Fix typos in comments for ALTER SYSTEM.

Michael Paquier

src/backend/utils/misc/guc-file.l

@@ -149,7 +149,7 @@ ProcessConfigFile(GucContext context)
 	}
 
 	/*
-	 * Parse postgresql.auto.conf file after postgresql.conf to replace
+	 * Parse file PG_AUTOCONF_FILENAME after postgresql.conf to replace
 	 * parameters set by ALTER SYSTEM command. This file is present in
 	 * data directory, however when called during initdb data directory is not
 	 * set till this point, so use ConfigFile path which will be same.

src/backend/utils/misc/guc.c

@@ -6457,9 +6457,9 @@ flatten_set_variable_args(const char *name, List *args)
 }
 
 /*
- * Writes updated configuration parameter values into
+ * Write updated configuration parameter values into a temporary file.
- * postgresql.auto.conf.temp file. It traverses the list of parameters
+ * This function traverses the list of parameters and quotes the string
- * and quote the string values before writing them to temporaray file.
+ * values before writing them.
  */
 static void
 write_auto_conf_file(int fd, const char *filename, ConfigVariable **head_p)
@@ -6517,7 +6517,7 @@ write_auto_conf_file(int fd, const char *filename, ConfigVariable **head_p)
 
 /*
  * This function takes list of all configuration parameters in
- * postgresql.auto.conf and parameter to be updated as input arguments and
+ * PG_AUTOCONF_FILENAME and parameter to be updated as input arguments and
  * replace the updated configuration parameter value in a list. If the
  * parameter to be updated is new then it is appended to the list of
  * parameters.
@@ -6595,13 +6595,12 @@ replace_auto_config_value(ConfigVariable **head_p, ConfigVariable **tail_p,
  * and write them all to the automatic configuration file.
  *
  * The configuration parameters are written to a temporary
- * file then renamed to the final name. The template for the
+ * file then renamed to the final name.
- * temporary file is postgresql.auto.conf.temp.
  *
  * An LWLock is used to serialize writing to the same file.
  *
  * In case of an error, we leave the original automatic
- * configuration file (postgresql.auto.conf) intact.
+ * configuration file (PG_AUTOCONF_FILENAME) intact.
  */
 void
 AlterSystemSetConfigFile(AlterSystemStmt * altersysstmt)
@@ -6664,8 +6663,8 @@ AlterSystemSetConfigFile(AlterSystemStmt * altersysstmt)
 
 
 	/*
-	 * Use data directory as reference path for postgresql.auto.conf and it's
+	 * Use data directory as reference path for PG_AUTOCONF_FILENAME and its
-	 * corresponding temp file
+	 * corresponding temporary file.
 	 */
 	join_path_components(AutoConfFileName, data_directory, PG_AUTOCONF_FILENAME);
 	canonicalize_path(AutoConfFileName);
@@ -6674,10 +6673,10 @@ AlterSystemSetConfigFile(AlterSystemStmt * altersysstmt)
 			 "temp");
 
 	/*
-	 * one backend is allowed to operate on postgresql.auto.conf file, to
+	 * One backend is allowed to operate on file PG_AUTOCONF_FILENAME, to
 	 * ensure that we need to update the contents of the file with
 	 * AutoFileLock. To ensure crash safety, first the contents are written to
-	 * temporary file and then rename it to postgresql.auto.conf. In case
+	 * a temporary file which is then renameed to PG_AUTOCONF_FILENAME. In case
 	 * there exists a temp file from previous crash, that can be reused.
 	 */
 
@@ -6694,14 +6693,14 @@ AlterSystemSetConfigFile(AlterSystemStmt * altersysstmt)
 	{
 		if (stat(AutoConfFileName, &st) == 0)
 		{
-			/* open postgresql.auto.conf file */
+			/* open file PG_AUTOCONF_FILENAME */
 			infile = AllocateFile(AutoConfFileName, "r");
 			if (infile == NULL)
 				ereport(ERROR,
 						(errmsg("failed to open auto conf file \"%s\": %m ",
 								AutoConfFileName)));
 
-			/* Parse the postgresql.auto.conf file */
+			/* parse it */
 			ParseConfigFp(infile, AutoConfFileName, 0, LOG, &head, &tail);
 
 			FreeFile(infile);
@@ -6713,7 +6712,7 @@ AlterSystemSetConfigFile(AlterSystemStmt * altersysstmt)
 		 */
 		replace_auto_config_value(&head, &tail, AutoConfFileName, name, value);
 
-		/* Write and sync the New contents to postgresql.auto.conf.temp file */
+		/* Write and sync the new contents to the temporary file */
 		write_auto_conf_file(Tmpfd, AutoConfTmpFileName, &head);
 
 		close(Tmpfd);

src/include/pg_config_manual.h

@@ -304,6 +304,6 @@
 /*
  * Automatic configuration file name for ALTER SYSTEM.
  * This file will be used to store values of configuration parameters
- * set by ALTER SYSTEM command
+ * set by ALTER SYSTEM command.
  */
 #define PG_AUTOCONF_FILENAME		"postgresql.auto.conf"