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further work on faster loop

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pull/5/merge
David Schweikert 13 years ago
parent 57650049fb
commit fdae03d016
1 changed files with 197 additions and 207 deletions
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382
fping.c
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@ -11,20 +11,21 @@
* It is highly recommended that your editor is set to this
* tab stop setting for viewing and editing.
*
* fping website: http://www.fping.com
* fping website: http://www.fping.org
*
*
*
* Current maintainers of fping:
*
* David Papp
* Suggestions and patches, please email david@remote.net
* David Schweikert
* Please send suggestions and patches to: david@schweikert.ch
*
*
*
* Original author: Roland Schemers <schemers@stanford.edu>
* IPv6 Support: Jeroen Massar <jeroen@unfix.org / jeroen@ipng.nl>
* Bugfixes, byte order & senseful seq.-numbers: Stephan Fuhrmann (stephan.fuhrmann AT 1und1.de)
* Improved main loop: David Schweikert <david@schweikert.ch>
*
*
* RCS header information no longer used. It has been moved to the
@ -230,12 +231,17 @@ char *icmp_unreach_str[16] =
/* entry used to keep track of each host we are pinging */
#define EV_TYPE_PING 1
#define EV_TYPE_TIMEOUT 2
typedef struct host_entry
{
struct host_entry *prev,*next; /* double linked list */
struct host_entry *sq_prev; /* double linked list for the send-queue */
struct host_entry *sq_next; /* double linked list for the send-queue */
struct timeval sq_send_time; /* can't send before this time */
/* Each host can have an event attached: either the next time that a ping needs
* to be sent, or the timeout, if the last ping was sent */
struct host_entry *ev_prev; /* double linked list for the event-queue */
struct host_entry *ev_next; /* double linked list for the event-queue */
struct timeval ev_time; /* time, after which this event should happen */
int ev_type; /* event type */
int i; /* index into array */
char *name; /* name as given by user */
@ -266,14 +272,12 @@ typedef struct host_entry
HOST_ENTRY *rrlist = NULL; /* linked list of hosts be pinged */
HOST_ENTRY **table = NULL; /* array of pointers to items in the list */
HOST_ENTRY *cursor;
/* send queue (sq): hosts in this list are ready for a new ping to be sent */
/* the inter-ping interval must be respected when going through this list */
/* and sending the pings. However, the per-host interval (-p), doesn't need */
/* to be considered (the host is not here, if that interval didn't pass */
HOST_ENTRY *sq_first;
HOST_ENTRY *sq_last;
/* event queue (ev): This, together with the ev_next / ev_prev elements are used
* to track the next event happening for each host. This can be either a new ping
* that needs to be sent or a timeout */
HOST_ENTRY *ev_first;
HOST_ENTRY *ev_last;
char *prog;
int ident; /* our pid */
@ -358,6 +362,7 @@ long timeval_diff();
void print_per_system_stats();
void print_per_system_splits();
void print_global_stats();
void main_loop();
void finish();
int handle_random_icmp();
char *sprint_tm();
@ -387,12 +392,13 @@ int wait_for_reply( u_int );
void print_per_system_stats( void );
void print_per_system_splits( void );
void print_global_stats( void );
void main_loop();
void finish();
int handle_random_icmp( FPING_ICMPHDR *p, int psize, FPING_SOCKADDR *addr );
char *sprint_tm( int t );
void sq_enqueue(HOST_ENTRY *h);
HOST_ENTRY *sq_dequeue();
void sq_remove(HOST_ENTRY *h);
void ev_enqueue(HOST_ENTRY *h);
HOST_ENTRY *ev_dequeue();
void ev_remove(HOST_ENTRY *h);
#endif /* _NO_PROTO */
@ -423,7 +429,6 @@ int main( int argc, char **argv )
#ifdef IPV6
int opton = 1;
#endif
u_int lt, ht;
struct protoent *proto;
char *buf;
uid_t uid;
