Add reconnect code to librumpclient. In case the connection to
the kernel server is lost, the client will now automatically attempt to reconnect. Among other things, this makes it possible to "reboot" and restart the TCP/IP stack from under firefox without any perceivable less of service. If pages were loading at the time the TCP/IP server was killed, there may be some broken links, but nothing a ctrl-r cannot fix.
This commit is contained in:
pooka
parent
0600fed083
commit
19a57922d0
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@ -1,4 +1,4 @@
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/* $NetBSD: rumpclient.c,v 1.17 2011/01/21 10:43:33 pooka Exp $ */
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/* $NetBSD: rumpclient.c,v 1.18 2011/01/24 17:47:51 pooka Exp $ */
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/*
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* Copyright (c) 2010, 2011 Antti Kantee. All Rights Reserved.
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@ -50,6 +50,7 @@ __RCSID("$NetBSD");
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#include <pthread.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@ -78,19 +79,51 @@ static struct spclient clispc = {
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.spc_fd = -1,
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};
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static int kq;
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static int kq = -1;
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static sigset_t fullset;
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static int doconnect(int);
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static int handshake_req(struct spclient *, uint32_t *, int, bool);
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int didrecon;
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static int
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waitresp(struct spclient *spc, struct respwait *rw, sigset_t *mask)
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send_with_recon(struct spclient *spc, const void *data, size_t dlen)
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{
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int rv;
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do {
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rv = dosend(spc, data, dlen);
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if (__predict_false(rv == ENOTCONN || rv == EBADF)) {
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if ((rv = doconnect(1)) != 0)
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continue;
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if ((rv = handshake_req(&clispc, NULL, 0, true)) != 0)
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continue;
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rv = ENOTCONN;
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break;
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}
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} while (__predict_false(rv != 0));
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return rv;
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}
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static int
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cliwaitresp(struct spclient *spc, struct respwait *rw, sigset_t *mask,
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bool keeplock)
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{
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uint64_t mygen;
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bool imalive = true;
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pthread_mutex_lock(&spc->spc_mtx);
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sendunlockl(spc);
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if (!keeplock)
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sendunlockl(spc);
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mygen = spc->spc_generation;
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rw->rw_error = 0;
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while (!rw->rw_done && rw->rw_error == 0
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&& spc->spc_state != SPCSTATE_DYING){
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while (!rw->rw_done && rw->rw_error == 0) {
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if (__predict_false(spc->spc_generation != mygen || !imalive))
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break;
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/* are we free to receive? */
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if (spc->spc_istatus == SPCSTATUS_FREE) {
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struct kevent kev[8];
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@ -105,7 +138,16 @@ waitresp(struct spclient *spc, struct respwait *rw, sigset_t *mask)
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case 0:
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rv = host_kevent(kq, NULL, 0,
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kev, __arraycount(kev), NULL);
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assert(rv > 0);
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/*
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* XXX: don't know how this can
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* happen (timeout cannot expire
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* since there isn't one), but
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* it does happen
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*/
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if (__predict_false(rv == 0))
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continue;
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for (i = 0; i < rv; i++) {
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if (kev[i].filter
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== EVFILT_SIGNAL)
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@ -116,7 +158,7 @@ waitresp(struct spclient *spc, struct respwait *rw, sigset_t *mask)
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continue;
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case -1:
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spc->spc_state = SPCSTATE_DYING;
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imalive = false;
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goto cleanup;
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default:
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break;
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@ -160,12 +202,12 @@ waitresp(struct spclient *spc, struct respwait *rw, sigset_t *mask)
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pthread_mutex_unlock(&spc->spc_mtx);
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pthread_cond_destroy(&rw->rw_cv);
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if (spc->spc_state == SPCSTATE_DYING)
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if (spc->spc_generation != mygen || !imalive) {
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return ENOTCONN;
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}
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return rw->rw_error;
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}
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static int
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syscall_req(struct spclient *spc, int sysnum,
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const void *data, size_t dlen, void **resp)
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@ -182,18 +224,18 @@ syscall_req(struct spclient *spc, int sysnum,
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pthread_sigmask(SIG_SETMASK, &fullset, &omask);
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do {
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putwait(spc, &rw, &rhdr);
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rv = dosend(spc, &rhdr, sizeof(rhdr));
