Switch back to variadic log macros.HEADpumaster

This essentially reverts commit 66cdd5bc99a5 which aimed to make the
dss log facility C89 conform. While this was a worthwhile goal in
2012, it has little value today, since in 2025 we can safely assume
a C99 compliant compiler.

The patch was created with

	git revert -Xours 66cdd5bc

followed by manual tweaks to make it compile again.

10 files changed, 131 insertions, 194 deletions

diff --git a/daemon.c b/daemon.c
index f667870..8333ec3 100644
--- a/daemon.c
+++ b/daemon.c
@@ -27,7 +27,7 @@ int daemon_init(void)
 	pid_t pid;
 	int null, fd[2];
 
-	DSS_INFO_LOG(("daemonizing\n"));
+	DSS_INFO_LOG("daemonizing\n");
 	if (pipe(fd) < 0)
 		goto err;
 	pid = fork();
@@ -46,7 +46,7 @@ int daemon_init(void)
 		close(fd[1]);
 		ret = read(fd[0], &c, 1);
 		if (ret <= 0) {
-			DSS_EMERG_LOG(("child terminated unexpectedly\n"));
+			DSS_EMERG_LOG("child terminated unexpectedly\n");
 			exit(EXIT_FAILURE);
 		}
 		exit(EXIT_SUCCESS);
@@ -67,7 +67,7 @@ int daemon_init(void)
 	close(null);
 	return fd[1];
 err:
-	DSS_EMERG_LOG(("fatal: %s\n", strerror(errno)));
+	DSS_EMERG_LOG("fatal: %s\n", strerror(errno));
 	exit(EXIT_FAILURE);
 }
 
@@ -82,8 +82,8 @@ FILE *open_log(const char *logfile_name)
 	assert(logfile_name);
 	logfile = fopen(logfile_name, "a");
 	if (!logfile) {
-		DSS_EMERG_LOG(("can not open %s: %s\n", logfile_name,
-			strerror(errno)));
+		DSS_EMERG_LOG("can not open %s: %s\n", logfile_name,
+			strerror(errno));
 		exit(EXIT_FAILURE);
 	}
 	setlinebuf(logfile);
@@ -97,12 +97,12 @@ void close_log(FILE* logfile)
 {
 	if (!logfile)
 		return;
-	DSS_INFO_LOG(("closing logfile\n"));
+	DSS_INFO_LOG("closing logfile\n");
 	fclose(logfile);
 }
 
 void log_welcome(int loglevel)
 {
-	DSS_INFO_LOG(("***** welcome to dss ******\n"));
-	DSS_DEBUG_LOG(("using loglevel %d\n", loglevel));
+	DSS_INFO_LOG("***** welcome to dss ******\n");
+	DSS_DEBUG_LOG("using loglevel %d\n", loglevel);
 }
diff --git a/df.c b/df.c
index 7fb319e..5d7c880 100644
--- a/df.c
+++ b/df.c
@@ -38,7 +38,7 @@ int get_disk_space(const char *path, struct disk_space *result)
 
 void log_disk_space(struct disk_space *ds)
 {
-	DSS_INFO_LOG(("free: %uM/%uM (%u%%), %u%% inodes unused\n",
+	DSS_INFO_LOG("free: %uM/%uM (%u%%), %u%% inodes unused\n",
 		ds->free_mb, ds->total_mb, ds->percent_free,
-		ds->percent_free_inodes));
+		ds->percent_free_inodes);
 }
diff --git a/dss.c b/dss.c
index 253c234..c23cca7 100644
--- a/dss.c
+++ b/dss.c
@@ -143,12 +143,12 @@ static void dump_dss_config(const char *msg)
 	fprintf(log, "\n*** disk space ***\n\n");
 	ret = get_disk_space(".", &ds);
 	if (ret >= 0) {
-		DSS_INFO_LOG(("disk space low: %s\n", disk_space_low(&ds)?
-			"yes" : "no"));
+		DSS_INFO_LOG("disk space low: %s\n", disk_space_low(&ds)?
+			"yes" : "no");
 		log_disk_space(&ds);
 	} else
-		DSS_ERROR_LOG(("can not get free disk space: %s\n",
-			dss_strerror(-ret)));
+		DSS_ERROR_LOG("can not get free disk space: %s\n",
+			dss_strerror(-ret));
 
