Messages can not be aligned

Hi Justin,

What terminal emulator are you using? Can you try with another?

Best regards,
Miroslav

Hi Miroslav

I use  HyperTerminal in Microsoft Windows XP

if i run udhcpc by am335x linux  console ,it is aligned,

if  i run udhcpc by my Application program,it is Non-aligned

Regards

Justin,

Please explain what do you mean by "run udhcpc by your Application program". If I understand you correctly, the default dhcpc program works correctly and prints aligned messages. What does your application program do?

Best regards,
Miroslav

Hello,

I know the "\r\n" problem , but my program only call system() function

I did not do any special settings

Much clearer. Should have started with that. That said, I don't know why the line endings would get messed up. In theory, the system() command should share your app's stdout. HyperTerminal should see no difference. Perhaps the system() process uses a shell with different tty settings. That's all I got.

A request to forum guys. I did not mark my post as "Suggested Answer". Who does these things? Can you remove "Suggested Answer" off my post.

I've tried udhcpc and system("udhcpc") on my target. I do not see the misaligned results.

Shell Paths
/bin/sh -> busybox
/bin/ash -> busybox

Versions:
Linux 3.13.0
Busybox 1.21.1

Output of stty in ash or sh:
speed 115200 baud; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol =
; eol2 = <undef>;
swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W;
lnext = ^V; flush = ^O; min = 1; time = 0;
-brkint ixoff -imaxbel
-iexten -echoctl

HyperTerminal Properties/Settings:
Emulation: VT100
Terminal Settings: Cursor=Blink, Character set=ASCII
ASCII Setup: All unchecked.

Hello Norman

Thanks for your help :)

I do not know why non-aligned when call system(udhcpc -xxxx - xxx  )

I use TI SDK 6.0, kernel 3.2

and i recompiled busybox 1.22.2 to overwrite busybox files in arago-base-tisdk-image-am335x-evm

I only get misaligned output if I intentionally alter the line ending translation of the terminal:

stty ocrnl -onlcr

Perhaps the system() function is doing something to the terminal. Try printing out the tty settings directly "stty -a" and indirectly with system("stty -a"). See if they are different.