"Original" Linux adds system calls

First move the kernel file to/usr/src/and unzip it.

Process Reference http://www.cnblogs.com/kavs/p/4607371.html

And then.. Start adding system calls:

sudo gedit/usr/src/linux-4.0.6/kernel/sys.c

Insert header file #include <linux/linkage.h>

   1:

   2:

   3:* /

   4:int sys_leemohello (char

   5: printk (Kern_emerg"===this is Leemo's work ====="

   6: printk (Kern_emerg"==2012221107110095 Leemo"

   7:return

   8: }

sudo gedit/usr/src/linux-4.0.6/arch/x86/syscalls/syscall_32.tbl

Remember to increase the system number as above 359

sudo gedit/usr/src/linux-4.0.6/arch/x86/include/asm/syscalls.h

Compile kernel .... Process Reference http://www.cnblogs.com/kavs/p/4607371.html

Restart after compilation is complete.

Writing test Code

1, first build a folder mkdir Leemotest

2. Create the test code sudo gedit testleemohello.c type the code:

   1: #include <stdio.h>

   2:int main ()

   3: {

   4:int rs;

   5:Char * buf="Leemo";

   6: rs=syscall (359,BUF);

   7: printf ("%d%s \ n", rs,buf);

   8:if(rs==1) {

   9: printf ("system call is success!\n");

  Ten: }

One   :Else

  : printf ("sorry,failed!\n");

  :return 0;

  : }

To compile the test code:

GCC Testleemohello.c-o Testleemohello

To run the test code:

./testleemohello

Results:

then enter DMESG

The call is complete.

"Original" Linux adds system calls