CHN_F_VCHAN_DYNAMIC
if (!(c->flags & CHN_F_VCHAN_DYNAMIC)) {
CHN_F_VCHAN_DYNAMIC | CHN_F_NBIO | \
if (pflags & CHN_F_VCHAN_DYNAMIC) {
dflags == (c->flags & CHN_F_VCHAN_DYNAMIC) ||
c->flags &= ~CHN_F_VCHAN_DYNAMIC;
(((c)->flags & CHN_F_VCHAN_DYNAMIC) || \
parent->flags &= ~CHN_F_VCHAN_DYNAMIC;
((p->flags & CHN_F_VCHAN_DYNAMIC) ? 0 : FMTLIST_OFFSET);