glibc 各个库作用介绍

Library component	Content	Inclusion guidelines
ld (This library component is not itself a library. Instead, ld.so is an executable invoked by the ELF binary format loader to load the dynamically linked libraries into an application’s memory space.)	Dynamic linker.	Compulsory. Needed to use any shared libraries. Theoretically not necessary if using only a statically built root filesystem—although this is quite rare, unless you are only using BusyBox, for example.
libBrokenLocale	Fixup routines to get applications that have broken locale features to run. Overrides application defaults through preloading. (Need to use LD_PRELOAD.)	Rarely used.
libSegFault	Routines for catching segmentation faults and doing backtraces.	Rarely used.
libanl	Asynchronous name lookup routines.	Rarely used.
libbsd-compat	Dummy library for certain BSD programs that are compiled with -lbsd-compat.	Rarely used.
libc	Main C library routines	Compulsory.
libcrypt	Cryptography routines.	Required for most applications involved in authentication.
libdl	Routines for loading shared objects dynamically	Required for applications that use functions such as dlopen().
libm	Math routines.	Required for math functions.
libmemusage	Routines for heap and stack memory profiling.	Rarely used.
libnsl	NIS network services library routines.	Rarely used.
libnss_compat	Name Switch Service (NSS) compatibility routines for NIS.	Loaded automatically by the glibc NSS
libnss_dns	NSS routines for DNS.	Loaded automatically by the glibc NSS
libnss_files	NSS routines for file lookups.	Loaded automatically by the glibc NSS
libnss_hesiod	NSS routines for Hesiod name service.	Loaded automatically by the glibc NSS
libnss_nis	NSS routines for NIS.	Loaded automatically by the glibc NSS
libnss_nisplus	NSS routines for NIS plus.	Loaded automatically by the glibc NSS
libpcprofile	Program counter profiling routines	Rarely used.
libpthread	POSIX 1003.1c threads routines for Linux.	Required for threads programming.
libresolv	Name resolver routines.	Required for name resolution.
librt	Asynchronous I/O routines.	Rarely used.
libthread_db	Thread debugging routines.	Loaded automatically by gdb when debugging threaded applications. Never actually linked to by any application.
libutil	Login routines, part of the user accounting database.	Required for terminal connection management.

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