iofunc_devctl_default()

Default handler for _IO_DEVCTL messages

Synopsis:

#include <sys/iofunc.h>

int iofunc_devctl_default( resmgr_context_t *ctp,
                           io_devctl_t *msg,
                           iofunc_ocb_t *ocb );

Arguments:

ctp

A pointer to a resmgr_context_t structure that the resource-manager library uses to pass context information between functions.

msg

A pointer to the io_devctl_t structure that contains the message that the resource manager received. For more information, see the documentation for iofunc_devctl().

ocb

A pointer to the iofunc_ocb_t structure for the Open Control Block that was created when the client opened the resource.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The iofunc_devctl_default() function implements the default actions for _IO_DEVCTL messages.

You can place this function directly into the io_funcs table passed to resmgr_attach(), at the devctl position, or you can call iofunc_func_init() to initialize all of the functions to their default values.

The iofunc_devctl_default() function calls iofunc_devctl() to do the actual work.

Returns:

EOK

Successful completion.

EINVAL

An attempt to set the flags for a resource that is synchronized, with no mount structure defined, or no synchronized I/O defined.

ENOTTY

An unsupported device control message was decoded.

_RESMGR_DEFAULT

An supported device control message that isn't a known DCMD_ALL_* command was decoded.

Classification:

QNX Neutrino

See also:

iofunc_devctl(), iofunc_func_init(), iofunc_ocb_t, iofunc_time_update(), resmgr_attach(), resmgr_context_t, resmgr_io_funcs_t

Writing a Resource Manager

Resource Managers chapter of Getting Started with QNX Neutrino