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How to timeout from reading from named pipe?
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When does the ReadFile function return true on a pipe?
If the lpNumberOfBytesRead parameter is zero when ReadFile returns TRUE on a pipe, the other end of the pipe called the WriteFile function with nNumberOfBytesToWrite set to zero. For more information about pipes, see Pipes. If there is a transaction bound to the file handle, then the function returns data from the transacted view of the file.
How is the behavior of the ReadFile function determined?
When reading from a communications device, the behavior of ReadFile is determined by the current communication time-out as set and retrieved by using the SetCommTimeouts and GetCommTimeouts functions. Unpredictable results can occur if you fail to set the time-out values. For more information about communication time-outs, see COMMTIMEOUTS.
When to call the ReadFile function in Win32?
The ReadFile function returns when one of the following conditions occur: 1 The number of bytes requested is read. 2 A write operation completes on the write end of the pipe. 3 An asynchronous handle is being used and the read is occurring asynchronously. 4 An error occurs.
When to use timeout in read ( ) function?
You don’t say what the OS is but if you’re running under Linux, you could use the select call. It returns if there is something to read on the file descriptor or you can set it up so that it will timeout if there is nothing to read.
Can a time out cause a WriteFile to fail?
Time-outs can cause a ReadFile, ReadFileEx, WriteFile, or WriteFileEx operation to conclude when a time-out interval elapses, even though the specified number of characters have not been read or written.
How to Time Out ReadFile in Windows 10?
1 If there are characters in the input buffer, ReadFile returns immediately with the characters in the buffer. 2 If there are no characters in the input buffer, ReadFile waits until a character arrives and then returns immediately. 3 If no characters arrive within the time specified by ReadTotalTimeoutConstant , ReadFile times out.
When does a time out occur in Win32?
Time-outs can cause a ReadFile, ReadFileEx, WriteFile, or WriteFileEx operation to conclude when a time-out interval elapses, even though the specified number of characters have not been read or written. It is not treated as an error when a time-out occurs during a read or write operation (that is, the read or write function’s return value