static bool bothdowncandidates(node_t * u, node_t * v)
{
edge_t *e, *f;
e = ND_in(u).list[0];
f = ND_in(v).list[0];
if (downcandidate(v) && (e->tail == f->tail)) {
return samedir(e, f)
&& (portcmp(ED_tail_port(e), ED_tail_port(f)) == 0);
}
return FALSE;
}
static bool bothupcandidates(node_t * u, node_t * v)
{
edge_t *e, *f;
e = ND_out(u).list[0];
f = ND_out(v).list[0];
if (upcandidate(v) && (e->head == f->head)) {
return samedir(e, f)
&& (portcmp(ED_head_port(e), ED_head_port(f)) == 0);
}
return FALSE;
}
/*
* If the minor name begins with [a-d] and the
* links in /dev/term/<char> and /dev/cua/<char>
* don't point at a different minor, then we can
* create compatibility links for this minor.
* Returns:
* port id if a compatibility link can be created.
* NULL otherwise
*/
static char *
check_compat_ports(char *phys_path, char *minor)
{
char portid = *minor;
char port[PATH_MAX];
char *devfs_path;
if (portid < 'a' || portid > 'd')
return (NULL);
(void) snprintf(port, sizeof (port), "term/%c", portid);
if (devfsadm_read_link(port, &devfs_path) == DEVFSADM_SUCCESS &&
portcmp(devfs_path, phys_path) != 0) {
free(devfs_path);
return (NULL);
}
free(devfs_path);
(void) snprintf(port, sizeof (port), "cua/%c", portid);
if (devfsadm_read_link(port, &devfs_path) == DEVFSADM_SUCCESS &&
portcmp(devfs_path, phys_path) != 0) {
free(devfs_path);
return (NULL);
}
free(devfs_path);
/*
* Neither link exists or both links point at "phys_path"
* We can safely create compatibility links.
*/
port[0] = portid;
port[1] = '\0';
return (s_strdup(port));
}
