-On [20080120 18:38], Oleg Broytmann ([EMAIL PROTECTED]) wrote:
> A shell has nothing to do with it as it is the OS (exec system call)
>that upon reading the magic of the file sees #! and executes the program
>(up to the first space) and pass to the program the first (and the only)
>parameter.
Yes, you are right. *sigh* It's been too long since I dug around the kernel on
a daily basis.
I had totally forgotten about imgact_shell.c's parsing of the hashbang. As
execve(2) documents on FreeBSD:
An interpreter file begins with a line of the form:
#! interpreter [arg]
When an interpreter file is execve'd, the system actually execve's the
specified interpreter. If the optional arg is specified, it becomes the
first argument to the interpreter, and the name of the originally
execve'd file becomes the second argument; otherwise, the name of the
originally execve'd file becomes the first argument. The original argu-
ments are shifted over to become the subsequent arguments. The zeroth
argument is set to the specified interpreter.
--
Jeroen Ruigrok van der Werven <asmodai(-at-)in-nomine.org> / asmodai
イェルーン ラウフロック ヴァン デル ウェルヴェン
http://www.in-nomine.org/ | http://www.rangaku.org/
The greatness of a nation and its moral progress can be judged by the way
its animals are treated.
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