查看库的相关信息

1、查看库的函数及变量

nm -D /usr/local/lib/liblog4cplus.so

log4/log4cplus-2.0.8$ nm -D /usr/local/lib/liblog4cplus.so
0000000000034aa0 T log4cplus_add_callback_appender
0000000000033980 T log4cplus_file_reconfigure
0000000000033810 T log4cplus_initialize
0000000000033ba0 T log4cplus_logger_exists
...

2、查看有关库的详细信息，包括段、符号表、重定位表等

objdump -x  /usr/local/lib/liblog4cplus.so

log4/log4cplus-2.0.8$ objdump -x  /usr/local/lib/liblog4cplus.so
/usr/local/lib/liblog4cplus.so:     file format elf64-x86-64
Dynamic Section:
  NEEDED               libstdc++.so.6
  NEEDED               libm.so.6
  NEEDED               libpthread.so.0
  NEEDED               libc.so.6
  NEEDED               ld-linux-x86-64.so.2
  NEEDED               libgcc_s.so.1
  SONAME               liblog4cplus-2.0.so.3

3、查看有关库的详细信息，包括头部、段、符号表等

readelf 命令用于显示 ELF（Executable and Linkable Format）文件的信息，包括共享库

readelf -a  /usr/local/lib/liblog4cplus.so

log4/log4cplus-2.0.8$ readelf -a  /usr/local/lib/liblog4cplus.so
ELF Header:
  Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF64
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              DYN (Shared object file)
  Machine:                           Advanced Micro Devices X86-64
  Version:                           0x1
  Entry point address:               0x2d170
  Start of program headers:          64 (bytes into file)
  Start of section headers:          7745520 (bytes into file)
  Flags:                             0x0
  Size of this header:               64 (bytes)
  Size of program headers:           56 (bytes)
  Number of program headers:         8
  Size of section headers:           64 (bytes)
  Number of section headers:         38
  Section header string table index: 37

?4、查看库所依赖的其他库

ldd  /usr/local/lib/liblog4cplus.so

log4/log4cplus-2.0.8$ ldd  /usr/local/lib/liblog4cplus.so
	linux-vdso.so.1 (0x00007fffd218a000)
	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f67d0f89000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f67d0beb000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f67d09cc000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f67d05db000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f67d15a0000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f67d03c3000)