dcrd: Support SIGTERM on Win and all unix variants. #2958
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dajohi
approved these changes
Jun 10, 2022
Go 1.14 added runtime support for handling the windows CTRL_CLOSE_EVENT, CTRL_LOGOFF_EVENT, and CTRL_SHUTDOWN_EVENT events by adding a definition for syscall.SIGTERM to windows and converting the events to that signal. It also added definitions for other common signals, including SIGHUP, and treats them as NOOPs on windows. Consequently, this modifies the logic that deals with conditionally handling SIGTERM and SIGHUP to handle them for windows as well as all unix-like operating systems, including newer ones that are supported by Go since the code was originally written. Although the additional signals could probably just be added unconditionally without too much issue now due to the runtime adding stubs to all operating systems the project officially supports, it is safer to be explicit when dealing with syscall definitions since there is no guarantee that they will exist for newly-added operating systems. Stated more plainly, this change means dcrd will now be shutdown cleanly on more variants of unix as well as when being terminated by windows itself due to various things such as the user logging off, the window terminal being closed, and the system shutting down.
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Go 1.14 added runtime support for handling the windows
CTRL_CLOSE_EVENT,CTRL_LOGOFF_EVENT, andCTRL_SHUTDOWN_EVENTevents by adding a definition forsyscall.SIGTERMto windows and converting the events to that signal. It also added definitions for other common signals, includingSIGHUP, and treats them as NOOPs on windows.Consequently, this modifies the logic that deals with conditionally handling
SIGTERMandSIGHUPto handle them for windows as well as all unix-like operating systems, including newer ones that are supported by Go since the code was originally written.Although the additional signals could probably just be added unconditionally without too much issue now due to the runtime adding stubs to all operating systems the project officially supports, it is safer to be explicit when dealing with
syscalldefinitions since there is no guarantee that they will exist for newly-added operating systems.Stated more plainly, this change means dcrd will now be shutdown cleanly on more variants of unix as well as when being terminated by windows itself due to various things such as the user logging off, the window terminal being closed, and the system shutting down.