On Tue, Dec 16, 2014 at 2:34 PM, Rob Landley <[email protected]> wrote:
>> This *roughly* corresponds to xsendfile(), but returning an off_t.
>
> ssize_t according to man 2 sendfile. I just hadn't yet because nothing
> was using it. If I expand it, I'd want to move towards convergence with
> the syscall... except that gratuitously wants one of its arguments to be
> a network socket for NO OBVIOUS REASON.
...
> I dunno if the genericization work made it upstream or if it needs
> splice() still. (There was talk about it on lwn.net at one point...)
do you have a old version of the man pages?
In Linux kernels before 2.6.33, out_fd must refer to a socket. Since
Linux 2.6.33 it can be any file. If it is a regular file, then send‐
file() changes the file offset appropriately.
this isn't just a man page lie either. though i can't guarantee the
exact kernel version in which this was fixed, Android has relied on
this for many releases now. (both in the C library and the Java
libraries.)
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