寻找mmap标志值 [英] Looking for mmap flag values

问题描述

我想知道在os x上哪里可以找到mmap标志值. mmap的手册页说使用MAP_PRIVATE，MAP _...等，但是如果要处理汇编，则必须知道进行syscall的实际值.我尝试查找定义这些常量的头文件，但找不到.有人可以链接吗?

I was wondering where I could find mmap flag values on os x. The manpages for mmap say to use MAP_PRIVATE, MAP_... and such, but if you are dealing with assembly you have to know the actual values to make the syscall. I tried looking for the header files that defined these constants but I could not find it. Could someone link it possibly?

推荐答案

在gcc中使用-E选项可让您在预处理器之后查看源文件的输出.在以下源文件上使用gcc -E test.c

Using the -E option with gcc allows you to see the output of a source file after the preprocessor. Using gcc -E test.c on the following source file

#include <sys/mman.h>

int main() {
        return MAP_PRIVATE;
}

输出

...
# 2 "asdf.c" 2

int main() {

 return 0x02;
}

这表明MAP_PRIVATE等于我的系统上的0x02.但是，并非在所有系统上都如此.

which shows that MAP_PRIVATE is equal to 0x02 on my system. This may not be true on all systems, however.

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