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Explain postmaster's treatment of SIGURG.

Add a few words of comment to explain why SIGURG doesn't follow thedummy_handler pattern used for SIGUSR2, since that might otherwiseappear to be a bug.Discussion:https://postgr.es/m/4006115.1618577212%40sss.pgh.pa.us

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src/backend/postmaster
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`‎src/backend/postmaster/postmaster.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -660,6 +660,11 @@ PostmasterMain(int argc, char *argv[])`
`660`	`660`	`pqsignal_pm(SIGCHLD,reaper);/* handle child termination */`
`661`	`661`
`662`	`662`	`#ifdefSIGURG`
	`663`	`+/*`
	`664`	`+ * Ignore SIGURG for now. Child processes may change this (see`
	`665`	`+ * InitializeLatchSupport), but they will not receive any such signals`
	`666`	`+ * until they wait on a latch.`
	`667`	`+ */`
`663`	`668`	`pqsignal_pm(SIGURG,SIG_IGN);/* ignored */`
`664`	`669`	`#endif`
`665`	`670`

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Commit8e861ea

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`‎src/backend/postmaster/postmaster.c‎`

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