On Wed, May 23, 2001 at 04:12:36PM -0600, Craig Nelson wrote:
>Hi All, just looking for a bit more info on
>cygwin_attach_handle_to_fd(): the API references shows it as:
>
>----snip----
>extern "C" int cygwin_attach_handle_to_fd(char *name, int fd, HANDLE handle, int bin,
>int access);
>
>This function can be used to turn a Win32 "handle" into a posix-style
>file handle. fd may be -1 to make cygwin allocate a handle; the actual
>handle is returned in all cases.
>
>----snip----
>
>But I'm wondering what kinds of values BIN, ACCESS, and NAME are expected to have.
>In particular:
>
> -Does NAME have to be a unique string? if so, unique amongst each invocation of
>a cygwin process, etc.
> -Should BIN be set to unix things like O_BINARY | O_RDONLY or win32 things like
>GENERIC_READ, etc.
> -Should ACCESS be set to unix things like S_IRWXU or win32 things like
>FILE_SHARE_READ, etc.
>
>Any help on all the options for this function would be greatly appreciated.
>From inspecting the code:
'name' is the name of the file or device.
'bin' is true if the file should be opened in binary mode, false for text mode.
'access' is a windows setting like 'GENERIC_READ' or 'GENERIC-WRITE'.
>Incase anybody is wondering why I'm needing this: The reason is, I'm
>using CreateProcess(), CreatePipe() and cygwin_attach_handle_to_fd() in
>order to start up a child process and redirect its STDIN, STDOUT, and
>STDERR and use it in my program. It works great except the fd returned
>from attach_handle() appears to never get closed (and therfore read()
>blocks indefinately because it never gets an EOF).
It sounds like you're reinventing "popen" to me.
>I've tried setting BIN and ACCESS to constants shown above (without
>success), and I am wondering If there's something I've not set. I'm
>running NT4sp6a with the latest cygwin-1.3.2 release. please send a
>reply to [EMAIL PROTECTED] (and the list, if desired)
Probably the best thing you could do is inspect the source code. That's
what I just did.
cgf
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