/*
* Called once to initialize data structures...
*/
static int
nfssvc_modevent(module_t mod, int type, void *data)
{
static int registered;
int error = 0;
switch (type) {
case MOD_LOAD:
error = syscall_register(&nfssvc_offset, &nfssvc_sysent,
&nfssvc_prev_sysent, SY_THR_STATIC_KLD);
if (error)
break;
registered = 1;
break;
case MOD_UNLOAD:
if (nfsd_call_nfsserver != NULL || nfsd_call_nfscommon != NULL
|| nfsd_call_nfscl != NULL || nfsd_call_nfsd != NULL) {
error = EBUSY;
break;
}
if (registered)
syscall_deregister(&nfssvc_offset, &nfssvc_prev_sysent);
registered = 0;
break;
default:
error = EOPNOTSUPP;
break;
}
return error;
}
int
syscall_helper_unregister(struct syscall_helper_data *sd)
{
struct syscall_helper_data *sd1;
for (sd1 = sd; sd1->registered != 0; sd1++) {
syscall_deregister(&sd1->syscall_no, &sd1->old_sysent);
sd1->registered = 0;
}
return (0);
}
int
syscall_module_handler(struct module *mod, int what, void *arg)
{
struct syscall_module_data *data = arg;
modspecific_t ms;
int error;
switch (what) {
case MOD_LOAD:
error = syscall_register(data->offset, data->new_sysent,
&data->old_sysent, data->flags);
if (error) {
/* Leave a mark so we know to safely unload below. */
data->offset = NULL;
return (error);
}
ms.intval = *data->offset;
MOD_XLOCK;
module_setspecific(mod, &ms);
MOD_XUNLOCK;
if (data->chainevh)
error = data->chainevh(mod, what, data->chainarg);
return (error);
case MOD_UNLOAD:
/*
* MOD_LOAD failed, so just return without calling the
* chained handler since we didn't pass along the MOD_LOAD
* event.
*/
if (data->offset == NULL)
return (0);
if (data->chainevh) {
error = data->chainevh(mod, what, data->chainarg);
if (error)
return error;
}
error = syscall_deregister(data->offset, &data->old_sysent);
return (error);
default:
if (data->chainevh)
return (data->chainevh(mod, what, data->chainarg));
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
int
afs_uninit(struct vfsconf *vfc)
{
#if defined(AFS_FBSD90_ENV) || defined(AFS_FBSD82_ENV)
int offset = AFS_SYSCALL;
#endif
if (afs_globalVFS)
return EBUSY;
#if defined(AFS_FBSD90_ENV) || defined(AFS_FBSD82_ENV)
syscall_deregister(&offset, &old_sysent);
#else
sysent[AFS_SYSCALL].sy_narg = 0;
sysent[AFS_SYSCALL].sy_call = old_handler;
#endif
return 0;
}
