| /* Make a link between file names relative to open directories. Hurd version. |
| Copyright (C) 2006,2010 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/fd.h> |
| |
| |
| /* Make a link to FROM relative to FROMFD called TO relative to TOFD. */ |
| int |
| linkat (fromfd, from, tofd, to, flags) |
| int fromfd; |
| const char *from; |
| int tofd; |
| const char *to; |
| int flags; |
| { |
| error_t err; |
| file_t oldfile, linknode, todir; |
| char *toname; |
| |
| /* POSIX says linkat doesn't follow symlinks by default, so pass |
| O_NOLINK. That can be overridden by AT_SYMLINK_FOLLOW in FLAGS. */ |
| oldfile = __file_name_lookup_at (fromfd, flags, from, O_NOLINK, 0); |
| if (oldfile == MACH_PORT_NULL) |
| return -1; |
| |
| /* The file_getlinknode RPC returns the port that should be passed to |
| the receiving filesystem (the one containing TODIR) in dir_link. */ |
| |
| err = __file_getlinknode (oldfile, &linknode); |
| __mach_port_deallocate (__mach_task_self (), oldfile); |
| if (err) |
| return __hurd_fail (err); |
| |
| todir = __file_name_split_at (tofd, to, &toname); |
| if (todir != MACH_PORT_NULL) |
| { |
| err = __dir_link (todir, linknode, toname, 1); |
| __mach_port_deallocate (__mach_task_self (), todir); |
| } |
| __mach_port_deallocate (__mach_task_self (), linknode); |
| if (todir == MACH_PORT_NULL) |
| return -1; |
| |
| if (err) |
| return __hurd_fail (err); |
| return 0; |
| } |