/* Write now that connection is set */
static ZERO_OR_ERROR FS_w_given_bus(struct one_wire_query *owq)
{
struct parsedname *pn = PN(owq);
if ( BAD(TestConnection(pn)) ) {
return -ECONNABORTED;
} else if (KnownBus(pn) && BusIsServer(pn->selected_connection)) {
return ServerWrite(owq);
} else if (OWQ_pn(owq).type == ePN_real) {
ZERO_OR_ERROR write_or_error = DeviceLockGet(pn);
if (write_or_error == 0) {
write_or_error = FS_w_local(owq);
DeviceLockRelease(pn);
} else {
LEVEL_DEBUG("Cannot lock device for writing") ;
}
return write_or_error ;
} else if ( IsInterfaceDir(pn) ) {
ZERO_OR_ERROR write_or_error;
BUSLOCK(pn);
write_or_error = FS_w_local(owq);
BUSUNLOCK(pn);
return write_or_error ;
} else {
return FS_w_local(owq);
}
}
// This function should return number of bytes read... not status.
static SIZE_OR_ERROR FS_r_given_bus(struct one_wire_query *owq)
{
// Device locking occurs here
struct parsedname *pn = PN(owq);
SIZE_OR_ERROR read_or_error = 0;
LEVEL_DEBUG("About to read <%s> extension=%d size=%d offset=%d",SAFESTRING(pn->path),(int) pn->extension,(int) OWQ_size(owq),(int) OWQ_offset(owq));
if (KnownBus(pn) && BusIsServer(pn->selected_connection)) {
/* The bus is not local... use a network connection instead */
LEVEL_DEBUG("pid=%ld call ServerRead", pthread_self());
// Read afar -- returns already formatted in buffer
read_or_error = ServerRead(owq);
LEVEL_DEBUG("back from server");
//printf("FS_r_given_bus pid=%ld r=%d\n",pthread_self(), read_or_error);
} else {
STAT_ADD1(read_calls); /* statistics */
if (DeviceLockGet(pn) == 0) {
read_or_error = FS_r_local(owq); // this returns status
DeviceLockRelease(pn);
LEVEL_DEBUG("return=%d", read_or_error);
if (read_or_error >= 0) {
// local success -- now format in buffer
read_or_error = OWQ_parse_output(owq); // this returns nr. bytes
}
} else {
LEVEL_DEBUG("Cannot lock bus to perform read") ;
read_or_error = -EADDRINUSE;
}
}
LEVEL_DEBUG("After read is performed (bytes or error %d)", read_or_error);
Debug_OWQ(owq);
return read_or_error;
}