无论MAP_ANON和MAP_ANONYMOUS未声明在C SYS / MMAP [英] Both MAP_ANON and MAP_ANONYMOUS undeclared for sys/mmap in C
问题描述
这是从的/ usr / include / sys中/ 包括我的 mman.h 文件：
不知怎的的mmap（）似乎被定义（可与标志0被使用和读/写保护），而不是 MAP_ANON 或 MAP_ANONYMOUS 如下所示：
Somehow mmap() seems to be defined (and can be used with flags 0 and read/write protection), but not MAP_ANON or MAP_ANONYMOUS as indicated below:
#include <sys/mman.h>
int a = MAP_ANON; /* compile error */
int b = MAP_ANONYMOUS; /* also compile error */
我在什么可能是错误的亏损。我用这个makefile编译：
I'm at a loss of what could be wrong. I'm compiling using this makefile:
编辑：原来， MAP_ANONYMOUS 宏在 /usr/include/bits/mman.h 定义但仅如果 __ USE_MISC 定义...
It turns out the MAP_ANONYMOUS macro is defined in /usr/include/bits/mman.h but only if __USE_MISC is defined...
任何帮助就太棒了！
推荐答案
如果你使用GCC，为此发生常见的原因是，你不使用GNU C标准。试着用编译，例如 -std = gnu11 ，看看是否能解决问题。
If you're using GCC, a common reason for this to occur is that you're not using a GNU C standard. Try compiling with, e.g., -std=gnu11, and see if that fixes the problem.
有关GCC的语言标准的详细信息，可以发现 rel=\"nofollow\">。
More information about GCC's language standards can be found here.
GCC还提供了他们提供的正是扩展的非常详尽的列表的这里。
GCC also provides a very exhaustive list of exactly what extensions they provide here.
此外，作为一个侧面说明，它是preferrable使用 MAP_ANONYMOUS 而不是 MAP_ANON ，作为后者是德precated（据男人MMAP ）。
Also, as a side note, it's preferrable to use MAP_ANONYMOUS instead of MAP_ANON, as the latter is deprecated (according to man mmap).
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