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Is gcc's __attribute__((packed)) / #pragma pack unsafe?

...ntially unsafe on some systems. The symptom probably won't show up on an x86, which just makes the problem more insidious; testing on x86 systems won't reveal the problem. (On the x86, misaligned accesses are handled in hardware; if you dereference an int* pointer that points to an odd address, it...
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Why is processing a sorted array faster than processing an unsorted array?

...hless - Random seconds = 3.113581453 // Branchless - Sorted seconds = 3.186068823 Observations: With the Branch: There is a huge difference between the sorted and unsorted data. With the Hack: There is no difference between sorted and unsorted data. In the C++ case, the hack is actually a tad sl...
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Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术

Shell脚本编程30分钟入门linux_shell_30min_guides什么Shell脚本示例看个例子吧:#! bin shcd ~mkdir shell_tutcd shell_tutfor ((i=0; i<10; i++)); do touch test_$i.txt... 什么Shell脚本 示例 看个例子吧: #!/bin/sh cd ~ mkdir shell_tut cd shell_tut for (...
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逆向工程——二进制炸弹(CSAPP Project) - 操作系统(内核) - 清泛网 - 专注...

...,每关要输入一个密码才能过关,就像解谜游戏一样,还很有意思的,同时对于程序(函数,返回值,堆栈的组织)如何运行的有更深的理解。 破解唯一可用的线索就只有这个二进制文件了。这题对于反汇编能有更深入练...
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Modbus硬件控制01——什么Modbus - 创客硬件开发 - 清泛IT社区,为创赋能!

本帖最后由 mzb2012 于 2025-06-19 12:37 编辑 Modbus算嵌入式领域比较经典一种通信协议,不管你初学者,还工作多年的工程师,都很有必要了解一下。1.什么Modbus?1.什么Modebus它一个Bus,即总线协议。比如串口协议、IIC...
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简单谈谈软件配置管理 - 项目管理 - 清泛网 - 专注C/C++及内核技术

...件生命周期的所有领域并影响所有数据和过程。配置管理指用于控制系统一系列变化的学科。通过一系列技术,方法和手段来维护产品的历史,标识和定位产品独有的版本,并在产品的开发和发布阶段控制变化。通过有序管理...
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Wi-Fi 什么的缩写 - 创意 - 清泛网 - 专注C/C++及内核技术

Wi-Fi 什么的缩写请对照上图自测。如果你 Level 0,阅读本文前建议先搜索并查看相关资料学习 Wi-Fi 的基本概念,本文将不涉及定义或技术上的解释。Wi-... 请对照上图自测。如果你 Level 0,阅读本文前建议先搜索并查看相...
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What is the difference between the kernel space and the user space?

... CPU rings are the most clear distinction In x86 protected mode, the CPU is always in one of 4 rings. The Linux kernel only uses 0 and 3: 0 for kernel 3 for users This is the most hard and fast definition of kernel vs userland. Why Linux does not use rings 1 and 2: ...
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你以为发传单真的这么简单吗?(提升成功率干货) - 更多技术 - 清泛网 - 专...

...功率干货)在软二,上班时间从东门走到公司的15分钟总压力山大。外卖军团在这中间被设置了重重关卡,不同的传单小哥小妹,甚至大叔 阿姨,他们总...在软二,上班时间从东门走到公司的15分钟总压力山大。外卖军团...
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MFC CString::Format()函数详解 - C/C++ - 清泛网 - 专注C/C++及内核技术

...序时经常会使用CString::Format()来格式化字符串!但往往只使用了Format很少一部分功能,比如整型转换成字符串!不过今天我想...我在编写程序时经常会使用CString::Format()来格式化字符串!但往往只使用了Format很少一部分功能...