 	/* we continue on errors from get_disk_space */
 
@@ -212,21 +212,8 @@ static void dump_dss_config(const char *msg)
 	fprintf(log, "%s </%s config> %s\n", dash, msg, dash);
 }
 
-static int loglevel = -1;
-static const char *location_file = NULL;
-static int         location_line = -1;
-static const char *location_func = NULL;
-
-void dss_log_set_params(int ll, const char *file, int line, const char *func)
-{
-	loglevel = ll;
-	location_file = file;
-	location_line = line;
-	location_func = func;
-}
-
 /* All DSS_XXX_LOG() macros use this function. */
-__printf_1_2 void dss_log(const char* fmt,...)
+__printf_2_3 void dss_log(int ll, const char* fmt,...)
 {
 	va_list argp;
 	FILE *outfd;
@@ -235,7 +222,7 @@ __printf_1_2 void dss_log(const char* fmt,...)
 	char str[255] = "";
 	int lpr_ll = lpr? OPT_UINT32_VAL(DSS, LOGLEVEL) : WARNING;
 
-	if (loglevel < lpr_ll)
+	if (ll < lpr_ll)
 		return;
 	outfd = logfile? logfile : stderr;
 	if (subcmd == CMD_PTR(RUN)) {
@@ -244,14 +231,8 @@ __printf_1_2 void dss_log(const char* fmt,...)
 		strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
 		fprintf(outfd, "%s ", str);
 		if (lpr_ll <= INFO)
-			fprintf(outfd, "%i: ", loglevel);
+			fprintf(outfd, "%i: ", ll);
 	}
-	if (subcmd == CMD_PTR(RUN))
-#ifdef DSS_NO_FUNC_NAMES
-		fprintf(outfd, "%s:%d: ", location_file, location_line);
-#else
-		fprintf(outfd, "%s: ", location_func);
-#endif
 	va_start(argp, fmt);
 	vfprintf(outfd, fmt, argp);
 	va_end(argp);
@@ -274,8 +255,8 @@ static void set_config_file_name(void)
 		const char *arg = OPT_STRING_VAL(DSS, CONFIG_FILE);
 		config_file = realpath(arg, NULL);
 		if (!config_file) {
-			DSS_EMERG_LOG(("could not resolve path %s: %s\n", arg,
-				strerror(errno)));
+			DSS_EMERG_LOG("could not resolve path %s: %s\n", arg,
+				strerror(errno));
 			exit(EXIT_FAILURE);
 		}
 	} else {
@@ -288,7 +269,7 @@ static void set_config_file_name(void)
 		else /* not fatal */
 			config_file = arg;
 	}
-	DSS_DEBUG_LOG(("config file: %s\n", config_file));
+	DSS_DEBUG_LOG("config file: %s\n", config_file);
 	ipc_key = super_fast_hash((uint8_t *)config_file,
 		strlen(config_file), 0) >> 1;
 }
@@ -306,7 +287,7 @@ static int send_signal(int sig, bool wait)
 		dss_msg("%d\n", (int)pid);
 		return 0;
 	}
-	DSS_NOTICE_LOG(("sending signal %d to pid %d\n", sig, (int)pid));
+	DSS_NOTICE_LOG("sending signal %d to pid %d\n", sig, (int)pid);
 	ret = kill(pid, sig);
 	if (ret < 0)
 		return -ERRNO_TO_DSS_ERROR(errno);
@@ -407,7 +388,7 @@ static int com_kill(void)
 	for (i = 0; i < SIGNAL_TABLE_SIZE; i++)
 		if (strcasecmp(arg, signal_table[i].name) == 0)
 			return send_signal(signal_table[i].num, w_given);
-	DSS_ERROR_LOG(("invalid sigspec: %s\n", arg));
+	DSS_ERROR_LOG("invalid sigspec: %s\n", arg);
 	return -ERRNO_TO_DSS_ERROR(EINVAL);
 }
 EXPORT_CMD_HANDLER(kill);
@@ -469,11 +450,11 @@ static int next_snapshot_is_due(void)
 	if (!next_snapshot_time_is_valid())
 		next_snapshot_time = compute_next_snapshot_time();
 	if (next_snapshot_time <= now) {
-		DSS_DEBUG_LOG(("next snapshot: now\n"));
+		DSS_DEBUG_LOG("next snapshot: now\n");
 		return 1;
 	}
-	DSS_DEBUG_LOG(("next snapshot due in %" PRId64 " seconds\n",
-		next_snapshot_time - now));
+	DSS_DEBUG_LOG("next snapshot due in %" PRId64 " seconds\n",
+		next_snapshot_time - now);
 	return 0;
 }
 
