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[[!meta copyright="Copyright © 2012 Free Software Foundation, Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled [[GNU Free Documentation
License|/fdl]]."]]"""]]
[[!meta title="libnetfs: io_map"]]
[[!tag open_issue_hurd]]
This hampers [[hurd/translator/nfs]] usability, for example:
$ fsysopts ./
/hurd/nfs [...]
$ cp -a /bin/true ./
cp: failed to preserve authorship for `./true': Operation not supported
$ ./true
$ /lib/ld.so /bin/true
$ /lib/ld.so $PWD/true
[...]/true: error while loading shared libraries: [...]/true: failed to map segment from shared object: Error 1073741869
IRC, freenode, #hurd, 2012-03-14:
<civodul> i just realized that ld.so uses mmap unconditionally
<civodul> so executables or shared libs can't be used off a netfs-based
file system
<civodul> that's annoying
<tschwinge> civodul: Do you know what it takes to fix libnetfs? I have no
idea.
<tschwinge> Never looked at it.
<civodul> tschwinge: implementing io_map
<civodul> but i think the idea is that io_map typically isn't convenient
for network file systems
<civodul> which is why it doesn't have it
<civodul> the GCS says "thou shall not require mmap" ;-)
<http://lists.gnu.org/archive/html/bug-hurd/2001-10/msg00306.html>. Analysis
to be found on [[glibc/mmap]] page.
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