xen/tools/libs/evtchn/linux.c

/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; If not, see <http://www.gnu.org/licenses/>.
 *
 * Split out from xc_linus_osdep.c:
 *
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 */

#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>

#include <sys/ioctl.h>

#include <xen/xen.h>
#include <xen/sys/evtchn.h>

#include "private.h"

#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif

int osdep_evtchn_open(xenevtchn_handle *xce, unsigned int flags)
{
    int open_flags = O_RDWR;
    int fd;

    if ( !(flags & XENEVTCHN_NO_CLOEXEC) )
        open_flags |= O_CLOEXEC;

    fd = open("/dev/xen/evtchn", open_flags);
    if ( fd == -1 )
        return -1;

    xce->fd = fd;

    return 0;
}

int osdep_evtchn_close(xenevtchn_handle *xce)
{
    if ( xce->fd == -1 )
        return 0;

    return close(xce->fd);
}

int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
{
    struct ioctl_evtchn_restrict_domid restrict_domid = { domid };

    return ioctl(xce->fd, IOCTL_EVTCHN_RESTRICT_DOMID, &restrict_domid);
}

int xenevtchn_fd(xenevtchn_handle *xce)
{
    return xce->fd;
}

int xenevtchn_notify(xenevtchn_handle *xce, evtchn_port_t port)
{
    int fd = xce->fd;
    struct ioctl_evtchn_notify notify;

    notify.port = port;

    return ioctl(fd, IOCTL_EVTCHN_NOTIFY, &notify);
}

xenevtchn_port_or_error_t xenevtchn_bind_unbound_port(xenevtchn_handle *xce,
                                                      uint32_t domid)
{
    int fd = xce->fd;
    struct ioctl_evtchn_bind_unbound_port bind;

    bind.remote_domain = domid;

    return ioctl(fd, IOCTL_EVTCHN_BIND_UNBOUND_PORT, &bind);
}

xenevtchn_port_or_error_t xenevtchn_bind_interdomain(xenevtchn_handle *xce,
                                                     uint32_t domid,
                                                     evtchn_port_t remote_port)
{
    int fd = xce->fd;
    struct ioctl_evtchn_bind_interdomain bind;

    bind.remote_domain = domid;
    bind.remote_port = remote_port;

    return ioctl(fd, IOCTL_EVTCHN_BIND_INTERDOMAIN, &bind);
}

xenevtchn_port_or_error_t xenevtchn_bind_virq(xenevtchn_handle *xce,
                                              unsigned int virq)
{
    int fd = xce->fd;
    struct ioctl_evtchn_bind_virq bind;

    bind.virq = virq;

    return ioctl(fd, IOCTL_EVTCHN_BIND_VIRQ, &bind);
}

int xenevtchn_unbind(xenevtchn_handle *xce, evtchn_port_t port)
{
    int fd = xce->fd;
    struct ioctl_evtchn_unbind unbind;

    unbind.port = port;

    return ioctl(fd, IOCTL_EVTCHN_UNBIND, &unbind);
}

xenevtchn_port_or_error_t xenevtchn_pending(xenevtchn_handle *xce)
{
    int fd = xce->fd;
    evtchn_port_t port;

    if ( read(fd, &port, sizeof(port)) != sizeof(port) )
        return -1;

    return port;
}

int xenevtchn_unmask(xenevtchn_handle *xce, evtchn_port_t port)
{
    int fd = xce->fd;

    if ( write(fd, &port, sizeof(port)) != sizeof(port) )
        return -1;

    return 0;
}

/*
 * Local variables:
 * mode: C
 * c-file-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */