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Date: Tue, 21 Nov 2017 08:06:01 -0800 From: Richard Cochran <richardcochran@...il.com> To: Arnd Bergmann <arnd@...db.de> Cc: Michael Kerrisk <mtk.manpages@...il.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux API <linux-api@...r.kernel.org>, John Stultz <john.stultz@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, Stephen Boyd <sboyd@...eaurora.org> Subject: Re: [PATCH] [man-pages] adjtimex.2: document clock_adjtime On Tue, Nov 21, 2017 at 09:06:37AM +0100, Arnd Bergmann wrote: > > I copied that line from clock_gettime() man page. I suppose we want to > fix change this in both pages, right? Any suggestions for a good way to > express your explanation in the man page? I suppose we don't want to > go into details of the implementation there but still capture the possible > corner cases. Dynamic clockids are a Linux specific extension. This should be explained with a paragraph or two on the gettime man page, along with an example using the macros. #define CLOCKFD 3 #define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD) #define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3)) Then, the adjtimex page can say, see gettime. Let me try to come up with a text over the (USA) holiday weekend. Thanks, Richard
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