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rv = dosend(spc, data, dlen);
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if (rv) {
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if ((rv = send_with_recon(spc, &rhdr, sizeof(rhdr))) != 0) {
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unputwait(spc, &rw);
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pthread_sigmask(SIG_SETMASK, &omask, NULL);
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return rv;
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continue;
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}
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if ((rv = send_with_recon(spc, data, dlen)) != 0) {
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unputwait(spc, &rw);
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continue;
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}
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rv = waitresp(spc, &rw, &omask);
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} while (rv == EAGAIN);
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rv = cliwaitresp(spc, &rw, &omask, false);
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} while (rv == ENOTCONN || rv == EAGAIN);
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pthread_sigmask(SIG_SETMASK, &omask, NULL);
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*resp = rw.rw_data;
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@ -201,7 +243,7 @@ syscall_req(struct spclient *spc, int sysnum,
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}
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static int
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handshake_req(struct spclient *spc, uint32_t *auth, int cancel)
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handshake_req(struct spclient *spc, uint32_t *auth, int cancel, bool haslock)
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{
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struct handshake_fork rf;
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struct rsp_hdr rhdr;
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@ -219,20 +261,28 @@ handshake_req(struct spclient *spc, uint32_t *auth, int cancel)
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rhdr.rsp_handshake = HANDSHAKE_GUEST;
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pthread_sigmask(SIG_SETMASK, &fullset, &omask);
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putwait(spc, &rw, &rhdr);
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if (haslock)
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putwait_locked(spc, &rw, &rhdr);
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else
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putwait(spc, &rw, &rhdr);
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rv = dosend(spc, &rhdr, sizeof(rhdr));
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if (auth) {
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memcpy(rf.rf_auth, auth, AUTHLEN*sizeof(*auth));
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rf.rf_cancel = cancel;
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rv = dosend(spc, &rf, sizeof(rf));
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rv = send_with_recon(spc, &rf, sizeof(rf));
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}
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if (rv != 0 || cancel) {
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unputwait(spc, &rw);
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pthread_sigmask(SIG_SETMASK, &omask, NULL);
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return rv;
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if (rv || cancel) {
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if (haslock)
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unputwait_locked(spc, &rw);
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else
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unputwait(spc, &rw);
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if (cancel) {
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pthread_sigmask(SIG_SETMASK, &omask, NULL);
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return rv;
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}
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} else {
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rv = cliwaitresp(spc, &rw, &omask, haslock);
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}
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rv = waitresp(spc, &rw, &omask);
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pthread_sigmask(SIG_SETMASK, &omask, NULL);
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if (rv)
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return rv;
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@ -257,26 +307,51 @@ prefork_req(struct spclient *spc, void **resp)
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rhdr.rsp_error = 0;
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pthread_sigmask(SIG_SETMASK, &fullset, &omask);
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putwait(spc, &rw, &rhdr);
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rv = dosend(spc, &rhdr, sizeof(rhdr));
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if (rv != 0) {
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unputwait(spc, &rw);
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pthread_sigmask(SIG_SETMASK, &omask, NULL);
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return rv;
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}
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do {
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putwait(spc, &rw, &rhdr);
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rv = send_with_recon(spc, &rhdr, sizeof(rhdr));
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if (rv != 0) {
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unputwait(spc, &rw);
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continue;
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}
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rv = waitresp(spc, &rw, &omask);
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rv = cliwaitresp(spc, &rw, &omask, false);
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} while (rv == ENOTCONN || rv == EAGAIN);
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pthread_sigmask(SIG_SETMASK, &omask, NULL);
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*resp = rw.rw_data;
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return rv;
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}
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/*
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* prevent response code from deadlocking with reconnect code
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*/
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static int
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resp_sendlock(struct spclient *spc)
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{
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int rv = 0;
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pthread_mutex_lock(&spc->spc_mtx);
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while (spc->spc_ostatus != SPCSTATUS_FREE) {
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if (__predict_false(spc->spc_reconnecting)) {
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rv = EBUSY;
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goto out;
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}
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spc->spc_ostatus = SPCSTATUS_WANTED;
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pthread_cond_wait(&spc->spc_cv, &spc->spc_mtx);
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}
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spc->spc_ostatus = SPCSTATUS_BUSY;
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out:
