3.6. Logging

Specializations of the Logger class can write logs to files, but also use various logging APIs. This page collects reference documentation of those APIs, as well as example command lines to read those logs. The System_Logger typedef will be defined to be one of those classes depending on the OS detected at compile time.

• Android_Logger:

  • https://developer.android.com/ndk/reference/group/logging

  • adb logcat -s log_tag -v color

• Apple_Logger:

  • https://developer.apple.com/documentation/os/logger

  • https://developer.apple.com/documentation/os/1643744-os_log_create

  • https://developer.apple.com/documentation/os/os_log_with_type

  • log stream --level info --predicate 'category=="log_tag"'

  • log stream --level info --predicate 'subsystem=="org.joedb"'

• Posix_Logger:

  • https://man7.org/linux/man-pages/man3/syslog.3.html

  • sudo tail -f /var/log/syslog | grep log_tag

• systemd (not yet supported by joedb)

  • https://www.freedesktop.org/software/systemd/man/latest/sd_journal_send.html

  • https://www.loggly.com/ultimate-guide/linux-logging-with-systemd/