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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..a6aba15c86 --- /dev/null +++ b/sysdeps/mach/hurd/ftok.c @@ -0,0 +1,43 @@ +/* SysV ftok for Hurd. + Copyright (C) 1995-2015 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + <http://www.gnu.org/licenses/>. */ + +#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 an order of the components different from the generic + code in sysvipc/ftok.c 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; +} |