[Bug 97491] New: sendfile man page should mention short "sends"

[Bug 97491] New: sendfile man page should mention short "sends"

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=97491

            Bug ID: 97491
           Summary: sendfile man page should mention short "sends"
           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: gjasny-S0/GAf8tV78@public.gmane.org
        Regression: No

Hello,

Linux 3.16 (3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt4-1, glibc 2.19-18) seems to
truncate larger requests to 2G (file to file copy):

strace output:
  sendfile(4, 3, [0], 10240000000)        = 2147479552


I know one should expect this behavior from read/write calls but for sendfile
it was somehow unexpected.

Maybe you could mention that fact in the man page for sendfile?

Thanks,
Gregor

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[Bug 97491] sendfile man page should mention short "sends"

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=97491

Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
         Resolution|---                         |CODE_FIX

--- Comment #1 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
I added some text to cover this:

RETURN VALUE
       If the transfer was successful, the number of bytes writ‐
       ten  to  out_fd is returned.  Note that a successful call
       to sendfile() may write fewer bytes than  requested;  the
       caller should be prepared to retry the call if there were
       unsent bytes.

Hopefully that suffices?

Thanks,

Michael

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