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Ensure _dosmaperr() actually sets errno correctly.

If logging is enabled, either ereport() or fprintf() might stomp on errnointernally, causing this function to return the wrong result. That mightonly end in a misleading error report, but in any code that's examiningerrno to decide what to do next, the consequences could be far graver.This has been broken since the very first version of this file in 2006... it's a bit astonishing that we didn't identify this long ago.Reported by Amit Kapila, though this isn't his proposed fix.

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src/port
- win32error.c

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`‎src/port/win32error.c`

Lines changed: 5 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -179,14 +179,16 @@ _dosmaperr(unsigned long e)`
`179`	`179`	`{`
`180`	`180`	`if (doserrors[i].winerr==e)`
`181`	`181`	`{`
`182`		`-errno=doserrors[i].doserr;`
	`182`	`+intdoserr=doserrors[i].doserr;`
	`183`	`+`
`183`	`184`	`#ifndefFRONTEND`
`184`	`185`	`ereport(DEBUG5,`
`185`	`186`	`(errmsg_internal("mapped win32 error code %lu to %d",`
`186`		`-e,errno)));`
	`187`	`+e,doserr)));`
`187`	`188`	`#elifFRONTEND_DEBUG`
`188`		`-fprintf(stderr,_("mapped win32 error code %lu to %d"),e,errno);`
	`189`	`+fprintf(stderr,_("mapped win32 error code %lu to %d"),e,doserr);`
`189`	`190`	`#endif`
	`191`	`+errno=doserr;`
`190`	`192`	`return;`
`191`	`193`	`}`
`192`	`194`	`}`

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Commitf145454

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`‎src/port/win32error.c`

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