#define _DEFAULT_SOURCE         /* for setgroups(2) */

#include <Python.h>

/*
 * Verify that Python.h defined _GNU_SOURCE, which is required for setresuid(2)
 * and setresgid(2).  Defining it before including Python.h will cause a
 * diagnostic:
 *
 *  warning: "_GNU_SOURCE" redefined
 *
 * So we rely on Python.h to define it, but verify that it actually did so.
 */

#ifndef _GNU_SOURCE         /* setresuid(2) & setresgid(2) */
#error  Python.h did not define _GNU_SOURCE
#endif

#include <grp.h>
#include <sys/capability.h>
#include <sys/prctl.h>
#include <sys/types.h>

#include <errno.h>
#include <stdlib.h>
#include <string.h>

/*
 * Verify that we've got the GNU-specific version of strerror_r(3)
 */

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-variable"
#pragma GCC diagnostic error "-Wincompatible-pointer-types"
__attribute__((unused))
static inline void check_for_gnu_strerror_r(void)
{
    /*
    * If this causes an 'incompatible pointer type' error, strerror_r is
    * the XSI-compliant version; we need the GNU-specific version.  See
    * strerror_r(3).
    */
    char *(*foo)(int, char *, size_t) = strerror_r;
}
#pragma GCC diagnostic pop