Getting Started with QNX Neutrino - QNX Software Systems

© 2009, QNX Software Systems GmbH & Co. KG. Alphabetical listing of connect and I/O functions
uint32_t
};
flag;
typedef union {
struct _io_sync i;
} io_sync_t;
Description: This is the entry point for a flush command. The helper function
iofunc_sync() is passed the flag member from the input message, and returns one of
the following values, which indicate what actions your resource manager must take:
• 0 — do nothing.
io_unblock() [CONNECT]
io_unblock() [I/O]
• O_SYNC — everything associated with the file (including the file contents,
directory structures, inodes, etc.) must be present and recoverable from media.
• O_DSYNC — only the data portion of the file must be present and recoverable from
media.
Note that this outcall will occur only if you’ve agreed to provide sync services by
setting the mount structure flag.
Returns: Returns the status via the helper macro _RESMGR_STATUS.
int io_unblock (resmgr_context_t *ctp, io_pulse_t *msg,
RESMGR_HANDLE_T *handle, void *reserved)
Classification: Connect (synthesized by kernel, synthesized by library)
Default handler: none
Helper functions: iofunc_unblock()
Client function: none — kernel action due to signal or timeout
Messages: none — synthesized by library
Data structure: (See I/O version of io_unblock(), next)
Description: This is the connect message version of the unblock outcall, synthesized
by the library as a result of a kernel pulse due to the client’s attempt to unblock during
the connect message phase. See the I/O version of io_unblock() for more details.
Returns: The status via the helper macro _RESMGR_STATUS.
See the section in the Message Passing chapter, titled “Using the
_NTO_MI_UNBLOCK_REQ” for a detailed discussion of unblocking strategies.
int io_unblock (resmgr_context_t *ctp, io_pulse_t *msg,
RESMGR_OCB_T *ocb)
Classification: I/O (synthesized by kernel, synthesized by library)
Default handler: iofunc_unblock_default()
April 30, 2009 Chapter 5 • Resource Managers 249