syscall_open.c
1.62 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2015-01-28 Bernard first version
*/
#include <rtthread.h>
#include <LowLevelIOInterface.h>
#include <fcntl.h>
#include <compiler_private.h>
#define DBG_TAG "dlib.syscall.open"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
/*
* The "__open" function opens the file named "filename" as specified
* by "mode".
*/
#pragma module_name = "?__open"
int __open(const char *filename, int mode)
{
#ifdef DFS_USING_POSIX
int handle;
int open_mode = O_RDONLY;
if (mode & _LLIO_CREAT)
{
open_mode |= O_CREAT;
/* Check what we should do with it if it exists. */
if (mode & _LLIO_APPEND)
{
/* Append to the existing file. */
open_mode |= O_APPEND;
}
if (mode & _LLIO_TRUNC)
{
/* Truncate the existsing file. */
open_mode |= O_TRUNC;
}
}
if (mode & _LLIO_TEXT)
{
/* we didn't support text mode */
}
switch (mode & _LLIO_RDWRMASK)
{
case _LLIO_RDONLY:
break;
case _LLIO_WRONLY:
open_mode |= O_WRONLY;
break;
case _LLIO_RDWR:
/* The file should be opened for both reads and writes. */
open_mode |= O_RDWR;
break;
default:
return _LLIO_ERROR;
}
handle = open(filename, open_mode, 0);
if (handle < 0)
{
return _LLIO_ERROR;
}
return handle;
#else
LOG_W(_WARNING_WITHOUT_FS);
return _LLIO_ERROR;
#endif /* DFS_USING_POSIX */
}