Don't pass an invalid file handle to dup2(). That causes a crash on

Windows, thanks to a feature in CRT called Parameter Validation.

Backpatch to 8.2, which is the oldest version supported on Windows. In
8.2 and 8.3 also backpatch the earlier change to use DEVNULL instead of
NULL_DEV #define for a /dev/null-like device. NULL_DEV was hard-coded to
"/dev/null" regardless of platform, which didn't work on Windows, while
DEVNULL works on all platforms. Restarting syslogger didn't work on
Windows on versions 8.3 and below because of that.

1 files changed, 7 insertions, 4 deletions

diff --git a/src/backend/postmaster/syslogger.c b/src/backend/postmaster/syslogger.c
index 5c9eaf4619..304dc574d8 100644
--- a/src/backend/postmaster/syslogger.c
+++ b/src/backend/postmaster/syslogger.c
@@ -18,7 +18,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/syslogger.c,v 1.55 2010/01/02 16:57:51 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/syslogger.c,v 1.56 2010/04/01 20:12:22 heikki Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -194,9 +194,12 @@ SysLoggerMain(int argc, char *argv[])
 		 */
 		close(fileno(stdout));
 		close(fileno(stderr));
-		dup2(fd, fileno(stdout));
-		dup2(fd, fileno(stderr));
-		close(fd);
+		if (fd != -1)
+		{
+			dup2(fd, fileno(stdout));
+			dup2(fd, fileno(stderr));
+			close(fd);
+		}
 	}
 
 	/*