Would like to know where in the Linux 2.4.2 source code the shell
interpreter is implemented. (please indicate the directory and file
name also if it is a separate file)
As well the paragraph of code that let the shell send out the shell
prompt back to the logged on user. |
Request for Question Clarification by
studboy-ga
on
25 Feb 2003 18:14 PST
Hi
The bash shell src is independent--you can compile it yourself.
Try looking in /usr/src /usr/local/src or /tools/src
under gnu.
May I ask whether you want to just change the prompt?
If all you want is to change the prompt you can set the PS1 variable
upon login (.bashrc).
|
Clarification of Question by
ga1000-ga
on
25 Feb 2003 19:20 PST
Not to change the prompt sign, but to send out the prompt twice, to
see whether I can get at least one shell prompt to solve my 'missing
prompt' problem mentioned in an earlier question.
|
Request for Question Clarification by
studboy-ga
on
25 Feb 2003 23:26 PST
OK, I looked back at your questions--I think it's better to solve th
eproblem at the root rather than hacking bash to send out two shell
prompts... Can I ask a question? After you do a Ctrl-Z to bring back
the shell prompt, can you do a:
ps -ef
and tell me the output?
I'm guessing your program might not have terminated properly--ie, it's
still running, that's why you didn't get the prompt back.
|
Clarification of Question by
ga1000-ga
on
26 Feb 2003 08:11 PST
The missing prompt occurs with the standard shell command like 'dir'
or 'ls', as well as my programs.
The hardware uses a special device driver. You can take a look at it
(see my previous questions). I checked this device driver with the
Linux kernel RS232 device driver, called rs232.c (it is in the
user/src's character folder).
There is a section in rs232.c that my device driver does not have. Do
you think it has anything to do with the problem? (see below)
==============================================================================
static void serial_console_write(struct console *co, const char *s,
unsigned count)
{
static struct async_struct *info = &async_sercons;
int ier;
unsigned i;
/*
* First save the IER then disable the interrupts
*/
ier = serial_in(info, UART_IER);
serial_out(info, UART_IER, 0x00);
/*
* Now, do each character
*/
for (i = 0; i < count; i++, s++) {
wait_for_xmitr(info);
/*
* Send the character out.
* If a LF, also do CR...
*/
serial_out(info, UART_TX, *s);
if (*s == 10) {
wait_for_xmitr(info);
serial_out(info, UART_TX, 13);
}
}
/*
* Finally, Wait for transmitter & holding register to empty
* and restore the IER
*/
wait_for_xmitr(info);
serial_out(info, UART_IER, ier);
}
|
Clarification of Question by
ga1000-ga
on
26 Feb 2003 08:21 PST
Below please find the output of ps -ef. I use getty for ttyM0 and
agetty for ttyM1. ttyM1 (port 2 of the serial port is used here)
=============================================================================
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 10:12 ? 00:00:04 init [5]
root 2 1 0 10:12 ? 00:00:00 [keventd]
root 3 1 0 10:12 ? 00:00:00 [kapm-idled]
root 4 1 0 10:12 ? 00:00:00 [kswapd]
root 5 1 0 10:12 ? 00:00:00 [kreclaimd]
root 6 1 0 10:12 ? 00:00:00 [bdflush]
root 7 1 0 10:12 ? 00:00:00 [kupdated]
root 8 1 0 10:13 ? 00:00:00 [mdrecoveryd]
root 17 1 6 10:13 ? 00:00:36 [loop1]
root 82 1 0 10:13 ? 00:00:00 [khubd]
root 511 1 0 10:14 ? 00:00:00 syslogd -m 0
root 516 1 0 10:14 ? 00:00:00 klogd -2
rpc 530 1 0 10:14 ? 00:00:00 portmap
rpcuser 545 1 0 10:14 ? 00:00:00 rpc.statd
root 629 1 0 10:14 ? 00:00:00 /usr/sbin/apmd -p 10
-w 5 -W -P
root 678 1 0 10:14 ? 00:00:00 /usr/sbin/automount
--timeout 60
daemon 693 1 0 10:14 ? 00:00:00 /usr/sbin/atd
root 740 1 0 10:14 ? 00:00:00 sendmail: accepting
connections
root 753 1 0 10:14 ? 00:00:00 gpm -t ps/2 -m
/dev/mouse
root 765 1 0 10:14 ? 00:00:00 crond
xfs 801 1 0 10:14 ? 00:00:00 xfs -droppriv -daemon
root 830 1 0 10:14 tty1 00:00:00 /sbin/mingetty tty1
root 831 1 0 10:14 tty2 00:00:00 /sbin/mingetty tty2
root 832 1 0 10:14 tty3 00:00:00 /sbin/mingetty tty3
root 833 1 0 10:14 tty4 00:00:00 /sbin/mingetty tty4
root 834 1 0 10:14 tty5 00:00:00 /sbin/mingetty tty5
root 835 1 0 10:14 tty6 00:00:00 /sbin/mingetty tty6
root 836 1 0 10:14 ttyM0 00:00:00 /sbin/getty ttyM0
DT19200 wy60
root 837 1 0 10:14 ttyM1 00:00:00 login -- root
root 838 1 0 10:14 ? 00:00:00 /usr/bin/gdm -nodaemon
root 845 838 0 10:14 ? 00:00:02 /etc/X11/X -auth
/var/gdm/:0.Xau
root 846 838 0 10:14 ? 00:00:00 /usr/bin/gdm -nodaemon
root 857 846 0 10:14 ? 00:00:00 /usr/bin/gnome-session
root 920 1 0 10:14 ? 00:00:00 gnome-smproxy
--sm-client-id def
root 924 1 0 10:14 ? 00:00:01 sawfish
--sm-client-id=default2
root 942 1 1 10:15 ? 00:00:07 magicdev
--sm-client-id=default1
root 953 1 0 10:15 ? 00:00:00 gnome-name-service
root 957 1 0 10:15 ? 00:00:00 panel --sm-client-id
default7
root 960 1 0 10:15 ? 00:00:00 gmc --nowindows
--sm-client-id d
root 967 1 0 10:15 ? 00:00:00 tasklist_applet
--activate-goad-
root 969 1 0 10:15 ? 00:00:00 deskguide_applet
--activate-goad
root 1112 837 0 10:21 ttyM1 00:00:00 -bash
root 1142 1112 5 10:22 ttyM1 00:00:00 ps -ef
|
Request for Question Clarification by
studboy-ga
on
26 Feb 2003 09:36 PST
Let me take a closer look at the code... I think the saving and
restoring IER oart might have something to do with it.
|
Clarification of Question by
ga1000-ga
on
26 Feb 2003 10:58 PST
If you would explain the purpose of this code section in serial.c,
including what is ier and why it needs to be saved, why Lf needs to be
added by the device driver, then please consider the question
answered.
I will ask new questions if this code section needs to be inserted
into my board's device driver code.
|
Clarification of Question by
ga1000-ga
on
18 Mar 2003 20:20 PST
My problem turns out to be device driver related.
So I will close the question. Thank you.
|