@ -432,6 +437,8 @@ int main( int argc, char **argv )
#else
struct sockaddr_in6 sa;
#endif
HOST_ENTRY *cursor;
/* check if we are root */
if( geteuid() )
@ -1064,7 +1071,7 @@ int main( int argc, char **argv )
if( !table )
crash_and_burn( "Can't malloc array of hosts" );
cursor = rrlist;
cursor = ev_first;
for( num_jobs = 0; num_jobs < num_hosts; num_jobs++ )
{
@ -1087,7 +1094,7 @@ int main( int argc, char **argv )
}/* IF */
cursor=cursor->next;
cursor=cursor->ev_next;
}/* FOR */
@ -1108,125 +1115,128 @@ int main( int argc, char **argv )
srandom( start_time.tv_usec );
#endif /* DEBUG || _DEBUG */
cursor = rrlist;
/* main loop */
main_loop();
finish();
return 0;
} /* main() */
while( num_jobs )
void main_loop()
{
/* send any pings that need sending */
if(sq_first) {
#if defined( DEBUG ) || defined( _DEBUG )
if( trace_flag ) {
long st = timeval_diff(&sq_first->sq_send_time, &current_time);
fprintf(stderr, "next ping in %d ms (%s)\n", st / 100, sq_first->host);
}
#endif
u_int lt;
long wait_time;
HOST_ENTRY *h;
if(sq_first->sq_send_time.tv_sec < current_time.tv_sec ||
(sq_first->sq_send_time.tv_sec == current_time.tv_sec &&
sq_first->sq_send_time.tv_usec < current_time.tv_usec))
while(ev_first) {
/* Any event that can be processed now ? */
if(ev_first->ev_time.tv_sec < current_time.tv_sec ||
(ev_first->ev_time.tv_sec == current_time.tv_sec &&
ev_first->ev_time.tv_usec < current_time.tv_usec))
{
/* Event type: ping */
if(ev_first->ev_type == EV_TYPE_PING) {
/* Make sure that we don't ping more than once every "interval" */
lt = timeval_diff( &current_time, &last_send_time );
if(lt > interval) {
HOST_ENTRY *h;
h = sq_dequeue();
if(lt < interval) goto wait_for_reply;
/* Dequeue the event */
h = ev_dequeue();
/* Send the ping */
if(!send_ping(s, h)) goto wait_for_reply;
if(send_ping(s, h)) {
/* schedule retry */
if(!loop_flag && !count_flag && h->waiting < retry + 1) {
h->sq_send_time.tv_sec = current_time.tv_sec;
h->sq_send_time.tv_usec = current_time.tv_usec;
timeval_add(&h->sq_send_time, h->timeout);
sq_enqueue(h);
/* Check what needs to be done next */
if(!loop_flag && !count_flag) {
/* Normal mode: schedule retry */
if(h->waiting < retry + 1) {
h->ev_type = EV_TYPE_PING;
h->ev_time.tv_sec = current_time.tv_sec;
h->ev_time.tv_usec = current_time.tv_usec;
timeval_add(&h->ev_time, h->timeout);
ev_enqueue(h);
if(backoff_flag) {
h->timeout *= backoff;
}
}
/* schedule next ping */
else if(loop_flag ||
(count_flag && h->num_sent < count))
{
h->sq_send_time.tv_sec = current_time.tv_sec;
h->sq_send_time.tv_usec = current_time.tv_usec;
timeval_add(&h->sq_send_time, perhost_interval);
sq_enqueue(h);
/* Normal mode: schedule timeout for last retry */
else {
h->ev_type = EV_TYPE_TIMEOUT;
h->ev_time.tv_sec = current_time.tv_sec;
h->ev_time.tv_usec = current_time.tv_usec;
timeval_add(&h->ev_time, h->timeout);
ev_enqueue(h);
}
}
/* Loop and count mode: schedule next ping */
else if(loop_flag || (count_flag && h->num_sent < count))
{
h->ev_type = EV_TYPE_PING;
h->ev_time.tv_sec = current_time.tv_sec;
h->ev_time.tv_usec = current_time.tv_usec;
timeval_add(&h->ev_time, perhost_interval);
ev_enqueue(h);
}
/* Count mode: schedule timeout after last ping */
else if(count_flag && count_flag && h->num_sent >= count) {
h->ev_type = EV_TYPE_TIMEOUT;
h->ev_time.tv_sec = current_time.tv_sec;
h->ev_time.tv_usec = current_time.tv_usec;
timeval_add(&h->ev_time, h->timeout);
ev_enqueue(h);
}
}
/* receive replies */
if( num_pingsent ) {
if(wait_for_reply(interval)) {
while(wait_for_reply(0)); /* process other replies in the queue */
else if(ev_first->ev_type == EV_TYPE_TIMEOUT) {
num_timeout++;
remove_job(ev_first);
}
}
gettimeofday( &current_time, &tz );
ht = timeval_diff( &current_time, &cursor->last_send_time );
