taglinefilesource code
linger90include/net/sock.hlinger,
linger123net/core/sock.cstruct linger ling;
linger200net/core/sock.csk->linger=0;
linger204net/core/sock.csk->linger=1;
linger220net/core/sock.cstruct linger ling;
linger281net/core/sock.cling.l_onoff=sk->linger;
linger649net/ipv4/af_inet.csk->linger = 0;
linger805net/ipv4/af_inet.cif (sk->linger == 0 || (current->flags & PF_EXITING))
linger2731net/ipv4/tcp.cnewsk->linger=0;