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Old 01-13-2019, 05:15 AM   #1
LXer
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LXer: Non-Child Process Exit Notification Support


Published at LXer:

Daniel Colascione submitted some code to support processes knowing whenothers have terminated. Normally a process can tell when its own childprocesses have ended, but not unrelated processes, or at least nottrivially. Daniel's patch created a new file in the /proc directory entryfor each process—a file called "exithand" that is readable by any otherprocess. If the target process is still running, attempts toread() itsexithand file will simply block, forcing the querying process to wait.When the target process ends, the read() operation will complete, and thequerying process will thereby know that the target process has ended.

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