/lib/udev/rules.d/50-udev-default.rules is in udev 175-7.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # virtio serial / console ports
KERNEL=="vport*", ATTR{name}=="?*", SYMLINK+="virtio-ports/$attr{name}"
SUBSYSTEM=="input", ENV{ID_INPUT}=="", IMPORT{builtin}="input_id"
# RTC on some architectures
SUBSYSTEM=="rtc", DRIVERS=="rtc_cmos", SYMLINK+="rtc"
# /dev/sndstat
SUBSYSTEM=="module", KERNEL=="snd", ACTION=="add", \
RUN+="/bin/ln -sf /proc/asound/oss/sndstat $root/sndstat"
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