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pthread_mutex_unlock(&spc->spc_mtx);
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return rv;
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}
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static void
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send_copyin_resp(struct spclient *spc, uint64_t reqno, void *data, size_t dlen,
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int wantstr)
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{
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struct rsp_hdr rhdr;
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int rv;
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if (wantstr)
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dlen = MIN(dlen, strlen(data)+1);
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@ -287,19 +362,17 @@ send_copyin_resp(struct spclient *spc, uint64_t reqno, void *data, size_t dlen,
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rhdr.rsp_type = RUMPSP_COPYIN;
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rhdr.rsp_sysnum = 0;
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sendlock(spc);
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rv = dosend(spc, &rhdr, sizeof(rhdr));
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rv = dosend(spc, data, dlen);
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if (resp_sendlock(spc) != 0)
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return;
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(void)dosend(spc, &rhdr, sizeof(rhdr));
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(void)dosend(spc, data, dlen);
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sendunlock(spc);
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return rv;
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}
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static int
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static void
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send_anonmmap_resp(struct spclient *spc, uint64_t reqno, void *addr)
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{
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struct rsp_hdr rhdr;
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int rv;
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rhdr.rsp_len = sizeof(rhdr) + sizeof(addr);
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rhdr.rsp_reqno = reqno;
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@ -307,12 +380,11 @@ send_anonmmap_resp(struct spclient *spc, uint64_t reqno, void *addr)
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rhdr.rsp_type = RUMPSP_ANONMMAP;
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rhdr.rsp_sysnum = 0;
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sendlock(spc);
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rv = dosend(spc, &rhdr, sizeof(rhdr));
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rv = dosend(spc, &addr, sizeof(addr));
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if (resp_sendlock(spc) != 0)
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return;
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(void)dosend(spc, &rhdr, sizeof(rhdr));
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(void)dosend(spc, &addr, sizeof(addr));
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sendunlock(spc);
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return rv;
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}
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int
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@ -383,7 +455,7 @@ handlereq(struct spclient *spc)
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break;
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case RUMPSP_RAISE:
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DPRINTF(("rump_sp handlereq: raise sig %d\n", rhdr->rsp_signo));
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raise(rhdr->rsp_signo);
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raise((int)rhdr->rsp_signo);
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/*
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* We most likely have signals blocked, but the signal
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* will be handled soon enough when we return.
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@ -402,22 +474,92 @@ static unsigned ptab_idx;
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static struct sockaddr *serv_sa;
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static int
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doconnect(void)
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doconnect(int retry)
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{
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time_t prevreconmsg;
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unsigned reconretries;
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struct respwait rw;
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struct rsp_hdr rhdr;
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struct kevent kev[NSIG+1];
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char banner[MAXBANNER];
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struct pollfd pfd;
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int s, error, flags, i;
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ssize_t n;
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if (kq != -1)
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host_close(kq);
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kq = -1;
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prevreconmsg = 0;
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reconretries = 0;
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again:
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if (clispc.spc_fd != -1)
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host_close(clispc.spc_fd);
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clispc.spc_fd = -1;
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/*
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* for reconnect, gate everyone out of the receiver code
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*/
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putwait_locked(&clispc, &rw, &rhdr);
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pthread_mutex_lock(&clispc.spc_mtx);
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clispc.spc_reconnecting = 1;
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pthread_cond_broadcast(&clispc.spc_cv);
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clispc.spc_generation++;
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while (clispc.spc_istatus != SPCSTATUS_FREE) {
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clispc.spc_istatus = SPCSTATUS_WANTED;
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pthread_cond_wait(&rw.rw_cv, &clispc.spc_mtx);
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}
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kickall(&clispc);
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/*
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* we can release it already since we hold the
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* send lock during reconnect
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* XXX: assert it
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*/
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clispc.spc_istatus = SPCSTATUS_FREE;
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pthread_mutex_unlock(&clispc.spc_mtx);
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unputwait_locked(&clispc, &rw);
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free(clispc.spc_buf);
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clispc.spc_off = 0;
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s = host_socket(parsetab[ptab_idx].domain, SOCK_STREAM, 0);
