Getting Started with QNX Neutrino - QNX Software Systems

Alphabetical listing of connect and I/O functions
© 2009, QNX Software Systems GmbH & Co. KG.
Only the process manager will call this resource manager function.
Note that a side effect of the process manager’s calling this function is that an OCB
will be created (i.e., iofunc_ocb_calloc() will be called), but this should have no
consequences to a properly implemented resource manager.
Returns: The status via the helper macro _RESMGR_STATUS.
io_mount()
int io_mount (resmgr_context_t *ctp, io_mount_t *msg,
RESMGR_HANDLE_T *handle, io_mount_extra_t *extra)
Classification: Connect
Default handler: none
Client functions: mount(), umount()
Helper functions: none
Messages: _IO_CONNECT with the _IO_CONNECT_MOUNT subtype.
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_mount_t;
Description: This function is called whenever a mount() or umount() client function
sends your resource manager a message. For more information about the io_mount
handler, see “Handling mount()” in the Handling Other Messages chapter of Writing a
Resource Manager.
Returns: The status via the helper macro _IO_SET_CONNECT_RET.
io_msg()
int io_msg (resmgr_context_t *ctp, io_msg_t *msg, RESMGR_OCB_T
*ocb)
Classification: I/O
240 Chapter 5 • Resource Managers April 30, 2009