Blame hurd/hurdfchdir.c

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/* Change a port cell to a directory in an open file descriptor.
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   Copyright (C) 1999-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library 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 GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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#include <errno.h>
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#include <unistd.h>
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#include <hurd.h>
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#include <hurd/port.h>
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#include <hurd/fd.h>
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#include <fcntl.h>
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int
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_hurd_change_directory_port_from_fd (struct hurd_port *portcell, int fd)
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{
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  int ret;
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  struct hurd_fd *d = _hurd_fd_get (fd);
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  if (!d)
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    return __hurd_fail (EBADF);
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  HURD_CRITICAL_BEGIN;
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  ret = HURD_PORT_USE (&d->port,
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		       ({
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			 int ret;
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			 /* We look up "." to force ENOTDIR if it's not a
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			    directory and EACCES if we don't have search
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			    permission.  */
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			 file_t dir = __file_name_lookup_under (port, ".",
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								O_NOTRANS, 0);
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			 if (dir == MACH_PORT_NULL)
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			   ret = -1;
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			 else
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			   {
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			     _hurd_port_set (portcell, dir);
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			     ret = 0;
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			   }
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			 ret;
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		       }));
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  HURD_CRITICAL_END;
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  return ret;
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}