diff options
author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2012-02-20 04:08:11 +0100 |
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committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2012-02-20 04:08:11 +0100 |
commit | 4583896ebb051a796430098aab431a47e4920358 (patch) | |
tree | 93f231db8d5e978b61b60bd3198bb024e6a4348b /sysdeps/mach/hurd/ftok.c | |
parent | 0234227d25807a330c27d549b9c17956a2f3fe35 (diff) |
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.
Diffstat (limited to 'sysdeps/mach/hurd/ftok.c')
-rw-r--r-- | sysdeps/mach/hurd/ftok.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/ftok.c b/sysdeps/mach/hurd/ftok.c new file mode 100644 index 0000000000..8d8b5cb269 --- /dev/null +++ b/sysdeps/mach/hurd/ftok.c @@ -0,0 +1,43 @@ +/* Copyright (C) 1995, 1996, 2000, 2005 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sys/ipc.h> +#include <sys/stat.h> + + +/* In the Hurd, we use the second-to-most-significant bit as flag for + private keys. We use a different order of the components so that + the biggest one---the inode number---is affected by this. */ + +key_t +ftok (pathname, proj_id) + const char *pathname; + int proj_id; +{ + struct stat64 st; + key_t key; + + if (__xstat64 (_STAT_VER, pathname, &st) < 0) + return (key_t) -1; + + key = ((st.st_dev & 0xff) | ((proj_id & 0xff) << 8) + | ((st.st_ino & 0x3fff) << 16)); + + return key; +} |