@@ -482,7 +463,7 @@ static void pre_create_hook(void)
 	assert(snapshot_creation_status == HS_READY);
 	/* make sure that the next snapshot time will be recomputed */
 	invalidate_next_snapshot_time();
-	DSS_DEBUG_LOG(("executing %s\n", OPT_STRING_VAL(DSS, PRE_CREATE_HOOK)));
+	DSS_DEBUG_LOG("executing %s\n", OPT_STRING_VAL(DSS, PRE_CREATE_HOOK));
 	dss_exec_cmdline_pid(&create_pid, OPT_STRING_VAL(DSS, PRE_CREATE_HOOK));
 	snapshot_creation_status = HS_PRE_RUNNING;
 }
@@ -493,7 +474,7 @@ static void pre_remove_hook(struct snapshot *s, const char *why)
 
 	if (!s)
 		return;
-	DSS_DEBUG_LOG(("%s snapshot %s\n", why, s->name));
+	DSS_DEBUG_LOG("%s snapshot %s\n", why, s->name);
 	assert(snapshot_removal_status == HS_READY);
 	assert(remove_pid == 0);
 	assert(!snapshot_currently_being_removed);
@@ -504,7 +485,7 @@ static void pre_remove_hook(struct snapshot *s, const char *why)
 
 	cmd = make_message("%s %s/%s", OPT_STRING_VAL(DSS, PRE_REMOVE_HOOK),
 		OPT_STRING_VAL(DSS, DEST_DIR), s->name);
-	DSS_DEBUG_LOG(("executing %s\n", cmd));
+	DSS_DEBUG_LOG("executing %s\n", cmd);
 	dss_exec_cmdline_pid(&remove_pid, cmd);
 	free(cmd);
 	snapshot_removal_status = HS_PRE_RUNNING;
@@ -525,7 +506,7 @@ static int exec_rm(void)
 	assert(snapshot_removal_status == HS_PRE_SUCCESS);
 	assert(remove_pid == 0);
 
-	DSS_NOTICE_LOG(("removing %s (interval = %i)\n", s->name, s->interval));
+	DSS_NOTICE_LOG("removing %s (interval = %i)\n", s->name, s->interval);
 	ret = dss_rename(s->name, new_name);
 	if (ret < 0)
 		goto out;
@@ -546,7 +527,7 @@ static struct snapshot *find_orphaned_snapshot(struct snapshot_list *sl)
 	struct snapshot *s;
 	int i;
 
-	DSS_DEBUG_LOG(("looking for old incomplete snapshots\n"));
+	DSS_DEBUG_LOG("looking for old incomplete snapshots\n");
 	FOR_EACH_SNAPSHOT(s, i, sl) {
 		if (snapshot_is_being_created(s))
 			continue;
@@ -589,7 +570,7 @@ static struct snapshot *find_redundant_snapshot(struct snapshot_list *sl)
 	unsigned missing = 0;
 	uint32_t N = OPT_UINT32_VAL(DSS, NUM_INTERVALS);
 
-	DSS_DEBUG_LOG(("looking for intervals containing too many snapshots\n"));
+	DSS_DEBUG_LOG("looking for intervals containing too many snapshots\n");
 	for (interval = N - 1; interval >= 0; interval--) {
 		unsigned keep = desired_number_of_snapshots(interval, N);
 		unsigned num = sl->interval_count[interval];
@@ -640,8 +621,8 @@ static struct snapshot *find_outdated_snapshot(struct snapshot_list *sl)
 	int i;
 	struct snapshot *s;
 
