try: import errno import os except ImportError: print("SKIP") raise SystemExit try: os.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: # MP_BLOCKDEV_IOCTL_BLOCK_COUNT return len(self.data) // self.SEC_SIZE if op == 5: # MP_BLOCKDEV_IOCTL_BLOCK_SIZE return self.SEC_SIZE try: bdev = RAMFS(50) os.VfsFat.mkfs(bdev) except MemoryError: print("SKIP") raise SystemExit vfs = os.VfsFat(bdev) os.mount(vfs, "/ramdisk") os.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.errno == errno.EINVAL) try: f.read() except OSError as e: print(e.errno == errno.EINVAL) try: f.flush() except OSError as e: print(e.errno == errno.EINVAL) try: open("foo_file.txt", "x") except OSError as e: print(e.errno == errno.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.errno == 20) # errno.ENOTDIR vfs.remove("foo_file.txt") print(list(vfs.ilistdir()))