cap.c

#include <stdio.h>
#include <sys/capability.h>
#include <sys/types.h>
#include <unistd.h>

int
main ()
{
        pid_t pid;
        cap_t caps;
        cap_flag_value_t cap_value;

        pid = getpid ();

        caps = cap_get_pid (pid);

        if (!caps)
        {
                return 1;
        }

        if (cap_get_flag (caps,
                          CAP_SYS_TTY_CONFIG,
                          CAP_EFFECTIVE,
                          &cap_value) == -1)
        {
                return 1;
        }

        switch (cap_value)
        {
                case CAP_CLEAR:
                        printf ("CAP_SYS_TTY_CONFIG is unset\n");
                        break;
                case CAP_SET:
                        printf ("CAP_SYS_TTY_CONFIG is set\n");
                        break;
        }

        return 0;
}