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 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 Neutrino

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes