如何知道在哪个库中定义了特定的函数？ [英] How to know which library a specific function is defined in?

问题描述

[root@xxx memcached-1.4.5]# objdump -R memcached-debug |grep freeaddrinfo
0000000000629e10 R_X86_64_JUMP_SLOT  freeaddrinfo

...

(gdb) disas freeaddrinfo
Dump of assembler code for function freeaddrinfo:
0x00000037aa4baf10 <freeaddrinfo+0>:    push   %rbp
0x00000037aa4baf11 <freeaddrinfo+1>:    push   %rbx
0x00000037aa4baf12 <freeaddrinfo+2>:    mov    %rdi,%rbx

所以我知道 freeaddrinfo 是一个动态链接函数，但是如何知道它定义在哪个 .so ？

So I know freeaddrinfo is a dynamically linked function,but how to know which .so it's defined in?

推荐答案

请参阅此回答。 info符号freeadrinfo 是一种查找方式。

See this answer. The info symbol freeadrinfo is one way to find out.

在Linux和Solaris上，您还可以使用 ldd 和 LD_DEBUG =符号。例如，如果你想知道 / bin / date 中的 localtime 来自哪里：

On Linux and Solaris you can also use ldd and LD_DEBUG=symbols. For example, if you wanted to find out where localtime in /bin/date is coming from:

LD_DEBUG=bindings ldd -r /bin/date 2>&1 |  grep localtime
     26322: binding file /bin/date [0] to /lib/libc.so.6 [0]: normal symbol `localtime' [GLIBC_2.2.5]

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