1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <errno.h>
19 #include <stddef.h>
20 #include <unistd.h>
21 #include <hurd.h>
22
23 /* Make a link to FROM called TO. */
24 int
__link(const char * from,const char * to)25 __link (const char *from, const char *to)
26 {
27 error_t err;
28 file_t oldfile, linknode, todir;
29 char *toname;
30
31 oldfile = __file_name_lookup (from, 0, 0);
32 if (oldfile == MACH_PORT_NULL)
33 return -1;
34
35 /* The file_getlinknode RPC returns the port that should be passed to
36 the receiving filesystem (the one containing TODIR) in dir_link. */
37
38 err = __file_getlinknode (oldfile, &linknode);
39 __mach_port_deallocate (__mach_task_self (), oldfile);
40 if (err)
41 return __hurd_fail (err);
42
43 todir = __file_name_split (to, &toname);
44 if (todir != MACH_PORT_NULL)
45 {
46 err = __dir_link (todir, linknode, toname, 1);
47 __mach_port_deallocate (__mach_task_self (), todir);
48 }
49 __mach_port_deallocate (__mach_task_self (), linknode);
50 if (todir == MACH_PORT_NULL)
51 return -1;
52
53 if (err)
54 return __hurd_fail (err);
55 return 0;
56 }
57
58 weak_alias (__link, link)
59