Getting Started with QNX Neutrino - QNX Software Systems

Alphabetical listing of connect and I/O functions
© 2009, QNX Software Systems GmbH & Co. KG.
Default handler: none
Helper functions: iofunc_link()
Client function: link()
Messages: _IO_CONNECT with subtype _IO_CONNECT_LINK
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;
uint16_t path_len;
};
typedef union {
struct _io_connect
connect;
struct _io_connect_link_reply link_reply;
} io_link_t;
typedef union _io_link_extra {
struct _msg_info
info;
void
*ocb;
char path [1];
struct _io_resmgr_link_extra resmgr;
} io_link_extra_t;
Description: Creates a new link with the name given in the path member of msg to the
already-existing pathname specified by the path member of extra (passed to your
function). For convenience, the ocb member of extra contains a pointer to the OCB for
the existing pathname.
Returns: The status via the helper macro _RESMGR_STATUS.
io_lock()
int io_lock (resmgr_context_t *ctp, io_lock_t *msg, RESMGR_OCB_T
*ocb)
Classification: I/O
Default handler: iofunc_lock_default()
Helper functions: iofunc_lock()
Client functions: fcntl(), lockf(), flock()
Messages: _IO_LOCK
Data structure:
236 Chapter 5 • Resource Managers April 30, 2009