On 10 May 2015 20:31, 罗勇刚(Yonggang Luo)  wrote:
> For example, the open function exist both in msvcrt and posix,
> int open(const char *path, int oflag, ...);
> 
> But in msvcrt, the path is ANSI encoding, and in posix, path is utf8 encoding,

POSIX has no such encoding requirement on the |path| argument:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html

on Linux, that buffer is a standard NUL-terminated C string which is passed 
directly to the kernel which more or less passes it directly to the fs driver.  
how some FS drivers interpret that string depends on the FS.
-mike