent_length
);
423 local_write_ptr
+= sent_length
;
424 write_length
-= uint32_t(sent_length
);
427 WATCHPOINT_ASSERT(write_length
== 0);
428 if (memcached_is_udp(ptr
->root
))
430 ptr
->write_buffer_offset
= UDP_DATAGRAM_HEADER_LENGTH
;
434 ptr
->write_buffer_offset
= 0;
440 memcached_return_t
memcached_io_wait_for_write(memcached_server_write_instance_st ptr
)
442 return io_wait(ptr
, MEM_WRITE
);
445 memcached_return_t
memcached_io_read(memcached_server_write_instance_st ptr
,
446 void *buffer
, size_t length
, ssize_t
*nread
)
448 assert_msg(ptr
, "Programmer error, memcached_io_read() recieved an invalid memcached_server_write_instance_st"); // Programmer error
449 char *buffer_ptr
= static_cast<char *>(buffer
);
451 if (ptr
->fd
== INVALID_SOCKET
)
454 assert_msg(int(ptr
->state
) <= int(MEMCACHED_SERVER_STATE_ADDRINFO
), "Programmer error, invalid socket state");
456 return MEMCACHED_CONNECTION_FAILURE
;
461 if (not ptr
->read_buffer_length
)
466 data_read
= recv(ptr
->fd
, ptr
->read_buffer
, MEMCACHED_MAX_BUFFER
, MSG_DONTWAIT
);
467 if (data_read
== SOCKET_ERROR
)
469 switch (get_socket_errno())
471 case EINTR
: // We just retry
474 case ETIMEDOUT
: // OSX
479 #ifdef TARGET_OS_LINUX
482 if (memcached_success(io_wait(ptr
, MEM_READ
)))
486 return MEMCACHED_IN_PROGRESS
;
490 case ENOTCONN
: // Programmer Error
491 WATCHPOINT_ASSERT(0);
493 WATCHPOINT_ASSERT(0);
495 assert_msg(ptr
->fd
!= INVALID_SOCKET
, "Programmer error, invalid socket");
501 memcached_quit_server(ptr
, true);
503 return memcached_set_errno(*ptr
, get_socket_errno(), MEMCACHED_AT
);
507 else if (data_read
== 0)
510 EOF. Any data received so far is incomplete
511 so discard it. This always reads by byte in case of TCP
512 and protocol enforcement happens at memcached_response()
513 looking for '\n'. We do not care for UDB which requests 8 bytes
514 at once. Generally, this means that connection went away. Since
515 for blocking I/O we do not return 0 and for non-blocking case
516 it will return EGAIN if data is not immediatly available.
518 WATCHPOINT_STRING("We had a zero length recv()");
519 memcached_quit_server(ptr
, true);
521 return memcached_set_error(*ptr
, MEMCACHED_UNKNOWN_READ_FAILURE
, MEMCACHED_AT
);
523 } while (data_read
<= 0);
525 ptr
->io_bytes_sent
= 0;
526 ptr
->read_data_length
= (size_t) data_read
;
527 ptr
->read_buffer_length
= (size_t) data_read
;
528 ptr
->read_ptr
= ptr
->read_buffer
;
535 difference
= (length
> ptr
->read_buffer_length
) ? ptr
->read_buffer_length
: length
;
537 memcpy(buffer_ptr
, ptr
->read_ptr
, difference
);
538 length
-= difference
;
539 ptr
->read_ptr
+= difference
;
540 ptr
->read_buffer_length
-= difference
;
541 buffer_ptr
+= difference
;
545 *buffer_ptr
= *ptr
->read_ptr
;
547 ptr
->read_buffer_length
--;
553 *nread
= (ssize_t
)(buffer_ptr
- (char*)buffer
);
555 return MEMCACHED_SUCCESS
;
558 memcached_return_t
memcached_io_slurp(memcached_server_write_instance_st ptr
)
560 assert_msg(ptr
, "Programmer error, invalid memcached_server_write_instance_st");
562 if (ptr
->fd
== INVALID_SOCKET
)
564 assert_msg(int(ptr
->state
) <= int(MEMCACHED_SERVER_STATE_ADDRINFO
), "Invalid socket state");
565 return MEMCACHED_CONNECTION_FAILURE
;
569 char buffer
[MEMCACHED_MAX_BUFFER
];
572 data_read
= recv(ptr
->fd
, ptr
->read_buffer
, sizeof(buffer
), MSG_DONTWAIT
);
573 if (data_read
== SOCKET_ERROR
)
575 switch (get_socket_errno())
577 case EINTR
: // We just retry
580 case ETIMEDOUT
: // OSX
585 #ifdef TARGET_OS_LINUX
588 if (memcached_success(io_wait(ptr
, MEM_READ
)))
592 return MEMCACHED_IN_PROGRESS
;
596 case ENOTCONN
: // Programmer Error
597 WATCHPOINT_ASSERT(0);
599 WATCHPOINT_ASSERT(0);
601 assert_msg(ptr
->fd
!= INVALID_SOCKET
, "Invalid socket state");
606 return MEMCACHED_CONNECTION_FAILURE
; // We want this!
