如何得到linux下socket返回的错误代码及描述

Question

在linux下用socket编程，对一个远程机器进行连接，如果连接不成功，socket会返回一个错误代码，根据该代码，我们再分析具体的原因，我想知道这些错误代码与他们的描述信息。

如在windows下，用winsock编程时，如果用socket连接一个不存在的ip则会返回60，表示连接超时！

下面使winsocket的返回代码及相应的描述信息：
我想知道linux下对应的信息！
WSAETIMEDOUT             60   10060
Connection timed out. A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

WSAECONNREFUSED          61   10061
Connection refused. No connection could be made because the target machine actively refused it.  This usually results from trying to connect to a service that is inactive on the foreign host.

WSAELOOP                 62   10062

WSAENAMETOOLONG          63   10063

WSAEHOSTDOWN             64   10064
Host is down. A socket operation failed because the destination host was down.  
A socket operation encountered a dead host.  Networking activity on the local  
host has not been initiated. These conditions are more likely to be indicated  
by the error WSAETIMEDOUT.

WSAEHOSTUNREACH          65   10065
No route to host. A socket operation was attempted to an unreachable host.

WSAENOTEMPTY             66   10066

WSAEPROCLIM              67   10067
Too many processes.A Windows Sockets implementation may have a limit on the  
number of applications that may use it simultaneously. WSAStartup() may fail  
with this error if the limit has been reached.