forked from Minki/linux
47da8ee681
While debugging a TCP server hang issue, we noticed that currently there is no way for a user to get the acceptq backlog value for a TCP listen socket. All the standard networking utilities that display socket info like netstat, ss and /proc/net/tcp have 2 fields called rx_queue and tx_queue. These fields do not mean much for listening sockets. This patch uses one of these unused fields(rx_queue) to export the accept queue len for listening sockets. Signed-off-by: Sridhar Samudrala <sri@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
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* tcp_diag.c Module for monitoring TCP transport protocols sockets.
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*
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* Version: $Id: tcp_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/inet_diag.h>
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#include <linux/tcp.h>
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#include <net/tcp.h>
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static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
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void *_info)
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{
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const struct tcp_sock *tp = tcp_sk(sk);
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struct tcp_info *info = _info;
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if (sk->sk_state == TCP_LISTEN)
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r->idiag_rqueue = sk->sk_ack_backlog;
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else
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r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq;
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r->idiag_wqueue = tp->write_seq - tp->snd_una;
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if (info != NULL)
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tcp_get_info(sk, info);
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}
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static struct inet_diag_handler tcp_diag_handler = {
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.idiag_hashinfo = &tcp_hashinfo,
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.idiag_get_info = tcp_diag_get_info,
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.idiag_type = TCPDIAG_GETSOCK,
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.idiag_info_size = sizeof(struct tcp_info),
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};
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static int __init tcp_diag_init(void)
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{
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return inet_diag_register(&tcp_diag_handler);
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}
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static void __exit tcp_diag_exit(void)
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{
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inet_diag_unregister(&tcp_diag_handler);
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}
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module_init(tcp_diag_init);
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module_exit(tcp_diag_exit);
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MODULE_LICENSE("GPL");
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