-	DSS_DEBUG_LOG(("looking for snapshots belonging to intervals >= %d\n",
-		OPT_UINT32_VAL(DSS, NUM_INTERVALS)));
+	DSS_DEBUG_LOG("looking for snapshots belonging to intervals >= %d\n",
+		OPT_UINT32_VAL(DSS, NUM_INTERVALS));
 	FOR_EACH_SNAPSHOT(s, i, sl) {
 		if (snapshot_is_being_created(s))
 			continue;
@@ -659,7 +640,7 @@ static struct snapshot *find_oldest_removable_snapshot(struct snapshot_list *sl)
 	int i, num_complete;
 	struct snapshot *s, *ref = NULL;
 
-	DSS_DEBUG_LOG(("picking snapshot with earliest creation time\n"));
+	DSS_DEBUG_LOG("picking snapshot with earliest creation time\n");
 	num_complete = num_complete_snapshots(sl);
 	if (num_complete <= OPT_UINT32_VAL(DSS, MIN_COMPLETE))
 		return NULL;
@@ -673,7 +654,7 @@ static struct snapshot *find_oldest_removable_snapshot(struct snapshot_list *sl)
 		return s;
 	}
 	assert(ref);
-	DSS_WARNING_LOG(("removing reference snapshot %s\n", ref->name));
+	DSS_WARNING_LOG("removing reference snapshot %s\n", ref->name);
 	return ref;
 }
 
@@ -710,7 +691,7 @@ static struct snapshot *find_removable_snapshot(struct snapshot_list *sl,
 	}
 	if (!try_hard)
 		goto nope;
-	DSS_WARNING_LOG(("nothing obvious to remove\n"));
+	DSS_WARNING_LOG("nothing obvious to remove\n");
 	victim = find_oldest_removable_snapshot(sl);
 	if (victim) {
 		*reason = make_message("oldest");
@@ -741,8 +722,8 @@ static int rename_incomplete_snapshot(int64_t start)
 	old_name = incomplete_name(start);
 	ret = dss_rename(old_name, path_to_last_complete_snapshot);
 	if (ret >= 0)
-		DSS_NOTICE_LOG(("%s -> %s\n", old_name,
-			path_to_last_complete_snapshot));
+		DSS_NOTICE_LOG("%s -> %s\n", old_name,
+			path_to_last_complete_snapshot);
 	free(old_name);
 	return ret;
 }
@@ -781,7 +762,7 @@ static int try_to_free_disk_space(void)
 		return 1;
 	if (!low_disk_space)
 		return 0;
-	DSS_CRIT_LOG(("uhuhu: disk space low and nothing to remove\n"));
+	DSS_CRIT_LOG("uhuhu: disk space low and nothing to remove\n");
 	return -ERRNO_TO_DSS_ERROR(ENOSPC);
 }
 
@@ -790,7 +771,7 @@ static void post_create_hook(void)
 	char *cmd = make_message("%s %s/%s",
 		OPT_STRING_VAL(DSS, POST_CREATE_HOOK),
 		OPT_STRING_VAL(DSS, DEST_DIR), path_to_last_complete_snapshot);
-	DSS_NOTICE_LOG(("executing %s\n", cmd));
+	DSS_NOTICE_LOG("executing %s\n", cmd);
 	dss_exec_cmdline_pid(&create_pid, cmd);
 	free(cmd);
 	snapshot_creation_status = HS_POST_RUNNING;
@@ -805,7 +786,7 @@ static void post_remove_hook(void)
 
 	cmd = make_message("%s %s/%s", OPT_STRING_VAL(DSS, POST_REMOVE_HOOK),
 		OPT_STRING_VAL(DSS, DEST_DIR), s->name);
-	DSS_NOTICE_LOG(("executing %s\n", cmd));
+	DSS_NOTICE_LOG("executing %s\n", cmd);
 	dss_exec_cmdline_pid(&remove_pid, cmd);
 	free(cmd);
 	snapshot_removal_status = HS_POST_RUNNING;
@@ -831,13 +812,13 @@ static void dss_kill(pid_t pid, int sig, const char *msg)
 	else process_name = "??????";
 