609 } while (data_read
> 0);
611 return MEMCACHED_CONNECTION_FAILURE
;
614 static ssize_t
_io_write(memcached_server_write_instance_st ptr
,
615 const void *buffer
, size_t length
, bool with_flush
)
617 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
619 size_t original_length
= length
;
620 const char *buffer_ptr
= static_cast<const char *>(buffer
);
628 if (memcached_is_udp(ptr
->root
))
630 //UDP does not support partial writes
631 buffer_end
= MAX_UDP_DATAGRAM_LENGTH
;
632 should_write
= length
;
633 if (ptr
->write_buffer_offset
+ should_write
> buffer_end
)
640 buffer_end
= MEMCACHED_MAX_BUFFER
;
641 should_write
= buffer_end
- ptr
->write_buffer_offset
;
642 should_write
= (should_write
< length
) ? should_write
: length
;
645 write_ptr
= ptr
->write_buffer
+ ptr
->write_buffer_offset
;
646 memcpy(write_ptr
, buffer_ptr
, should_write
);
647 ptr
->write_buffer_offset
+= should_write
;
648 buffer_ptr
+= should_write
;
649 length
-= should_write
;
651 if (ptr
->write_buffer_offset
== buffer_end
and memcached_is_udp(ptr
->root
) == false)
653 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
655 memcached_return_t rc
;
656 if (io_flush(ptr
, with_flush
, rc
) == false)
665 memcached_return_t rc
;
666 WATCHPOINT_ASSERT(ptr
->fd
!= INVALID_SOCKET
);
667 if (io_flush(ptr
, with_flush
, rc
) == false)
673 return (ssize_t
) original_length
;
676 bool memcached_io_write(memcached_server_write_instance_st ptr
)
678 return (_io_write(ptr
, NULL
, 0, true) >= 0);
681 ssize_t
memcached_io_write(memcached_server_write_instance_st ptr
,
682 const void *buffer
, const size_t length
, const bool with_flush
)
684 return _io_write(ptr
, buffer
, length
, with_flush
);
687 size_t io_vector_total_size(libmemcached_io_vector_st
* vector
, const size_t number_of
)
691 for (size_t x
= 0; x
< number_of
; x
++)
693 total
+= vector
->length
;
699 ssize_t
memcached_io_writev(memcached_server_write_instance_st ptr
,
700 const struct libmemcached_io_vector_st
*vector
,
701 size_t number_of
, bool with_flush
)
705 for (size_t x
= 0; x
< number_of
; x
++, vector
++)
711 if ((returnable
= _io_write(ptr
, vector
->buffer
, vector
->length
, false)) == -1)
721 if (memcached_io_write(ptr
) == false)
731 void memcached_io_close(memcached_server_write_instance_st ptr
)
733 if (ptr
->fd
== INVALID_SOCKET
)
738 /* in case of death shutdown to avoid blocking at close() */
739 if (shutdown(ptr
->fd
, SHUT_RDWR
) == SOCKET_ERROR
&& get_socket_errno() != ENOTCONN
)
741 WATCHPOINT_NUMBER(ptr
->fd
);
742 WATCHPOINT_ERRNO(get_socket_errno());
743 WATCHPOINT_ASSERT(get_socket_errno());
746 if (closesocket(ptr
->fd
) == SOCKET_ERROR
)
748 WATCHPOINT_ERRNO(get_socket_errno());
750 ptr
->state
= MEMCACHED_SERVER_STATE_NEW
;
751 ptr
->fd
= INVALID_SOCKET
;
754 memcached_server_write_instance_st
memcached_io_get_readable_server(memcached_st
*memc
)
756 #define MAX_SERVERS_TO_POLL 100
757 struct pollfd fds
[MAX_SERVERS_TO_POLL
];
758 unsigned int host_index
= 0;
760 for (uint32_t x
= 0; x
< memcached_server_count(memc
) && host_index
< MAX_SERVERS_TO_POLL
; ++x
)
762 memcached_server_write_instance_st instance
