Basic socket buffered IO
*/
-#include <memcached.h>
+#include "common.h"
#include "memcached_io.h"
#include <sys/select.h>
+#include <poll.h>
+
+static int io_wait(memcached_st *ptr, unsigned int server_key, unsigned read_or_write)
+{
+ struct pollfd fds[1];
+ short flags= 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;
+
+ if (poll(fds, 1, -1) < 0)
+ return MEMCACHED_FAILURE;
+
+ return MEMCACHED_SUCCESS;
+}
ssize_t memcached_io_read(memcached_st *ptr, unsigned int server_key,
char *buffer, size_t length)
{
- size_t x;
char *buffer_ptr;
buffer_ptr= buffer;
- for (x= 0, buffer_ptr= buffer;
- x < length; x++)
+ while (length)
{
- if (!ptr->read_buffer_length)
+ if (!ptr->hosts[server_key].read_buffer_length)
{
- if (length > 1)
- {
+ size_t data_read;
- size_t data_read;
- data_read= recv(ptr->hosts[server_key].fd,
- buffer_ptr,
- length - x, 0);
- if (data_read == -1)
- {
- return -1;
- }
- if (data_read == 0)
- return x;
-
- data_read+= x;
-
- return data_read;
- }
- else
+ while (1)
{
- size_t data_read;
-try_again:
-
if (ptr->flags & MEM_NO_BLOCK)
{
- struct timeval local_tv;
- fd_set set;
+ memcached_return rc;
- memset(&local_tv, 0, sizeof(struct timeval));
-
- local_tv.tv_sec= 0;
- local_tv.tv_usec= 300;
-
- FD_ZERO(&set);
- FD_SET(ptr->hosts[server_key].fd, &set);
-
- select(1, &set, NULL, NULL, &local_tv);
+ rc= io_wait(ptr, server_key, 0);
+ if (rc != MEMCACHED_SUCCESS)
+ return -1;
}
- data_read= recv(ptr->hosts[server_key].fd,
- ptr->read_buffer,
- MEMCACHED_MAX_BUFFER, 0);
+ data_read= read(ptr->hosts[server_key].fd,
+ ptr->hosts[server_key].read_buffer,
+ MEMCACHED_MAX_BUFFER);
if (data_read == -1)
{
- if (errno == EAGAIN)
- goto try_again;
- return -1;
+ switch (errno)
+ {
+ case EAGAIN:
+ break;
+ default:
+ {
+ ptr->cached_errno= errno;
+ return -1;
+ }
+ }
}
- ptr->read_buffer_length= data_read;
- ptr->read_ptr= ptr->read_buffer;
+ else if (data_read)
+ break;
+ /* If zero, just keep looping */
}
- if (ptr->read_buffer_length == -1)
- return -1;
- if (ptr->read_buffer_length == 0)
- return x;
+ ptr->hosts[server_key].read_buffer_length= data_read;
+ ptr->hosts[server_key].read_ptr= ptr->hosts[server_key].read_buffer;
}
- *buffer_ptr= *ptr->read_ptr;
+
+ *buffer_ptr= *ptr->hosts[server_key].read_ptr;
+ length--;
+ ptr->hosts[server_key].read_ptr++;
+ ptr->hosts[server_key].read_buffer_length--;
buffer_ptr++;
- ptr->read_ptr++;
- ptr->read_buffer_length--;
}
- return length;
+ return (size_t)(buffer_ptr - buffer);
}
ssize_t memcached_io_write(memcached_st *ptr, unsigned int server_key,
for (x= 0; x < length; x++)
{
- ptr->write_buffer[ptr->write_buffer_offset]= buffer[x];
- ptr->write_buffer_offset++;
+ ptr->hosts[server_key].write_buffer[ptr->hosts[server_key].write_buffer_offset]= buffer[x];
+ ptr->hosts[server_key].write_buffer_offset++;
- if (ptr->write_buffer_offset == MEMCACHED_MAX_BUFFER)
+ if (ptr->hosts[server_key].write_buffer_offset == MEMCACHED_MAX_BUFFER)
{
size_t sent_length;
sent_length= memcached_io_flush(ptr, server_key);
- assert(sent_length == MEMCACHED_MAX_BUFFER);
- ptr->write_buffer_offset= 0;
+ WATCHPOINT_ASSERT(sent_length == MEMCACHED_MAX_BUFFER);
+ ptr->hosts[server_key].write_buffer_offset= 0;
}
}
if (with_flush)
- memcached_io_flush(ptr, server_key);
+ {
+ if (memcached_io_flush(ptr, server_key) == -1)
+ return -1;
+ }
return length;
}
ssize_t memcached_io_flush(memcached_st *ptr, unsigned int server_key)
{
size_t sent_length;
+ size_t return_length;
+ char *write_ptr= ptr->hosts[server_key].write_buffer;
+ size_t write_length= ptr->hosts[server_key].write_buffer_offset;
+ unsigned int loop= 1;
- if (ptr->write_buffer_offset == 0)
+ if (ptr->hosts[server_key].write_buffer_offset == 0)
return 0;
- if (ptr->flags & MEM_NO_BLOCK)
+ return_length= 0;
+ while (write_length)
{
- struct timeval local_tv;
- fd_set set;
+ if (ptr->flags & MEM_NO_BLOCK)
+ {
+ memcached_return rc;
- local_tv.tv_sec= 0;
- local_tv.tv_usec= 300;
+ rc= io_wait(ptr, server_key, 1);
+ if (rc != MEMCACHED_SUCCESS)
+ return -1;
+ }
- FD_ZERO(&set);
- FD_SET(ptr->hosts[server_key].fd, &set);
+ sent_length= 0;
+ if (ptr->hosts[server_key].type == MEMCACHED_CONNECTION_UDP)
+ {
- select(1, NULL, &set, NULL, &local_tv);
- }
- if ((sent_length= send(ptr->hosts[server_key].fd, ptr->write_buffer,
- ptr->write_buffer_offset, 0)) == -1)
- {
- return -1;
- }
+ sent_length= sendto(ptr->hosts[server_key].fd, write_ptr, write_length,
+ 0, 0, 0);
+ /*
+ rc = sendto(sd, argv[i], strlen(argv[i])+1, 0,
+ (struct sockaddr *) &remoteServAddr,
+ sizeof(remoteServAddr));
+ */
+ }
+ else
+ {
+ if ((ssize_t)(sent_length= write(ptr->hosts[server_key].fd, write_ptr,
+ write_length)) == -1)
+ {
+ switch (errno)
+ {
+ case ENOBUFS:
+ case EAGAIN:
+ WATCHPOINT;
+ continue;
+ if (loop < 100)
+ {
+ loop++;
+ break;
+ }
+ /* Yes, we want to fall through */
+ default:
+ ptr->cached_errno= errno;
+ return -1;
+ }
+ }
+ }
- assert(sent_length == ptr->write_buffer_offset);
+ write_ptr+= sent_length;
+ write_length-= sent_length;
+ return_length+= sent_length;
+ }
- ptr->write_buffer_offset= 0;
+ WATCHPOINT_ASSERT(write_length == 0);
+ WATCHPOINT_ASSERT(return_length == ptr->hosts[server_key].write_buffer_offset);
+ ptr->hosts[server_key].write_buffer_offset= 0;
- return sent_length;
+ return return_length;
}
/*
*/
void memcached_io_reset(memcached_st *ptr, unsigned int server_key)
{
- ptr->write_buffer_offset= 0;
+ ptr->hosts[server_key].write_buffer_offset= 0;
memcached_quit(ptr);
}
projects / awesomized / libmemcached / blobdiff