/* Create a symbolic link named relative to an open directory.  Hurd version.   Copyright (C) 1991,1992,1993,1994,1995,1996,1997,2006	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, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include <errno.h>#include <fcntl.h>#include <stddef.h>#include <unistd.h>#include <hurd.h>#include <hurd/paths.h>#include <hurd/fd.h>#include <string.h>/* Make a link to FROM called TO relative to FD.  */intsymlinkat (from, fd, to)     const char *from;     int fd;     const char *to;{  error_t err;  file_t dir, node;  char *name;  const size_t len = strlen (from) + 1;  char buf[sizeof (_HURD_SYMLINK) + len];  /* A symlink is a file whose translator is "/hurd/symlink\0target\0".  */  memcpy (buf, _HURD_SYMLINK, sizeof (_HURD_SYMLINK));  memcpy (&buf[sizeof (_HURD_SYMLINK)], from, len);  dir = __file_name_split_at (fd, to, &name);  if (dir == MACH_PORT_NULL)    return -1;  /* Create a new, unlinked node in the target directory.  */  err = __dir_mkfile (dir, O_WRITE, 0777 & ~_hurd_umask, &node);  if (! err)    /* Set the node's translator to make it a symlink.  */    err = __file_set_translator (node,				 FS_TRANS_EXCL|FS_TRANS_SET,				 FS_TRANS_EXCL|FS_TRANS_SET, 0,				 buf, sizeof (_HURD_SYMLINK) + len,				 MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND);  if (! err)    /* Link the node, now a valid symlink, into the target directory.  */    err = __dir_link (dir, node, name, 1);  __mach_port_deallocate (__mach_task_self (), dir);  __mach_port_deallocate (__mach_task_self (), node);  if (err)    return __hurd_fail (err);  return 0;}