Getting Started with QNX Neutrino - QNX Software Systems

atoz.c
© 2009, QNX Software Systems GmbH & Co. KG.
{
dispatch_t
*dpp;
resmgr_attr_t
resmgr_attr;
dispatch_context_t *ctp;
resmgr_connect_funcs_t connect_func;
resmgr_io_funcs_t io_func;
iofunc_attr_t
attr;
int i;
// create the dispatch structure
if ((dpp = dispatch_create ()) == NULL) {
perror ("Unable to dispatch_create\n");
exit (EXIT_FAILURE);
}
// initialize the various data structures
memset (&resmgr_attr, 0, sizeof (resmgr_attr));
resmgr_attr.nparts_max = 1;
resmgr_attr.msg_max_size = 2048;
// bind default functions into the outcall tables
iofunc_func_init (_RESMGR_CONNECT_NFUNCS, &connect_func,
_RESMGR_IO_NFUNCS, &io_func);
// create and initialize the attributes structure for the directory
iofunc_attr_init (&attr, S_IFDIR | 0555, 0, 0);
attr.inode = NUM_ENTS + 1; // 1-26 are reserved for ’a’ through ’z’ files
attr.nbytes = NUM_ENTS; // 26 entries contained in this directory
// and for the "a" through "z" names
for (i = 0; i < NUM_ENTS; i++) {
iofunc_attr_init (&atoz_attrs [i], S_IFREG | 0444, 0, 0);
atoz_attrs [i].inode = i + 1;
atoz_attrs [i].nbytes = 1;
}
// add our functions; we’re only interested in io_open and io_read
connect_func.open = my_open;
io_func.read = my_read;
// establish a name in the pathname space
if (resmgr_attach (dpp, &resmgr_attr, "/dev/atoz", _FTYPE_ANY,
_RESMGR_FLAG_DIR, &connect_func, &io_func,
&attr) == -1) {
perror ("Unable to resmgr_attach\n");
exit (EXIT_FAILURE);
}
// allocate a context
ctp = dispatch_context_alloc (dpp);
// wait here forever, handling messages
while (1) {
if ((ctp = dispatch_block (ctp)) == NULL) {
perror ("Unable to dispatch_block\n");
exit (EXIT_FAILURE);
}
dispatch_handler (ctp);
}
}
// you’ll never get here
return (EXIT_SUCCESS);
316 Appendix: C • Sample Programs April 30, 2009