def test_fsync(self):
fsync_file_name = 'text_fsync.txt'
fd = nt.open(fsync_file_name, nt.O_WRONLY | nt.O_CREAT)
# negative test, make sure it raises on invalid (closed) fd
try:
nt.close(fd+1)
except:
pass
self.assertRaises(OSError, nt.fsync, fd+1)
# BUG (or implementation detail)
# On a posix system, once written to a file descriptor
# it can be read using another fd without any additional intervention.
# In case of IronPython the data lingers in a stream which
# is used to simulate file descriptor.
fd2 = nt.open(fsync_file_name, nt.O_RDONLY)
self.assertEqual(nt.read(fd2, 1), b'')
nt.write(fd, b'1')
if is_cli:
self.assertEqual(nt.read(fd2, 1), b'') # this should be visible right away, but is not
nt.fsync(fd)
self.assertEqual(nt.read(fd2, 1), b'1')
nt.close(fd)
nt.close(fd2)
# fsync on read file descriptor
fd = nt.open(fsync_file_name, nt.O_RDONLY)
if not is_cli:
self.assertRaises(OSError, nt.fsync, fd)
nt.close(fd)
# fsync on rdwr file descriptor
fd = nt.open(fsync_file_name, nt.O_RDWR)
nt.fsync(fd)
nt.close(fd)
# fsync on derived fd
if not is_cli:
for mode in ('rb', 'r'):
with open(fsync_file_name, mode) as f:
self.assertRaises(OSError, nt.fsync, f.fileno())
for mode in ('wb', 'w'):
with open(fsync_file_name, mode) as f:
nt.fsync(f.fileno())
nt.unlink(fsync_file_name)
# fsync on pipe ends
r,w = nt.pipe()
if not is_cli:
self.assertRaises(OSError, nt.fsync, r)
nt.write(w, b'1')
if False:
nt.fsync(w) # this blocks
nt.close(w)
nt.close(r)
def test_fsync(self):
fsync_file_name = 'text_fsync.txt'
fd = nt.open(fsync_file_name, nt.O_WRONLY | nt.O_CREAT)
# negative test, make sure it raises on invalid (closed) fd
try:
nt.close(fd+1)
except:
pass
self.assertRaises(OSError, nt.fsync, fd+1)
# BUG (or implementation detail)
# On a posix system, once written to a file descriptor
# it can be read using another fd without any additional intervention.
# In case of IronPython the data lingers in a stream which
# is used to simulate file descriptor.
fd2 = nt.open(fsync_file_name, nt.O_RDONLY)
self.assertEqual(nt.read(fd2, 1), '')
nt.write(fd, '1')
self.assertEqual(nt.read(fd2, 1), '') # this should be visible right away, but is not
nt.fsync(fd)
self.assertEqual(nt.read(fd2, 1), '1')
nt.close(fd)
nt.close(fd2)
# fsync on read file descriptor
fd = nt.open(fsync_file_name, nt.O_RDONLY)
self.assertRaises(OSError, nt.fsync, fd)
nt.close(fd)
# fsync on rdwr file descriptor
fd = nt.open(fsync_file_name, nt.O_RDWR)
nt.fsync(fd)
nt.close(fd)
# fsync on derived fd
for mode in ('rb', 'r'):
f = open(fsync_file_name, mode)
self.assertRaises(OSError, nt.fsync, f.fileno())
f.close()
for mode in ('wb', 'w'):
f = open(fsync_file_name, mode)
nt.fsync(f.fileno())
f.close()
nt.unlink(fsync_file_name)
# fsync on pipe ends
r,w = nt.pipe()
self.assertRaises(OSError, nt.fsync, r)
nt.write(w, '1')
nt.fsync(w)
nt.close(w)
nt.close(r)