cederom commented on issue #8858: URL: https://github.com/apache/nuttx/issues/8858#issuecomment-1478404539
Here are some references :-) https://github.com/freebsd/freebsd-src/blob/master/contrib/ntp/libntp/adjtime.c https://github.com/freebsd/freebsd-src/blob/master/contrib/ntp/include/ntp_syscall.h https://github.com/freebsd/freebsd-src/blob/main/sys/kern/kern_time.c And the man page :-) https://man.freebsd.org/cgi/man.cgi?query=adjtime&sektion=2&apropos=0&manpath=FreeBSD+13.1-RELEASE+and+Ports The adjtime() system call makes small adjustments to the system time, as returned by gettimeofday(2), advancing or retarding it by the time speci- fied by the timeval delta. If delta is negative, the clock is slowed down by incrementing it more slowly than normal until the correction is complete. If delta is positive, a larger increment than normal is used. The skew used to perform the correction is generally a fraction of one percent. Thus, the time is always a monotonically increasing function. A time correction from an earlier call to adjtime() may not be finished when adjtime() is called again. If olddelta is not a null pointer, the structure pointed to will contain, upon return, the number of microsec- onds still to be corrected from the earlier call. This call may be used by time servers that synchronize the clocks of com- puters in a local area network. Such time servers would slow down the clocks of some machines and speed up the clocks of others to bring them to the average network time. The adjtime() system call is restricted to the super-user. Hope that helps :-) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
