capng_get_caps_process - Linux

Overview

capng_get_caps_process retrieves the capabilities of a process. It’s a kernel-supported mechanism that allows fine-grained control over the capabilities that a process can exercise.

Syntax

void capng_get_caps_process(capng_list_t *list, pid_t pid)

Options/Flags

| Option | Description |
|—|—|
| list | capng_list_t pointer to receive the list of capabilities |
| pid | Process ID whose capabilities we want to get |

Examples

Simple Example

#include <capng.h>
#include <stdio.h>

int main() {
  capng_list_t list;
  capng_get_caps_process(&list, getpid());

  capng_print(stdout, &list);

  capng_list_free(&list);

  return 0;
}

Getting Capabilities of Another Process

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

int main(int argc, char **argv) {
  if (argc != 2) {
    fprintf(stderr, "Usage: %s <pid>\n", argv[0]);
    exit(EXIT_FAILURE);
  }

  pid_t pid = atoi(argv[1]);

  capng_list_t list;
  capng_get_caps_process(&list, pid);

  capng_print(stdout, &list);

  capng_list_free(&list);

  return 0;
}

Common Issues

• Permission denied: Ensure that the user running the program has the required privileges to access the capabilities of the target process.
• Invalid PID: Ensure that the provided PID is valid and corresponds to a running process.

Integration

capng_get_caps_process can be used with other tools to analyze or manage process capabilities:

• pscap: A utility to display the capabilities of running processes.
• libcap: A library for manipulating capabilities.

Related Commands

• capng_get_caps_thread
• capng_get_caps_effective