iofunc_write_verify()

Verify a client's write access to a resource

Synopsis:

#include <sys/iofunc.h>

int iofunc_write_verify( resmgr_context_t* ctp,
                         io_write_t* msg,
                         iofunc_ocb_t* ocb,
                         int* nonblock );

Library:

libc

Description:

The iofunc_write_verify() function checks that the client that sent the write message actually has write access to the resource, and, optionally (if nonblock isn't NULL), sets nonblock to O_NONBLOCK or 0.

The write permission check is done against ocb->ioflag.

Note that the io_write_t message has an override flag called msg->i.xtype. This flag allows the client to override the default blocking behavior for the resource on a per-request basis. This override flag is checked, and returned in the optional nonblock.

In write callout for your resource manager, you'll need to indicate how many bytes were written. You can do this with the macro:

_IO_SET_WRITE_NBYTES( resmgr_context_t *ctp,
                      int nbytes )

Returns:

EOK

The client has write access to this resource.

EBADF

The client doesn't have write access to this resource.

Classification:

QNX 6

See also:

iofunc_read_verify()