主题 : /bin/sh: can't access tty; job control turned off（was: 求助：busybox启动时碰到的问题) 复制链接 | 浏览器收藏 | 打印
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楼主  发表于: 2010-02-10 15:04
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 /bin/sh: can't access tty; job control turned off（was: 求助：busybox启动时碰到的问题)

我的busybox的initab文件内容是这样的：

::sysinit:/etc/init.d/rcS
::respawn:-/bin/sh
tty2::askfirst:-/bin/sh
::ctrlaltdel:/bin/umount -a -r

开机时出现错误提示（最后一行）

VFS: Mounted root (cramfs filesystem) readonly on device 31:3.
Freeing init memory: 176K
cramfs: bad compressed blocksize 4273664864
Failed to execute /linuxrc.  Attempting defaults...
cramfs: bad compressed blocksize 4273664840
s3c2440-sdi s3c2440-sdi: running at 0kHz (requested: 0kHz).
s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).
s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).
s3c2440-sdi s3c2440-sdi: running at 198kHz (requested: 197kHz).
s3c2440-sdi s3c2440-sdi: powered down.
/bin/sh: can't access tty; job control turned off
#

请问是什么原因？
[ 此帖被kasim在2010-02-10 16:03重新编辑 ]
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1楼  发表于: 2010-02-10 17:00
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(http://www.uclibc.org/FAQ.html#job_control)
Why do I keep getting "sh: can't access tty; job control turned off" errors? Why doesn't Control-C work within my shell?

This isn't really a uClibc question, but I'll answer it here anyways. Job control will be turned off since your shell can not obtain a controlling terminal. This typically happens when you run your shell on /dev/console. The kernel will not provide a controlling terminal on the /dev/console device. Your should run your shell on a normal tty such as tty1 or ttyS0 and everything will work perfectly. If you REALLY want your shell to run on /dev/console, then you can hack your kernel (if you are into that sortof thing) by changing drivers/char/tty_io.c to change the lines where it sets "noctty = 1;" to instead set it to "0". I recommend you instead run your shell on a real console...
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2楼  发表于: 2010-02-10 17:50
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 回 1楼(kasim) 的帖子

前辈的意思是 将 tty2::askfirst:-/bin/sh
改为 tty1？
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3楼  发表于: 2010-02-11 10:18
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 回 2楼(curay) 的帖子

不管是tty什么，你要确保
1. 这是一个tty设备节点；
2. 这个设备节点在运行init进程的时候可以访问的到（可以是通过mknod在cramfs文件系统镜像中创建或mdev动态地在启动过程中创建）
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4楼  发表于: 2010-07-17 17:16
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相同的问题
我的解决方法如下;
inittab里面改为ttySAC0::/bin/sh

rootfs/dev下面创建节点ttySAC0 mknod ttySAC0 c 204 64<-----这个是我在Documentation下面的一个文档上看到的

Please press Enter to activate this console.
Starting pid 301, console /dev/ttySAC0: '/bin/sh'


BusyBox v1.1.3 (2010.07.17-04:17+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.
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