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Fix jumpy usec values for kern.boottime
This was causing issues with Homebrew due to Ruby using `_mach_boottime_usec` (indirectly), which repeatedly does `kern.boottime` sysctls until two results match.
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src/kernel/emulation/linux/misc/sysctl_kern.c
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src/kernel/emulation/linux/misc/sysctl_kern.c
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sys_gettimeofday(tv, NULL);
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tv->tv_sec -= info.uptime;
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// we don't want the microseconds to be constantly jumping around
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// (that actually causes an infinite loop in `_mach_boottime_usec` in libc)
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// but Linux doesn't give us microseconds, so just settle for 0
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tv->tv_usec = 0;
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}
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*oldlen = sizeof(*tv);
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