glibc | 易学教程

Dev production libc/libstdc++ mismatch [link libc.so.6/libstdc++.so.6 with older version] [duplicate]

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问题 This question already has answers here : Deploying Yesod to Heroku, can't build statically (3 answers) Closed 3 years ago . I built an exec on C++, however when I deploy it to the deployment machine I find errors like :` /lib64/libc.so.6: version GLIBC_2.14 not found /usr/lib64/libstdc++.so.6: version GLIBCXX_3.4.14 not found /usr/lib64/libstdc++.so.6: version CXXABI_1.3.5 not found This turns out because the deployment machine is rhel based system with older libc(2.12)/libstdc++(3.4.13)

newlib 和glibc

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newlib glibc license basically it's a berkeley style copyright LGPL destination it is a collection of software from several sources, and was put together by cygnus for embedded system, being intended for embedded systems being intended for native unix environment 来源： https://www.cnblogs.com/dakewei/p/12157297.html

Linux虚拟内存管理(glibc)

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 在使用mysql作为DB开发的兑换券系统中，随着分区表的不断创建，发现mysqld出现了疑似“内存泄露”现象，但通过 valgrind 等工具检测后，并没发现类似的问题(最终原因是由于glibc的内存碎片造成)。最近在做 MySQL 版本升级时（ 5.1->5.5 ） , 发现了 mysqld 疑似“内存泄露”现象，但通过 valgrind 等工具检测后，并没发现类似的问题。因此，需要深入学习 Linux 的虚拟内存管理方面的内容来解释这个现象。 Linux 的虚拟内存管理有几个关键概念：每个进程有独立的虚拟地址空间，进程访问的虚拟地址并不是真正的物理地址虚拟地址可通过每个进程上页表与物理地址进行映射，获得真正物理地址如果虚拟地址对应物理地址不在物理内存中，则产生缺页中断，真正分配物理地址，同时更新进程的页表；如果此时物理内存已耗尽，则根据内存替换算法淘汰部分页面至物理磁盘中。基于以上认识，这篇文章通过本人以前对虚拟内存管理的疑惑由浅入深整理了以下十个问题，并通过例子和系统命令尝试进行解答。 Linux 虚拟地址空间如何分布？ 32 位和 64 位有何不同？ malloc 是如何分配内存的？ malloc 分配多大的内存，就占用多大的物理内存空间吗？如何查看进程虚拟地址空间的使用情况？ free

Getting error while reading unicode file in C

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问题 I want to read a unicode file in C (Cygwin/GCC) using the following code: #include <stdio.h> #include <stdlib.h> #include <glib.h> void split_parse(char* text){ char** res = g_strsplit(text, "=", 2); printf("Key = %s : ", res[0]); printf("Value = %s", res[1]); printf("\n"); } int main(int argc, char **argv) { setenv ("CYGWIN", "nodosfilewarning", 1); GIOChannel *channel; GError *err = NULL; int reading = 0; const gchar* enc; guchar magic[2] = { 0 }; gsize bytes_read = 0; const char* filename

rpm包安装过程中依赖问题“libc.so.6 is needed by XXX”解决方法

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折腾了几天，终于搞定了CentOS上的Canon LBP2900打印机驱动。中间遇到了一些问题，主要是安装rpm包出现的依赖问题，费尽周折总算是解决了。现在简单总结一下。首先说明一下，我用的 CentOS 版本是 6.6 ，64位。打印机驱动程序是两个rpm安装包： cndrvcups-common-2.60-1.x86_64.rpm 和 cndrvcups-capt-2.60-1.x86_64.rpm 。执行安装命令 rpm -ivh cndrvcups-common-2.60-1.x86_64.rpm ，出现依赖项错误，错误代码如下： [root@cSlave00 RPM]# rpm -ivh cndrvcups-common-2.60-1.x86_64.rpm error: Failed dependencies: libc.so.6 is needed by cndrvcups-common-2.60-1.x86_64 libc.so.6(GLIBC_2.0) is needed by cndrvcups-common-2.60-1.x86_64 libc.so.6(GLIBC_2.1) is needed by cndrvcups-common-2.60-1.x86_64 libc.so.6(GLIBC_2.1.3) is needed by cndrvcups

Calling C++ from Java, but Java loads the wrong Glibc version

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问题 I am trying to call a C++ library from java side and have written necessary jni code. However, when my java code tries to load my C++ library via System.loadLibrary , it complains the following error: Exception in thread "main" java.lang.UnsatisfiedLinkError: libmylib.so: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by libmylib.so) I later found that it is because I have two different GLIBC versions on my system, and the default one is the older one, while libmylib

Calling C++ from Java, but Java loads the wrong Glibc version

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* glibc detected * double free or corruption (fasttop):

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问题 A call to clear on a QByteArray generates the following exception: * glibc detected * /home/yan/FPS2/FPS2: double free or corruption (fasttop): 0 ?? 1 ?? 2 free 3 QByteArray::clear() 4 FPSengine::getDatagrams 5 FPSengine::xmitData 6 FPSengine::getData 7 threadDatalog::run 8 ?? 9 start_thread 10 clone 11 ?? 0 is this a qt bug or could it have something to do with my code? I know QObjects arent thread safe (QT definition not multiple threads calling the same function of the same object instance

Can the MIPS register $0 be used to store and retrieve values?

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问题 When I learned about the MIPS processor, it was pounded into my head that reads of the $0 register always return 0, and writes to $0 are always discarded. From the MIPS Programmer's manual: 2.13.4.1 CPU General-Purpose Registers [...] r0 is hard-wired to a value of zero, and can be used as the target register for any instruction whose result is to be discarded. r0 can also be used as a source when a zero value is needed. From this follows that the instructions or $0,$r31,$0 is a no-op.

Why does a standalone C hello program crash when used as a dynamic linker

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问题 The following program: #include <stdio.h> int main(int argc, char *argv[]) { for (int j = 0; j < argc; j++) printf("%d: %s\n", j, argv[j]); return 0; } built into a statically linked PIE: gcc -g -fpie main.c -static-pie -o ld.so works fine: $ ./ld.so foo bar 0: ./ld.so 1: foo 2: bar But when I use that program as an ELF interpreter for another program: $ gcc -g main.c -Wl,-I./ld.so -o a.out it crashes like so: gdb -q ./a.out (gdb) run Starting program: /tmp/a.out Program received signal