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if (s == -1)
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return -1;
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if (host_connect(s, serv_sa, (socklen_t)serv_sa->sa_len) == -1) {
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error = errno;
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fprintf(stderr, "rump_sp: client connect failed\n");
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errno = error;
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return -1;
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pfd.fd = s;
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pfd.events = POLLIN;
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while (host_connect(s, serv_sa, (socklen_t)serv_sa->sa_len) == -1) {
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if (errno == EINTR)
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continue;
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if (!retry) {
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error = errno;
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fprintf(stderr, "rump_sp: client connect failed: %s\n",
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strerror(errno));
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errno = error;
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return -1;
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}
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if (prevreconmsg == 0) {
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fprintf(stderr, "rump_sp: connection to kernel lost, "
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"trying to reconnect ...\n");
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prevreconmsg = time(NULL);
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}
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if (time(NULL) - prevreconmsg > 120) {
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fprintf(stderr, "rump_sp: still trying to "
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"reconnect ...\n");
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prevreconmsg = time(NULL);
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}
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/* adhoc backoff timer */
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if (reconretries++ < 10) {
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usleep(100000 * reconretries);
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} else {
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sleep(MIN(10, reconretries-9));
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}
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goto again;
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}
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if ((error = parsetab[ptab_idx].connhook(s)) != 0) {
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@ -440,15 +582,22 @@ doconnect(void)
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return -1;
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}
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banner[n] = '\0';
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/* parse the banner some day */
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flags = host_fcntl(s, F_GETFL, 0);
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if (host_fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) {
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fprintf(stderr, "rump_sp: cannot set socket fd to nonblock\n");
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fprintf(stderr, "rump_sp: socket fd NONBLOCK: %s\n",
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strerror(errno));
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errno = EINVAL;
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return -1;
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}
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clispc.spc_fd = s;
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clispc.spc_state = SPCSTATE_RUNNING;
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clispc.spc_reconnecting = 0;
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/* parse the banner some day */
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if (prevreconmsg) {
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fprintf(stderr, "rump_sp: reconnected!\n");
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}
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/* setup kqueue, we want all signals and the fd */
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if ((kq = host_kqueue()) == -1) {
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@ -461,7 +610,8 @@ doconnect(void)
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for (i = 0; i < NSIG; i++) {
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EV_SET(&kev[i], i+1, EVFILT_SIGNAL, EV_ADD|EV_ENABLE, 0, 0, 0);
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}
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EV_SET(&kev[NSIG], s, EVFILT_READ, EV_ADD|EV_ENABLE, 0, 0, 0);
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EV_SET(&kev[NSIG], clispc.spc_fd,
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EVFILT_READ, EV_ADD|EV_ENABLE, 0, 0, 0);
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if (host_kevent(kq, kev, NSIG+1, NULL, 0, NULL) == -1) {
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error = errno;
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fprintf(stderr, "rump_sp: kevent() failed");
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@ -469,7 +619,13 @@ doconnect(void)
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return -1;
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}
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clispc.spc_fd = s;
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return 0;
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}
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static int
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doinit(void)
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{
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TAILQ_INIT(&clispc.spc_respwait);
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pthread_mutex_init(&clispc.spc_mtx, NULL);
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pthread_cond_init(&clispc.spc_cv, NULL);
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@ -521,14 +677,17 @@ rumpclient_init()
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return -1;
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}
|
||||
|
||||
if (doconnect() == -1)
|
||||
if (doinit() == -1)
|
||||
return -1;
|
||||
if (doconnect(0) == -1)
|
||||
return -1;
|
||||
|
||||
error = handshake_req(&clispc, NULL, 0);
|
||||
error = handshake_req(&clispc, NULL, 0, false);
|
||||
if (error) {
|
||||
pthread_mutex_destroy(&clispc.spc_mtx);
|
||||
pthread_cond_destroy(&clispc.spc_cv);
|
||||
host_close(clispc.spc_fd);
|
||||
if (clispc.spc_fd != -1)
|
||||
host_close(clispc.spc_fd);
|
||||
errno = error;
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -569,16 +728,16 @@ rumpclient_fork_init(struct rumpclient_fork *rpf)
|
|||
{
|
||||
int error;
|
||||
|
||||
host_close(clispc.spc_fd);
|
||||
host_close(kq);
|
||||
kq = -1;
|
||||
memset(&clispc, 0, sizeof(clispc));
|
||||
clispc.spc_fd = -1;
|
||||
kq = -1;
|
||||
|
||||
if (doconnect() == -1)
|
||||
if (doinit() == -1)
|
||||
return -1;
|
||||
if (doconnect(1) == -1)
|
||||
return -1;
|
||||
|
||||
error = handshake_req(&clispc, rpf->fork_auth, 0);
|
||||
error = handshake_req(&clispc, rpf->fork_auth, 0, false);
|
||||
if (error) {
|
||||
pthread_mutex_destroy(&clispc.spc_mtx);
|
||||
pthread_cond_destroy(&clispc.spc_cv);
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
/* $NetBSD: sp_common.c,v 1.25 2011/01/22 13:41:22 pooka Exp $ */
|
||||
/* $NetBSD: sp_common.c,v 1.26 2011/01/24 17:47:52 pooka Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright (c) 2010, 2011 Antti Kantee. All Rights Reserved.
