Maximum number of file descriptors that may be passed via SCM_RIGHTS

Maximum number of file descriptors that may be passed via SCM_RIGHTS

[Sam Varshavchik]

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Anyone knows if the maximum number of file descriptors that can be passed  
via SCM_RIGHTS is documented anywhere?

Up to at least 2.6.35, I could stuff as many as 255 file descriptors. Which  
sort of made sense.

I updated to Fedora 15, which is based on 2.6.38, and the maximum number of  
file descriptors I can stuff into a message seems to be 253. With 254,  
strace tells me that the kernel refuses with EINVAL.



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Re: Maximum number of file descriptors that may be passed via SCM_RIGHTS

[Michael Kerrisk]

Hello Sam,

On Thu, May 26, 2011 at 1:57 AM, Sam Varshavchik <mrsam-W1w4QoW4mIDgLSHwZvcCBg@public.gmane.org> wrote:
> Anyone knows if the maximum number of file descriptors that can be passed
> via SCM_RIGHTS is documented anywhere?
>
> Up to at least 2.6.35, I could stuff as many as 255 file descriptors. Which
> sort of made sense.
>
> I updated to Fedora 15, which is based on 2.6.38, and the maximum number of
> file descriptors I can stuff into a message seems to be 253. With 254,
> strace tells me that the kernel refuses with EINVAL.

No info on this sorry. Let me know if you determine(d) the details.

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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