On Nov 30 04:55, Martin Wege via Cygwin wrote:
> Hello,
>
> Does Cygwin have tools (modified /usr/bin/dd ?) to read/write NTFS
> alternate data streams?
No. As you know, the colon is translated to a normal filename
character, and there's no POSIX-like API to expose ADS raw to user
space.
There is, however, an old function we still expose to user space
for backward compat:
#include <sys/cygwin.h>
int cygwin_attach_handle_to_fd (char *name,
int fd,
HANDLE handle,
mode_t bin,
DWORD myaccess);
This allows to sneak in a HANDLE into a Cygwin file descriptor
representation, kind of like this:
HANDLE h;
int fd;
h = CreateFile ("foo:bar", GENERIC_READ, FILE_SHARE_VALID_FLAGS,
NULL, OPEN_EXISTING, 0, NULL);
if (h != INVALID_HANDLE_VALUE)
{
fd = cygwin_attach_handle_to_fd ("foo", -1, h, 0, GENERIC_READ);
if (fd < 0)
bail_out;
}
For the bin parameter, only 0, O_BINARY or O_TEXT are acceptable,
for myaccess, only GENERIC_READ and/or GENERIC_WRITE are acceptable.
Corinna
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