glibc 各个库作用介绍

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. from <<Building Embedded Linux Systems>>