头痛啊，Can't connect to MySQL through socket ...

hanxing1026

我用php程序连接mysql数据库，出现:
Can't connect to local MySQL server through socket '/var/run/mysql/mysql.sock' (2)
这样的错误


文件/etc/my.cnf
socket          = /tmp/mysql.sock
是这样配置的。



然后我在/usr/lib/目录下查找了一下：

root@mail:/usr/lib# grep "tmp/mysql.sock" . -R  
Binary file ./mysql/mysql/libmysqlclient.so.14.0.0 matches
Binary file ./mysql/mysql/libmysqlclient.so.14 matches
Binary file ./mysql/mysql/libmysqlclient.so matches
Binary file ./mysql/mysql/libmysqlclient.a matches
Binary file ./mysql/libmysqlclient.so.14 matches
Binary file ./mysql/libmysqlclient.so.14.0.0 matches
Binary file ./libmysqlclient.so.14 matches
Binary file ./libmysqlclient.so.14.0.0 matches
Binary file ./libmysqlclient.so.10.0.0 matches
Binary file ./libmysqlclient.so.10 matches
Binary file ./libmysqlclient.so.6.0.0 matches
Binary file ./libmysqlclient.so.6 matches
Binary file ./libmysqlclient.so.15 matches
Binary file ./libmysqlclient.so.15.0.0 matches
Binary file ./libmysqlclient.so.15.bak matches



root@mail:/usr/lib# grep "/var/run/mysql/mysql.sock" . -R
Binary file ./mysql/libmysqlclient.a matches
Binary file ./mysql/libmysqlclient.so matches
Binary file ./mysql/libmysqlclient.so.12.0.0 matches
Binary file ./mysql/libmysqlclient_r.a matches
Binary file ./mysql/libmysqlclient_r.so.12.0.0 matches
Binary file ./mysql/libmysqlclient.so.12 matches
Binary file ./mysql/libmysqlclient_r.so matches
Binary file ./mysql/libmysqlclient_r.so.12 matches
Binary file ./php/extensions/mysql.so matches
Binary file ./libmysqlclient.so.12.0.0 matches
Binary file ./libmysqlclient.so.12 matches
Binary file ./libmysqlclient.so matches
Binary file ./libmysqlclient_r.so.10 matches
Binary file ./libmysqlclient_r.so.12 matches
Binary file ./libmysqlclient_r.so.12.0.0 matches



我有一个疑惑：难道连接mysql的socket值如 /tmp/mysql.sock 这样的东西是直接 硬编码到库文件中的吗？


我怎么知道php程序连接mysql数据库时是用的那个mysql库文件呢？




乞求达人指点迷津啊