/* Create a device file relative to an open directory.  Hurd version.

   Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C 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 2.1 of the License, or (at your option) any later version.

   The GNU C 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 the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <sys/stat.h>

#include <hurd.h>

#include <hurd/fd.h>

#include <hurd/paths.h>

#include <fcntl.h>

#include <_itoa.h>

#include <string.h>

#include <sys/types.h>

#include <sys/sysmacros.h>

/* Create a device file named PATH relative to FD, with permission and

   special bits MODE and device number DEV (which can be constructed

   from major and minor device numbers with the `makedev' macro

   above).  */

int

__xmknodat (int vers, int fd, const char *path, mode_t mode, dev_t *dev)

{

  error_t errnode, err;

  file_t dir, node;

  char *name;

  char buf[100], *bp;

  const char *translator;

  size_t len;

  if (vers != _MKNOD_VER)

    return __hurd_fail (EINVAL);

  if (S_ISCHR (mode))

    {

      translator = _HURD_CHRDEV;

      len = sizeof (_HURD_CHRDEV);

    }

  else if (S_ISBLK (mode))

    {

      translator = _HURD_BLKDEV;

      len = sizeof (_HURD_BLKDEV);

    }

  else if (S_ISFIFO (mode))

    {

      translator = _HURD_FIFO;

      len = sizeof (_HURD_FIFO);

    }

  else if (S_ISREG (mode))

    {

      translator = NULL;

      len = 0;

    }

  else

    {

      errno = EINVAL;

      return -1;

    }

  if (translator != NULL && ! S_ISFIFO (mode))

    {

      /* We set the translator to "ifmt\0major\0minor\0", where IFMT

	 depends on the S_IFMT bits of our MODE argument, and MAJOR and

	 MINOR are ASCII decimal (octal or hex would do as well)

	 representations of our arguments.  Thus the convention is that

	 CHRDEV and BLKDEV translators are invoked with two non-switch

	 arguments, giving the major and minor device numbers in %i format. */

      bp = buf + sizeof (buf);

      *--bp = '\0';

      bp = _itoa (__gnu_dev_minor (*dev), bp, 10, 0);

      *--bp = '\0';

      bp = _itoa (__gnu_dev_major (*dev), bp, 10, 0);

      memcpy (bp - len, translator, len);

      translator = bp - len;

      len = buf + sizeof (buf) - translator;

    }

  dir = __file_name_split_at (fd, path, &name);

  if (dir == MACH_PORT_NULL)

    return -1;

  /* Create a new, unlinked node in the target directory.  */

  errnode = err = __dir_mkfile (dir, O_WRITE, (mode & ~S_IFMT) & ~_hurd_umask, &node);

  if (! err && translator != NULL)

    /* Set the node's translator to make it a device.  */

    err = __file_set_translator (node,

				 FS_TRANS_EXCL | FS_TRANS_SET,

				 FS_TRANS_EXCL | FS_TRANS_SET, 0,

				 translator, len,

				 MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND);

  if (! err)

    /* Link the node, now a valid device, into the target directory.  */

    err = __dir_link (dir, node, name, 1);

  __mach_port_deallocate (__mach_task_self (), dir);

  if (! errnode)

    __mach_port_deallocate (__mach_task_self (), node);

  if (err)

    return __hurd_fail (err);

  return 0;

}

libc_hidden_def (__xmknodat)