= memcached_server_instance_fetch(memc
, x
);
764 if (instance
->read_buffer_length
> 0) /* I have data in the buffer */
769 if (memcached_server_response_count(instance
) > 0)
771 fds
[host_index
].events
= POLLIN
;
772 fds
[host_index
].revents
= 0;
773 fds
[host_index
].fd
= instance
->fd
;
780 /* We have 0 or 1 server with pending events.. */
781 for (uint32_t x
= 0; x
< memcached_server_count(memc
); ++x
)
783 memcached_server_write_instance_st instance
=
784 memcached_server_instance_fetch(memc
, x
);
786 if (memcached_server_response_count(instance
) > 0)
795 int error
= poll(fds
, host_index
, memc
->poll_timeout
);
799 memcached_set_errno(*memc
, get_socket_errno(), MEMCACHED_AT
);
805 for (size_t x
= 0; x
< host_index
; ++x
)
807 if (fds
[x
].revents
& POLLIN
)
809 for (uint32_t y
= 0; y
< memcached_server_count(memc
); ++y
)
811 memcached_server_write_instance_st instance
=
812 memcached_server_instance_fetch(memc
, y
);
814 if (instance
->fd
== fds
[x
].fd
)
825 Eventually we will just kill off the server with the problem.
827 void memcached_io_reset(memcached_server_write_instance_st ptr
)
829 memcached_quit_server(ptr
, true);
833 * Read a given number of bytes from the server and place it into a specific
834 * buffer. Reset the IO channel on this server if an error occurs.
836 memcached_return_t
memcached_safe_read(memcached_server_write_instance_st ptr
,
841 char *data
= static_cast<char *>(dta
);
843 while (offset
< size
)
846 memcached_return_t rc
;
848 while (memcached_continue(rc
= memcached_io_read(ptr
, data
+ offset
, size
- offset
, &nread
))) { };
850 if (memcached_failed(rc
))
855 offset
+= (size_t) nread
;
858 return MEMCACHED_SUCCESS
;
861 memcached_return_t
memcached_io_readline(memcached_server_write_instance_st ptr
,
867 bool line_complete
= false;
869 while (line_complete
== false)
871 if (ptr
->read_buffer_length
== 0)
874 * We don't have any data in the buffer, so let's fill the read
875 * buffer. Call the standard read function to avoid duplicating
879 memcached_return_t rc
= memcached_io_read(ptr
, buffer_ptr
, 1, &nread
);
880 if (memcached_failed(rc
) and rc
== MEMCACHED_IN_PROGRESS
)
882 memcached_quit_server(ptr
, true);
883 return memcached_set_error(*ptr
, rc
, MEMCACHED_AT
);
885 else if (memcached_failed(rc
))
890 if (*buffer_ptr
== '\n')
899 /* Now let's look in the buffer and copy as we go! */
900 while (ptr
->read_buffer_length
&& total_nr
< size
&& !line_complete
)
902 *buffer_ptr
= *ptr
->read_ptr
;
903 if (*buffer_ptr
== '\n')
905 line_complete
= true;
907 --ptr
->read_buffer_length
;
913 if (total_nr
== size
)
915 return MEMCACHED_PROTOCOL_ERROR
;
919 return MEMCACHED_SUCCESS
;
922 memcached_return_t
memcached_io_init_udp_header(memcached_server_write_instance_st ptr
, uint16_t thread_id
)
924 if (thread_id
> UDP_REQUEST_ID_MAX_THREAD_ID
)
926 return MEMCACHED_FAILURE
;
929 struct udp_datagram_header_st
*header
= (struct udp_datagram_header_st
*)ptr
->write_buffer
;
930 header
->request_id
= htons((uint16_t) (generate_udp_request_thread_id(thread_id
)));
931 header
->num_datagrams
= htons(1);
932 header
->sequence_number
= htons(0);
934 return MEMCACHED_SUCCESS
;