Updated to fedora-glibc-20060306T1239
[glibc.git] / sysdeps / mach / hurd / linkat.c
blob1942144e0faff2c406e12efc539c1a1eaae28459
1 /* Make a link between file names relative to open directories. Hurd version.
2 Copyright (C) 2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <errno.h>
21 #include <fcntl.h>
22 #include <stddef.h>
23 #include <unistd.h>
24 #include <hurd.h>
25 #include <hurd/fd.h>
28 /* Make a link to FROM relative to FROMFD called TO relative to TOFD. */
29 int
30 linkat (fromfd, from, tofd, to, flags)
31 int fromfd;
32 const char *from;
33 int tofd;
34 const char *to;
35 int flags;
37 error_t err;
38 file_t oldfile, linknode, todir;
39 char *toname;
41 oldfile = __file_name_lookup_at (fromfd, flags, from, 0, 0);
42 if (oldfile == MACH_PORT_NULL)
43 return -1;
45 /* The file_getlinknode RPC returns the port that should be passed to
46 the receiving filesystem (the one containing TODIR) in dir_link. */
48 err = __file_getlinknode (oldfile, &linknode);
49 __mach_port_deallocate (__mach_task_self (), oldfile);
50 if (err)
51 return __hurd_fail (err);
53 todir = __file_name_split_at (tofd, to, &toname);
54 if (todir != MACH_PORT_NULL)
56 err = __dir_link (todir, linknode, toname, 1);
57 __mach_port_deallocate (__mach_task_self (), todir);
59 __mach_port_deallocate (__mach_task_self (), linknode);
60 if (todir == MACH_PORT_NULL)
61 return -1;
63 if (err)
64 return __hurd_fail (err);
65 return 0;