Re: PROPOSAL: extend pipe() to support NULL argument.

[Changli Gao]

On Tue, Jul 7, 2009 at 12:43 PM, Denys Vlasenko<vda.linux@xxxxxxxxxxxxxx> wrote:
> On Friday 03 July 2009 12:28, Albert ARIBAUD wrote:
>
> As I understand it, the proposal is to make pipe(NULL) return a fd,
> which can be read from and written to. Whatever you write
> is remembered, and can be retrieved by reads later.
>
> standard pipe(two_fds) returns two fds. One is only used for writes.
> Another is only used for reads. Which may be wasteful in some
> situations (like, if you have thousands of pipes).
>
> There is no trick I know of which may be used to "combine"
> these two fds into one, close second one and thus save one fd table slot.
>
Right!

 mkfifo(name);
 open(name, O_RDWR);
 unlink(name);

Is it a trick?


-- 
Regardsï
Changli Gao(xiaosuo@xxxxxxxxx)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/