 	if (msg)
-		DSS_INFO_LOG(("%s\n", msg));
-	DSS_DEBUG_LOG(("sending signal %d (%s) to pid %d (%s process)\n",
-		sig, signame, (int)pid, process_name));
+		DSS_INFO_LOG("%s\n", msg);
+	DSS_DEBUG_LOG("sending signal %d (%s) to pid %d (%s process)\n",
+		sig, signame, (int)pid, process_name);
 	if (kill(pid, sig) >= 0)
 		return;
-	DSS_INFO_LOG(("failed to send signal %d (%s) to pid %d (%s process)\n",
-		sig, signame, (int)pid, process_name));
+	DSS_INFO_LOG("failed to send signal %d (%s) to pid %d (%s process)\n",
+		sig, signame, (int)pid, process_name);
 }
 
 static void stop_create_process(void)
@@ -859,20 +840,20 @@ static void restart_create_process(void)
 static void log_termination_msg(pid_t pid, int status)
 {
 	if (WIFEXITED(status))
-		DSS_INFO_LOG(("child %i exited. Exit status: %i\n", (int)pid,
-			WEXITSTATUS(status)));
+		DSS_INFO_LOG("child %i exited. Exit status: %i\n", (int)pid,
+			WEXITSTATUS(status));
 	else if (WIFSIGNALED(status))
-		DSS_NOTICE_LOG(("child %i was killed by signal %i\n", (int)pid,
-			WTERMSIG(status)));
+		DSS_NOTICE_LOG("child %i was killed by signal %i\n", (int)pid,
+			WTERMSIG(status));
 	else
-		DSS_WARNING_LOG(("child %i terminated abormally\n", (int)pid));
+		DSS_WARNING_LOG("child %i terminated abormally\n", (int)pid);
 }
 
 static int wait_for_process(pid_t pid, int *status)
 {
 	int ret;
 
-	DSS_DEBUG_LOG(("Waiting for process %d to terminate\n", (int)pid));
+	DSS_DEBUG_LOG("Waiting for process %d to terminate\n", (int)pid);
 	for (;;) {
 		fd_set rfds;
 
@@ -897,7 +878,7 @@ static int wait_for_process(pid_t pid, int *status)
 		dss_kill(pid, SIGTERM, "killing child process");
 	}
 	if (ret < 0)
-		DSS_ERROR_LOG(("failed to wait for process %d\n", (int)pid));
+		DSS_ERROR_LOG("failed to wait for process %d\n", (int)pid);
 	else
 		log_termination_msg(pid, *status);
 	return ret;
@@ -984,7 +965,7 @@ static int handle_rsync_exit(int status)
 	int es, ret;
 
 	if (!WIFEXITED(status)) {
-		DSS_ERROR_LOG(("rsync process %d died involuntary\n", (int)create_pid));
+		DSS_ERROR_LOG("rsync process %d died involuntary\n", (int)create_pid);
 		ret = -E_INVOLUNTARY_EXIT;
 		snapshot_creation_status = HS_READY;
 		goto out;
@@ -995,8 +976,8 @@ static int handle_rsync_exit(int status)
 	 * 24: Partial transfer due to vanished source files
 	 */
 	if (es != 0 && es != 24) {
-		DSS_WARNING_LOG(("rsync exit code %d, error count %d\n",
-			es, ++num_consecutive_rsync_errors));
+		DSS_WARNING_LOG("rsync exit code %d, error count %d\n",
+			es, ++num_consecutive_rsync_errors);
 		if (!logfile) { /* called by com_run() */
 			ret = -E_BAD_EXIT_CODE;
 			goto out;
@@ -1007,7 +988,7 @@ static int handle_rsync_exit(int status)
 			snapshot_creation_status = HS_READY;
 			goto out;
 		}
-		DSS_WARNING_LOG(("restarting rsync process\n"));
+		DSS_WARNING_LOG("restarting rsync process\n");
 		snapshot_creation_status = HS_NEEDS_RESTART;
 		next_snapshot_time = get_current_time() + 60;
 		ret = 1;
@@ -1038,9 +1019,9 @@ static int handle_pre_create_hook_exit(int status)
 	es = WEXITSTATUS(status);
 	if (es) {
 		if (!warn_count--) {
-			DSS_NOTICE_LOG(("pre_create_hook %s returned %d\n",
-				OPT_STRING_VAL(DSS, PRE_CREATE_HOOK), es));
-			DSS_NOTICE_LOG(("deferring snapshot creation...\n"));
+			DSS_NOTICE_LOG("pre_create_hook %s returned %d\n",
+				OPT_STRING_VAL(DSS, PRE_CREATE_HOOK), es);
+			DSS_NOTICE_LOG("deferring snapshot creation...\n");
 			warn_count = 60; /* warn only once per hour */
 		}
 		next_snapshot_time = get_current_time() + 60;
@@ -1076,8 +1057,8 @@ static int handle_sigchld(void)
 			ret = 1;
 			break;
 		default:
-			DSS_EMERG_LOG(("BUG: create can't die in status %d\n",
-				snapshot_creation_status));
+			DSS_EMERG_LOG("BUG: create can't die in status %d\n",
+				snapshot_creation_status);
 			return -E_BUG;
 		}
 		create_pid = 0;
@@ -1089,7 +1070,7 @@ static int handle_sigchld(void)
 			return ret;
 		return ret;
 	}
-	DSS_EMERG_LOG(("BUG: unknown process %d died\n", (int)pid));
+	DSS_EMERG_LOG("BUG: unknown process %d died\n", (int)pid);
 	return -E_BUG;
 }
 
