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/*
* AFS system call for Linux systems.
*
* This is an AFS system call implementation for Linux systems only (and new
* enough implementations of OpenAFS on Linux that /proc/fs/openafs/afs_ioctl
* exists). It is for use on systems that don't have libkafs or libkopenafs,
* or where a dependency on those libraries is not desirable for some reason.
*
* This file is included by kafs/kafs.c on Linux platforms and therefore
* doesn't need its own copy of standard includes, only whatever additional
* data is needed for the Linux interface.
*
* The canonical version of this file is maintained in the rra-c-util package,
* which can be found at <https://www.eyrie.org/~eagle/software/rra-c-util/>.
*
* Written by Russ Allbery <eagle@eyrie.org>
* Copyright 2006-2007, 2009
* The Board of Trustees of the Leland Stanford Junior University
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
/*
* The struct passed to ioctl to do an AFS system call. Definition taken from
* the afs/afs_args.h OpenAFS header.
*/
struct afsprocdata {
long param4;
long param3;
long param2;
long param1;
long syscall;
};
/*
* The workhorse function that does the actual system call. All the values
* are passed as longs to match the internal OpenAFS interface, which means
* that there's all sorts of ugly type conversion happening here.
*
* The first path we attempt is the OpenAFS path; the second is the one used
* by Arla (at least some versions).
*
* Returns -1 and sets errno to ENOSYS if attempting a system call fails and 0
* otherwise. If the system call was made, its return status will be stored
* in rval.
*/
static int
k_syscall(long call, long param1, long param2, long param3, long param4,
int *rval)
{
struct afsprocdata syscall_data;
int fd, oerrno;
fd = open("/proc/fs/openafs/afs_ioctl", O_RDWR);
if (fd < 0)
fd = open("/proc/fs/nnpfs/afs_ioctl", O_RDWR);
if (fd < 0) {
errno = ENOSYS;
return -1;
}
syscall_data.syscall = call;
syscall_data.param1 = param1;
syscall_data.param2 = param2;
syscall_data.param3 = param3;
syscall_data.param4 = param4;
*rval = ioctl(fd, _IOW('C', 1, void *), &syscall_data);
oerrno = errno;
close(fd);
errno = oerrno;
return 0;
}
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