Commit9375157

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Add CHECK_FOR_INTERRUPTS() to the wait_pid() loop.

Though the one contemporary caller uses it in a limited way, thisfunction could loop indefinitely if pointed to an arbitrary PID.

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Original file line number	Diff line number	Diff line change
`@@ -870,7 +870,10 @@ wait_pid(PG_FUNCTION_ARGS)`
`870`	`870`	`elog(ERROR,"must be superuser to check PID liveness");`
`871`	`871`
`872`	`872`	`while (kill(pid,0)==0)`
	`873`	`+{`
	`874`	`+CHECK_FOR_INTERRUPTS();`
`873`	`875`	`pg_usleep(50000);`
	`876`	`+}`
`874`	`877`
`875`	`878`	`if (errno!=ESRCH)`
`876`	`879`	`elog(ERROR,"could not check PID %d liveness: %m",pid);`

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