tcp_write_wakeup 465 include/net/tcp.h extern int tcp_write_wakeup(struct sock *); tcp_write_wakeup 2592 net/ipv4/tcp_output.c err = tcp_write_wakeup(sk); tcp_write_wakeup 511 net/ipv4/tcp_timer.c if (tcp_write_wakeup(sk) <= 0) {