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.TH "realksh" 8 "2006 Jan 1" "binfmt_misc Dancer" "binfmt_C"
.SH "NAME"
realksh.c \- A shell for running Kernel-mode C code
.SH "SYNOPSIS"
.BI "realksh.c "
.SH "DESCRIPTION"
.B "realksh.c"
is an interactive shell that runs C source code.
A line of input is handled as a line in
.B "module_init()"
function, and the resulting C code is compiled to build a kernel module.
The module is then inserted into the kernel, and removed from the kernel.
kernel message output prepended with
.B "KMSG: "
is copied to standard out for convenience, so that functions like
.B "printk"
can be used for easy debugging.
If a line starting with
.B "#"
such as
.B "#include <stdio.h>"
is entered, it is added to every code after that
at the start of sourcecode.
The list of such lines can be seen with
.B "##"
.SH "EXAMPLES"
The following is an example session
.nf
$ sudo ./realksh.c
REAL ksh: printk ("hello\\n");
Building modules, stage 2.
KMSG: <4>hello
REAL ksh: printk ("%x\\n", mfmsr());
Building modules, stage 2.
KMSG: <4>9032
REAL ksh: printk ("%x\\n", mfspr(SPRN_MMCR0));
Building modules, stage 2.
KMSG: <4>0
REAL ksh:
.hy
.SH "INTERNALS"
The following is how the C code looks like.
.nf
#include <linux/module.h>
#include <linux/init.h>
MODULE_AUTHOR("dancerj");
MODULE_DESCRIPTION("....");
MODULE_LICENSE("GPL");
static int __init realkshmod2_init(void)
{
.I "input-line"
return 0;
}
static void __exit realkshmod2_cleanup(void)
{
}
module_init(realkshmod2_init);
module_exit(realkshmod2_cleanup);
.hy
.SH "AUTHOR"
Junichi Uekawa (dancer@debian.org)
Upstream page is available at
.B "http://www.netfort.gr.jp/~dancer/software/"
.SH "SEE ALSO"
.BR "binfmtc-interpreter" "(1),"
.BR "realcsh.c" "(1),"
.BR "realcxxsh.cc" "(1)"
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