mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Copyright (C) 1991-2019 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; see the file COPYING.LIB. If
|
|
not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include <unistd.h>
|
|
#include <hurd.h>
|
|
#include <hurd/paths.h>
|
|
#include <hurd/fd.h>
|
|
#include <fcntl.h>
|
|
#include <string.h>
|
|
|
|
/* Read the contents of the symbolic link FILE_NAME relative to FD into no more
|
|
than LEN bytes of BUF. The contents are not null-terminated.
|
|
Returns the number of characters read, or -1 for errors. */
|
|
ssize_t
|
|
readlinkat (int fd, const char *file_name, char *buf, size_t len)
|
|
{
|
|
error_t err;
|
|
file_t file;
|
|
struct stat64 st;
|
|
|
|
file = __file_name_lookup_at (fd, 0, file_name, O_READ | O_NOLINK, 0);
|
|
if (file == MACH_PORT_NULL)
|
|
return -1;
|
|
|
|
err = __io_stat (file, &st);
|
|
if (! err)
|
|
if (S_ISLNK (st.st_mode))
|
|
{
|
|
char *rbuf = buf;
|
|
|
|
err = __io_read (file, &rbuf, &len, 0, len);
|
|
if (!err && rbuf != buf)
|
|
{
|
|
memcpy (buf, rbuf, len);
|
|
__vm_deallocate (__mach_task_self (), (vm_address_t)rbuf, len);
|
|
}
|
|
}
|
|
else
|
|
err = EINVAL;
|
|
|
|
__mach_port_deallocate (__mach_task_self (), file);
|
|
|
|
return err ? __hurd_fail (err) : len;
|
|
}
|
|
libc_hidden_def (readlinkat)
|