Prevent file descriptor leak from failed COPY.

Author: bmomjian

src/backend/commands/copy.c

@@ -6,7 +6,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/commands/copy.c,v 1.56 1998/08/29 05:27:15 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/commands/copy.c,v 1.57 1998/08/29 18:19:59 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -108,12 +108,21 @@ DoCopy(char *relname, bool binary, bool oids, bool from, bool pipe,
   the class.
 ----------------------------------------------------------------------------*/
 
-	FILE	   *fp;
+	static FILE	   *fp;						/* static for cleanup */
+	static bool		file_opened = false;	/* static for cleanup */
 	Relation	rel;
 	extern char *UserName;		/* defined in global.c */
 	const AclMode required_access = from ? ACL_WR : ACL_RD;
 	int			result;
 
+	/*
+	 *	Close previous file opened for COPY but failed with elog().
+	 *	There should be a better way, but would not be modular.
+	 *	Prevents file descriptor leak.  bjm 1998/08/29
+	 */
+	if (file_opened)
+		FreeFile(fp);
+
 	rel = heap_openr(relname);
 	if (rel == NULL)
 		elog(ERROR, "COPY command failed.  Class %s "
@@ -146,14 +155,13 @@ DoCopy(char *relname, bool binary, bool oids, bool from, bool pipe,
 			}
 			else
 			{
-				/* if we elog() out, the file stays open */
 				fp = AllocateFile(filename, "r");
 				if (fp == NULL)
 					elog(ERROR, "COPY command, running in backend with "
 						 "effective uid %d, could not open file '%s' for "
 						 "reading.  Errno = %s (%d).",
 						 geteuid(), filename, strerror(errno), errno);
-				/* Above should not return */
+				file_opened = true;
 			}
 			CopyFrom(rel, binary, oids, fp, delim);
 		}
@@ -174,20 +182,22 @@ DoCopy(char *relname, bool binary, bool oids, bool from, bool pipe,
 				mode_t		oumask;		/* Pre-existing umask value */
 
 				oumask = umask((mode_t) 0);
-				/* if we elog() out, the file stays open */
 				fp = AllocateFile(filename, "w");
 				umask(oumask);
 				if (fp == NULL)
 					elog(ERROR, "COPY command, running in backend with "
 						 "effective uid %d, could not open file '%s' for "
 						 "writing.  Errno = %s (%d).",
 						 geteuid(), filename, strerror(errno), errno);
-				/* Above should not return */
+				file_opened = true;
 			}
 			CopyTo(rel, binary, oids, fp, delim);
 		}
 		if (!pipe)
+		{
 			FreeFile(fp);
+			file_opened = false;
+		}
 		else if (!from && !binary)
 		{
 			fputs("\\.\n", fp);