CHN_F_ABORTING
c->flags |= CHN_F_ABORTING;
c->flags |= CHN_F_ABORTING;
if ((c->flags & (CHN_F_DEAD | CHN_F_ABORTING)) ||
c->flags |= CHN_F_ABORTING;
c->flags |= CHN_F_ABORTING;
c->flags &= ~CHN_F_ABORTING;