static int
devi_devctl(resmgr_context_t *ctp, io_devctl_t *msg, RESMGR_OCB_T *ocb)
{
devi_attr_t *attr;
iov_t iov;
char *buffer, *allocd;
long dcmd;
int error, nbytes;
attr = ocb->ocb.attr;
error = EOK;
if ((error = iofunc_devctl(ctp, msg, &ocb->ocb, &attr->attr)) != _RESMGR_DEFAULT)
return (error);
/* ripped off from deva....:-) */
if (!(get_device_direction(dcmd = msg->i.dcmd) & DEVDIR_TOFROM))
nbytes = 0, buffer = allocd = NULL;
else if ((nbytes = msg->i.nbytes) <= ctp->msg_max_size - sizeof(*msg))
buffer = _DEVCTL_DATA(*msg), allocd = NULL;
else if ((buffer = allocd = malloc((nbytes + 3) & ~3)) == NULL)
return (_RESMGR_ERRNO(ENOMEM));
else if ((get_device_direction(dcmd) & DEVDIR_TO)) {
SETIOV(&iov, buffer, nbytes);
if (resmgr_msgreadv(ctp, &iov, 1, sizeof(msg->i)) == -1)
goto error_out;
}
/* TODO: now call a helper function to actually do the devctl
returns < 0 on error, else nbytes to xfer back on EOK */
msg->o.ret_val = error;
if (error == EOK && get_device_direction(dcmd) & DEVDIR_FROM) {
SETIOV(&iov, buffer, nbytes);
if (resmgr_msgwritev(ctp, &iov, 1, sizeof(msg->o)) == -1)
goto error_out;
}
if (allocd != NULL)
free(allocd);
return((error == EOK) ? _RESMGR_PTR(ctp, &msg->o, sizeof(msg->o)) :
_RESMGR_ERRNO(error));
error_out:
error = errno;
if (allocd != NULL)
free(allocd);
return(_RESMGR_ERRNO(error));
}
static int
mem_read_write(resmgr_context_t *ctp, resmgr_iomsgs_t *msg, struct mem_ocb *ocb) {
void *addr;
unsigned nbytes;
unsigned size;
PROCESS *proc;
union object *obp;
unsigned *pos;
unsigned offset;
size_t skip;
// IO_READ and IO_WRITE messages exactly overlay, as does XTYPE_OFFSET!
if(!ocb) {
nbytes = 0;
goto ok;
}
if(!(ocb->ioflag & ((msg->type == _IO_READ) ? _IO_FLAG_RD : _IO_FLAG_WR))) {
return EBADF;
}
nbytes = msg->read.i.nbytes;
obp = ocb->object;
if((msg->type == _IO_WRITE) && (ocb->ioflag & O_APPEND) && obp) {
ocb->pos = OBJECT_SIZE(obp);
}
switch (msg->read.i.xtype & _IO_XTYPE_MASK)
{
case _IO_XTYPE_NONE:
pos = &ocb->pos;
skip = sizeof(msg->read.i);
break;
case _IO_XTYPE_OFFSET:
offset = ((io_pread_t*)msg)->offset.offset;
pos = &offset;
skip = sizeof(io_pread_t);
break;
default: /* this really shouldn't happen, but just in case */
return ENOSYS;
}
proc = sysmgr_prp;
size = obp ? OBJECT_SIZE(obp) : UINT_MAX;
if( *pos > size - nbytes || *pos + nbytes > size) {
if(obp && msg->type == _IO_WRITE) {
int status;
status = memmgr.resize(obp, *pos + nbytes);
if(status != EOK) {
return status;
}
size = OBJECT_SIZE(obp);
}
if(*pos >= size) {
nbytes = 0;
} else {
nbytes = size - *pos;
}
}
if(nbytes) {
int status, err;
int flags;
part_id_t mpid;
if(proc_thread_pool_reserve() != 0) {
return EAGAIN;
}
ProcessBind(SYSMGR_PID);
proc_wlock_adp(proc);
flags = MAP_SHARED;
if(obp != NULL) {
proc_mux_lock(&obp->mem.mm.mux);
mpid = obp->hdr.mpid;
} else {
flags |= MAP_PHYS;
mpid = part_id_t_INVALID;
}
status = memmgr.mmap(proc, 0, nbytes, PROT_READ|PROT_WRITE, flags,
obp, *pos, 0, nbytes, NOFD, &addr, &size, mpid);
if(obp != NULL) proc_mux_unlock(&obp->mem.mm.mux);
proc_unlock_adp(proc);
if(status != EOK) {
ProcessBind(0);
proc_thread_pool_reserve_done();
return status;
}
SETIOV(ctp->iov + 0, addr, nbytes);
if(msg->type == _IO_READ) {
status = resmgr_msgwritev(ctp, ctp->iov + 0, 1, 0);
} else {
status = resmgr_msgreadv(ctp, ctp->iov + 0, 1, skip);
}
err = errno;
proc_wlock_adp(proc);
(void) memmgr.munmap(proc, (uintptr_t)addr, size, 0, mempart_getid(proc, sys_memclass_id));
proc_unlock_adp(proc);
if(status == -1) {
ProcessBind(0);
proc_thread_pool_reserve_done();
return err;
}
*pos += nbytes;
if(obp && msg->type == _IO_WRITE) {
obp->mem.pm.mtime = time(0);
}
ProcessBind(0);
proc_thread_pool_reserve_done();
}
ok:
_IO_SET_READ_NBYTES(ctp, nbytes);
return EOK;
}