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/* $OpenBSD: afssys.c,v 1.4 1997/12/12 11:46:31 art Exp $ */
/* $KTH: afssys.c,v 1.53 1997/05/04 02:30:41 assar Exp $ */
/*
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kafs_locl.h"
#define NO_ENTRY_POINT 0
#define SINGLE_ENTRY_POINT 1
#define MULTIPLE_ENTRY_POINT 2
#define SINGLE_ENTRY_POINT2 3
#define SINGLE_ENTRY_POINT3 4
#define AIX_ENTRY_POINTS 5
#define UNKNOWN_ENTRY_POINT 6
static int afs_entry_point = UNKNOWN_ENTRY_POINT;
static int afs_syscalls[2];
int
k_pioctl(char *a_path,
int o_opcode,
struct ViceIoctl *a_paramsP,
int a_followSymlinks)
{
#ifndef NO_AFS
switch(afs_entry_point){
#if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
case SINGLE_ENTRY_POINT:
case SINGLE_ENTRY_POINT2:
case SINGLE_ENTRY_POINT3:
return syscall(afs_syscalls[0], AFSCALL_PIOCTL,
a_path, o_opcode, a_paramsP, a_followSymlinks);
#endif
#if defined(AFS_PIOCTL)
case MULTIPLE_ENTRY_POINT:
return syscall(afs_syscalls[0],
a_path, o_opcode, a_paramsP, a_followSymlinks);
#endif
}
errno = ENOSYS;
kill(getpid(), SIGSYS); /* You loose! */
#endif /* NO_AFS */
return -1;
}
int
k_afs_cell_of_file(const char *path, char *cell, int len)
{
struct ViceIoctl parms;
parms.in = NULL;
parms.in_size = 0;
parms.out = cell;
parms.out_size = len;
return k_pioctl((char*)path, VIOC_FILE_CELL_NAME, &parms, 1);
}
int
k_unlog(void)
{
struct ViceIoctl parms;
memset(&parms, 0, sizeof(parms));
return k_pioctl(0, VIOCUNLOG, &parms, 0);
}
int
k_setpag(void)
{
#ifndef NO_AFS
switch(afs_entry_point){
#if defined(AFS_SYSCALL) || defined(AFS_SYSCALL2) || defined(AFS_SYSCALL3)
case SINGLE_ENTRY_POINT:
case SINGLE_ENTRY_POINT2:
case SINGLE_ENTRY_POINT3:
return syscall(afs_syscalls[0], AFSCALL_SETPAG);
#endif
#if defined(AFS_PIOCTL)
case MULTIPLE_ENTRY_POINT:
return syscall(afs_syscalls[1]);
#endif
}
errno = ENOSYS;
kill(getpid(), SIGSYS); /* You loose! */
#endif /* NO_AFS */
return -1;
}
static jmp_buf catch_SIGSYS;
void
SIGSYS_handler(int sig)
{
errno = 0;
longjmp(catch_SIGSYS, 1);
}
int
k_hasafs(void)
{
int saved_errno;
void (*saved_func)();
struct ViceIoctl parms;
/*
* Already checked presence of AFS syscalls?
*/
if (afs_entry_point != UNKNOWN_ENTRY_POINT)
return afs_entry_point != NO_ENTRY_POINT;
/*
* Probe kernel for AFS specific syscalls,
* they (currently) come in two flavors.
* If the syscall is absent we recive a SIGSYS.
*/
afs_entry_point = NO_ENTRY_POINT;
memset(&parms, 0, sizeof(parms));
saved_errno = errno;
#ifndef NO_AFS
saved_func = signal(SIGSYS, SIGSYS_handler);
#ifdef AFS_SYSCALL
if (setjmp(catch_SIGSYS) == 0)
{
syscall(AFS_SYSCALL, AFSCALL_PIOCTL,
0, VIOCSETTOK, &parms, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
if (errno == EINVAL)
{
afs_entry_point = SINGLE_ENTRY_POINT;
afs_syscalls[0] = AFS_SYSCALL;
goto done;
}
}
#endif /* AFS_SYSCALL */
#ifdef AFS_PIOCTL
if (setjmp(catch_SIGSYS) == 0)
{
syscall(AFS_PIOCTL,
0, VIOCSETTOK, &parms, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
if (errno == EINVAL)
{
afs_entry_point = MULTIPLE_ENTRY_POINT;
afs_syscalls[0] = AFS_PIOCTL;
afs_syscalls[1] = AFS_SETPAG;
goto done;
}
}
#endif /* AFS_PIOCTL */
#ifdef AFS_SYSCALL2
if (setjmp(catch_SIGSYS) == 0)
{
syscall(AFS_SYSCALL2, AFSCALL_PIOCTL,
0, VIOCSETTOK, &parms, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
if (errno == EINVAL)
{
afs_entry_point = SINGLE_ENTRY_POINT2;
afs_syscalls[0] = AFS_SYSCALL2;
goto done;
}
}
#endif /* AFS_SYSCALL */
#ifdef AFS_SYSCALL3
if (setjmp(catch_SIGSYS) == 0)
{
syscall(AFS_SYSCALL3, AFSCALL_PIOCTL,
0, VIOCSETTOK, &parms, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
if (errno == EINVAL)
{
afs_entry_point = SINGLE_ENTRY_POINT3;
afs_syscalls[0] = AFS_SYSCALL3;
goto done;
}
}
#endif /* AFS_SYSCALL */
done:
signal(SIGSYS, saved_func);
#endif /* NO_AFS */
errno = saved_errno;
return afs_entry_point != NO_ENTRY_POINT;
}
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