Hi, Nada, Return value of -1 could be EPERM, "Operation not permitted"; see: http://lxr.free-electrons.com/source/include/uapi/asm-generic/errno-base.h Can you paste the code in pastebin or some other public site? regards, Rami Rosen http://ramirose.wix.com/ramirosen On Fri, May 2, 2014 at 9:23 AM, Nada Saif <nada.saif7@gmail.com> wrote:

Hi,

I added a new system call to kernel 2.6.32.61 - I used these commands for complication :

make oldconfig make make modules install

It went ok with few warning messages.

When I tried to test the system call , the function _syscall return -1, what that means?

Thanks, Nada

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