Gabriele Svelto 613094b937 Bug 1620998 - Out-of-process crash generation for child processes r=afranchuk,geckoview-reviewers,glandium,browser-installer-reviewers,nalexander,owlish ... This implements the crash helper service used to move child process crash report generation out of the main process and into its own process. This is implemented as a separate executable that is launched on startup by the main process on the desktop platforms and as a service hosted by a separate process on Android. The crash helper process is started when the first exception handler is set on desktop platforms and before loading libxul on Android. In both cases starting this process happens asynchronously so that neither the main process nor child processes have to wait for it to come up. If a crash happens before the crash helper has started, the crashed process will wait for it to fully come up and then proceed with regular crash generation. IPC with the crash helper is implemented using Unix sockets on Linux and macOS with the former using sequential packets and the latter using stream sockets. On Windows we use named pipes. In all cases the choice of IPC was dictated both by the requirement to eventually talk directly to child processes from within the sandbox, and to external processes in case of Windows as the Windows Error Reporting exception handler must be able to reach out to the helper from within a restricted context. These particular requirements are not used yet but will be as we move more logic out of the main process logic. Differential Revision: https://phabricator.services.mozilla.com/D231083		2025-04-18 16:37:06 +00:00
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Contents	Bug 1620998 - Out-of-process crash generation for child processes r=afranchuk,geckoview-reviewers,glandium,browser-installer-reviewers,nalexander,owlish	2025-04-18 16:37:06 +00:00