Compiling this on FreeBSD yields:

  CC      procps/ps.o
procps/ps.c: In function 'get_uptime':
procps/ps.c:86: warning: conversion lacks type at end of format
procps/ps.c:86: warning: too many arguments for format

and indeed the format string is "%l" (ell) - this was probably meant to be "%li", "%ld", "%lx", or "%lo" - please fix.


This would affect versions 1.20.2 and 1.21.0, and I have not checked older versions.

It does not matter much because FreeBSD does not have /proc/uptime, so the function errors out before reaching the bug.  On FreeBSD you get the uptime like this (see src/usr.bin/w/w.c):

 struct timespec tp;
 if (-1 != clock_gettime(CLOCK_MONOTONIC, &tp)) {
   /* process tp here */
 }