/* print report */
if( report_interval && ( loop_flag || count_flag ) &&
( timeval_diff ( &current_time, &last_report_time ) > report_interval ) )
{
print_per_system_splits();
last_report_time = current_time;
wait_for_reply:
/* When can we expect the next event? */
if(ev_first) {
if(ev_first->ev_time.tv_sec == 0) {
wait_time = interval;
}
else {
wait_time = timeval_diff(&ev_first->ev_time, &current_time);
if(wait_time < (long) interval) {
wait_time = interval;
}
}
#if defined( DEBUG ) || defined( _DEBUG )
if( trace_flag )
{
printf(
"main loop:\n [%s, wait/run/sent/recv/timeout = %u/%u/%u/%u/%u], jobs/ht = %u/%u\n",
cursor->host, cursor->waiting, cursor->running, cursor->num_sent,
cursor->num_recv, cursor->timeout, num_jobs, ht );
if( trace_flag ) {
fprintf(stderr, "next event in %d ms (%s)\n", wait_time / 100, ev_first->host);
}
#endif
/* check if timeout reached */
if(count_flag)
{
while(cursor &&
ht > cursor->timeout &&
cursor->num_sent >= count)
{
num_timeout++;
remove_job(cursor);
if(cursor) {
ht = timeval_diff( &current_time, &cursor->last_send_time );
}
else {
wait_time = interval;
}
/* Receive replies */
/* (this is what sleeps during each loop iteration) */
if(wait_for_reply(wait_time)) {
while(wait_for_reply(0)); /* process other replies in the queue */
}
else if(!loop_flag)
{
while(cursor &&
ht > cursor->timeout &&
cursor->waiting >= retry + 1)
gettimeofday( &current_time, &tz );
/* Print report */
if( report_interval && ( loop_flag || count_flag ) &&
( timeval_diff ( &current_time, &last_report_time ) > report_interval ) )
{
num_timeout++;
remove_job( cursor );
if(cursor) {
ht = timeval_diff( &current_time, &cursor->last_send_time );
}
print_per_system_splits();
last_report_time = current_time;
}
}
/* we use the cursor to go through all running jobs and check for timeouts */
if(cursor) {
cursor = cursor->next;
fprintf(stderr, "No further events\n");
}
}
finish();
return 0;
} /* main() */
/************************************************************
@ -2405,26 +2415,11 @@ void add_addr( char *name, char *host, FPING_SOCKADDR *ipaddr )
}/* IF */
#endif /* DEBUG || _DEBUG */
if( !rrlist )
{
rrlist = p;
p->next = p;
p->prev = p;
}/* IF */
else
{
p->next = rrlist;
p->prev = rrlist->prev;
p->prev->next = p;
p->next->prev = p;
}/* ELSE */
/* send queue */
p->sq_send_time.tv_sec = 0;
p->sq_send_time.tv_usec = 0;
sq_enqueue(p);
/* schedule first ping */
p->ev_type = EV_TYPE_PING;
p->ev_time.tv_sec = 0;
p->ev_time.tv_usec = 0;
ev_enqueue(p);
num_hosts++;
@ -2459,23 +2454,7 @@ void remove_job( HOST_ENTRY *h )
h->waiting = 0;
--num_jobs;
if( num_jobs )
{
/* remove us from list of active jobs */
h->prev->next = h->next;
h->next->prev = h->prev;
if( h==cursor )
cursor = h->next;
}
else
{
cursor = NULL;
rrlist = NULL;
}
sq_remove(h);
ev_remove(h);
} /* remove_job() */
@ -2633,13 +2612,14 @@ struct timeval *a, *b;
long timeval_diff( struct timeval *a, struct timeval *b )
#endif /* _NO_PROTO */
{
double temp;
temp = ( ( ( a->tv_sec * 1000000 ) + a->tv_usec ) -
( ( b->tv_sec * 1000000 ) + b->tv_usec ) ) / 10;
return ( long )temp;
long sec_diff = a->tv_sec - b->tv_sec;
if(sec_diff > 100) {
/* For such large differences, we don't really care about the microseconds... */
return sec_diff * 100000;
}
else {
return (sec_diff * 1000000 + a->tv_usec - b->tv_usec) / 10;
}
} /* timeval_diff() */
/************************************************************
@ -2805,102 +2785,112 @@ int recvfrom_wto( int s, char *buf, int len, FPING_SOCKADDR *saddr, int timo )
/************************************************************
Function: sq_enqueue
Function: ev_enqueue
Enqueue a host that needs to be pinged, but not before the time
written in h->sq_send_time.
written in h->ev_time.
