[SOLVED] How to use my custom syscall from the terminal?

Issue

My system call takes an integer and returns long. I can use it in a C code like syscall(549,1). But I would like to use it from the terminal not from a C code. Can you please help me?

Solution

There is no way you can directly use your system call from the shell. Although, you can write a simple C program, compile it and add its location to the PATH directly or put in in /usr/local/bin. Then you will be able to call this binary directly from the shell.

The code of your C program would look something like this:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    printf("%ld\n", syscall(549, (int) strtol(argv[1], NULL, 0)));
    return EXIT_SUCCESS;
}

Answered By - user8704868

Answer Checked By - David Marino (WPSolving Volunteer)