Maximum number of file descriptors that may be passed via SCM_RIGHTS

[Sam Varshavchik <mrsam@xxxxxxxxxxxxxxx>]

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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