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Fix bug where pg_receivexlog goes into busy loop if -s option is set to 0.

The problem is that pg_receivexlog calls select(2) with timeout=0 andgoes into busy loop when --status-interval option is set to 0. This bugwas introduced by the commit,74cbe96.Per report from Sawada Masahiko

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src/bin/pg_basebackup
- receivelog.c

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`‎src/bin/pg_basebackup/receivelog.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1094,7 +1094,7 @@ CopyStreamReceive(PGconn conn, long timeout, char *buffer)`
`1094`	`1094`	`* No data available. Wait for some to appear, but not longer than`
`1095`	`1095`	`* the specified timeout, so that we can ping the server.`
`1096`	`1096`	`*/`
`1097`		`-if (timeout>0)`
	`1097`	`+if (timeout!=0)`
`1098`	`1098`	`{`
`1099`	`1099`	`intret;`
`1100`	`1100`

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Commit78493b7

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`‎src/bin/pg_basebackup/receivelog.c`

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