function::set_user_pointer - Linux

Overview

The set_user_pointer function in Linux sets a user pointer for the function. This pointer is typically used to pass additional information to the function or to store the result of the function.

Syntax

int set_user_pointer(unsigned long arg)

Parameters:

• arg – The user pointer to set.

Return Value:

The function returns 0 on success, or -1 on error.

Options/Flags

None.

Examples

The following example shows how to use the set_user_pointer function to set a user pointer for a function:

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

int main() {
  int *ptr = malloc(sizeof(int));
  *ptr = 42;

  set_user_pointer((unsigned long)ptr);

  // ...

  free(ptr);

  return 0;
}

Common Issues

One common issue when using the set_user_pointer function is that the user pointer must be valid for the duration of the function call. If the user pointer is invalid, the function will crash.

Integration

The set_user_pointer function can be combined with other Linux commands and tools to perform advanced tasks. For example, the following command chain uses the set_user_pointer function to pass a user pointer to the execve function:

set_user_pointer((unsigned long)&user_ptr);
execve("/bin/sh", NULL, NULL);

Related Commands

• get_user_pointer: Gets the user pointer for the function.
• execve: Executes a new program.