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
|
try:
import uerrno
import uos
except ImportError:
print("SKIP")
raise SystemExit
try:
uos.VfsFat
except AttributeError:
print("SKIP")
raise SystemExit
class RAMFS:
SEC_SIZE = 512
def __init__(self, blocks):
self.data = bytearray(blocks * self.SEC_SIZE)
def readblocks(self, n, buf):
#print("readblocks(%s, %x(%d))" % (n, id(buf), len(buf)))
for i in range(len(buf)):
buf[i] = self.data[n * self.SEC_SIZE + i]
def writeblocks(self, n, buf):
#print("writeblocks(%s, %x)" % (n, id(buf)))
for i in range(len(buf)):
self.data[n * self.SEC_SIZE + i] = buf[i]
def ioctl(self, op, arg):
#print("ioctl(%d, %r)" % (op, arg))
if op == 4: # BP_IOCTL_SEC_COUNT
return len(self.data) // self.SEC_SIZE
if op == 5: # BP_IOCTL_SEC_SIZE
return self.SEC_SIZE
try:
bdev = RAMFS(50)
except MemoryError:
print("SKIP")
raise SystemExit
uos.VfsFat.mkfs(bdev)
vfs = uos.VfsFat(bdev)
uos.mount(vfs, '/ramdisk')
uos.chdir('/ramdisk')
# file IO
f = open("foo_file.txt", "w")
print(str(f)[:17], str(f)[-1:])
f.write("hello!")
f.flush()
f.close()
f.close() # allowed
try:
f.write("world!")
except OSError as e:
print(e.args[0] == uerrno.EINVAL)
try:
f.read()
except OSError as e:
print(e.args[0] == uerrno.EINVAL)
try:
f.flush()
except OSError as e:
print(e.args[0] == uerrno.EINVAL)
try:
open("foo_file.txt", "x")
except OSError as e:
print(e.args[0] == uerrno.EEXIST)
with open("foo_file.txt", "a") as f:
f.write("world!")
with open("foo_file.txt") as f2:
print(f2.read())
print(f2.tell())
f2.seek(0, 0) # SEEK_SET
print(f2.read(1))
f2.seek(0, 1) # SEEK_CUR
print(f2.read(1))
f2.seek(2, 1) # SEEK_CUR
print(f2.read(1))
f2.seek(-2, 2) # SEEK_END
print(f2.read(1))
# using constructor of FileIO type to open a file
# no longer working with new VFS sub-system
#FileIO = type(f)
#with FileIO("/ramdisk/foo_file.txt") as f:
# print(f.read())
# dirs
vfs.mkdir("foo_dir")
try:
vfs.rmdir("foo_file.txt")
except OSError as e:
print(e.args[0] == 20) # uerrno.ENOTDIR
vfs.remove("foo_file.txt")
print(list(vfs.ilistdir()))
# Here we test that opening a file with the heap locked fails correctly. This
# is a special case because file objects use a finaliser and allocating with a
# finaliser is a different path to normal allocation. It would be better to
# test this in the core tests but there are no core objects that use finaliser.
import micropython
micropython.heap_lock()
try:
vfs.open('x', 'r')
except MemoryError:
print('MemoryError')
micropython.heap_unlock()
# Here we test that the finaliser is actually called during a garbage collection.
import gc
N = 4
for i in range(N):
n = 'x%d' % i
f = vfs.open(n, 'w')
f.write(n)
f = None # release f without closing
[0, 1, 2, 3] # use up Python stack so f is really gone
gc.collect() # should finalise all N files by closing them
for i in range(N):
with vfs.open('x%d' % i, 'r') as f:
print(f.read())
|