@@ -1100,26 +1081,26 @@ static int change_to_dest_dir(void)
 	const char *dd = OPT_STRING_VAL(DSS, DEST_DIR);
 	struct stat dot, dotdot;
 
-	DSS_INFO_LOG(("changing cwd to %s\n", dd));
+	DSS_INFO_LOG("changing cwd to %s\n", dd);
 	if (chdir(dd) < 0) {
 		ret = -ERRNO_TO_DSS_ERROR(errno);
-		DSS_ERROR_LOG(("could not change cwd to %s\n", dd));
+		DSS_ERROR_LOG("could not change cwd to %s\n", dd);
 		return ret;
 	}
 	if (!OPT_GIVEN(DSS, MOUNTPOINT))
 		return 0;
 	if (stat(".", &dot) < 0) {
 		ret = -ERRNO_TO_DSS_ERROR(errno);
-		DSS_ERROR_LOG(("could not stat .\n"));
+		DSS_ERROR_LOG("could not stat .\n");
 		return ret;
 	}
 	if (stat("..", &dotdot) < 0) {
 		ret = -ERRNO_TO_DSS_ERROR(errno);
-		DSS_ERROR_LOG(("could not stat ..\n"));
+		DSS_ERROR_LOG("could not stat ..\n");
 		return ret;
 	}
 	if (dot.st_dev == dotdot.st_dev && dot.st_ino != dotdot.st_ino) {
-		DSS_ERROR_LOG(("mountpoint check failed for %s\n", dd));
+		DSS_ERROR_LOG("mountpoint check failed for %s\n", dd);
 		return -E_MOUNTPOINT;
 	}
 	return 1;
@@ -1131,28 +1112,28 @@ static int check_config(void)
 	uint32_t num_intervals = OPT_UINT32_VAL(DSS, NUM_INTERVALS);
 
 	if (unit_interval == 0) {
-		DSS_ERROR_LOG(("bad unit interval: %i\n", unit_interval));
+		DSS_ERROR_LOG("bad unit interval: %i\n", unit_interval);
 		return -E_INVALID_NUMBER;
 	}
-	DSS_DEBUG_LOG(("unit interval: %i day(s)\n", unit_interval));
+	DSS_DEBUG_LOG("unit interval: %i day(s)\n", unit_interval);
 
 	if (num_intervals == 0 || num_intervals > 30) {
-		DSS_ERROR_LOG(("bad number of intervals: %i\n", num_intervals));
+		DSS_ERROR_LOG("bad number of intervals: %i\n", num_intervals);
 		return -E_INVALID_NUMBER;
 	}
 	if (subcmd == CMD_PTR(RUN) || subcmd == CMD_PTR(CREATE))
 		if (!OPT_GIVEN(DSS, SOURCE_DIR)) {
-			DSS_ERROR_LOG(("--source-dir required\n"));
+			DSS_ERROR_LOG("--source-dir required\n");
 			return -E_SYNTAX;
 		}
 	if (subcmd == CMD_PTR(RUN) || subcmd == CMD_PTR(CREATE)
 			|| subcmd == CMD_PTR(LS) || subcmd == CMD_PTR(PRUNE)) {
 		if (!OPT_GIVEN(DSS, DEST_DIR)) {
-			DSS_ERROR_LOG(("--dest-dir required\n"));
+			DSS_ERROR_LOG("--dest-dir required\n");
 			return -E_SYNTAX;
 		}
 	}
-	DSS_DEBUG_LOG(("number of intervals: %i\n", num_intervals));
+	DSS_DEBUG_LOG("number of intervals: %i\n", num_intervals);
 	return 1;
 }
 
