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/* Drop superuser privileges in incorrect order */

if(setuid(getuid());
 == -1) {
  /* handle error condition */
}
if(setgid(getgid())); == -1) {
  /* handle error condition */
}

/* It is still possible to regain group privileges due to incorrect relinquishment order */ 

/*  Drop superuser privileges in correct order */


if(setgid(getgid()));
 == -1) {
  /* handle error condition */
}
if(setuid(getuid())); == -1) {
  /* handle error condition */
}

/*  Not possible to regain group privileges due to correct relinquishment order  */