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Full Discussion: Adding our system call Fedora 18 -new syscall
Operating Systems Linux Red Hat Adding our system call Fedora 18 -new syscall Post 302796925 by googz on Sunday 21st of April 2013 04:51:24 PM
Old 04-21-2013
If i have 64 btis system then i have still to edit this file: "unistd_32.h"?

---------- Post updated at 03:51 PM ---------- Previous update was at 10:35 AM ----------

I must add syscall in Fedora 18 kernel 3.8.2 32 or 64. I take 32 on virtual box.
First i tried this:

"
  • Upzip it with command ‘tar xvfj XXX” to a folder For example : /root/kernel tar xvfj linux-3.3.1.tar.bz2
  • Edit file “/root/kernel/linux-3.3.1/arch/x86/syscalls/syscall_64.tbl” Add new line
312 64 husky1 sys_husky1
  • Eidt file “/root/kernel/linux-3.3.1/include/linux/syscalls.h” Add new function declaration
asmlinkage long sys_husky1(int fd);
before the line “#endif”
  • Add a new c file under “/root/kernel/linux-3.3.1/arch/x86/kernel” (I am using x86 CPU) Example :
  • Edit “/root/kernel/linux-3.3.1/arch/x86/kernel/Makefile” Add a new line “obj-y += husky.o”
  • goto /root/kernel/linux-3.3.1 folder and run command “make –j8” "


but after make menuconfig
and then make
I got this warning: "warning: function declaration isn't a prototype"


this is my demosys.c file:


Code:
#include <linux/linkage.h> 
#include <linux/kernel.h>  
asmlinkage long sys_democall()
 {     
                        printk ("Hello world\n");   
  
                        return 0; 
}

and this is my declaration in linux-3.8.2/include/linux/syscalls.h
Code:
asmlinkage long sys_democall(void);

and linux-3.3.1/arch/x86/syscalls/syscall_32.tbl
351 i386 democall sys_democall


Is this method good to add system call?
Did this erorr interferes with something?
after end of compilation my syscall will work?
 

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LEARN ABOUT MOJAVE

switch_root

SWITCH_ROOT(8)                                                 System Administration                                                SWITCH_ROOT(8)

NAME

       switch_root - switch to another filesystem as the root of the mount tree

SYNOPSIS

       switch_root [-hV]

       switch_root newroot init [arg...]

DESCRIPTION

       switch_root moves already mounted /proc, /dev, /sys and /run to newroot and makes newroot the new root filesystem and starts init process.

       WARNING: switch_root removes recursively all files and directories on the current root filesystem.

OPTIONS

       -h, --help
              Display help text and exit.

       -V, --version
              Display version information and exit.

RETURN VALUE

       switch_root returns 0 on success and 1 on failure.

NOTES

       switch_root  will  fail  to  function if newroot is not the root of a mount. If you want to switch root into a directory that does not meet
       this requirement then you can first use a bind-mounting trick to turn any directory into a mount point:

              mount --bind $DIR $DIR

SEE ALSO

       chroot(2), init(8), mkinitrd(8), mount(8)

AUTHORS

       Peter Jones <pjones@redhat.com>
       Jeremy Katz <katzj@redhat.com>
       Karel Zak <kzak@redhat.com>

AVAILABILITY

       The switch_root command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux                                                           June 2009                                                      SWITCH_ROOT(8)
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