2 Basic socket buffered IO
6 #include "memcached_io.h"
7 #include <sys/select.h>
10 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, -1) < 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
->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
= recv(ptr
->hosts
[server_key
].fd
,
56 MEMCACHED_MAX_BUFFER
, 0);
72 /* If zero, just keep looping */
75 ptr
->read_buffer_length
= data_read
;
76 ptr
->read_ptr
= ptr
->read_buffer
;
79 *buffer_ptr
= *ptr
->read_ptr
;
82 ptr
->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 ptr
->write_buffer
[ptr
->write_buffer_offset
]= buffer
[x
];
97 ptr
->write_buffer_offset
++;
99 if (ptr
->write_buffer_offset
== MEMCACHED_MAX_BUFFER
)
103 sent_length
= memcached_io_flush(ptr
, server_key
);
105 WATCHPOINT_ASSERT(sent_length
== MEMCACHED_MAX_BUFFER
);
106 ptr
->write_buffer_offset
= 0;
112 if (memcached_io_flush(ptr
, server_key
) == -1)
119 ssize_t
memcached_io_flush(memcached_st
*ptr
, unsigned int server_key
)
122 char *write_ptr
= ptr
->write_buffer
;
123 size_t write_length
= ptr
->write_buffer_offset
;
124 unsigned int loop
= 1;
126 if (ptr
->write_buffer_offset
== 0)
131 if (ptr
->flags
& MEM_NO_BLOCK
)
135 rc
= io_wait(ptr
, server_key
, 1);
136 if (rc
!= MEMCACHED_SUCCESS
)
141 if ((sent_length
= write(ptr
->hosts
[server_key
].fd
, write_ptr
,
142 write_length
)) == -1)
153 /* Yes, we want to fall through */
155 ptr
->my_errno
= errno
;
161 write_ptr
+= sent_length
;
162 write_length
-= sent_length
;
166 ptr
->write_buffer_offset
= 0;
172 Eventually we will just kill off the server with the problem.
174 void memcached_io_reset(memcached_st
*ptr
, unsigned int server_key
)
176 ptr
->write_buffer_offset
= 0;