mes/lib/linux/readlink.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2018,2019,2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2021 W. J. van der Laan <laanwj@protonmail.com>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/syscall.h>
#include <arch/syscall.h>
#include <fcntl.h>
#include <sys/stat.h>
ssize_t
readlink (char const *file_name, char *buffer, size_t size)
{
#if defined (SYS_readlink)
return _sys_call3 (SYS_readlink, (long) file_name, (long) buffer, (long) size);
#elif defined (SYS_readlinkat)
return _sys_call4 (SYS_readlinkat, AT_FDCWD, (long) file_name, (long) buffer, (long) size);
#else
#error No usable readlink syscall
#endif
}