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14. testmycall.h (new user space header file to be created)

testmycall.h

  1. Create a header file called testmycall.h. This header file should be included by any program calling our system call.

  2. Add three lines to it

  1. Line 1: This is needed because we need the definition of _syscall1.

#include<linux/unistd.h>

  1. Line 2: This is needed because we need the number of our system call.

#define __NR_mycall 317

  1. Line 3: This is needed for system calls with 1 argument. It is explained in detail below.

_syscall1(long, mycall, int, i)

So, our user header file looks like:

/*---Start of header file------*/

#include<linux/unistd.h>

#define __NR_mycall 317

_syscall1(long, mycall, int, i)

/*---End of header file--------*/