iofunc_devctl_default()

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 resmgr_io_funcs_t table passed as the io_funcs argument 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. If you write your own handler, you can use iofunc_devctl_verify() to do some validation of the message.

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.

_RESMGR_DEFAULT

The command isn't one that this function handles. You might want your resource manager to process it; otherwise the call to devctl() will return ENOTTY.

Classification:

QNX OS