linux nm指令（nm命令），查看动态库函数（动态库中函数、查看库函数）（查看动态库中.so有哪些函数）（nm -D -A）
如果要查找一个函数在哪个动态库下，但目录中有很多动态库，不知道在哪个里面，可以用这条命令一个个查找：（如果不想把其他带后缀的函数也搜索出来，也可以在要搜索的函数后加上。
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示例：
nm -D xxx.so | grep " T "
加上-D参数，打印结果能输出动态库名称：
nm -D -A xxx.so | grep " T "
如果要查找一个函数在哪个动态库下，但目录中有很多动态库，不知道在哪个里面，可以用这条命令一个个查找：（/path/to/directory是要查找的路径）
find /path/to/directory -name "*.so" -exec nm -D -A {} \; | grep "函数名"
比如我要在当前文件夹查找cw_alg_add这个函数：
find . -name "*.so" -exec nm -D -A {} \; | grep "cw_alg_add"
如果不想把其他带后缀的函数也搜索出来，也可以在要搜索的函数后加上$
20230816
利用Linux nm命令查看动态库函数
在开发过程中，有时我们可能需要检查共享库或动态库(.so文件)的符号表。这些符号包括变量名、函数名等，它们为库提供了外部接口。本文将介绍如何使用Linux中的nm命令来实现这一目标。
什么是nm命令？
nm命令用于列出一个目标文件（如可执行文件，.o文件，.so文件等）的符号表。这对于调试或理解代码的工作流非常有用。
下面是nm命令的一般格式：
nm [选项] 文件名
-D或--dynamic：显示动态符号而非所有符号。-A或--print-file-name：在每行输出前加上目标文件名。
如何使用nm命令查看动态库中的函数？
假设我们有一个名为libexample.so的动态库，我们可以使用以下命令查看其公开的函数列表：
nm -D libexample.so
这将输出动态库中所有的动态符号。如果你想要在每行输出前加上目标文件名，可以使用-A选项：
nm -D -A libexample.so
这会生成类似于以下的输出：
libexample.so:0000000000201018 B __bss_start
libexample.so:0000000000201018 b completed.7697
libexample.so:0000000000000760 t deregister_tm_clones
libexample.so:0000000000000830 t frame_dummy
libexample.so:0000000000000856 T _Z7averagePdRd
libexample.so:0000000000201010 D _edata
libexample.so:0000000000201020 B _end
libexample.so:0000000000000954 T _fini
libexample.so:0000000000000890 T _init
libexample.so:00000000000008c0 t register_tm_clones
libexample.so:0000000000201010 b dtor_idx.7696
其中"T"表示该符号在TEXT(代码)段中，"B"和"b"表示符号在未初始化数据段(BSS)中，"D"表示符号在已初始化数据段(DATA)中，小写字母表示局部符号，大写字母表示全局符号。
深入探索：nm命令的高级用法
除了基本的功能之外，nm命令还提供了一些高级选项，例如，你可以通过-S选项获取每个符号的大小：
nm -S -D libexample.so
另外，-C选项可以将符号名称解码，使得输出更易读：
nm -C -D libexample.so
以上就是如何使用nm命令查看动态库函数的全面指南。
参考资料：
- “nm” man page: https://man7.org/linux/man-pages/man1/nm.1.html
- Stack Overflow thread: https://stackoverflow.com/questions/34732/how-do-i-list-the-symbols-in-a-so-file
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