My C++ code opens a named pipe and calls gzip ... & at the background, with system() to get the named pipe as input and output compressed text to a file. However, after that the program hangs when opening the named pipe for writing.

My C++ code opens a named pipe and calls gzip ... & at the background, with system() to get the named pipe as input and output compressed text to a file. However, after that the program hangs when opening the named pipe for writing.