Package pyraf :: Module subproc :: Class ReadBuf

Class ReadBuf

Output buffer for non-blocking reads on selectable files like pipes and sockets. Init with a file descriptor for the file.

Instance Methods

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__init__(self, fd, maxChunkSize=1024)
Encapsulate file descriptor FD, with optional MAX_READ_CHUNK_SIZE (default 1024).

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fileno(self)

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peekPendingChar(self, timeout=0)
Return, but don't consume, first character of unconsumed output from file, or empty string if none.

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readPendingChar(self)
Consume first character of unconsumed output from file, or empty string if none.

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readPendingChars(self, max=None)
Consume uncomsumed output from FILE, or empty string if nothing pending.

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readPendingLine(self, block=0)
Return pending output from FILE, up to first newline (inclusive).

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readline(self)
Return next output line from file, blocking until it is received.

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read(self, nchars)
Read nchars from input, blocking until they are available.

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Method Details

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peekPendingChar(self, timeout=0)

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Return, but don't consume, first character of unconsumed output from file, or empty string if none. If timeout is set, waits maximum of timeout seconds before returning. Default is timeout=0 (do not wait at all.)

readPendingLine(self, block=0)

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Return pending output from FILE, up to first newline (inclusive).

Does not block unless optional arg BLOCK is true. This may return a partial line if the input line is longer than chunkSize (default 1024) characters.

read(self, nchars)

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Read nchars from input, blocking until they are available. Returns a shorter string on EOF.