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 );
- A pointer to a resmgr_context_t structure that the resource-manager library uses to pass context information between functions.
- 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().
- A pointer to the iofunc_ocb_t structure for the Open Control Block that was created when the client opened the resource.
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.
- The client doesn't have read access to this resource.
- The extended type information is invalid.
- The client has read access to this resource.