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/* First the options that are allowed only allowed for root */
if (getuid == 0 || geteuid != 0) {
  /* ... */
}

/* First the options that are allowed only allowed for root */
if (getuid() == 0 || geteuid != 0) {
  /* ... */
}

/* First the options that are allowed only allowed for root */
if (getuid() == 0 || geteuid() != 0) {
  /* ... */
}

/* First the options that are allowed only allowed for root */ 
if (getuid == (uid_t(*)(void))0 || geteuid != (uid_t(*)(void))0) { 
  /* ... */ 
} 

int do_xyz(void); 
 
int f(void) {
/* ... */ 
  if (do_xyz()) { 
    return -1; /* Indicate failure */
  }
/* ... */
  return 0;  
}