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Initialize an Open Control Block
#include <sys/iofunc.h>
int iofunc_ocb_attach(
resmgr_context_t * ctp,
io_open_t * msg,
iofunc_ocb_t * ocb,
iofunc_attr_t * attr,
const resmgr_io_funcs_t * io_funcs );
- 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().
- ocb
- NULL, or a pointer to the
iofunc_ocb_t
structure for the Open Control Block that was created when the
client opened the resource.
- attr
- A pointer to a
iofunc_attr_t
structure that defines the characteristics of the device that the
resource manager handles.
- io_funcs
- A pointer to a
resmgr_io_funcs_t
that specifies the I/O functions for the resource manager.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The iofunc_ocb_attach() function examines the mode specified
by the io_open msg, and increments the read and write count flags
(ocb->attr->rcount
and ocb->attr->wcount),
and the locking flags
(ocb->attr->rlocks and
ocb->attr->wlocks),
as specified by the open mode.
This function is called by
iofunc_open_default()
as part of its initialization.
This function allocates the memory for the OCB if you pass NULL as the ocb.
- EOK
- Successful completion.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
iofunc_attr_init(),
iofunc_attr_t,
iofunc_ocb_detach(),
iofunc_ocb_t,
iofunc_open_default(),
resmgr_context_t,
resmgr_io_funcs_t
Writing a Resource Manager
Resource Managers
chapter of Getting Started with QNX Neutrino
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