Ensure that close() and fclose() are checked for errors, at least in

cases involving writes.  Per recent discussion about the possibility
of close-time failures on some filesystems.  There is a TODO item for
this, too.

src/backend/access/transam/slru.c

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/access/transam/slru.c,v 1.8 2003/11/29 19:51:40 pgsql Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/slru.c,v 1.9 2004/01/26 22:35:31 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -144,7 +144,8 @@ typedef enum
 	SLRU_CREATE_FAILED,
 	SLRU_SEEK_FAILED,
 	SLRU_READ_FAILED,
-	SLRU_WRITE_FAILED
+	SLRU_WRITE_FAILED,
+	SLRU_CLOSE_FAILED
 } SlruErrorCause;
 static SlruErrorCause slru_errcause;
 static int	slru_errno;
@@ -510,7 +511,13 @@ SlruPhysicalReadPage(SlruCtl ctl, int pageno, int slotno)
 		return false;
 	}
 
-	close(fd);
+	if (close(fd))
+	{
+		slru_errcause = SLRU_CLOSE_FAILED;
+		slru_errno = errno;
+		return false;
+	}
+
 	return true;
 }
 
@@ -587,7 +594,13 @@ SlruPhysicalWritePage(SlruCtl ctl, int pageno, int slotno)
 		return false;
 	}
 
-	close(fd);
+	if (close(fd))
+	{
+		slru_errcause = SLRU_CLOSE_FAILED;
+		slru_errno = errno;
+		return false;
+	}
+
 	return true;
 }
 
@@ -642,6 +655,13 @@ SlruReportIOError(SlruCtl ctl, int pageno, TransactionId xid)
 				  errdetail("could not write to file \"%s\" at offset %u: %m",
 							path, offset)));
 			break;
+		case SLRU_CLOSE_FAILED:
+			ereport(ERROR,
+					(errcode_for_file_access(),
+				errmsg("could not access status of transaction %u", xid),
+				  errdetail("could not close file \"%s\": %m",
+							path)));
+			break;
 		default:
 			/* can't get here, we trust */
 			elog(ERROR, "unrecognized SimpleLru error cause: %d",

src/backend/access/transam/xlog.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.132 2004/01/19 19:04:40 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.133 2004/01/26 22:35:31 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1044,7 +1044,7 @@ XLogWrite(XLogwrtRqst WriteRqst)
 			 */
 			if (openLogFile >= 0)
 			{
-				if (close(openLogFile) != 0)
+				if (close(openLogFile))
 					ereport(PANIC,
 							(errcode_for_file_access(),
 					errmsg("could not close log file %u, segment %u: %m",
@@ -1162,7 +1162,7 @@ XLogWrite(XLogwrtRqst WriteRqst)
 			if (openLogFile >= 0 &&
 			 !XLByteInPrevSeg(LogwrtResult.Write, openLogId, openLogSeg))
 			{
-				if (close(openLogFile) != 0)
+				if (close(openLogFile))
 					ereport(PANIC,
 							(errcode_for_file_access(),
 					errmsg("could not close log file %u, segment %u: %m",
@@ -1427,7 +1427,10 @@ XLogFileInit(uint32 log, uint32 seg,
 				(errcode_for_file_access(),
 				 errmsg("could not fsync file \"%s\": %m", tmppath)));
 
-	close(fd);
+	if (close(fd))
+		ereport(PANIC,
+				(errcode_for_file_access(),
+				 errmsg("could not close file \"%s\": %m", tmppath)));
 
 	/*
 	 * Now move the segment into place with its final name.
@@ -2205,7 +2208,10 @@ WriteControlFile(void)
 				(errcode_for_file_access(),
 				 errmsg("could not fsync control file: %m")));
 
-	close(fd);
+	if (close(fd))
+		ereport(PANIC,
+				(errcode_for_file_access(),
+				 errmsg("could not close control file: %m")));
 }
 
 static void
@@ -2382,7 +2388,10 @@ UpdateControlFile(void)
 				(errcode_for_file_access(),
 				 errmsg("could not fsync control file: %m")));
 
-	close(fd);
+	if (close(fd))
+		ereport(PANIC,
+				(errcode_for_file_access(),
+				 errmsg("could not close control file: %m")));
 }
 