|
||||
|
|
@ -177,7 +177,9 @@ struct spclient {
|
|||
|
||||
uint64_t spc_nextreq;
|
||||
uint64_t spc_syscallreq;
|
||||
uint64_t spc_generation;
|
||||
int spc_ostatus, spc_istatus;
|
||||
int spc_reconnecting;
|
||||
|
||||
LIST_HEAD(, prefork) spc_pflist;
|
||||
};
|
||||
|
|
@ -223,7 +225,7 @@ sendlockl(struct spclient *spc)
|
|||
spc->spc_ostatus = SPCSTATUS_BUSY;
|
||||
}
|
||||
|
||||
static void
|
||||
static void __unused
|
||||
sendlock(struct spclient *spc)
|
||||
{
|
||||
|
||||
|
|
@ -273,14 +275,16 @@ dosend(struct spclient *spc, const void *data, size_t dlen)
|
|||
|
||||
n = host_sendto(fd, sdata + sent, dlen - sent,
|
||||
MSG_NOSIGNAL, NULL, 0);
|
||||
if (n == 0) {
|
||||
return ENOTCONN;
|
||||
}
|
||||
if (n == -1) {
|
||||
if (errno == EPIPE)
|
||||
return ENOTCONN;
|
||||
if (errno != EAGAIN)
|
||||
return errno;
|
||||
continue;
|
||||
}
|
||||
if (n == 0) {
|
||||
return ENOTCONN;
|
||||
}
|
||||
sent += n;
|
||||
}
|
||||
|
||||
|
|
@ -288,7 +292,7 @@ dosend(struct spclient *spc, const void *data, size_t dlen)
|
|||
}
|
||||
|
||||
static void
|
||||
putwait(struct spclient *spc, struct respwait *rw, struct rsp_hdr *rhdr)
|
||||
doputwait(struct spclient *spc, struct respwait *rw, struct rsp_hdr *rhdr)
|
||||
{
|
||||
|
||||
rw->rw_data = NULL;
|
||||
|
|
@ -298,11 +302,43 @@ putwait(struct spclient *spc, struct respwait *rw, struct rsp_hdr *rhdr)
|
|||
pthread_mutex_lock(&spc->spc_mtx);
|
||||
rw->rw_reqno = rhdr->rsp_reqno = spc->spc_nextreq++;
|
||||
TAILQ_INSERT_TAIL(&spc->spc_respwait, rw, rw_entries);
|
||||
}
|
||||
|
||||
static void __unused
|
||||
putwait_locked(struct spclient *spc, struct respwait *rw, struct rsp_hdr *rhdr)
|
||||
{
|
||||
|
||||
doputwait(spc, rw, rhdr);
|
||||
pthread_mutex_unlock(&spc->spc_mtx);
|
||||
}
|
||||
|
||||
static void
|
||||
putwait(struct spclient *spc, struct respwait *rw, struct rsp_hdr *rhdr)
|
||||
{
|
||||
|
||||
doputwait(spc, rw, rhdr);
|
||||
sendlockl(spc);
|
||||
pthread_mutex_unlock(&spc->spc_mtx);
|
||||
}
|
||||
|
||||
static void
|
||||
dounputwait(struct spclient *spc, struct respwait *rw)
|
||||
{
|
||||
|
||||
TAILQ_REMOVE(&spc->spc_respwait, rw, rw_entries);
|
||||
pthread_mutex_unlock(&spc->spc_mtx);
|
||||
pthread_cond_destroy(&rw->rw_cv);
|
||||
|
||||
}
|
||||
|
||||
static void __unused
|
||||
unputwait_locked(struct spclient *spc, struct respwait *rw)
|
||||
{
|
||||
|
||||
pthread_mutex_lock(&spc->spc_mtx);
|
||||
dounputwait(spc, rw);
|
||||
}
|
||||
|
||||
static void
|
||||
unputwait(struct spclient *spc, struct respwait *rw)
|
||||
{
|
||||
|
|
@ -310,9 +346,7 @@ unputwait(struct spclient *spc, struct respwait *rw)
|
|||
pthread_mutex_lock(&spc->spc_mtx);
|
||||
sendunlockl(spc);
|
||||
|
||||
TAILQ_REMOVE(&spc->spc_respwait, rw, rw_entries);
|
||||
pthread_mutex_unlock(&spc->spc_mtx);
|
||||
pthread_cond_destroy(&rw->rw_cv);
|
||||
dounputwait(spc, rw);
|
||||
}
|
||||
|
||||
static void
|
||||
|
|
|
|||
Loading…
Reference in New Issue