taglinefilesource code
bp_head222net/unix/sock.cupd->bp_head = upd->bp_tail = 0;
bp_head253net/unix/sock.cupd->bp_head = upd->bp_tail = 0;
bp_head643net/unix/sock.cif (cando >(part = BUF_SIZE - pupd->bp_head)) cando = part;
bp_head650net/unix/sock.cmemcpy_fromfs(pupd->buf + pupd->bp_head, ubuf, cando);
bp_head651net/unix/sock.cpupd->bp_head =(pupd->bp_head + cando) &(BUF_SIZE-1);
bp_head39net/unix/unix.hint    bp_head, bp_tail;
bp_head62net/unix/unix.h#define UN_BUF_AVAIL(UPD)  (((UPD)->bp_head - (UPD)->bp_tail) & \