cap/cap_functions.h

This is cap/cap_functions.h, an example to accompany the book, The Linux Programming Interface.

This file is not printed in the book; it is a supplementary file for Chapter 39.

In the listing below, the names of Linux system calls and C library functions are hyperlinked to manual pages from the Linux man-pages project, and the names of functions implemented in the book are hyperlinked to the implementations of those functions.

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/* cap_functions.h

   Useful functions for working with capabilities.
*/

#ifndef CAP_FUNCTIONS_H             /* Prevent double inclusion */
#define CAP_FUNCTIONS_H

#include <stdio.h>
#include <sys/capability.h>
#include <stdbool.h>

/* Change the 'setting' of the specified 'capability' in the capability set
   specified by 'flag'.

   'flag' is one of CAP_PERMITTED, CAP_EFFECTIVE, or CAP_INHERITABLE.
   'setting' is one of CAP_SET or CAP_CLEAR.

   Returns: 0 on success or -1 on error. */

int modifyCapSetting(cap_flag_t flag, int capability, int setting);

/* Display a securebits mask in either short or long form, depending on
   the value of 'verbose'. */

void printSecbits(int secbits, bool verbose, FILE *fp);

#endif

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