> devices.txt in kernel documentation. 
> 2176 <http://www.mjmwired.net/kernel/Documentation/devices.txt#2176>    
> 136-143 char    Unix98 PTY slaves 

Since that document has multiple devices with the same major, I wonder if its
safer to fstatfs() the fd and make sure the f_type is the devpts fs magic
number.  It only seems to be defined in fs/devpts/inode.c though.

> #define DEVPTS_SUPER_MAGIC 0x1cd1

devpts is mounted on /dev/pts before single user mode so it seems to always
be there unless someone unmounts it.  If you try to ssh in without /dev/pts
mounted the ssh hangs.

-- ljk

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