2 Basic socket buffered IO
6 #include "memcached_io.h"
7 #include <sys/select.h>
10 static int io_wait(memcached_st
*ptr
, unsigned int server_key
, unsigned read_or_write
)
16 flags
= POLLOUT
| POLLERR
;
18 flags
= POLLIN
| POLLERR
;
20 memset(&fds
, 0, sizeof(struct pollfd
));
21 fds
[0].fd
= ptr
->hosts
[server_key
].fd
;
24 if (poll(fds
, 1, ptr
->poll_timeout
) < 0)
25 return MEMCACHED_FAILURE
;
27 return MEMCACHED_SUCCESS
;
30 ssize_t
memcached_io_read(memcached_st
*ptr
, unsigned int server_key
,
31 char *buffer
, size_t length
)
39 if (!ptr
->hosts
[server_key
].read_buffer_length
)
45 if (ptr
->flags
& MEM_NO_BLOCK
)
49 rc
= io_wait(ptr
, server_key
, 0);
50 if (rc
!= MEMCACHED_SUCCESS
)
54 data_read
= read(ptr
->hosts
[server_key
].fd
,
55 ptr
->hosts
[server_key
].read_buffer
,
56 MEMCACHED_MAX_BUFFER
);
65 ptr
->cached_errno
= errno
;
72 /* If zero, just keep looping */
75 ptr
->hosts
[server_key
].read_buffer_length
= data_read
;
76 ptr
->hosts
[server_key
].read_ptr
= ptr
->hosts
[server_key
].read_buffer
;
79 *buffer_ptr
= *ptr
->hosts
[server_key
].read_ptr
;
81 ptr
->hosts
[server_key
].read_ptr
++;
82 ptr
->hosts
[server_key
].read_buffer_length
--;
86 return (size_t)(buffer_ptr
- buffer
);
89 ssize_t
memcached_io_write(memcached_st
*ptr
, unsigned int server_key
,
90 char *buffer
, size_t length
, char with_flush
)
94 for (x
= 0; x
< length
; x
++)
96 if (ptr
->hosts
[server_key
].write_ptr
== 0)
97 ptr
->hosts
[server_key
].write_ptr
= ptr
->hosts
[server_key
].write_buffer
;
98 WATCHPOINT_ASSERT(ptr
->hosts
[server_key
].write_ptr
);
99 *ptr
->hosts
[server_key
].write_ptr
= buffer
[x
];
100 ptr
->hosts
[server_key
].write_ptr
++;
101 ptr
->hosts
[server_key
].write_buffer_offset
++;
103 if (ptr
->hosts
[server_key
].write_buffer_offset
== MEMCACHED_MAX_BUFFER
)
107 sent_length
= memcached_io_flush(ptr
, server_key
);
109 WATCHPOINT_ASSERT(sent_length
== MEMCACHED_MAX_BUFFER
);
110 ptr
->hosts
[server_key
].write_ptr
= ptr
->hosts
[server_key
].write_buffer
;
111 ptr
->hosts
[server_key
].write_buffer_offset
= 0;
117 if (memcached_io_flush(ptr
, server_key
) == -1)
124 memcached_return
memcached_io_close(memcached_st
*ptr
, unsigned int server_key
)
128 rc
= MEMCACHED_SUCCESS
;
129 if (ptr
->flags
& MEM_NO_BLOCK
)
131 struct pollfd fds
[1];
134 flags
= POLLHUP
| POLLERR
;
136 memset(&fds
, 0, sizeof(struct pollfd
));
137 fds
[0].fd
= ptr
->hosts
[server_key
].fd
;
138 fds
[0].events
= flags
;
141 if (poll(fds
, 1, ptr
->poll_timeout
== -1 ? 100 : ptr
->poll_timeout
) < 0)
142 rc
= MEMCACHED_FAILURE
;
145 close(ptr
->hosts
[server_key
].fd
);
150 ssize_t
memcached_io_flush(memcached_st
*ptr
, unsigned int server_key
)
153 size_t return_length
;
154 char *write_ptr
= ptr
->hosts
[server_key
].write_buffer
;
155 size_t write_length
= ptr
->hosts
[server_key
].write_buffer_offset
;
156 unsigned int loop
= 1;
158 if (ptr
->hosts
[server_key
].write_buffer_offset
== 0)
164 if (ptr
->flags
& MEM_NO_BLOCK
)
168 rc
= io_wait(ptr
, server_key
, 1);
169 if (rc
!= MEMCACHED_SUCCESS
)
174 if (ptr
->hosts
[server_key
].type
== MEMCACHED_CONNECTION_UDP
)
176 sent_length
= sendto(ptr
->hosts
[server_key
].fd
,
177 write_ptr
, write_length
, 0,
178 (struct sockaddr
*)&ptr
->hosts
[server_key
].address_info
->ai_addr
,
179 sizeof(struct sockaddr
));
183 if ((ssize_t
)(sent_length
= write(ptr
->hosts
[server_key
].fd
, write_ptr
,
184 write_length
)) == -1)
197 /* Yes, we want to fall through */
199 ptr
->cached_errno
= errno
;
205 write_ptr
+= sent_length
;
206 write_length
-= sent_length
;
207 return_length
+= sent_length
;
210 WATCHPOINT_ASSERT(write_length
== 0);
211 WATCHPOINT_ASSERT(return_length
== ptr
->hosts
[server_key
].write_buffer_offset
);
212 ptr
->hosts
[server_key
].write_ptr
= ptr
->hosts
[server_key
].write_buffer
;
213 ptr
->hosts
[server_key
].write_buffer_offset
= 0;
215 return return_length
;
219 Eventually we will just kill off the server with the problem.
221 void memcached_io_reset(memcached_st
*ptr
, unsigned int server_key
)
223 ptr
->hosts
[server_key
].write_ptr
= ptr
->hosts
[server_key
].write_buffer
;
224 ptr
->hosts
[server_key
].write_buffer_offset
= 0;