cregit-Linux how code gets into the kernel

Release 4.8 net/decnet/dn_timer.c

Directory: net/decnet
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *              DECnet Socket Timer Functions
 * Author:      Steve Whitehouse <>
 * Changes:
 *       Steve Whitehouse      : Made keepalive timer part of the same
 *                               timer idea.
 *       Steve Whitehouse      : Added checks for sk->sock_readers
 *       David S. Miller       : New socket locking
 *       Steve Whitehouse      : Timer grabs socket ref.
#include <linux/net.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <net/sock.h>
#include <linux/atomic.h>
#include <linux/jiffies.h>
#include <net/flow.h>
#include <net/dn.h>

 * Slow timer is for everything else (n * 500mS)

#define SLOW_INTERVAL (HZ/2)

static void dn_slow_timer(unsigned long arg);

void dn_start_slow_timer(struct sock *sk) { setup_timer(&sk->sk_timer, dn_slow_timer, (unsigned long)sk); sk_reset_timer(sk, &sk->sk_timer, jiffies + SLOW_INTERVAL); }


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void dn_stop_slow_timer(struct sock *sk) { sk_stop_timer(sk, &sk->sk_timer); }


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static void dn_slow_timer(unsigned long arg) { struct sock *sk = (struct sock *)arg; struct dn_scp *scp = DN_SK(sk); bh_lock_sock(sk); if (sock_owned_by_user(sk)) { sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 10); goto out; } /* * The persist timer is the standard slow timer used for retransmits * in both connection establishment and disconnection as well as * in the RUN state. The different states are catered for by changing * the function pointer in the socket. Setting the timer to a value * of zero turns it off. We allow the persist_fxn to turn the * timer off in a permant way by returning non-zero, so that * timer based routines may remove sockets. This is why we have a * sock_hold()/sock_put() around the timer to prevent the socket * going away in the middle. */ if (scp->persist && scp->persist_fxn) { if (scp->persist <= SLOW_INTERVAL) { scp->persist = 0; if (scp->persist_fxn(sk)) goto out; } else { scp->persist -= SLOW_INTERVAL; } } /* * Check for keepalive timeout. After the other timer 'cos if * the previous timer caused a retransmit, we don't need to * do this. scp->stamp is the last time that we sent a packet. * The keepalive function sends a link service packet to the * other end. If it remains unacknowledged, the standard * socket timers will eventually shut the socket down. Each * time we do this, scp->stamp will be updated, thus * we won't try and send another until scp->keepalive has passed * since the last successful transmission. */ if (scp->keepalive && scp->keepalive_fxn && (scp->state == DN_RUN)) { if (time_after_eq(jiffies, scp->stamp + scp->keepalive)) scp->keepalive_fxn(sk); } sk_reset_timer(sk, &sk->sk_timer, jiffies + SLOW_INTERVAL); out: bh_unlock_sock(sk); sock_put(sk); }


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Overall Contributors

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linus torvaldslinus torvalds31.03%18.33%
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Directory: net/decnet
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