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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.

April 2023 Kernel Hackers Manual 2.6.