diff options
Diffstat (limited to 'libdiskfs/io-pathconf.c')
| -rw-r--r-- | libdiskfs/io-pathconf.c | 56 |
1 files changed, 53 insertions, 3 deletions
diff --git a/libdiskfs/io-pathconf.c b/libdiskfs/io-pathconf.c index 0b80b14e..38e277c3 100644 --- a/libdiskfs/io-pathconf.c +++ b/libdiskfs/io-pathconf.c @@ -1,5 +1,5 @@ /* libdiskfs implementation of io.defs: io_pathconf - Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation + Copyright (C) 1992, 1993, 1994, 1995, 1999 Free Software Foundation This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as @@ -15,16 +15,66 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#include <unistd.h> #include "priv.h" #include "io_S.h" +#include <dirent.h> +#include <limits.h> /* Implement io_pathconf as described in <hurd/io.defs>. */ kern_return_t diskfs_S_io_pathconf (struct protid *cred, - int name __attribute__ ((unused)), int *value) + int name, + int *value) { if (!cred) return EOPNOTSUPP; - *value = 0; /* XXX */ + + switch (name) + { + case _PC_LINK_MAX: + *value = diskfs_link_max; + break; + + case _PC_MAX_CANON: + case _PC_MAX_INPUT: + case _PC_PIPE_BUF: + case _PC_VDISABLE: + case _PC_SOCK_MAXBUF: + case _PC_PATH_MAX: + *value = -1; + break; + + case _PC_NAME_MAX: + /* <hurd/hurd_types.defs> string_t constrains the upper bound. + The `struct dirent' format defined by libc further contrains it. */ +#define D_NAMLEN_MAX (UCHAR_MAX * sizeof (((struct dirent *) 0)->d_namlen)) + if (diskfs_name_max > D_NAMLEN_MAX || diskfs_name_max < 0) + diskfs_name_max = D_NAMLEN_MAX; + *value = diskfs_name_max; + break; + + case _PC_NO_TRUNC: /* enforced in diskfs_lookup */ + *value = 1; /* diskfs_name_max >= 0; */ /* see above */ + break; + + case _PC_CHOWN_RESTRICTED: + case _PC_SYNC_IO: + case _PC_ASYNC_IO: + *value = 1; + break; + + case _PC_PRIO_IO: + *value = 0; + break; + + case _PC_FILESIZEBITS: + *value = 32; + break; + + default: + return EINVAL; + } + return 0; } |