Implement SysV shared memory for GNU/Hurd.

Implement SysV shared memory for GNU/Hurd.

2005-07-11  Marcus Brinkmann  <marcus@gnu.org>

        * hurd/Makefile (routines): Add sysvshm.
        (distribute): Add sysvshm.h.
        * hurd/sysvshm.h: New file.
        * hurd/sysvshm.c: New file.
        * sysdeps/mach/hurd/bits/stat.h (S_IMMAP0): New macro.
        (S_ISPARE): Unset the S_IMMAP0 flag.
        * sysdeps/mach/hurd/ftok.c: New file.
        * sysdeps/mach/hurd/shmat.c: New file.
        * sysdeps/mach/hurd/shmctl.c: New file.
        * sysdeps/mach/hurd/shmdt.c: New file.
        * sysdeps/mach/hurd/bits/posix_opt.h: Define _XOPEN_SHM to 1.

Gbp-Pq: Topic hurd-i386
Gbp-Pq: Name tg-sysvshm.diff