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Default handler for _IO_READ messages
#include <sys/iofunc.h>
int iofunc_read_default( resmgr_context_t *ctp,
io_read_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_read_t
structure that contains the message that the resource manager received.
For more information, see the documentation for
iofunc_read_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 iofunc_read_default() function
implements POSIX semantics for the
client's read() call, which is received as an
_IO_READ message by the resource manager.
You can place this function directly into the io_funcs
table passed to
resmgr_attach(),
at the read position, or you can call
iofunc_func_init()
to initialize all of the functions to their default values.
The iofunc_read_default() function calls
iofunc_read_verify()
to check the permissions on the file.
If the permissions are appropriate, iofunc_read_default()
indicates that it read zero bytes.
- EBADF
- The client doesn't have read access to this resource.
- EINVAL
- The extended type information is invalid.
- EOK
- The client has read access to this resource.
QNX Neutrino
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
iofunc_func_init(),
iofunc_ocb_t,
iofunc_read_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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