this post was submitted on 21 Sep 2023

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Linux Questions

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Where does the Linux uptime command get its data? (self.linuxquestions)

submitted 1 year ago by possiblylinux127 to c/linuxquestions

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Does it get the uptime of pid 1 or something else?

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[–] [email protected] 7 points 1 year ago

https://github.com/coreutils/coreutils/blob/master/src/uptime.c

From utmp

https://github.com/gagern/gnulib/blob/master/lib/readutmp.h

https://en.wikipedia.org/wiki/Utmp

[–] [email protected] 3 points 1 year ago

I believe it comes from this: https://man7.org/linux/man-pages/man5/utmp.5.html

You can always check the code: https://github.com/coreutils/coreutils/blob/master/src/uptime.c