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On Wed, Sep 06, 2017 at 03:30:47PM +0000, Joseph Myers wrote: > While reviewing Linux 4.13 for glibc header changes needed, I noticed > that bits/fcntl-linux.h was missing F_ADD_SEALS etc. from Linux 3.17. > > I didn't find any discussion indicating this omission is deliberate. > Now, these interfaces can only be used with file descriptors created > with memfd_create, and we don't have a memfd_create wrapper in glibc > (a patch was submitted in October 2014, albeit without documentation / > tests, and discussions continued over the next few months, but without > consensus on whether to add the interface - and we still lack any > general consensus on syscall wrappers), but I don't think that's a > reason to exclude the constants from bits/fcntl-linux.h (especially as > the header does not look compatible with simultaneously including > linux/fcntl.h). > > (Some of those 2014/2015 discussions raised concerns about difficulty > using the memfd_create / sealing interface, but those seem to me more > like a question of whether it should be part of the OS-independent GNU > API - in my view, even fairly specialized syscalls ought to have > wrappers added to glibc if not obsolescent, but there may be cases > where we only want to include them in the Linux-specific API and > anything in the OS-independent GNU API should be different - rather > than being relevant to whether constants for use with fcntl should > appear in headers.) > > 2017-09-06 Joseph Myers <joseph@codesourcery.com> > > * sysdeps/unix/sysv/linux/bits/fcntl-linux.h [__USE_GNU] > (F_ADD_SEALS): New macro. > [__USE_GNU] (F_GET_SEALS): Likewise. > [__USE_GNU] (F_SEAL_SEAL): Likewise. > [__USE_GNU] (F_SEAL_SHRINK): Likewise. > [__USE_GNU] (F_SEAL_GROW): Likewise. > [__USE_GNU] (F_SEAL_WRITE): Likewise. I think the change itself is OK. With regards to the changelog entry formatting, I wonder why a more compact form is not used here, e.g. * sysdeps/unix/sysv/linux/bits/fcntl-linux.h [__USE_GNU] (F_ADD_SEALS, F_GET_SEALS, F_SEAL_SEAL, F_SEAL_SHRINK, F_SEAL_GROW, F_SEAL_WRITE): New macros. -- ldv
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