boottime man page on FreeBSD

Man page or keyword search:  
man Server   9747 pages
apropos Keyword Search (all sections)
Output format
FreeBSD logo
[printable version]

TIME(9)			 BSD Kernel Developer's Manual		       TIME(9)

     boottime, time_second, time_uptime — system time variables

     #include <sys/time.h>

     extern struct timeval boottime;
     extern time_t time_second;
     extern time_t time_uptime;

     The boottime variable holds the system boot time.

     The time_second variable is the system's “wall time” clock to the second.

     The time_uptime variable is the number of seconds since boot.

     The bintime(9), getbintime(9), microtime(9), getmicrotime(9),
     nanotime(9), and getnanotime(9) functions can be used to get the current
     time more accurately and in an atomic manner.  Similarly, the
     binuptime(9), getbinuptime(9), microuptime(9), getmicrouptime(9),
     nanouptime(9), and getnanouptime(9) functions can be used to get the time
     elapse since boot more accurately and in an atomic manner.	 The boottime
     variable may be read and written without special precautions.

     clock_settime(2), ntp_adjtime(2), settimeofday(2), bintime(9),
     binuptime(9), getbintime(9), getbinuptime(9), getmicrotime(9),
     getmicrouptime(9), getnanotime(9), getnanouptime(9), microtime(9),
     microuptime(9), nanotime(9), nanouptime(9)

     Poul-Henning Kamp, "Timecounters: Efficient and precise timekeeping in
     SMP kernels", Proceedings of EuroBSDCon 2002, Amsterdam,

     Marshall Kirk McKusick and George V. Neville-Neil, The Design and
     Implementation of the FreeBSD Operating System, Addison-Wesley,
     57-61,65-66, July 2004.

BSD			      September 17, 2004			   BSD

List of man pages available for FreeBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net