Getting Started with QNX Neutrino - QNX Software Systems

Alphabetical listing of connect and I/O functions
© 2009, QNX Software Systems GmbH & Co. KG.
Client functions: lseek(), fseek(), rewinddir()
Messages: _IO_LSEEK
Data structure:
struct _io_lseek {
uint16_t
uint16_t
short
uint16_t
uint64_t
};
type;
combine_len;
whence;
zero;
offset;
typedef union {
struct _io_lseek i;
uint64_t o;
} io_lseek_t;
Description: Handles the client’s lseek() function. Note that a resource manager that
handles directories will also need to interpret the _IO_LSEEK message for directory
operations. The whence and offset parameters are passed from the client’s lseek()
function. The routine should adjust the OCB’s offset parameter after interpreting the
whence and offset parameters from the message and should return the new offset or an
error.
Returns: The status via the helper macro _RESMGR_STATUS, and optionally (if no
error and if not part of a combine message) the current offset.
io_mknod()
int io_mknod (resmgr_context_t *ctp, io_mknod_t *msg,
RESMGR_HANDLE_T *handle, void *reserved)
Classification: Connect
Default handler: none
Helper functions: iofunc_mknod()
Client functions: mknod(), mkdir(), mkfifo()
Messages: _IO_CONNECT, subtype _IO_CONNECT_MKNOD
Data structure:
struct _io_connect {
// internal fields (as described above)
uint16_t path_len;
uint8_t extra_type;
uint16_t extra_len;
char path [1];
};
struct _io_connect_link_reply {
uint32_t reserved1 [2];
uint8_t eflag;
uint8_t reserved2 [3];
uint32_t umask;
uint16_t nentries;
238 Chapter 5 • Resource Managers April 30, 2009