glibc

MySQL5.7.x安装教程（tar.gz）

由 三世轮回 提交于 2021-02-11 18:36:06
博主本人平和谦逊，热爱学习，读者阅读过程中发现错误的地方，请帮忙指出，感激不尽 二、MySQL 安装（ tar.gz ） 1. 系统环境设置 1.1 清空系统 mysql 安装mysql之前需要将系统自带的mysql包进行删除： yum remove all mysql\ * 1.2SELinux 设置 vim /etc/selinux/ config 输入： disabled reboot getenforce df -lh （确保拥有4G空间可用） 1.3 创建目录 1.3.1 安装目录 mkdir -p / var /lib/mysql5. 7 / 1.3.2 数据文件 mkdir -p / var /lib/mysql5. 7 / data mkdir -p / var /lib/mysql5. 7 /pid 1.3.3 日志目录 mkdir -p / var /lib/mysql5. 7 /log 1.4 设置时间同步 timedatectl set -timezone Asia/ Shanghai date 2. 二进制 安装（ tar.gz ） 2.1 赋权 chmod 755 mysql- 5.7 . 28 -linux-glibc2. 12 -x86_64.tar.gz 2.2 解压 tar -zxvf mysql- 5.7 . 28 -linux-glibc2.

Wide string libc functions on unaligned memory

由 和自甴很熟 提交于 2021-02-11 12:14:35
问题 So I've discovered after painful debugging that libc functions like wcslen will fail silently when dealing with non memory-aligned buffers. In my case doing a wcslen( mystr ) resulted in a faulty length value, which only later on produced a crash (in wcstombs, assert buff[-1] == 0). One solution would be for me to re-write all the wide string functions I need to work on non-aligned memory. This is easy enough but also dirty, and since there is not doc about which parts of libc support non

Wide string libc functions on unaligned memory

由 江枫思渺然 提交于 2021-02-11 12:12:40
问题 So I've discovered after painful debugging that libc functions like wcslen will fail silently when dealing with non memory-aligned buffers. In my case doing a wcslen( mystr ) resulted in a faulty length value, which only later on produced a crash (in wcstombs, assert buff[-1] == 0). One solution would be for me to re-write all the wide string functions I need to work on non-aligned memory. This is easy enough but also dirty, and since there is not doc about which parts of libc support non

Make calloc opportunistic

由 微笑、不失礼 提交于 2021-02-10 14:26:28
问题 On linux malloc behaves opportunistically, only backing virtual memory by real memory when it is first accessed. Would it be possible to modify calloc so that it also behaves this way (allocating and zeroing pages when they are first accessed)? 回答1: It is not a feature of malloc() that makes it "opportunistic". It's a feature of the kernel with which malloc() has nothing to do whatsoever. malloc() asks the kernel for a slap of memory everytime it needs more memory to fulfill a request, and it

Make calloc opportunistic

由 我只是一个虾纸丫 提交于 2021-02-10 14:25:42
问题 On linux malloc behaves opportunistically, only backing virtual memory by real memory when it is first accessed. Would it be possible to modify calloc so that it also behaves this way (allocating and zeroing pages when they are first accessed)? 回答1: It is not a feature of malloc() that makes it "opportunistic". It's a feature of the kernel with which malloc() has nothing to do whatsoever. malloc() asks the kernel for a slap of memory everytime it needs more memory to fulfill a request, and it

linux 分析进程占用CPU过高

由 心不动则不痛 提交于 2021-02-10 11:17:44
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How can I link dynamically to glibc in Ubuntu

由 十年热恋 提交于 2021-02-10 05:02:36
问题 I am trying to assemble and link this tiny x86 assembly code in Linux (Ubuntu 18.04 LTS): ;hello.asm global _start extern scanf, printf, exit section .data read_name db '%255s', 0 msg db 'Hello, %s', 0 section .text _start: sub esp, 256 push esp push read_name call scanf add esp, 8 push esp push msg call printf add esp, 264 push dword 0 call exit I am using nasm to assemble and ld to link. As you can probably tell, the code uses C functions, so it has to be linked to glibc . Since my code is

How can I link dynamically to glibc in Ubuntu

由 百般思念 提交于 2021-02-10 05:00:33
问题 I am trying to assemble and link this tiny x86 assembly code in Linux (Ubuntu 18.04 LTS): ;hello.asm global _start extern scanf, printf, exit section .data read_name db '%255s', 0 msg db 'Hello, %s', 0 section .text _start: sub esp, 256 push esp push read_name call scanf add esp, 8 push esp push msg call printf add esp, 264 push dword 0 call exit I am using nasm to assemble and ld to link. As you can probably tell, the code uses C functions, so it has to be linked to glibc . Since my code is

How can I link dynamically to glibc in Ubuntu

由 不羁岁月 提交于 2021-02-10 05:00:10
问题 I am trying to assemble and link this tiny x86 assembly code in Linux (Ubuntu 18.04 LTS): ;hello.asm global _start extern scanf, printf, exit section .data read_name db '%255s', 0 msg db 'Hello, %s', 0 section .text _start: sub esp, 256 push esp push read_name call scanf add esp, 8 push esp push msg call printf add esp, 264 push dword 0 call exit I am using nasm to assemble and ld to link. As you can probably tell, the code uses C functions, so it has to be linked to glibc . Since my code is

How can I link dynamically to glibc in Ubuntu

由 百般思念 提交于 2021-02-10 04:59:07
问题 I am trying to assemble and link this tiny x86 assembly code in Linux (Ubuntu 18.04 LTS): ;hello.asm global _start extern scanf, printf, exit section .data read_name db '%255s', 0 msg db 'Hello, %s', 0 section .text _start: sub esp, 256 push esp push read_name call scanf add esp, 8 push esp push msg call printf add esp, 264 push dword 0 call exit I am using nasm to assemble and ld to link. As you can probably tell, the code uses C functions, so it has to be linked to glibc . Since my code is
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