 /*
@@ -2535,7 +2544,11 @@ BootStrapXLOG(void)
 				(errcode_for_file_access(),
 				 errmsg("could not fsync bootstrap transaction log file: %m")));
 
-	close(openLogFile);
+	if (close(openLogFile))
+		ereport(PANIC,
+				(errcode_for_file_access(),
+				 errmsg("could not close bootstrap transaction log file: %m")));
+
 	openLogFile = -1;
 
 	memset(ControlFile, 0, sizeof(ControlFileData));
@@ -3577,7 +3590,7 @@ assign_xlog_sync_method(const char *method, bool doit, GucSource source)
 						   openLogId, openLogSeg)));
 			if (open_sync_bit != new_sync_bit)
 			{
-				if (close(openLogFile) != 0)
+				if (close(openLogFile))
 					ereport(PANIC,
 							(errcode_for_file_access(),
 					errmsg("could not close log file %u, segment %u: %m",

src/backend/commands/copy.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.215 2004/01/18 02:15:29 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.216 2004/01/26 22:35:31 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -921,7 +921,14 @@ DoCopy(const CopyStmt *stmt)
 	}
 
 	if (!pipe)
-		FreeFile(copy_file);
+	{
+		/* we assume only the write case could fail here */
+		if (FreeFile(copy_file))
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not write to file \"%s\": %m",
+							filename)));
+	}
 	else if (IsUnderPostmaster && !is_from)
 		SendCopyEnd(binary);
 	pfree(attribute_buf.data);

src/backend/commands/user.c

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/commands/user.c,v 1.132 2004/01/07 18:56:25 neilc Exp $
+ * $PostgreSQL: pgsql/src/backend/commands/user.c,v 1.133 2004/01/26 22:35:32 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -241,12 +241,11 @@ write_group_file(Relation grel)
 	}
 	heap_endscan(scan);
 
-	fflush(fp);
-	if (ferror(fp))
+	if (FreeFile(fp))
 		ereport(ERROR,
 				(errcode_for_file_access(),
-			  errmsg("could not write to temporary file \"%s\": %m", tempname)));
-	FreeFile(fp);
+				 errmsg("could not write to temporary file \"%s\": %m",
+						tempname)));
 
 	/*
 	 * Rename the temp file to its final name, deleting the old pg_pwd. We
@@ -372,12 +371,11 @@ write_user_file(Relation urel)
 	}
 	heap_endscan(scan);
 
-	fflush(fp);
-	if (ferror(fp))
+	if (FreeFile(fp))
 		ereport(ERROR,
 				(errcode_for_file_access(),
-			  errmsg("could not write to temporary file \"%s\": %m", tempname)));
-	FreeFile(fp);
+				 errmsg("could not write to temporary file \"%s\": %m",
+						tempname)));
 
 	/*
 	 * Rename the temp file to its final name, deleting the old pg_pwd. We

src/backend/postmaster/postmaster.c

@@ -37,7 +37,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.358 2004/01/11 03:49:31 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.359 2004/01/26 22:35:32 tgl Exp $
  *
  * NOTES
  *
@@ -3171,15 +3171,12 @@ CreateOptsFile(int argc, char *argv[])
 		fprintf(fp, " '%s'", argv[i]);
 	fputs("\n", fp);
 
-	fflush(fp);
-	if (ferror(fp))
+	if (fclose(fp))
 	{
 		elog(LOG, "could not write file \"%s\": %m", filename);
-		fclose(fp);
 		return false;
 	}
 
-	fclose(fp);
 	return true;
 }
 
@@ -3290,7 +3287,14 @@ write_backend_variables(Port *port)
 	write_var(debug_flag,fp);
 
 	/* Release file */
-	FreeFile(fp);
+	if (FreeFile(fp))
+	{
+		ereport(ERROR,
+				(errcode_for_file_access(),
+				 errmsg("could not write to file \"%s\": %m", filename)));
+		return false;
+	}
+
 	return true;
 }
 

src/backend/storage/file/fd.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.105 2003/12/20 17:31:21 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.106 2004/01/26 22:35:32 tgl Exp $
  *
  * NOTES:
  *
@@ -397,7 +397,7 @@ LruDelete(File file)
 
