Getting Started with QNX Neutrino - QNX Software Systems

© 2009, QNX Software Systems GmbH & Co. KG. Alphabetical listing of connect and I/O functions
utility mv will perform a cp followed by an rm (the C library function rename() will do
no such thing — it will return only an errno of EXDEV).
Also, all symlinks will be resolved, where applicable, before this function is called,
and the pathnames passed will be absolute and rooted in the filesystem for which this
resource manager is responsible.
Returns: The status via the helper macro _RESMGR_STATUS.
io_shutdown()
io_space()
int io_shutdown (resmgr_context_t *ctp, io_shutdown_t *msg,
RESMGR_OCB_T *ocb)
This function is reserved by QSS for future use. You should initialize the I/O table
using iofunc_func_init() and not modify this entry.
int io_space (resmgr_context_t *ctp, io_space_t *msg,
RESMGR_OCB_T *ocb)
Classification: I/O
Default handler: none
Helper functions: iofunc_space_verify()
Client functions: chsize(), fcntl(), ftruncate(), ltrunc()
Messages: _IO_SPACE
Data structure:
struct _io_space {
uint16_t
uint16_t
uint16_t
short
uint64_t
uint64_t
};
type;
combine_len;
subtype;
whence;
start;
len;
typedef union {
struct _io_space i;
uint64_t o;
} io_space_t;
Description: This is used to allocate or free space occupied by the resource. The
subtype parameter indicates whether to allocate (if set to F_ALLOCSP) or deallocate
(if set to F_FREESP) storage space. The combination of whence and start give the
location where the beginning of the allocation or deallocation should occur; the
member len indicates the size of the operation.
Returns: The number of bytes (size of the resource) via the helper macro
_RESMGR_STATUS.
April 30, 2009 Chapter 5 • Resource Managers 247