Re: rebuild kernel add syscall

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, 2011-03-10 at 15:17 +0800, xinyou yan wrote:
> I want to and a new syscall
> 1  add
> .long sys_mysyscall
> in        arch/x86/kernel/syscall_table_32.S
> 
> 2    add
>        #define   __NR_mysyscall   341
> in    arch/x86/include/asm/unistd_32.
> 
> 3.    add
> 
> asmlinkage int sys_mysyscall(char* sourceFile,char* destFile)
> {
>     int source=sys_open(sourceFile,O_RDONLY,0);
>     int dest=sys_open(destFile,O_WRONLY|O_CREAT|O_TRUNC,0600);
>     char buf[1024];
>     mm_segment_t fs;
>     fs = get_fs();
>     set_fs(get_ds());
>     int nread;
> 
>     if(source>0 && dest>0)
>     {
>             while((nread=sys_read(source,buf,1024)) > 0)
>                        sys_write(dest,buf,read);
>     }
>     else
>     {
>              printk("Error!");
>     }
>     sys_close(source);
>     sys_close(dest);
>     set_fs(fs);
>     return 0;
> }
> in  kerrnel/sys.c
> 
> 4. make menuconfig
> 5. make  all
> 6  make  modules_install
> 
> reboot
> 
> 
> Now I want just do it one time
> How can i make sure the  new syscall here is mysyscall  work fine  ?

Are you locked on using syscalls?
Unless you really require syscalls, I'd imagine that it's far easier to
use ioctl's instead (doesn't require a custom kernel), and use
filp_open / filp_close / file->read / file->write to access files from
within kernel space.

Two more things:
1. I'd avoid using stack based allocations in kernel mode. (Down to 8KB
in certain situations)
2. Always check error codes.

- Gilboa

-- 
users mailing list
users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines

[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [EPEL Devel]     [Fedora Magazine]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Desktop]     [Fedora Fonts]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Fedora Sparc]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux