On unix everything is a file approach of function read(), write(), close() is not supported on Win32.
I want to emulate it but have no idea how to distinguish when sock is socket or fd on WinSocks2.
//returns 1 if `sock` is network socket,
// 0 if `sock` is file desriptor (including stdio, stderr, stdout), ...
// -1 in none of above
int is_net_socket(int sock)
{
// ...?
}
This should work as in :
int mysock = socket(PF_INET, SOCK_STREAM, 0);
int myfd = _open("my_file.txt", _O_RDONLY);
printf("1: %d 2: %d 3: %d 4:%d\n",
is_net_socket(mysock), //1
is_net_socket(myfd), //0
is_net_socket(stdin), //0
is_net_socket(stderr)); //0
// should print "1: 1 2: 0 3: 0 4:0"
How to implement is_net_socket in order to use it as in:
int my_close(int sock)
{
#if ON_WINDOWS
switch( is_net_socket(sock) ) {
case 1: return closesocket(sock);
case 0: return _close(sock);
default: //handle error...
}
#else
return close(sock);
#endif
}