From: "Jörg Krause" <joerg.krause@embedded.rocks>
To: buildroot@busybox.net
Subject: [Buildroot] [PATCH 2/2] sysvinit: add /dev/std{in, out, err} symlinks to inittab
Date: Wed, 4 Apr 2018 20:09:35 +0200 [thread overview]
Message-ID: <20180404180935.15185-3-joerg.krause@embedded.rocks> (raw)
In-Reply-To: <20180404180935.15185-1-joerg.krause@embedded.rocks>
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 <joerg.krause@embedded.rocks>
---
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
next prev parent reply other threads:[~2018-04-04 18:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-04 18:09 [Buildroot] [PATCH 0/2] Add /dev/std{in, out, err} symlinks to inittabs Jörg Krause
2018-04-04 18:09 ` [Buildroot] [PATCH 1/2] busybox: add /dev/std{in, out, err} symlinks to inittab Jörg Krause
2018-05-01 19:52 ` Peter Korsgaard
2018-06-17 15:58 ` Peter Korsgaard
2018-04-04 18:09 ` Jörg Krause [this message]
2018-05-01 19:53 ` [Buildroot] [PATCH 2/2] sysvinit: " Peter Korsgaard
2018-06-17 15:58 ` Peter Korsgaard
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