From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?q?J=C3=B6rg=20Krause?= Date: Wed, 4 Apr 2018 20:09:35 +0200 Subject: [Buildroot] [PATCH 2/2] sysvinit: add /dev/std{in, out, err} symlinks to inittab In-Reply-To: <20180404180935.15185-1-joerg.krause@embedded.rocks> References: <20180404180935.15185-1-joerg.krause@embedded.rocks> Message-ID: <20180404180935.15185-3-joerg.krause@embedded.rocks> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net 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/ Signed-off-by: J?rg Krause --- package/sysvinit/inittab | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/package/sysvinit/inittab b/package/sysvinit/inittab index fad91eae8b..608aabce07 100644 --- a/package/sysvinit/inittab +++ b/package/sysvinit/inittab @@ -9,7 +9,11 @@ si1::sysinit:/bin/mount -o remount,rw / si2::sysinit:/bin/mkdir -p /dev/pts si3::sysinit:/bin/mkdir -p /dev/shm si4::sysinit:/bin/mount -a -si5::sysinit:/bin/hostname -F /etc/hostname +si5::sysinit:/bin/ln -sf /proc/self/fd /dev/fd +si6::sysinit:/bin/ln -sf /proc/self/fd/0 /dev/stdin +si7::sysinit:/bin/ln -sf /proc/self/fd/1 /dev/stdout +si8::sysinit:/bin/ln -sf /proc/self/fd/2 /dev/stderr +si9::sysinit:/bin/hostname -F /etc/hostname rcS:12345:wait:/etc/init.d/rcS # S0:1:respawn:/sbin/getty -L ttyS0 115200 vt100 # GENERIC_SERIAL -- 2.16.3