core.c

xenomai 很好的linux实时补丁

/*
 * Copyright (C) 2005 Joerg Langenberg <[e-mail]>.
 *
 * 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; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */

#include <stdarg.h>
#include <stddef.h>
#include <errno.h>

#include <rtdm/rtdm.h>
#include <rtdm/syscall.h>


extern int __rtdm_muxid;

int rt_dev_open(const char *path, int oflag, ...)
{
    if (__rtdm_muxid < 0)
        return -ENODEV;

    return XENOMAI_SKINCALL2( __rtdm_muxid,
                              __rtdm_open,
                              path,
                              oflag);
}

int rt_dev_socket(int protocol_family, int socket_type, int protocol)
{
    if (__rtdm_muxid < 0)
        return -EAFNOSUPPORT;

    return XENOMAI_SKINCALL3( __rtdm_muxid,
                              __rtdm_socket,
                              protocol_family,
                              socket_type,
                              protocol);
}

int rt_dev_close(int fd)
{
  return XENOMAI_SKINCALL1( __rtdm_muxid,
                            __rtdm_close,
                            fd);
}

int rt_dev_ioctl(int fd, int request, ...)
{
  va_list ap;
  void *arg;

  va_start(ap, request);
  arg = va_arg(ap, void*);
  va_end(ap);

  return XENOMAI_SKINCALL3( __rtdm_muxid,
                            __rtdm_ioctl,
                            fd,
                            request,
                            arg);
}

ssize_t rt_dev_read(int fd, void *buf, size_t nbyte)
{
  return XENOMAI_SKINCALL3( __rtdm_muxid,
                            __rtdm_read,
                            fd,
                            buf,
                            nbyte);
}

ssize_t rt_dev_write(int fd, const void *buf, size_t nbyte)
{
  return XENOMAI_SKINCALL3( __rtdm_muxid,
                            __rtdm_write,
                            fd,
                            buf,
                            nbyte);
}

ssize_t rt_dev_recvmsg(int fd, struct msghdr *msg, int flags)
{
  return XENOMAI_SKINCALL3( __rtdm_muxid,
                            __rtdm_recvmsg,
                            fd,
                            msg,
                            flags);
}

ssize_t rt_dev_sendmsg(int fd, const struct msghdr *msg, int flags)
{
  return XENOMAI_SKINCALL3( __rtdm_muxid,
                            __rtdm_sendmsg,
                            fd,
                            msg,
                            flags);
}

ssize_t rt_dev_recvfrom(int fd, void *buf, size_t len, int flags,
                        struct sockaddr *from,
                        socklen_t *fromlen)
{
    struct iovec    iov = {buf, len};
    struct msghdr   msg =
        {from, (from != NULL) ? *fromlen : 0, &iov, 1, NULL, 0};
    int             ret;

    ret = XENOMAI_SKINCALL3( __rtdm_muxid,
                             __rtdm_recvmsg,
                             fd,
                             &msg,
                             flags);

    if ((ret >= 0) && (from != NULL))
        *fromlen = msg.msg_namelen;
    return ret;
}