buildroot/fs/cpio/init

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#!/bin/sh
# devtmpfs does not get automounted for initramfs
/bin/mount -t devtmpfs devtmpfs /dev
# use the /dev/console device node from devtmpfs if possible to not
# confuse glibc's ttyname_r().
# This may fail (E.G. booted with console=), and errors from exec will
# terminate the shell, so use a subshell for the test
if (exec 0</dev/console) 2>/dev/null; then
exec 0</dev/console
exec 1>/dev/console
exec 2>/dev/console
fi
exec /sbin/init "$@"