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o fix ppsratecheck to interpret a maxpps of zero as "ignore everything"

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o add a comment explaining the significance of using 0 or -1 (actually
  any negative value) for maxpps
This commit is contained in:
Sam Leffler 2003-02-26 17:16:38 +00:00
parent 832b6bd471
commit 893bec8059
1 changed files with 5 additions and 1 deletions
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6
sys/kern/kern_time.c
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@ -679,6 +679,10 @@ ratecheck(struct timeval *lasttime, const struct timeval *mininterval)
* Return 0 if the limit is to be enforced (e.g. the caller
* should drop a packet because of the rate limitation).
*
* maxpps of 0 always causes zero to be returned. maxpps of -1
* always causes 1 to be returned; this effectively defeats rate
* limiting.
*
* Note that we maintain the struct timeval for compatibility
* with other bsd systems. We reuse the storage and just monitor
* clock ticks for minimal overhead.
@ -697,7 +701,7 @@ ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps)
if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) {
lasttime->tv_sec = now;
*curpps = 1;
return (1);
return (maxpps != 0);
} else {
(*curpps)++; /* NB: ignore potential overflow */
return (maxpps < 0 || *curpps < maxpps);