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authorGravatar Jörg Krause <joerg.krause@embedded.rocks>2018-04-04 20:09:34 +0200
committerGravatar Peter Korsgaard <peter@korsgaard.com>2018-05-01 21:53:45 +0200
commit456ea9871ea015fe2c5a7eb79c4762787286fa56 (patch)
tree8e32ac7b989fceff284375f61f7044c040220aec
parentd5097bc00e340c83ef5124c06a8c6599d1876c27 (diff)
downloadbuildroot-456ea9871e.tar.gz
buildroot-456ea9871e.tar.bz2
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 <joerg.krause@embedded.rocks> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
-rw-r--r--package/busybox/inittab4
1 files changed, 4 insertions, 0 deletions
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