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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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* Helper to fill most of the Vio* with defaults.
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static void vio_init(Vio* vio, enum enum_vio_type type,
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int sd, uint32_t flags)
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#ifndef HAVE_VIO_READ_BUFF
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flags&= ~VIO_BUFFERED_READ;
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memset(vio, 0, sizeof(*vio));
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if ((flags & VIO_BUFFERED_READ) &&
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!(vio->read_buffer= (char*)my_malloc(VIO_READ_BUFFER_SIZE, MYF(MY_WME))))
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flags&= ~VIO_BUFFERED_READ;
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vio->viodelete =vio_delete;
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vio->vioerrno =vio_errno;
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vio->read= (flags & VIO_BUFFERED_READ) ? vio_read_buff : vio_read;
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vio->write =vio_write;
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vio->fastsend =vio_fastsend;
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vio->viokeepalive =vio_keepalive;
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vio->should_retry =vio_should_retry;
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vio->was_interrupted=vio_was_interrupted;
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vio->vioclose =vio_close;
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vio->peer_addr =vio_peer_addr;
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vio->vioblocking =vio_blocking;
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vio->is_blocking =vio_is_blocking;
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vio->timeout =vio_timeout;
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/* Reset initialized VIO to use with another transport type */
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void vio_reset(Vio* vio, enum enum_vio_type type,
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int sd, uint32_t flags)
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free(vio->read_buffer);
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vio_init(vio, type, sd, flags);
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/* Open the socket or TCP/IP connection and read the fnctl() status */
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Vio *vio_new(int sd, enum enum_vio_type type, uint32_t flags)
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if ((vio = (Vio*) my_malloc(sizeof(*vio),MYF(MY_WME))))
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vio_init(vio, type, sd, flags);
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sprintf(vio->desc, "TCP/IP (%d)", vio->sd);
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We call fcntl() to set the flags and then immediately read them back
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to make sure that we and the system are in agreement on the state of
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An example of why we need to do this is FreeBSD (and apparently some
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other BSD-derived systems, like Mac OS X), where the system sometimes
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reports that the socket is set for non-blocking when it really will
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fcntl(sd, F_SETFL, 0);
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vio->fcntl_mode= fcntl(sd, F_GETFL);
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void vio_delete(Vio* vio)
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return; /* It must be safe to delete null pointers. */
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if (vio->type != VIO_CLOSED)
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free((unsigned char*) vio->read_buffer);
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free((unsigned char*) vio);
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Cleanup memory allocated by vio or the
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components below it when application finish