fcntl(2) error: pipe-size-max vs pipe-max-size

fcntl(2) error: pipe-size-max vs pipe-max-size

[Matthew Gregan]

Hi,

In the man page for fcntl(2), within the paragraph discussing F_SETPIPE_SZ,
it is claimed that the maximum size for a pipe is determined by the value of
/proc/sys/fs/pipe-size-max.  The proc path is incorrect--on my current
machine (2.6.35.14-106.fc14.x86_64) and in the latest kernel source
(http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=kernel/sysctl.c;h=f487f257e05e4f1dc8836ded96ca36556b048706;hb=HEAD#l1523),
the proc path is /proc/sys/fs/pipe-max-size.

Cheers,
-mjg
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Re: fcntl(2) error: pipe-size-max vs pipe-max-size

[Michael Kerrisk (man-pages)]

Hello Matthew,

On Tue, Feb 14, 2012 at 1:04 PM, Matthew Gregan <kinetik-QufbIeIr5AY@public.gmane.org> wrote:
> Hi,
>
> In the man page for fcntl(2), within the paragraph discussing F_SETPIPE_SZ,
> it is claimed that the maximum size for a pipe is determined by the value of
> /proc/sys/fs/pipe-size-max.  The proc path is incorrect--on my current
> machine (2.6.35.14-106.fc14.x86_64) and in the latest kernel source
> (http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=kernel/sysctl.c;h=f487f257e05e4f1dc8836ded96ca36556b048706;hb=HEAD#l1523),
> the proc path is /proc/sys/fs/pipe-max-size.

Thanks for the report. Of course you are right, and this is fixed for
man-pages-3.38.

Cheers,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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