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#define _GNU_SOURCE

#include <unistd.h>

#include <stdio.h>

#include <errno.h>

#include <grp.h>

#include <sys/types.h>

#include <sys/syscall.h>

int setegid(gid_t gid)

{

    int result;

    if (gid == (gid_t) ~0)

    {

        __set_errno (EINVAL);

        return -1;

    }

#ifdef __NR_setresgid

    result = setresgid(-1, gid, -1);

    if (result == -1 && errno == ENOSYS)

        /* Will also set the saved group ID if egid != gid,

         * making it impossible to switch back...*/

#endif

        result = setregid(-1, gid);

    return result;

}