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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright 2013 Olaf Wintermann. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef VFS_H
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#define VFS_H
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#include "../public/nsapi.h"
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#include "acl.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct VFS_IO VFS_IO;
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typedef struct VFSFile VFSFile;
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struct VFS {
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SYS_FILE (*open)(VFSContext *ctx, char *path, int oflags);
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int (*stat)(VFSContext *ctx, char *path, struct stat *buf);
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int (*fstat)(VFSContext *ctx, SYS_FILE fd, struct stat *buf);
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};
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struct VFSContext {
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Session *sn;
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Request *rq;
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VFS *vfs;
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pool_handle_t *pool;
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User *user;
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ACLListHandle *acllist;
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uint32_t aclreqaccess;
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int vfs_errno;
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};
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struct VFSFile {
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VFSContext *ctx;
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VFS_IO *io; // IO functions
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void *data; // private data used by the VFSFile implementation
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int fd; // native file descriptor if available, or -1
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};
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struct VFS_IO {
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ssize_t (*read)(SYS_FILE fd, void *buf, size_t nbyte);
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ssize_t (*write)(SYS_FILE fd, const void *buf, size_t nbyte);
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void (*close)(SYS_FILE fd);
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};
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/*
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* creates a VFSContext for a Request
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* vfs calls will do ACL checks
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*/
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VFSContext* vfs_request_context(Session *sn, Request *rq);
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SYS_FILE vfs_open(VFSContext *ctx, char *path, int oflags);
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SYS_FILE vfs_openRO(VFSContext *ctx, char *path);
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SYS_FILE vfs_openWO(VFSContext *ctx, char *path);
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SYS_FILE vfs_openRW(VFSContext *ctx, char *path);
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int vfs_stat(VFSContext *ctx, char *path, struct stat *buf);
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int vfs_fstat(VFSContext *ctx, SYS_FILE fd, struct stat *buf);
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void vfs_close(SYS_FILE fd);
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// private
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int sys_acl_check(VFSContext *ctx, uint32_t acm, uid_t *uid, gid_t *gid);
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void sys_set_error_status(VFSContext *ctx);
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ssize_t sys_file_read(SYS_FILE fd, void *buf, size_t nbyte);
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ssize_t sys_file_write(SYS_FILE fd, const void *buf, size_t nbyte);
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void sys_file_close(SYS_FILE fd);
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#ifdef __cplusplus
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}
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#endif
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#endif /* VFS_H */
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