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Tests for L{twisted.internet.fdesc}.
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Tests for L{fdesc.setNonBlocking} and L{fdesc.setBlocking}.
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L{fdesc.setNonBlocking} sets a file description to non-blocking.
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L{fdesc.setBlocking} sets a file description to blocking.
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Tests for L{fdesc.readFromFD}, L{fdesc.writeToFD}.
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Create a non-blocking pipe that can be used in tests.
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Close pipes.
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Write data to the pipe.
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Read data from the pipe.
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readFromFDr �append)r �l�resr r r �readS s zReadWriteTests.readc C sH | � d�}| �|dk� | �� }| �t|�|� | �dd|� |� dS )z�
Test that the number of bytes L{fdesc.writeToFD} reports as written
with its return value are seen by L{fdesc.readFromFD}.
s hellor N)r$ r r* � assertEqual�len)r �n�sr r r �test_writeAndReada s
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Similar to L{test_writeAndRead}, but use a much larger string to verify
the behavior for that case.
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Verify that reading from a file descriptor with no data does not raise
an exception and does not result in the callback function being called.
N)r r& r r' r+ � assertIsNone)r r( r6 r r r �test_readFromEmpty� s z!ReadWriteTests.test_readFromEmptyc C �" t �| j� | �| �� tj� dS )z�
Test that using L{fdesc.readFromFD} on a cleanly closed file descriptor
returns a connection done indicator.
N)r r r r+ r* r �CONNECTION_DONEr r r r �test_readFromCleanClose� � z&ReadWriteTests.test_readFromCleanClosec C �$ t �| j� | �| �d�tj� dS )z�
Verify that writing with L{fdesc.writeToFD} when the read end is closed
results in a connection lost indicator.
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Verify that reading with L{fdesc.readFromFD} when the read end is
closed results in a connection lost indicator.
N)r r r r+ r* r rB r r r r �test_readFromInvalid� r? z#ReadWriteTests.test_readFromInvalidc C r@ )z�
Verify that writing with L{fdesc.writeToFD} when the write end is
closed results in a connection lost indicator.
rA N)r r r r+ r$ r rB r r r r �test_writeToInvalid� rD z"ReadWriteTests.test_writeToInvalidc C sp t j}dd� }|t _z| �| �d�d� W |t _n|t _w dd� }|t _z| �| �d�d� W |t _dS |t _w )z8
Test error path for L{fdesc.writeTod}.
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Tests for L{fdesc._setCloseOnExec} and L{fdesc._unsetCloseOnExec}.
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import os, errno
try:
os.write(%d, b'lul')
except OSError as e:
if e.errno == errno.EBADF:
os._exit(0)
os._exit(5)
except BaseException:
os._exit(10)
else:
os._exit(20)
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A file descriptor passed to L{fdesc._setCloseOnExec} is not inherited
by a new process image created with one of the exec family of
functions.
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A file descriptor passed to L{fdesc._unsetCloseOnExec} is inherited by
a new process image created with one of the exec family of functions.
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