[patch] exit status in msh

[Jie Zhang]

Hi,

msh returns wrong exit status for command that cannot execute correctly. 
According to

http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html

[quote]
The exit status of a command that terminated because it received a 
signal shall be reported as greater than 128.
[/quote]

The convention of bash is to return (128 + signal number). But msh 
returns -1 in that case.

[quote]
If a command is not found, the exit status shall be 127. If the command 
name is found, but it is not an executable utility, the exit status 
shall be 126.
[/quote]

But msh returns 255 for both cases.

This patch should fix the first case. Please review and commit if OK.


Thanks,
Jie Zhang

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