Unify error messages

... for translatability purposes.

src/backend/storage/ipc/latch.c

@@ -856,7 +856,9 @@ WaitEventAdjustEpoll(WaitEventSet *set, WaitEvent *event, int action)
 	if (rc < 0)
 		ereport(ERROR,
 				(errcode_for_socket_access(),
-				 errmsg("epoll_ctl() failed: %m")));
+				 /* translator: %s is a syscall name, such as "poll()" */
+				 errmsg("%s failed: %m",
+						"epoll_ctl()")));
 }
 #endif
 
@@ -1087,7 +1089,9 @@ WaitEventSetWaitBlock(WaitEventSet *set, int cur_timeout,
 			waiting = false;
 			ereport(ERROR,
 					(errcode_for_socket_access(),
-					 errmsg("epoll_wait() failed: %m")));
+					 /* translator: %s is a syscall name, such as "poll()" */
+					 errmsg("%s failed: %m",
+							"epoll_wait()")));
 		}
 		return 0;
 	}
@@ -1211,7 +1215,9 @@ WaitEventSetWaitBlock(WaitEventSet *set, int cur_timeout,
 			waiting = false;
 			ereport(ERROR,
 					(errcode_for_socket_access(),
-					 errmsg("poll() failed: %m")));
+					 /* translator: %s is a syscall name, such as "poll()" */
+					 errmsg("%s failed: %m",
+							"poll()")));
 		}
 		return 0;
 	}

src/backend/storage/ipc/signalfuncs.c

@@ -181,7 +181,9 @@ pg_rotate_logfile(PG_FUNCTION_ARGS)
 		ereport(ERROR,
 				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
 				 (errmsg("must be superuser to rotate log files with adminpack 1.0"),
-				  errhint("Consider using pg_logfile_rotate(), which is part of core, instead."))));
+				  /* translator: %s is a SQL function name */
+				  errhint("Consider using %s, which is part of core, instead.",
+						  "pg_logfile_rotate()"))));
 
 	if (!Logging_collector)
 	{

src/backend/utils/adt/formatting.c

@@ -1566,7 +1566,8 @@ str_tolower(const char *buff, size_t nbytes, Oid collid)
 				 */
 				ereport(ERROR,
 						(errcode(ERRCODE_INDETERMINATE_COLLATION),
-						 errmsg("could not determine which collation to use for lower() function"),
+						 errmsg("could not determine which collation to use for %s function",
+								"lower()"),
 						 errhint("Use the COLLATE clause to set the collation explicitly.")));
 			}
 			mylocale = pg_newlocale_from_collation(collid);
@@ -1688,7 +1689,8 @@ str_toupper(const char *buff, size_t nbytes, Oid collid)
 				 */
 				ereport(ERROR,
 						(errcode(ERRCODE_INDETERMINATE_COLLATION),
-						 errmsg("could not determine which collation to use for upper() function"),
+						 errmsg("could not determine which collation to use for %s function",
+								"upper()"),
 						 errhint("Use the COLLATE clause to set the collation explicitly.")));
 			}
 			mylocale = pg_newlocale_from_collation(collid);
@@ -1811,7 +1813,8 @@ str_initcap(const char *buff, size_t nbytes, Oid collid)
 				 */
 				ereport(ERROR,
 						(errcode(ERRCODE_INDETERMINATE_COLLATION),
-						 errmsg("could not determine which collation to use for initcap() function"),
+						 errmsg("could not determine which collation to use for %s function",
+								"initcap()"),
 						 errhint("Use the COLLATE clause to set the collation explicitly.")));
 			}
 			mylocale = pg_newlocale_from_collation(collid);

src/backend/utils/adt/genfile.c

@@ -219,7 +219,9 @@ pg_read_file(PG_FUNCTION_ARGS)
 		ereport(ERROR,
 				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
 				 (errmsg("must be superuser to read files with adminpack 1.0"),
-				  errhint("Consider using pg_file_read(), which is part of core, instead."))));
+				  /* translator: %s is a SQL function name */
+				  errhint("Consider using %s, which is part of core, instead.",
+						  "pg_file_read()"))));
 
 	/* handle optional arguments */
 	if (PG_NARGS() >= 3)

src/backend/utils/adt/json.c

@@ -2192,7 +2192,9 @@ json_build_object(PG_FUNCTION_ARGS)
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 				 errmsg("argument list must have even number of elements"),
-				 errhint("The arguments of json_build_object() must consist of alternating keys and values.")));
+				 /* translator: %s is a SQL function name */
+				 errhint("The arguments of %s must consist of alternating keys and values.",
+						 "json_build_object()")));
 
 	result = makeStringInfo();
 

src/backend/utils/adt/jsonb.c

@@ -1155,7 +1155,9 @@ jsonb_build_object(PG_FUNCTION_ARGS)
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 				 errmsg("argument list must have even number of elements"),
-				 errhint("The arguments of jsonb_build_object() must consist of alternating keys and values.")));
+				 /* translator: %s is a SQL function name */
+				 errhint("The arguments of %s must consist of alternating keys and values.",
+						 "jsonb_build_object()")));
 
 	memset(&result, 0, sizeof(JsonbInState));