[Bug 156231] New: man fcntl isn't clear about how to get seal-related constants

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org]

https://bugzilla.kernel.org/show_bug.cgi?id=156231

            Bug ID: 156231
           Summary: man fcntl isn't clear about how to get seal-related
                    constants
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
          Assignee: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
          Reporter: tom+bugzilla.kernel.org-TykxONGntnP10XsdtD+oqA@public.gmane.org
        Regression: No

man fcntl tells you to include unistd.h and fcntl.h - but to get the
seal-related constants, you need (it seems) to include linux/fcntl.h.

The need for _GNU_SOURCE (etc.) for other constants is called out clearly
enough in the CONFORMING TO section. The directions for the seal-related
constants are a bit unclear.

(Perhaps this is just one of those things you're supposed to know, but pages
such as shm_open and 2 stat show that being clear about the headers is not
without precedent...)

Stack Overflow question:
http://stackoverflow.com/questions/39353442/f-seal-seal-undeclared-even-when-headers-are-included

Thanks,

--Tom

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