The queue is sorted, so that sq_first always points to the host
The queue is sorted, so that ev_first always points to the host
that should be pinged first.
We start scanning the queue from the tail, because we assume
that new events mostly get inserted with a event time higher
than the others.
*************************************************************/
void sq_enqueue(HOST_ENTRY *h)
void ev_enqueue(HOST_ENTRY *h)
{
HOST_ENTRY *i;
HOST_ENTRY *i_next;
HOST_ENTRY *i_prev;
h->sq_next = NULL;
#if defined( DEBUG ) || defined( _DEBUG )
if( trace_flag ) {
long st = timeval_diff(&h->ev_time, &current_time);
fprintf(stderr, "Enqueue: host=%s, when=%d ms (%d, %d)\n", h->host, st/100, h->ev_time.tv_sec, h->ev_time.tv_usec);
}
#endif
/* Empty list */
if(sq_first == NULL) {
h->sq_prev = NULL;
sq_first = h;
sq_last = h;
if(ev_last == NULL) {
h->ev_next = NULL;
h->ev_prev = NULL;
ev_first = h;
ev_last = h;
return;
}
/* Insert on head? */
if(h->sq_send_time.tv_sec < sq_first->sq_send_time.tv_sec ||
(h->sq_send_time.tv_sec == sq_first->sq_send_time.tv_sec &&
h->sq_send_time.tv_usec <= sq_first->sq_send_time.tv_usec))
/* Insert on tail? */
if(h->ev_time.tv_sec > ev_last->ev_time.tv_sec ||
(h->ev_time.tv_sec == ev_last->ev_time.tv_sec &&
h->ev_time.tv_usec >= ev_last->ev_time.tv_usec))
{
h->sq_prev = NULL;
h->sq_next = sq_first;
sq_first = h;
h->ev_next = NULL;
h->ev_prev = ev_last;
ev_last->ev_next = h;
ev_last = h;
return;
}
/* Find insertion point */
i = sq_first;
i = ev_last;
while(1) {
i_next = i->sq_next;
if(i_next == NULL ||
h->sq_send_time.tv_sec < i_next->sq_send_time.tv_sec ||
(h->sq_send_time.tv_sec == i_next->sq_send_time.tv_sec &&
h->sq_send_time.tv_usec < i_next->sq_send_time.tv_usec))
{
h->sq_prev = i;
h->sq_next = i_next;
i->sq_next = h;
if(i_next != NULL) {
i_next->sq_prev = h;
i_prev = i->ev_prev;
if(i_prev == NULL ||
h->ev_time.tv_sec > i_prev->ev_time.tv_sec ||
(h->ev_time.tv_sec == i_prev->ev_time.tv_sec &&
h->ev_time.tv_usec >= i_prev->ev_time.tv_usec))
{
h->ev_prev = i_prev;
h->ev_next = i;
i->ev_prev = h;
if(i_prev != NULL) {
i_prev->ev_next = h;
}
else {
sq_last = h;
ev_first = h;
}
return;
}
i = i_next;
i = i_prev;
}
}
/************************************************************
Function: sq_dequeue
Function: ev_dequeue
*************************************************************/
HOST_ENTRY *sq_dequeue()
HOST_ENTRY *ev_dequeue()
{
HOST_ENTRY *dequeued;
if(sq_first == NULL) {
if(ev_first == NULL) {
return NULL;
}
dequeued = sq_first;
sq_remove(dequeued);
dequeued = ev_first;
ev_remove(dequeued);
return dequeued;
}
/************************************************************
Function: sq_remove
Function: ev_remove
*************************************************************/
void sq_remove(HOST_ENTRY *h)
void ev_remove(HOST_ENTRY *h)
{
if(sq_first == h) {
sq_first = h->sq_next;
if(ev_first == h) {
ev_first = h->ev_next;
}
if(sq_last == h) {
sq_last = h->sq_prev;
if(ev_last == h) {
ev_last = h->ev_prev;
}
if(h->sq_prev) {
h->sq_prev->sq_next = h->sq_next;
if(h->ev_prev) {
h->ev_prev->ev_next = h->ev_next;
}
if(h->sq_next) {
h->sq_next->sq_prev = h->sq_prev;
if(h->ev_next) {
h->ev_next->ev_prev = h->ev_prev;
}
}

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