glibc的版本确认

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运行环境为 Ubuntu 22.04

查看系统中安装的libc的软件包

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$ dpkg -l |grep -i libc-bin
ii  libc-bin      2.35-0ubuntu3.1              amd64        GNU C Library: Binaries

采用gnu的接口查询

可以通过man gnu_get_libc_version查看接口的详细信息

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$ cat 003_glibc_verison.c -n
     1	#include <stdio.h>
     2	#include <gnu/libc-version.h>
     3	
     4	void main() {
     5	    printf("GNU C library version: %s\n", gnu_get_libc_version());
     6	    printf("GNU C library release: %s\n", gnu_get_libc_release());
     7	}
$ gcc 003_glibc_verison.c 
$ ./a.out 
GNU C library version: 2.35
GNU C library release: stable
$

ldd命令

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$ ldd --version
ldd (Ubuntu GLIBC 2.35-0ubuntu3.1) 2.35
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.
$

执行libc.so

libc.so是可以直接运行的，如果不能运行，chmod +x添加下执行权限
ldd 一个当前系统中 C 库编写的动态可执行程序，可以查找到使用的libc.so的位置

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$ ldd `which top`|grep -i libc.so
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f3a024b2000)
$ /lib/x86_64-linux-gnu/libc.so.6 
GNU C Library (Ubuntu GLIBC 2.35-0ubuntu3.1) stable release version 2.35.
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 11.2.0.
libc ABIs: UNIQUE IFUNC ABSOLUTE
For bug reporting instructions, please see:
<https://bugs.launchpad.net/ubuntu/+source/glibc/+bugs>.
$