linux-kernel - Re: hi-res mtime userspace interface

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Message-ID: <4793DCB1.1090802@metaparadigm.com>
Date:	Mon, 21 Jan 2008 07:43:45 +0800
From:	Michael Clark <michael@...aparadigm.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: hi-res mtime userspace interface

Stephen Hemminger wrote:
> Look at stat.
>   

Thanks. OK that was what I wanted. I hadn't looked further than man 2 
stat - I think the stat man page needs an update.

> In /usr/include/bits/stat.h:
> struct stat
>   {
>     __dev_t st_dev;		/* Device.  */
> ...
> #ifdef __USE_MISC
>     /* Nanosecond resolution timestamps are stored in a format
>        equivalent to 'struct timespec'.  This is the type used
>        whenever possible but the Unix namespace rules do not allow the
>        identifier 'timespec' to appear in the <sys/stat.h> header.
>        Therefore we have to handle the use of this header in strictly
>        standard-compliant sources special.  */
>     struct timespec st_atim;		/* Time of last access.  */
>     struct timespec st_mtim;		/* Time of last modification.  */
>     struct timespec st_ctim;		/* Time of last status change.  */
> # define st_atime st_atim.tv_sec	/* Backward compatibility.  */
> # define st_mtime st_mtim.tv_sec
> # define st_ctime st_ctim.tv_sec
> #else
>     __time_t st_atime;			/* Time of last access.  */
>     unsigned long int st_atimensec;	/* Nscecs of last access.  */
>     __time_t st_mtime;			/* Time of last modification.  */
>     unsigned long int st_mtimensec;	/* Nsecs of last modification.  */
>     __time_t st_ctime;			/* Time of last status change.  */
>     unsigned long int st_ctimensec;	/* Nsecs of last status change.  */
> #endif
>   

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