iofunc_open_default()

Default handler for _IO_CONNECT messages

Synopsis:

#include <sys/iofunc.h>

int iofunc_open_default( resmgr_context_t *ctp,
                         io_open_t *msg,
                         iofunc_attr_t *attr,
                         void *extra );

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_open_t structure that contains the message that the resource manager received. For more information, see the documentation for iofunc_open().

attr

A pointer to the iofunc_attr_t structure that defines the characteristics of the device that the resource manager is controlling.

extra

Extra information from the library. If you're calling iofunc_open_default() from a resource manager's open() function (see resmgr_connect_funcs_t), simply pass the extra argument that's passed to open().

Library:

libc

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

Description:

The iofunc_open_default() function implements the default actions for the _IO_CONNECT message in a resource manager. This function calls:

• iofunc_open() to check the client's open mode against the resources attributes to see if the client can open the resource in that mode
• iofunc_ocb_calloc() to allocate an Open Control Block (OCB)
• iofunc_ocb_attach() to initialize the OCB
• resmgr_open_bind() to bind the newly-created OCB to the request.

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

See the “Examples” section in the description of iofunc_open() for the skeleton outline of the functionality (the second example, where resmgr_attach() doesn't specify that the managed resource is a directory).

Returns:

EOK

Successful completion.

ENOSPC

There's insufficient memory to allocate the OCB.

ENOMEM

There's insufficient memory to allocate an internal data structure required by resmgr_open_bind().

Classification:

QNX Neutrino

See also:

iofunc_func_init(), iofunc_ocb_attach(), iofunc_ocb_calloc(), iofunc_open(), iofunc_time_update(), resmgr_attach(), resmgr_connect_funcs_t,, resmgr_open_bind()

Writing a Resource Manager

Resource Managers chapter of Getting Started with QNX Neutrino