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1 /*
2  * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3  * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without modification,
6  * are permitted provided that the following conditions are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice, this list of
9  *    conditions and the following disclaimer.
10  *
11  * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12  *    of conditions and the following disclaimer in the documentation and/or other materials
13  *    provided with the distribution.
14  *
15  * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16  *    to endorse or promote products derived from this software without specific prior written
17  *    permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #ifndef __INCLUDE_FS_FDTABLE_H
33 #define __INCLUDE_FS_FDTABLE_H
34 
35 #include <limits.h>
36 #include <sys/select.h>
37 #include <semaphore.h>
38 #include "linux/spinlock.h"
39 
40 /* open file table for process fd */
41 struct file_table_s {
42     intptr_t sysFd; /* system fd associate with the tg_filelist index */
43 };
44 
45 struct fd_table_s {
46     unsigned int max_fds;
47     struct file_table_s *ft_fds; /* process fd array associate with system fd */
48     fd_set *proc_fds;
49     fd_set *cloexec_fds;
50     sem_t ft_sem; /* manage access to the file table */
51 };
52 
53 struct files_struct {
54     int count;
55     struct fd_table_s *fdt;
56     unsigned int file_lock;
57     unsigned int next_fd;
58 #ifdef VFS_USING_WORKDIR
59     spinlock_t workdir_lock;
60     char workdir[PATH_MAX];
61 #endif
62 #ifdef LOSCFG_CHROOT
63     struct Vnode *rootVnode;
64 #endif
65 };
66 
67 typedef struct ProcessCB LosProcessCB;
68 
69 void files_refer(int fd);
70 
71 int files_close_internal(int fd, LosProcessCB *processCB);
72 
73 struct files_struct *dup_fd(struct files_struct *oldf);
74 
75 struct files_struct *alloc_files(void);
76 
77 void delete_files(struct files_struct *files);
78 
79 struct files_struct *create_files_snapshot(const struct files_struct *oldf);
80 
81 void delete_files_snapshot(struct files_struct *files);
82 
83 int alloc_fd(int minfd);
84 
85 void alloc_std_fd(struct fd_table_s *fdt);
86 
87 void FileTableLock(struct fd_table_s *fdt);
88 
89 void FileTableUnLock(struct fd_table_s *fdt);
90 
91 struct fd_table_s *GetFdTable(void);
92 #endif
93