login blocked - [/bin/sh: can't access tty; job control turned off]

[pcuser p <pcuser.mails@xxxxxxxxx>]

Hi,
Login prompt at the end of kernel bootup is blocked & getting the messasge "/bin/sh: can't access tty; job control turned off"
I've tried with the options in busybox FAQ,nothing worked out.



Details 

ls -l /dev/console
crw-rw-rw-    1 root     root      204,  64 Dec 31 17:00 /dev/console

ls -l /dev/ttySAC0
crw-rw-rw-    1 root     root      204,  64 Dec 31 17:00 /dev/ttySAC0

/etc/inittab:
::sysinit:/etc/init.d/rcS   
ttySAC0::respawn:/sbin/getty -L ttySAC0 115200 vt100 # GENERIC_SERIAL


In ::sysinit:/etc/init.d/rcS 
i'm doing :

exec /bin/sh
setsid sh -c 'exec sh </dev/ttySAC0 >/dev/ttySAC0 2>&1'     

by the completion of /etc/inittabscript,I'm ending in shell prompt with the messsge "/bin/sh: can't access tty; job control turned off"

But I can run all commads from the shell prompt (Except login,if I give system hangs)


I feel the information, I provided may not be very clear,but this is my first time working in linux.
plz suggest a way to get login working.






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