linux-kernel - Re: [PATCH] Move the scope of the FD_SET, FD_CLR, FD_SETSIZE, FD_ISSET, and FD_SERO to the linux/posix_types.h scope and out of the linux/time.h scope.

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Date:	Tue, 07 Dec 2010 20:27:30 -0800
From:	john stultz <johnstul@...ibm.com>
To:	ckhardin@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Move the scope of the FD_SET, FD_CLR, FD_SETSIZE,
 FD_ISSET, and FD_SERO to the linux/posix_types.h scope and out of the
 linux/time.h scope.

On Tue, 2010-12-07 at 18:29 -0800, ckhardin@...il.com wrote:
> From: Charles Hardin <chardin@...bus.dhcp.2wire.com>
> 
> This is a change to address a conflict in a time utility library that
> was using the kernel version of timespec and picked up the FD_SET macros
> and which caused a redefinition compiler error
> 
> Signed-off-by: Charles Hardin <ckhardin@...il.com>

No objection here, but I'm not sure if I'm the best to review this, as
I'm not as familiar with the users of FD_*.

thanks
-john


> ---
>  include/linux/posix_types.h |   12 ++++++++++++
>  include/linux/time.h        |    8 --------
>  2 files changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/include/linux/posix_types.h b/include/linux/posix_types.h
> index f04c98c..c49ce52 100644
> --- a/include/linux/posix_types.h
> +++ b/include/linux/posix_types.h
> @@ -33,6 +33,18 @@
>  #undef __FDMASK
>  #define	__FDMASK(d)	(1UL << ((d) % __NFDBITS))
> 
> +#if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)
> +
> +#define NFDBITS			__NFDBITS
> +
> +#define FD_SETSIZE		__FD_SETSIZE
> +#define FD_SET(fd,fdsetp)	__FD_SET(fd,fdsetp)
> +#define FD_CLR(fd,fdsetp)	__FD_CLR(fd,fdsetp)
> +#define FD_ISSET(fd,fdsetp)	__FD_ISSET(fd,fdsetp)
> +#define FD_ZERO(fdsetp)		__FD_ZERO(fdsetp)
> +
> +#endif /* not kernel and not glibc */
> +
>  typedef struct {
>  	unsigned long fds_bits [__FDSET_LONGS];
>  } __kernel_fd_set;
> diff --git a/include/linux/time.h b/include/linux/time.h
> index 9f15ac7..6e612a4 100644
> --- a/include/linux/time.h
> +++ b/include/linux/time.h
> @@ -254,14 +254,6 @@ static __always_inline void timespec_add_ns(struct timespec *a, u64 ns)
>  }
>  #endif /* __KERNEL__ */
> 
> -#define NFDBITS			__NFDBITS
> -
> -#define FD_SETSIZE		__FD_SETSIZE
> -#define FD_SET(fd,fdsetp)	__FD_SET(fd,fdsetp)
> -#define FD_CLR(fd,fdsetp)	__FD_CLR(fd,fdsetp)
> -#define FD_ISSET(fd,fdsetp)	__FD_ISSET(fd,fdsetp)
> -#define FD_ZERO(fdsetp)		__FD_ZERO(fdsetp)
> -
>  /*
>   * Names of the interval timers, and structure
>   * defining a timer setting:


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