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Chapter 17. Logging

17.1. Logging in C++

The Qpidd broker and C++ clients can both use environment variables to enable logging. Linux and Windows systems use the same named environment variables and values.
  1. Use QPID_LOG_ENABLE to set the level of logging you are interested in (trace, debug, info, notice, warning, error, or critical): 
    export QPID_LOG_ENABLE="warning+"
  2. The Qpidd broker and C++ clients use QPID_LOG_OUTPUT to determine where logging output should be sent. This is either a file name or the special values stderr, stdout, or syslog: 
    export QPID_LOG_TO_FILE="/tmp/myclient.out"
  3. From a Windows command prompt, use the following command format to set the environment variables: 
    set QPID_LOG_ENABLE=warning+
set QPID_LOG_TO_FILE=D:\tmp\myclient.out
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