Link library glibc File explanation

Document directory

• Link file of glibc

Link file of glibc [edit]

Actual shared Link Library

This type of file name format is libLIBRAY_NAME-GLIBC_VERSION.so, where libray_name is the name of the linked library,

Glibc_version is the version number of the suite using glibc, and the name of the mathematical Linked Library for the glibc-2.2.3 is the libm-2.2.3.so

Libm is libray_name, while 2.2.3 is the libm version, the actual shared link library of the glibc-2.2.3 is the libc-2.2.3.so

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Symbolic Link of the primary Revision

The main modified version of the symbolic link to the actual glibc version is different, with glibc2.2.3 actual shared link library as the libc-2.2.3.so

The symbolic link to its primary revision is 6, and, relatively speaking, the primary revision of the libdl-2.2.3.so is numbered 2

The format of the symbolic link name of the master revision:

Liblibrary_name.so.major_revision_version

Liblibrary_name is the name of the Linked Library.

Major_revision_versio is the number of the master version of the Linked Library.

Dubuntu @ euwy-LAPTOP:/Lib $ LS-l libc. so.6

Lrwxrwxrwx 1 Root 13 libc. so.6-> libc-2.3.6.so

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A version-independent symbolic link pointing to a main revision.

The main function of these symbolic links is to provide a general entry for all programs that need to link to a specific link library, regardless of the version of the main revision.

Symbol format:

Liblibrary_name.so

For example, libm. So points to libm. so.6, while libm. so.6 points to the libm-2.2.3.so.

$ LS-l libm. So

Lrwxrwxrwx 1 dubuntu users 9 2007-03-24 11: 05 libm. So-> libm. so.6

$ LS-l libm. so.6

Lrwxrwxrwx 1 dubuntu users 13 libc. so.6-> libc-2.3.2.so

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Static Link Library package file

These migration packages will be used by applications that select to link the library statically.

Static Link Library package file format:

Liblibrary_name.a

Example: static package file libdl.

When embedding and porting, we only need to transplant the symbolic links of the actual shared Link Library and the master revision library,

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Prompt for reference of the link library component and root file system of glibc

Link Library component	Internal capacity	Reference prompt
LD	Dynamic linker	Required
Libbrokernlocale	Fixes the process and allows applications with problematic local features to run normally.	Rarely used
Libsegfault	Used to capture memory segment errors and the process of Jinxin backtracking	Rarely used
Libanl	Asynchronous name query Process	Rarely used
Libc	Master C-Linked Library Process	Required
Libcrypt	Cryptographic Process	Most authentication programs, such as Apache
Libdl	Used to dynamically load the process of the shared object	The program that uses the dlopen () function will use
Libm	Mathematical process of glibc	Mathematical functions
Libmemusage	Processes used for heap and stack memory statistics	Rarely used
Libnsl	Nis network service connection process	Rarely used
Libnss_compat	This process is compatible with NIs and name switch Service (NSS ).	Automatically loaded by glibc NSS
Libnss_dns	Dns nss Process	Automatically loaded by glibc NSS
Libnss_files	File query NSS Process	Automatically loaded by glibc NSS
Libnss_hesiod	Nss process of Hesiod Name Service	Automatically loaded by glibc NSS
Libnss_nis	Nis nss Process	Automatically loaded by glibc NSS
Libnss_nisplus	NSS process of NIS Plus	Automatically loaded by glibc NSS
Libpcprofile	Program recorder statistics process	Rarely used
Libpthread	Linux POSIX 1003.1c Multithreading	Multithreading is required
Libresolv	Name parser Process	Name to be resolved
Librt	Asynchronous debugging process	Rarely used