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SYSCALL_SET_ARGUMENT(9) Machine State SYSCALL_SET_ARGUMENT(9)

NAME

syscall_set_arguments - change system call parameter value

SYNOPSIS

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

ARGUMENTS

task

task of interest, must be in system call entry tracing

regs

task_pt_regs of task

i

argument index [0,5]

n

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

args

array of argument values to store

DESCRIPTION

Changes n arguments to the system call starting with the i´th argument. Argument i gets value 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.