1
/* Copyright (C) 2000 MySQL AB
3
This program is free software; you can redistribute it and/or modify
4
it under the terms of the GNU General Public License as published by
5
the Free Software Foundation; version 2 of the License.
7
This program is distributed in the hope that it will be useful,
8
but WITHOUT ANY WARRANTY; without even the implied warranty of
9
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10
GNU General Public License for more details.
12
You should have received a copy of the GNU General Public License
13
along with this program; if not, write to the Free Software
14
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
17
Note that we can't have assertion on file descriptors; The reason for
18
this is that during mysql shutdown, another thread can close a file
19
we are working on. In this case we should just return read errors from
24
#include <drizzled/global.h>
25
#include <libdrizzle/vio.h>
26
#include <sys/socket.h>
27
#include <drizzled/util/test.h>
30
#include <netinet/tcp.h>
35
int vio_errno(Vio *vio __attribute__((unused)))
41
size_t vio_read(Vio * vio, unsigned char* buf, size_t size)
45
/* Ensure nobody uses vio_read_buff and vio_read simultaneously */
46
assert(vio->read_end == vio->read_pos);
47
r= read(vio->sd, buf, size);
54
Buffered read: if average read size is small it may
55
reduce number of syscalls.
58
size_t vio_read_buff(Vio *vio, unsigned char* buf, size_t size)
61
#define VIO_UNBUFFERED_READ_MIN_SIZE 2048
63
if (vio->read_pos < vio->read_end)
65
rc= cmin((size_t) (vio->read_end - vio->read_pos), size);
66
memcpy(buf, vio->read_pos, rc);
69
Do not try to read from the socket now even if rc < size:
70
vio_read can return -1 due to an error or non-blocking mode, and
71
the safest way to handle it is to move to a separate branch.
74
else if (size < VIO_UNBUFFERED_READ_MIN_SIZE)
76
rc= vio_read(vio, (unsigned char*) vio->read_buffer, VIO_READ_BUFFER_SIZE);
77
if (rc != 0 && rc != (size_t) -1)
81
vio->read_pos= vio->read_buffer + size;
82
vio->read_end= vio->read_buffer + rc;
85
memcpy(buf, vio->read_buffer, rc);
89
rc= vio_read(vio, buf, size);
92
#undef VIO_UNBUFFERED_READ_MIN_SIZE
96
size_t vio_write(Vio * vio, const unsigned char* buf, size_t size)
100
r = write(vio->sd, buf, size);
105
int vio_blocking(Vio * vio, bool set_blocking_mode, bool *old_mode)
109
*old_mode= test(!(vio->fcntl_mode & O_NONBLOCK));
113
int old_fcntl=vio->fcntl_mode;
114
if (set_blocking_mode)
115
vio->fcntl_mode &= ~O_NONBLOCK; /* clear bit */
117
vio->fcntl_mode |= O_NONBLOCK; /* set bit */
118
if (old_fcntl != vio->fcntl_mode)
120
r= fcntl(vio->sd, F_SETFL, vio->fcntl_mode);
123
vio->fcntl_mode= old_fcntl;
132
vio_is_blocking(Vio * vio)
135
r = !(vio->fcntl_mode & O_NONBLOCK);
141
int vio_fastsend(Vio * vio __attribute__((unused)))
146
error= setsockopt(vio->sd, IPPROTO_TCP, TCP_NODELAY,
147
&nodelay, sizeof(nodelay));
150
perror("setsockopt");
157
int32_t vio_keepalive(Vio* vio, bool set_keep_alive)
165
r= setsockopt(vio->sd, SOL_SOCKET, SO_KEEPALIVE, (char *) &opt, sizeof(opt));
168
perror("setsockopt");
177
vio_should_retry(Vio * vio __attribute__((unused)))
180
return (en == EAGAIN || en == EINTR ||
186
vio_was_interrupted(Vio *vio __attribute__((unused)))
189
return (en == EAGAIN || en == EINTR ||
190
en == EWOULDBLOCK || en == ETIMEDOUT);
194
int vio_close(Vio * vio)
197
if (vio->type != VIO_CLOSED)
199
assert(vio->sd >= 0);
200
if (shutdown(vio->sd, SHUT_RDWR))
205
vio->type= VIO_CLOSED;
212
const char *vio_description(Vio * vio)
217
enum enum_vio_type vio_type(Vio* vio)
227
bool vio_peer_addr(Vio *vio, char *buf, uint16_t *port, size_t buflen)
230
char port_buf[NI_MAXSERV];
231
socklen_t addrLen = sizeof(vio->remote);
233
if (getpeername(vio->sd, (struct sockaddr *) (&vio->remote),
238
vio->addrLen= (int)addrLen;
240
if ((error= getnameinfo((struct sockaddr *)(&vio->remote),
243
port_buf, NI_MAXSERV, NI_NUMERICHOST|NI_NUMERICSERV)))
248
*port= (uint16_t)strtol(port_buf, (char **)NULL, 10);
254
/* Return 0 if there is data to be read */
256
bool vio_poll_read(Vio *vio, int32_t timeout)
264
if ((res=poll(&fds,1,(int) timeout*1000)) <= 0)
266
return res < 0 ? false : true; /* Don't return 1 on errors */
268
return (fds.revents & (POLLIN | POLLERR | POLLHUP) ? false : true);
272
bool vio_peek_read(Vio *vio, uint32_t *bytes)
275
ssize_t res= recv(vio->sd, &buf, sizeof(buf), MSG_PEEK);
279
*bytes= (uint32_t)res;
283
void vio_timeout(Vio *vio, bool is_sndtimeo, int32_t timeout)
287
/* POSIX specifies time as struct timeval. */
288
struct timeval wait_timeout;
289
wait_timeout.tv_sec= timeout;
290
wait_timeout.tv_usec= 0;
292
assert(timeout >= 0 && timeout <= INT32_MAX);
293
assert(vio->sd != -1);
294
error= setsockopt(vio->sd, SOL_SOCKET, is_sndtimeo ? SO_SNDTIMEO : SO_RCVTIMEO,
296
(socklen_t)sizeof(struct timeval));
299
perror("setsockopt");