如何重新绑定在MacOSX的/ Ubuntu的一个插座?第二次
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25-09-2019 - |
题
我有以下代码:
if ( ( m_mainSocket = ::socket( PF_INET, SOCK_STREAM, IPPROTO_TCP ) ) < 0 )
{
throw Exception( __FILE__, __LINE__ ) << "Unable to create socket";
}
int on( 0 );
if ( setsockopt( m_mainSocket, SOL_SOCKET, SO_REUSEADDR, &on, sizeof( on ) ) )
{
throw Exception( __FILE__, __LINE__ ) << "Can't make server socket resusable.";
}
sockaddr_in addr;
memset( &addr, 0, sizeof( addr ) );
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl( INADDR_ANY );
addr.sin_port = htons( p_localPort );
if ( ::bind( m_mainSocket, reinterpret_cast< sockaddr * >( &addr ), sizeof( addr ) ) < 0 )
{
throw Exception( __FILE__, __LINE__ ) << "Failed to bind the server socket";
}
当我关闭服务器,具有接近(),病程的,我不能再次在相同的端口打开服务器。为什么?我需要更改端口或重新启动系统。这种事只有在Ubuntu和MacOSX的。在Windows中,我没有这个问题。
在::绑定错误happend()函数。它不允许我重新绑定()的插座两次。
我如何重新绑定?
解决方案
您需要通过1,不为0,到REUSEADDR。
从socket(7)
手册页:
Socket Options These socket options can be set by using setsockopt(2) and read with getsockopt(2) with the socket level set to SOL_SOCKET for all sockets: .... SO_REUSEADDR Indicates that the rules used in validating addresses supplied in a bind(2) call should allow reuse of local addresses. For AF_INET sockets this means that a socket may bind, except when there is an active listening socket bound to the address. When the listening socket is bound to INADDR_ANY with a specific port then it is not possible to bind to this port for any local address. Argument is an integer boolean flag.
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