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/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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Note that we can't have assertion on file descriptors; The reason for
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this is that during mysql shutdown, another thread can close a file
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we are working on. In this case we should just return read errors from
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#include <sys/socket.h>
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int vio_errno(Vio *vio __attribute__((unused)))
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size_t vio_read(Vio * vio, unsigned char* buf, size_t size)
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/* Ensure nobody uses vio_read_buff and vio_read simultaneously */
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assert(vio->read_end == vio->read_pos);
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r= read(vio->sd, buf, size);
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Buffered read: if average read size is small it may
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reduce number of syscalls.
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size_t vio_read_buff(Vio *vio, unsigned char* buf, size_t size)
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#define VIO_UNBUFFERED_READ_MIN_SIZE 2048
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if (vio->read_pos < vio->read_end)
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rc= cmin((size_t) (vio->read_end - vio->read_pos), size);
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memcpy(buf, vio->read_pos, rc);
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Do not try to read from the socket now even if rc < size:
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vio_read can return -1 due to an error or non-blocking mode, and
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the safest way to handle it is to move to a separate branch.
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else if (size < VIO_UNBUFFERED_READ_MIN_SIZE)
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rc= vio_read(vio, (unsigned char*) vio->read_buffer, VIO_READ_BUFFER_SIZE);
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if (rc != 0 && rc != (size_t) -1)
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vio->read_pos= vio->read_buffer + size;
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vio->read_end= vio->read_buffer + rc;
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memcpy(buf, vio->read_buffer, rc);
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rc= vio_read(vio, buf, size);
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#undef VIO_UNBUFFERED_READ_MIN_SIZE
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size_t vio_write(Vio * vio, const unsigned char* buf, size_t size)
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r = write(vio->sd, buf, size);
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int vio_blocking(Vio * vio, bool set_blocking_mode, bool *old_mode)
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*old_mode= test(!(vio->fcntl_mode & O_NONBLOCK));
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int old_fcntl=vio->fcntl_mode;
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if (set_blocking_mode)
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vio->fcntl_mode &= ~O_NONBLOCK; /* clear bit */
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vio->fcntl_mode |= O_NONBLOCK; /* set bit */
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if (old_fcntl != vio->fcntl_mode)
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r= fcntl(vio->sd, F_SETFL, vio->fcntl_mode);
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vio->fcntl_mode= old_fcntl;
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vio_is_blocking(Vio * vio)
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r = !(vio->fcntl_mode & O_NONBLOCK);
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int vio_fastsend(Vio * vio __attribute__((unused)))
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error= setsockopt(vio->sd, IPPROTO_TCP, TCP_NODELAY,
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&nodelay, sizeof(nodelay));
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perror("setsockopt");
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int32_t vio_keepalive(Vio* vio, bool set_keep_alive)
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r= setsockopt(vio->sd, SOL_SOCKET, SO_KEEPALIVE, (char *) &opt, sizeof(opt));
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perror("setsockopt");
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vio_should_retry(Vio * vio __attribute__((unused)))
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return (en == EAGAIN || en == EINTR ||
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vio_was_interrupted(Vio *vio __attribute__((unused)))
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return (en == EAGAIN || en == EINTR ||
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en == EWOULDBLOCK || en == ETIMEDOUT);
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int vio_close(Vio * vio)
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if (vio->type != VIO_CLOSED)
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assert(vio->sd >= 0);
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if (shutdown(vio->sd, SHUT_RDWR))
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vio->type= VIO_CLOSED;
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const char *vio_description(Vio * vio)
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enum enum_vio_type vio_type(Vio* vio)
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bool vio_peer_addr(Vio *vio, char *buf, uint16_t *port, size_t buflen)
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char port_buf[NI_MAXSERV];
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socklen_t addrLen = sizeof(vio->remote);
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if (getpeername(vio->sd, (struct sockaddr *) (&vio->remote),
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vio->addrLen= (int)addrLen;
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if ((error= getnameinfo((struct sockaddr *)(&vio->remote),
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port_buf, NI_MAXSERV, NI_NUMERICHOST|NI_NUMERICSERV)))
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*port= (uint16_t)strtol(port_buf, (char **)NULL, 10);
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/* Return 0 if there is data to be read */
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bool vio_poll_read(Vio *vio, int32_t timeout)
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if ((res=poll(&fds,1,(int) timeout*1000)) <= 0)
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return res < 0 ? false : true; /* Don't return 1 on errors */
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return (fds.revents & (POLLIN | POLLERR | POLLHUP) ? false : true);
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bool vio_peek_read(Vio *vio, uint32_t *bytes)
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ssize_t res= recv(vio->sd, &buf, sizeof(buf), MSG_PEEK);
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*bytes= (uint32_t)res;
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void vio_timeout(Vio *vio, bool is_sndtimeo, int32_t timeout)
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/* POSIX specifies time as struct timeval. */
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struct timeval wait_timeout;
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wait_timeout.tv_sec= timeout;
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wait_timeout.tv_usec= 0;
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assert(timeout >= 0 && timeout <= INT32_MAX);
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assert(vio->sd != -1);
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error= setsockopt(vio->sd, SOL_SOCKET, is_sndtimeo ? SO_SNDTIMEO : SO_RCVTIMEO,
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(socklen_t)sizeof(struct timeval));
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perror("setsockopt");