Re: Unable to fdopen() a pipe handle

Re: Unable to fdopen() a pipe handle

[Christopher G. Faylor]

In article <5010400024885002000002L022*.cygnus.gnu-win32@MHS>,
Craig Setera <setera@us.ibm.com> wrote:
>I've got a chunk of code that create an anonymous pipe using pipe() and then
>attempts to create a write stream on the pipe using fdopen() (something like
>this... from memory... not necessarily correct):
>
>int mypipe[2];
>FILE *mystream;
>
>pipe(mypipe);
>mystream = fdopen(mypipe[1], "w");
>
>I can't seem to get fdopen() to return anything other than NULL.  Any thoughts?

I just tried this and it works fine for me.  I'd be surprised if it didn't
since this is a very common thing to do.  Try upgrading to a "coolview"
version of cygwin.dll:  http://www.lexa.ru/sos .
-- 
cgf@cygnus.com             "Everything has a boolean value, if you stand
http://www.cygnus.com/      far enough away from it."  -- Galena Alyson Canada
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Re: Unable to fdopen() a pipe handle

[Earnie Boyd]

---Craig Setera <setera@us.ibm.com> wrote:
>
> I've got a chunk of code that create an anonymous pipe using pipe()
and then
> attempts to create a write stream on the pipe using fdopen()
(something like
> this... from memory... not necessarily correct):
> 
> int mypipe[2];
> FILE *mystream;
> 
> pipe(mypipe);
> mystream = fdopen(mypipe[1], "w");
> 
> I can't seem to get fdopen() to return anything other than NULL. 
Any thoughts?

Well, I thought I had some then I started some research.  I've drawn
the conclusion that it won't work because the pipes are half-duplex. 
However, you should be able to fopen a /dev/null and use dup2 to
accomplish what you want (maybe:).

Anybody else?
==
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------ooo0O--O0ooo-------



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RE: Unable to fdopen() a pipe handle

[Sergey Okhapkin]

Craig Setera wrote:
> I've got a chunk of code that create an anonymous pipe using pipe() and then
> attempts to create a write stream on the pipe using fdopen() (something like

Upgrade cygwinb19.dll at least to b19.1.

-- 
Sergey Okhapkin, http://www.lexa.ru/sos
Moscow, Russia.

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Unable to fdopen() a pipe handle

[Craig Setera]

I've got a chunk of code that create an anonymous pipe using pipe() and then
attempts to create a write stream on the pipe using fdopen() (something like
this... from memory... not necessarily correct):

int mypipe[2];
FILE *mystream;

pipe(mypipe);
mystream = fdopen(mypipe[1], "w");

I can't seem to get fdopen() to return anything other than NULL.  Any thoughts?

Craig


Craig Setera
AS/400 Enterprise Java Development
IBM Rochester
setera@us.ibm.com
(507) 253-3387 - Tie: 553-3387
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