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Re: [PATCH] linux-generic: avoid "redefined" warnings for open_not_cancel{,_2}

> Fair enough, but my concern was: what guard?  Should I be very explicit and use
> 
> #ifndef _SYSDEPS_UNIX_SYSV_LINUX_GENERIC_NOT_CANCEL_H
> # define _SYSDEPS_UNIX_SYSV_LINUX_GENERIC_NOT_CANCEL_H
> ...
> #endif

That is OK but we've usually been not quite so verbose and just use a name
that is sufficiently unique, e.g. _LINUX_GENERIC_NOT_CANCEL_H.
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