RATECHECK(9) Kernel Developer's Manual RATECHECK(9) NAME ratecheck, ppsratecheck -- event rate limiting SYNOPSIS #include <sys/time.h> int ratecheck(struct timeval *lasttime, const struct timeval *mininterval); int ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps); DESCRIPTION The ratecheck and ppsratecheck functions facilitate rate-limiting of arbi- trary events. The former enforces a minimum interval between events while the latter enforces a maximum number of events per second. The ratecheck function compares the current time to the value pointed to by lasttime. If the difference is equal to or greater than mininterval, it returns a non-zero value and updates lasttime to the current time. Other- wise, it returns zero. The ppsratecheck function first compares the current time to lasttime. If at least a full second has passed, the value pointed to by the curpps argu- ment is reset to 1 and lasttime is updated to the current time. Otherwise, curpps is incremented and lasttime is left untouched. In either case, ppsratecheck returns a non-zero value if and only if the updated curpps is less than or equal to maxpps or maxpps is negative. SEE ALSO counter(9) HISTORY The ratecheck and ppsratecheck functions first appeared in FreeBSD 5.1. FreeBSD 15.1 March 11, 2022 RATECHECK(9)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY
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