为什么在memset的使用bzero？ [英] Why use bzero over memset?

问题描述

在一个系统编程类我把这个previous学期，我们必须实现C.一个基本的客户机/服务器初始化时结构，如 sock_addr_in ，或字符缓冲区（我们使用的客户端和服务器之间发送数据来回）教授指示我们只使用 bzero ，而不是 memset的初始化它们。他从不解释原因，而且我很好奇，如果有这种正当的理由？

In a Systems Programming class I took this previous semester, we had to implement a basic client/server in C. When initializing the structs, like sock_addr_in, or char buffers (that we used to send data back and forth between client and server) the professor instructed us to only use bzero and not memset to initialize them. He never explained why, and I'm curious if there is a valid reason for this?

我在这里看到：<一href=\"http://fdiv.net/2009/01/14/memset-vs-bzero-ultimate-showdown\">http://fdiv.net/2009/01/14/memset-vs-bzero-ultimate-showdown该 bzero 更有效，由于一个只能将要归零记忆的事实，所以它没有做任何额外的检查 memset的可以这样做。这仍然并不一定看起来像一个理由绝对不是用 memset的因为虽然零内存。

I see here: http://fdiv.net/2009/01/14/memset-vs-bzero-ultimate-showdown that bzero is more efficient due to the fact that is only ever going to be zeroing memory, so it doesn't have to do any additional checking that memset may do. That still doesn't necessarily seem like a reason to absolutely not use memset for zeroing memory though.

bzero 被认为是德precated，此外是不是一个标准的C函数。根据手册， memset的是pferred超过 bzero 为此$ P $。所以，你为什么要仍然使用 bzero 在 memset的？只是为了提高效率，或者是更多的东西？同样，什么是 memset的超过 bzero ，使它成为事实上的$ P $为新的程序pferred选项的好处？

bzero is considered deprecated, and furthermore is a not a standard C function. According to the manual, memset is preferred over bzero for this reason. So why would you want to still use bzero over memset? Just for the efficiency gains, or is it something more? Likewise, what are the benefits of memset over bzero that make it the de facto preferred option for newer programs?

推荐答案

我看不出有任何理由要preFER bzero 在 memset的。

I don't see any reason to prefer bzero over memset.

memset的是一个标准的C函数，而 bzero 从未有过的C标准的功能。理由可能是因为你可以使用实现完全相同的功能 memset的功能。

memset is a standard C function while bzero has never been a C standard function. The rationale is probably because you can achieve exactly the same functionality using memset function.

现在关于效率，编译器像 GCC 使用内置的实现为 memset的其切换到特定的实现，当一个常数 0 进行检测。同为的glibc 时，建宏被禁用。

Now regarding efficiency, compilers like gcc use builtin implementations for memset which switch to a particular implementation when a constant 0 is detected. Same for glibc when builtins are disabled.

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