taglinefilesource code
xtail330drivers/net/ppp.cppp->xtail    = NULL;
xtail714drivers/net/ppp.cppp->xtail = ppp->xbuff + actual;
xtail731drivers/net/ppp.cif (!ppp->xtail)
xtail742drivers/net/ppp.ccount = ppp->xhead - ppp->xtail;
xtail744drivers/net/ppp.cactual = tty->driver.write(tty, 0, ppp->xtail, count);
xtail747drivers/net/ppp.cppp->xtail = 0;
xtail752drivers/net/ppp.cppp->xtail += actual;
xtail211include/linux/if_ppp.hunsigned char   *xtail;    /* XMIT buffer pointer (end)   */