ulseek
if (ulseek(offset - 1, SEEK_SET) < 0)
if (ulseek(off, SEEK_SET) < 0)
if (ulseek(offset, SEEK_SET) < 0)
if (ulseek(sb.st_size, SEEK_SET) < 0)
if (ulseek(t, SEEK_SET) < 0)
if (ulseek(0, SEEK_SET) < 0)
if (ulseek((void *)relp - (void *)ehdr, SEEK_SET) < 0)