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Default handler for _IO_SYNC messages
#include <sys/iofunc.h>
int iofunc_sync_default( resmgr_context_t *ctp,
io_sync_t *msg,
iofunc_ocb_t *ocb );
- 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_sync_t
structure that contains the message that the resource manager received.
For more information, see iofunc_sync_verify().
- ocb
- A pointer to the
iofunc_ocb_t
structure for the Open Control Block that was created when the
client opened the resource.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The function iofunc_sync_default() function
implements POSIX semantics for the
client's sync() call, which is received as an
_IO_SYNC message by the resource manager.
You can place this function directly into the io_funcs
table passed to
resmgr_attach(),
at the sync position, or you can call
iofunc_func_init()
to initialize all of the functions to their default values.
The iofunc_sync_default() function calls
iofunc_sync_verify()
to see if the client can synchronize the resource.
- EINVAL
- The resource doesn't support synchronizing.
- EOK
- The client can synchronize the resource.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
iofunc_func_init(),
iofunc_ocb_t,
iofunc_sync(),
iofunc_sync_verify(),
resmgr_attach(),
resmgr_context_t,
resmgr_io_funcs_t
Writing a Resource Manager
Resource Managers
chapter of Getting Started with QNX Neutrino
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