 	/* close the file */
 	if (close(vfdP->fd))
-		elog(LOG, "failed to close \"%s\": %m",
+		elog(ERROR, "failed to close \"%s\": %m",
 			 vfdP->fileName);
 
 	--nfile;
@@ -842,7 +842,7 @@ FileClose(File file)
 
 		/* close the file */
 		if (close(vfdP->fd))
-			elog(LOG, "failed to close \"%s\": %m",
+			elog(ERROR, "failed to close \"%s\": %m",
 				 vfdP->fileName);
 
 		--nfile;
@@ -1069,7 +1069,13 @@ TryAgain:
 	return NULL;
 }
 
-void
+/*
+ * Close a file returned by AllocateFile.
+ *
+ * Note we do not check fclose's return value --- it is up to the caller
+ * to handle close errors.
+ */
+int
 FreeFile(FILE *file)
 {
 	int			i;
@@ -1089,7 +1095,7 @@ FreeFile(FILE *file)
 	if (i < 0)
 		elog(WARNING, "file passed to FreeFile was not obtained from AllocateFile");
 
-	fclose(file);
+	return fclose(file);
 }
 
 /*

src/backend/storage/freespace/freespace.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.29 2004/01/11 03:49:31 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.30 2004/01/26 22:35:32 tgl Exp $
  *
  *
  * NOTES:
@@ -793,7 +793,12 @@ DumpFreeSpaceMap(int code, Datum arg)
 	/* Clean up */
 	LWLockRelease(FreeSpaceLock);
 
-	FreeFile(fp);
+	if (FreeFile(fp))
+	{
+		elog(LOG, "could not write \"%s\": %m", cachefilename);
+		/* Remove busted cache file */
+		unlink(cachefilename);
+	}
 
 	return;
 

src/backend/utils/cache/relcache.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.194 2003/12/28 21:57:37 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.195 2004/01/26 22:35:32 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -3330,7 +3330,8 @@ write_relcache_init_file(void)
 		MemoryContextSwitchTo(oldcxt);
 	}
 
-	FreeFile(fp);
+	if (FreeFile(fp))
+		elog(FATAL, "could not write init file");
 
 	/*
 	 * Now we have to check whether the data we've so painstakingly

src/backend/utils/init/miscinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.119 2004/01/08 06:01:21 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/init/miscinit.c,v 1.120 2004/01/26 22:35:32 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -622,7 +622,16 @@ CreateLockFile(const char *filename, bool amPostmaster,
 				(errcode_for_file_access(),
 			  errmsg("could not write lock file \"%s\": %m", filename)));
 	}
-	close(fd);
+	if (close(fd))
+	{
+		int			save_errno = errno;
+
+		unlink(filename);
+		errno = save_errno;
+		ereport(FATAL,
+				(errcode_for_file_access(),
+			  errmsg("could not write lock file \"%s\": %m", filename)));
+	}
 
 	/*
 	 * Arrange for automatic removal of lockfile at proc_exit.
@@ -776,7 +785,13 @@ RecordSharedMemoryInLockFile(unsigned long id1, unsigned long id2)
 		close(fd);
 		return;
 	}
-	close(fd);
+	if (close(fd))
+	{
+		ereport(LOG,
+				(errcode_for_file_access(),
+				 errmsg("could not write to file \"%s\": %m",
+						directoryLockFile)));
+	}
 }
 
 

src/backend/utils/misc/guc.c

@@ -10,7 +10,7 @@
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.180 2004/01/24 20:00:45 wieck Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.181 2004/01/26 22:35:32 tgl Exp $
  *
  *--------------------------------------------------------------------
  */
@@ -3971,7 +3971,16 @@ write_nondefault_variables(GucContext context)
 		}
 	}
 
-	FreeFile(fp);
+	if (FreeFile(fp))
+	{
+		free(new_filename);
+		free(filename);
+		ereport(elevel,
+				(errcode_for_file_access(),
+				 errmsg("could not write to file \"%s\": %m", CONFIG_EXEC_PARAMS)));
+		return;
+	}
+
 	/* Put new file in place, this could delay on Win32 */
 	rename(new_filename, filename);
 	free(new_filename);