Glib logging file

Log a message with structured data. If the message is fatal i. See the documentation for GLogWriterFunc for information on chaining writers.

The structured data is provided as key—value pairs, where keys are UTF-8 strings, and values are arbitrary pointers — typically pointing to UTF-8 strings, but that is not a requirement. The keys for structured data should follow the systemd journal fields specification. It is suggested that custom keys are namespaced according to the code which sets them. The default writer function for stdout and stderr will automatically append a new-line character after the message, so you should not add one manually to the format string.

Log a message with structured data, accepting the data within a GVariant. This version is especially useful for use in other languages, via introspection. In this case the message is handled as binary and will be forwarded to the log writer as such. Otherwise it will be truncated to this size. Writer function for log entries. A log entry is a collection of one or more GLogFields , using the standard field names from journal specification.

Writer functions must ignore fields which they do not recognise, unless they can write arbitrary binary output, as field values may be arbitrary binary.

This allows writer functions to be chained and fall back to simpler handlers in case of failure. Set a writer function which will be called to format and write out each log message. If so, they can safely be used when formatting log messages. Invalid file descriptors are accepted and return FALSE , which allows for the following construct without needing any additional error handling:. Format a structured log message as a string suitable for outputting to the terminal or elsewhere.

It does not include values from unknown fields. It is encoded in the character set of the current locale, which is not necessarily UTF Format a structured log message and send it to the systemd journal as a set of key—value pairs.

All fields are sent to the journal, but if a field has length zero indicating program-specific data then only its key will be sent.

This is suitable for use as a GLogWriterFunc. Format a structured log message and print it to either stdout or stderr , depending on its log level. Only fields which are understood by this function are included in the formatted string which is printed. Format a structured log message and output it to the default log destination for the platform. On Linux, this is typically the systemd journal, falling back to stdout or stderr if running from the terminal or if output is being redirected to a file.

For instance: What operating system and version For Linux, what version of the C library And anything else you think is relevant. How to reproduce the bug. Otherwise, please include a short test program that exhibits the behavior. As a last resort, you can also provide a pointer to a larger piece of software that can be downloaded.

If the bug was a crash, the exact text that was printed out when the crash occurred. Further information such as stack traces may be useful, but is not necessary. If the patch fixes an existing issue, please refer to the issue in your commit message with the following notation for issue : Closes: Releases tags.

Packages 0 No packages published. So far, this is very similar to the older logging facility. The advantage of structured logs is that you can put multiple fields into the log without resorting to formatting it all into a string. Instead, you pass an array of log fields, which are key-value pairs. You can also invent your own fields.

So GLib has two separate logging facilities now. These are especially handy for logging entire Telnet sessions with every negotiation and byte transferred easily trackable. This is really quite lame because then I have to go back in and re-add all my logging stuff. So really, what I wanted was a way to show logging information only on development builds and then an easy way to turn it off without deleting all of it for releases.