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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/mach/hurd/readlinkat.c
1 /* Copyright (C) 1991-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, see <http://www.gnu.org/licenses/>. */
20 #include <hurd/paths.h>
25 /* Read the contents of the symbolic link FILE_NAME relative to FD into no more
26 than LEN bytes of BUF. The contents are not null-terminated.
27 Returns the number of characters read, or -1 for errors. */
29 readlinkat (fd
, file_name
, buf
, len
)
31 const char *file_name
;
39 file
= __file_name_lookup_at (fd
, 0, file_name
, O_READ
| O_NOLINK
, 0);
40 if (file
== MACH_PORT_NULL
)
43 err
= __io_stat (file
, &st
);
45 if (S_ISLNK (st
.st_mode
))
49 err
= __io_read (file
, &rbuf
, &len
, 0, len
);
50 if (!err
&& rbuf
!= buf
)
52 memcpy (buf
, rbuf
, len
);
53 __vm_deallocate (__mach_task_self (), (vm_address_t
)rbuf
, len
);
59 __mach_port_deallocate (__mach_task_self (), file
);
61 return err
? __hurd_fail (err
) : len
;
63 libc_hidden_def (readlinkat
)