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Fix unsafe usage of strerror(errno) within ereport().

This is the converse of the unsafe-usage-of-%m problem: the reasonereport/elog provide that format code is mainly to dodge the hazardof errno getting changed before control reaches functions within thearguments of the macro. I only found one instance of this hazard,but it's been there since 9.4 :-(.

1 parent9c515f7 commit1545ca9Copy full SHA for 1545ca9

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src/backend/libpq
- auth.c

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`‎src/backend/libpq/auth.c`

Lines changed: 3 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1752,10 +1752,12 @@ auth_peer(hbaPort *port)`
`1752`	`1752`	`pw=getpwuid(uid);`
`1753`	`1753`	`if (!pw)`
`1754`	`1754`	`{`
	`1755`	`+intsave_errno=errno;`
	`1756`	`+`
`1755`	`1757`	`ereport(LOG,`
`1756`	`1758`	`(errmsg("could not look up local user ID %ld: %s",`
`1757`	`1759`	`(long)uid,`
`1758`		`-errno ?strerror(errno) :_("user does not exist"))));`
	`1760`	`+save_errno ?strerror(save_errno) :_("user does not exist"))));`
`1759`	`1761`	`returnSTATUS_ERROR;`
`1760`	`1762`	`}`
`1761`	`1763`

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Commit1545ca9

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`‎src/backend/libpq/auth.c`

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