diff options
Diffstat (limited to 'libdiskfs/file-get-trans.c')
| -rw-r--r-- | libdiskfs/file-get-trans.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/libdiskfs/file-get-trans.c b/libdiskfs/file-get-trans.c new file mode 100644 index 00000000..118222be --- /dev/null +++ b/libdiskfs/file-get-trans.c @@ -0,0 +1,138 @@ +/* libdiskfs implementation of fs.defs: file_get_translator + Copyright (C) 1992,93,94,95,96,98,99 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + This program 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include "priv.h" +#include <hurd/paths.h> +#include <string.h> +#include <stdio.h> +#include "fs_S.h" + +/* Implement file_get_translator as described in <hurd/fs.defs>. */ +kern_return_t +diskfs_S_file_get_translator (struct protid *cred, + char **trans, + u_int *translen) +{ + struct node *np; + error_t error = 0; + + if (!cred) + return EOPNOTSUPP; + + np = cred->po->np; + + mutex_lock (&np->lock); + + /* First look for short-circuited translators. */ + if (S_ISLNK (np->dn_stat.st_mode)) + { + unsigned int len = sizeof _HURD_SYMLINK + np->dn_stat.st_size + 1; + int amt; + assert (diskfs_shortcut_symlink); + if (len > *translen) + *trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0); + bcopy (_HURD_SYMLINK, *trans, sizeof _HURD_SYMLINK); + + if (diskfs_read_symlink_hook) + error = (*diskfs_read_symlink_hook) (np, + *trans + sizeof _HURD_SYMLINK); + if (!diskfs_read_symlink_hook || error == EINVAL) + { + error = diskfs_node_rdwr (np, *trans + sizeof _HURD_SYMLINK, + 0, np->dn_stat.st_size, 0, cred, &amt); + if (!error) + assert (amt == np->dn_stat.st_size); + } + if (!error) + { + (*trans)[sizeof _HURD_SYMLINK + np->dn_stat.st_size] = '\0'; + *translen = len; + } + else if (len > *translen) + munmap (trans, len); + } + else if (S_ISCHR (np->dn_stat.st_mode) || S_ISBLK (np->dn_stat.st_mode)) + { + char *buf; + unsigned int buflen; + + if (S_ISCHR (np->dn_stat.st_mode)) + assert (diskfs_shortcut_chrdev); + else + assert (diskfs_shortcut_blkdev); + + buflen = asprintf (&buf, "%s%c%d%c%d", + (S_ISCHR (np->dn_stat.st_mode) + ? _HURD_CHRDEV + : _HURD_BLKDEV), + '\0', (np->dn_stat.st_rdev >> 8) & 0377, + '\0', (np->dn_stat.st_rdev) & 0377); + buflen++; /* terminating nul */ + + if (buflen > *translen) + *trans = mmap (0, buflen, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0); + bcopy (buf, *trans, buflen); + free (buf); + *translen = buflen; + error = 0; + } + else if (S_ISFIFO (np->dn_stat.st_mode)) + { + unsigned int len; + + len = sizeof _HURD_FIFO; + if (len > *translen) + *trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0); + bcopy (_HURD_FIFO, *trans, sizeof _HURD_FIFO); + *translen = len; + error = 0; + } + else if (S_ISSOCK (np->dn_stat.st_mode)) + { + unsigned int len; + + len = sizeof _HURD_IFSOCK; + if (len > *translen) + *trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0); + bcopy (_HURD_IFSOCK, *trans, sizeof _HURD_IFSOCK); + *translen = len; + error = 0; + } + else + { + if (! (np->dn_stat.st_mode & S_IPTRANS)) + error = EINVAL; + else + { + char *string; + u_int len; + error = diskfs_get_translator (np, &string, &len); + if (!error) + { + if (len > *translen) + *trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0); + bcopy (string, *trans, len); + *translen = len; + free (string); + } + } + } + + mutex_unlock (&np->lock); + + return error; +} |