From: Jörg Krause Date: Wed, 4 Apr 2018 18:09:34 +0000 (+0200) Subject: busybox: add /dev/std{in, out, err} symlinks to inittab X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=456ea9871ea015fe2c5a7eb79c4762787286fa56;p=buildroot.git busybox: add /dev/std{in, out, err} symlinks to inittab Some applications, e.g. bashs process subsitution feature, rely on the convention of `/dev/fd` being a symbolic link to `/proc/self/fd`. This symbolic link and his companions `/dev/std*` are created by (e)udev [1], but not by mdev, resulting in the following error when using the following expression: ``` bash: /dev/fd/62: No such file or directory ``` For the sake of simplicity, lets fix this by creating the symlinks in inittab. It is only really needed if eudev isn't used, but it doesn't really hurt to create them even if eudev will recreate them afterwards. Note, that we do not create the symlink `/dev/core` as `/proc/kcore` is not available on all platforms, e.g. ARM, and the feature is not much appreciated [2]. [1] https://github.com/gentoo/eudev/blob/8943501993322c59a6eb5be456b0d716aafff21e/src/shared/dev-setup.c#L35-L40 [2] https://lwn.net/Articles/45315/ [Peter: redirect output (errors) to /dev/null for ro rootfs] Signed-off-by: Jörg Krause Signed-off-by: Peter Korsgaard --- diff --git a/package/busybox/inittab b/package/busybox/inittab index 3f49f6bd7a..ef58c32f0d 100644 --- a/package/busybox/inittab +++ b/package/busybox/inittab @@ -19,6 +19,10 @@ ::sysinit:/bin/mkdir -p /dev/pts ::sysinit:/bin/mkdir -p /dev/shm ::sysinit:/bin/mount -a +null::sysinit:/bin/ln -sf /proc/self/fd /dev/fd +null::sysinit:/bin/ln -sf /proc/self/fd/0 /dev/stdin +null::sysinit:/bin/ln -sf /proc/self/fd/1 /dev/stdout +null::sysinit:/bin/ln -sf /proc/self/fd/2 /dev/stderr ::sysinit:/bin/hostname -F /etc/hostname # now run any rc scripts ::sysinit:/etc/init.d/rcS