什么是SOCK_DGRAM和SOCK_STREAM？ [英] What is SOCK_DGRAM and SOCK_STREAM?
问题描述
我刚遇到一个奇怪的事情，我发现应用程序默认情况下使用 SOCK_STREAM 函数。为什么会这样呢？这个 SOCK_STREAM 只是创建多个流吗？还是标准的 SOCK_STREAM 函数可用于创建TCP流？
I just came across this strange thing I got to see application is that by default they use SOCK_STREAM function. Why is it so? Is this SOCK_STREAM just creating multiple streams? Or is it the standard SOCK_STREAM function available for creating TCP stream(s)?
我以为海啸是基于UDP的，但仍然具有TCP等一些功能，例如TCP公平性，友好性等。
I thought tsunami is based on UDP, but still having some features like that of TCP, e.g. TCP fairness, friendlyness, etc.
请问有人可以阐明此问题吗？我对此完全感到困惑。
Could somebody please shed some light on this issue? I am totally confused over this.
推荐答案
TCP几乎总是使用 SOCK_STREAM UDP使用 SOCK_DGRAM 。
TCP almost always uses SOCK_STREAM and UDP uses SOCK_DGRAM.
TCP（ SOCK_STREAM ）是基于连接的协议。建立连接并且两方进行对话，直到由于一方之一或网络错误而终止连接。
TCP (SOCK_STREAM) is a connection-based protocol. The connection is established and the two parties have a conversation until the connection is terminated by one of the parties or by a network error.
UDP（ SOCK_DGRAM ）是基于数据报的协议。您发送一个数据报并得到一个答复，然后连接终止。
UDP (SOCK_DGRAM) is a datagram-based protocol. You send one datagram and get one reply and then the connection terminates.
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如果发送多个数据包，TCP承诺会传送它们为了。
UDP没有，因此如果顺序
很重要，则接收方需要检查它们。
If you send multiple packets, TCP promises to deliver them in order. UDP does not, so the receiver needs to check them, if the order matters.
如果TCP数据包丢失，发送方可以告知。
If a TCP packet is lost, the sender can tell. Not so for UDP.
UDP数据报的大小是有限的，从内存来看，我认为它是512
字节。 TCP可以发送更大的集总。
UDP datagrams are limited in size, from memory I think it is 512 bytes. TCP can send much bigger lumps than that.
TCP更加健壮，可以进行更多的检查。 UDP是重量较轻的阴影
（减轻了计算机和网络压力）。
TCP is a bit more robust and makes more checks. UDP is a shade lighter weight (less computer and network stress).
选择合适的协议您想如何与另一台计算机进行交互。
Choose the protocol appropriate for how you want to interact with the other computer.
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