“000000q”是什么意思？

Question

我正在学习 x86_64 汇编程序 (yasm) this 教科书。在那里我遇到了以下定义文件访问标志的行：

O_RDONLY        equ    000000q
O_WRONLY        equ    000001q
O_RDWR          equ    000002q

问题是他们的价值观是什么意思？ q 代表什么？

Answer 1

在NASM/YASM中是一个后缀，表示数字是八进制的。来自documentation

3.5.1. Numeric Constants

A numeric constant is simply a number. NASM allows you to specify numbers in a variety of number bases, in a variety of ways: you can suffix H, Q or O, and B for hex, octal, and binary, or you can prefix 0x for hex in the style of C, or you can prefix $ for hex in the style of Borland Pascal. Note, though, that the $ prefix does double duty as a prefix on identifiers (see Section 3.1), so a hex number prefixed with a $ sign must have a digit after the $ rather than a letter.

Some examples:
mov ax,100              ; decimal
mov ax,0a2h             ; hex
mov ax,[=10=]a2             ; hex again: the 0 is required
mov ax,0xa2             ; hex yet again
mov ax,777q             ; octal
mov ax,777o             ; octal again
mov ax,10010011b        ; binary

“000000q”是什么意思？

What does `000000q` mean?

assembly

x86-64

nasm

yasm