suse man page for syscall_get_arguments

SYSCALL_GET_ARGUMENT(9) 					   Machine State					   SYSCALL_GET_ARGUMENT(9)

NAME
       syscall_get_arguments - extract system call parameter values

SYNOPSIS
       void syscall_get_arguments(struct task_struct * task, struct pt_regs * regs, unsigned int i, unsigned int n, unsigned long * args);

ARGUMENTS
       task
	   task of interest, must be blocked

       regs

	   task_pt_regs of task

       i
	   argument index [0,5]

       n
	   number of arguments; n+i must be [1,6].

       args
	   array filled with argument values

DESCRIPTION
       Fetches n arguments to the system call starting with the i'th argument (from 0 through 5). Argument i is stored in args[0], and so on. An
       arch inline version is probably optimal when i and n are constants.

       It's only valid to call this when task is stopped for tracing on entry to a system call, due to TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT.
       It's invalid to call this with i + n > 6; we only support system calls taking up to 6 arguments.

Kernel Hackers Manual 2.6.					     July 2010						   SYSCALL_GET_ARGUMENT(9)