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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* Operating System Interface
*
* This provides access to useful OS routines for the sandbox architecture.
* They are kept in a separate file so we can include system headers.
*
* Copyright (c) 2011 The Chromium OS Authors.
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __OS_H__
#define __OS_H__
#include <linux/types.h>
struct sandbox_state;
/**
* Access to the OS read() system call
*
* \param fd File descriptor as returned by os_open()
* \param buf Buffer to place data
* \param count Number of bytes to read
* \return number of bytes read, or -1 on error
*/
ssize_t os_read(int fd, void *buf, size_t count);
/**
* Access to the OS read() system call with non-blocking access
*
* \param fd File descriptor as returned by os_open()
* \param buf Buffer to place data
* \param count Number of bytes to read
* \return number of bytes read, or -1 on error
*/
ssize_t os_read_no_block(int fd, void *buf, size_t count);
/**
* Access to the OS write() system call
*
* \param fd File descriptor as returned by os_open()
* \param buf Buffer containing data to write
* \param count Number of bytes to write
* \return number of bytes written, or -1 on error
*/
ssize_t os_write(int fd, const void *buf, size_t count);
/**
* Access to the OS lseek() system call
*
* \param fd File descriptor as returned by os_open()
* \param offset File offset (based on whence)
* \param whence Position offset is relative to (see below)
* \return new file offset
*/
off_t os_lseek(int fd, off_t offset, int whence);
/* Defines for "whence" in os_lseek() */
#define OS_SEEK_SET 0
#define OS_SEEK_CUR 1
#define OS_SEEK_END 2
/**
* Access to the OS open() system call
*
* \param pathname Pathname of file to open
* \param flags Flags, like O_RDONLY, O_RDWR
* \return file descriptor, or -1 on error
*/
int os_open(const char *pathname, int flags);
#define OS_O_RDONLY 0
#define OS_O_WRONLY 1
#define OS_O_RDWR 2
#define OS_O_MASK 3 /* Mask for read/write flags */
#define OS_O_CREAT 0100
/**
* Access to the OS close() system call
*
* \param fd File descriptor to close
* \return 0 on success, -1 on error
*/
int os_close(int fd);
/**
* Access to the OS exit() system call
*
* This exits with the supplied return code, which should be 0 to indicate
* success.
*
* @param exit_code exit code for U-Boot
*/
void os_exit(int exit_code) __attribute__((noreturn));
/**
* Put tty into raw mode to mimic serial console better
*/
void os_tty_raw(int fd);
/**
* Acquires some memory from the underlying os.
*
* \param length Number of bytes to be allocated
* \return Pointer to length bytes or NULL on error
*/
void *os_malloc(size_t length);
/**
* Free memory previous allocated with os_malloc()/os_realloc()
*
* This returns the memory to the OS.
*
* \param ptr Pointer to memory block to free
*/
void *os_free(void *ptr);
/**
* Reallocate previously-allocated memory to increase/decrease space
*
* This works in a similar way to the C library realloc() function. If
* length is 0, then ptr is freed. Otherwise the space used by ptr is
* expanded or reduced depending on whether length is larger or smaller
* than before.
*
* If ptr is NULL, then this is similar to calling os_malloc().
*
* This function may need to move the memory block to make room for any
* extra space, in which case the new pointer is returned.
*
* \param ptr Pointer to memory block to reallocate
* \param length New length for memory block
* \return pointer to new memory block, or NULL on failure or if length
* is 0.
*/
void *os_realloc(void *ptr, size_t length);
/**
* Access to the usleep function of the os
*
* \param usec Time to sleep in micro seconds
*/
void os_usleep(unsigned long usec);
/**
* Gets a monotonic increasing number of nano seconds from the OS
*
* \return A monotonic increasing time scaled in nano seconds
*/
uint64_t os_get_nsec(void);
/**
* Parse arguments and update sandbox state.
*
* @param state Sandbox state to update
* @param argc Argument count
* @param argv Argument vector
* @return 0 if ok, and program should continue;
* 1 if ok, but program should stop;
* -1 on error: program should terminate.
*/
int os_parse_args(struct sandbox_state *state, int argc, char *argv[]);
/*
* Types of directory entry that we support. See also os_dirent_typename in
* the C file.
*/
enum os_dirent_t {
OS_FILET_REG, /* Regular file */
OS_FILET_LNK, /* Symbolic link */
OS_FILET_DIR, /* Directory */
OS_FILET_UNKNOWN, /* Something else */
OS_FILET_COUNT,
};
/** A directory entry node, containing information about a single dirent */
struct os_dirent_node {
struct os_dirent_node *next; /* Pointer to next node, or NULL */
ulong size; /* Size of file in bytes */
enum os_dirent_t type; /* Type of entry */
char name[0]; /* Name of entry */
};
/**
* Get a directionry listing
*
* This allocates and returns a linked list containing the directory listing.
*
* @param dirname Directory to examine
* @param headp Returns pointer to head of linked list, or NULL if none
* @return 0 if ok, -ve on error
*/
int os_dirent_ls(const char *dirname, struct os_dirent_node **headp);
/**
* Get the name of a directory entry type
*
* @param type Type to cehck
* @return string containing the name of that type, or "???" if none/invalid
*/
const char *os_dirent_get_typename(enum os_dirent_t type);
/**
* Get the size of a file
*
* @param fname Filename to check
* @return size of file, or -1 if an error ocurred
*/
ssize_t os_get_filesize(const char *fname);
#endif
|
