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/*
* DCAP - dCache Access Protocol client interface
*
* Copyright (C) 2000,2004 DESY Hamburg DMG-Division.
*
* AUTHOR: Tigran Mkrtchayn (tigran.mkrtchyan@desy.de)
*
* This program can be distributed under the terms of the GNU LGPL.
* See the file COPYING.LIB
*
*/
/*
* $Id: dcap_reconnect.c,v 1.21 2004-11-01 19:33:29 tigran Exp $
*/
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#ifdef WIN32
# include "dcap_unix2win.h"
# include "dcap_win_poll.h"
#else
# include <sys/poll.h>
# include <unistd.h>
#endif
#include "dcap.h"
#include "dcap_functions.h"
#include "dcap_types.h"
#include "dcap_protocol.h"
#include "dcap_poll.h"
#include "socket_nio.h"
#include "sysdep.h"
#include "debug_level.h"
#include "dcap_reconnect.h"
/* Local function prototypes */
static int smart_reconnect(struct vsp_node *, int);
#ifndef WIN32
static void alarm_handler( int sig);
#endif
#ifdef _REENTRANT
static TKEY ioFailedKey;
static TKEY isAlarmKey;
static TKEY sa_alarmKey;
static int ioKeyOnce = 0;
static int alarmKeyOnce = 0;
static int saKeyOnce = 0;
static MUTEX(kLock);
#define isAlarm (*(__isAlarm()))
#define old_sa_alarm (*(__old_sa_alarm()))
/* Reentrant local function prototypes */
static int *__isAlarm();
static struct sigaction *__old_sa_alarm();
int *
__isIOFailed()
{
int *io;
m_lock(&kLock);
if(!ioKeyOnce) {
t_keycreate(&ioFailedKey, NULL);
++ioKeyOnce;
}
m_unlock(&kLock);
t_getspecific(ioFailedKey, &io);
if( io == NULL ) {
io = calloc(1, sizeof(int));
t_setspecific(ioFailedKey, (void *)io);
}
return io;
}
int *
__isAlarm()
{
int *al;
m_lock(&kLock);
if(!alarmKeyOnce) {
t_keycreate(&isAlarmKey, NULL);
++alarmKeyOnce;
}
m_unlock(&kLock);
t_getspecific(isAlarmKey, &al);
if( al == NULL ) {
al = calloc(1, sizeof(int));
t_setspecific(isAlarmKey, (void *)al);
}
return al;
}
struct sigaction *
__old_sa_alarm()
{
struct sigaction *sa;
m_lock(&kLock);
if(!saKeyOnce) {
t_keycreate(&sa_alarmKey, NULL);
++saKeyOnce;
}
m_unlock(&kLock);
t_getspecific(sa_alarmKey, &sa);
if( sa == NULL ) {
sa = calloc(1, sizeof(struct sigaction));
t_setspecific(sa_alarmKey, (void *)sa);
}
return sa;
}
#else
int isIOFailed = 0;
static int isAlarm = 0;
#ifndef WIN32
static struct sigaction old_sa_alarm;
#endif /* WIN32 */
#endif /* _REENTRANT */
int recover_connection(struct vsp_node * node, int mode)
{
char fail_message[64];
fail_message[0] = '\0';
sprintf(fail_message, "%d 1 client fail\n", node->queueID);
sendControlMessage(node->fd, fail_message, strlen(fail_message), node->tunnel);
return smart_reconnect(node, mode);
}
int
smart_reconnect(struct vsp_node * node, int mode)
{
int old_fd;
if(node->flags != O_RDONLY) {
return 1;
}
/* user uses data fd as file descriptor and we have to keep it unchanged */
old_fd = node->dataFd;
if(data_hello_conversation(node) < 0) {
dc_debug(DC_ERROR, "[%d] Failed to make a new data connection.", node->dataFd);
return 1;
}
/* try to get old fd in use */
node->dataFd = dup2(node->dataFd, old_fd);
if( node->dataFd != old_fd) {
node->dataFd = old_fd;
dc_debug(DC_ERROR, "dup2 failed. Reconnection impossible.");
return 1;
}
if(mode && !dc_set_pos(node, mode, -1)) {
dc_debug(DC_ERROR, "[%d] Failed to set correct position.", node->dataFd);
return 1;
}
dc_debug(DC_INFO, "[%d] Broken connection recovered.", node->dataFd);
return 0;
}
#ifndef WIN32
void alarm_handler( int sig)
{
dc_debug(DC_ERROR, "dcap: Last IO operation timeout.");
isIOFailed = 1;
isAlarm = 0;
/* set back old alarm handler */
sigaction(SIGALRM, &old_sa_alarm, NULL);
}
int dcap_set_alarm(unsigned int t)
{
struct sigaction sa_alarm;
struct sigaction *optr;
struct sigaction *ptr;
if(t) {
dc_debug(DC_TRACE, "Setting IO timeout to %d seconds.", t);
sa_alarm.sa_handler = alarm_handler;
sigemptyset(&sa_alarm.sa_mask);
sa_alarm.sa_flags = 0;
ptr = &sa_alarm;
optr = &old_sa_alarm;
/* reset the error flag */
isIOFailed = 0;
/* make a note, that alarm is set */
isAlarm = 1;
}else{
dc_debug(DC_TRACE, "Removing IO timeout handler.");
/* set the old interrupt handler */
/* do nothing if alarm not seted */
if( !isAlarm ) return 0;
ptr = &old_sa_alarm;
optr = NULL;
isAlarm = 0;
}
if (sigaction(SIGALRM, ptr, optr) < 0) {
dc_debug(DC_ERROR,"Sigaction failed!");
return 1;
}
alarm(t);
return 0;
}
#else
int dcap_set_alarm(unsigned int t)
{
return 0;
}
#endif /* WIN32 */
int ping_pong(struct vsp_node * node)
{
char ping[64];
int len;
asciiMessage *aM;
struct pollfd pfd;
int rc;
ping[0] = '\0';
len = sprintf(ping, "%d 2 client ping\n", node->queueID);
setNonBlocking(node->fd);
rc = sendControlMessage(node->fd, ping, len, node->tunnel);
clearNonBlocking(node->fd);
if( rc < 0 ) {
dc_debug(DC_ERROR, "Ping failed (control line down).");
return 0;
}
pfd.fd = node->fd;
pfd.events = POLLIN;
rc = poll(&pfd, 1, 1000*10); /* 10 seconds */
if((rc == 1) && (pfd.revents & POLLIN )) {
dcap_set_alarm(10);
aM = getControlMessage(HAVETO, node);
dcap_set_alarm(0);
if( (aM != NULL ) && (aM->type == ASCII_PING) ) {
free(aM->msg);
free(aM);
return 1;
}
}
dc_debug(DC_ERROR, "Ping failed.");
return 0;
}
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