@@ -1160,9 +1141,9 @@ static int lopsub_error(int lopsub_ret, char **errctx)
 {
 	const char *msg = lls_strerror(-lopsub_ret);
 	if (*errctx)
-		DSS_ERROR_LOG(("%s: %s\n", *errctx, msg));
+		DSS_ERROR_LOG("%s: %s\n", *errctx, msg);
 	else
-		DSS_ERROR_LOG(("%s\n", msg));
+		DSS_ERROR_LOG("%s\n", msg);
 	free(*errctx);
 	*errctx = NULL;
 	return -E_LOPSUB;
@@ -1183,8 +1164,8 @@ static int parse_config_file(bool sighup, const struct lls_command *cmd)
 	if (ret < 0) {
 		if (errno != ENOENT || OPT_GIVEN(DSS, CONFIG_FILE)) {
 			ret = -ERRNO_TO_DSS_ERROR(errno);
-			DSS_ERROR_LOG(("config file %s can not be opened\n",
-				config_file));
+			DSS_ERROR_LOG("config file %s can not be opened\n",
+				config_file);
 			goto out;
 		}
 		/* no config file -- nothing to do */
@@ -1195,7 +1176,7 @@ static int parse_config_file(bool sighup, const struct lls_command *cmd)
 	ret = fstat(fd, &statbuf);
 	if (ret < 0) {
 		ret = -ERRNO_TO_DSS_ERROR(errno);
-		DSS_ERROR_LOG(("failed to stat config file %s\n", config_file));
+		DSS_ERROR_LOG("failed to stat config file %s\n", config_file);
 		goto close_fd;
 	}
 	sz = statbuf.st_size;
@@ -1206,8 +1187,8 @@ static int parse_config_file(bool sighup, const struct lls_command *cmd)
 	map = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, fd, 0);
 	if (map == MAP_FAILED) {
 		ret = -ERRNO_TO_DSS_ERROR(errno);
-		DSS_ERROR_LOG(("failed to mmap config file %s\n",
-			config_file));
+		DSS_ERROR_LOG("failed to mmap config file %s\n",
+			config_file);
 		goto close_fd;
 	}
 	if (cmd == CMD_PTR(DSS))
@@ -1217,8 +1198,8 @@ static int parse_config_file(bool sighup, const struct lls_command *cmd)
 	ret = lls_convert_config(map, sz, subcmd_name, &cf_argv, &errctx);
 	munmap(map, sz);
 	if (ret < 0) {
-		DSS_ERROR_LOG(("failed to convert config file %s\n",
-			config_file));
+		DSS_ERROR_LOG("failed to convert config file %s\n",
+			config_file);
 		ret = lopsub_error(ret, &errctx);
 		goto close_fd;
 	}
@@ -1242,7 +1223,7 @@ static int parse_config_file(bool sighup, const struct lls_command *cmd)
 	ret = 1;
 success:
 	assert(ret >= 0);
-	DSS_DEBUG_LOG(("loglevel: %d\n", OPT_UINT32_VAL(DSS, LOGLEVEL)));
+	DSS_DEBUG_LOG("loglevel: %d\n", OPT_UINT32_VAL(DSS, LOGLEVEL));
 	if (cmd != CMD_PTR(DSS)) {
 		if (ret > 0) {
 			if (sublpr != cmdline_sublpr)
@@ -1269,7 +1250,7 @@ static int handle_sighup(void)
 {
 	int ret;
 
-	DSS_NOTICE_LOG(("SIGHUP, re-reading config\n"));
+	DSS_NOTICE_LOG("SIGHUP, re-reading config\n");
 	dump_dss_config("old");
 	ret = parse_config_file(true /* SIGHUP */, CMD_PTR(DSS));
 	if (ret < 0)
@@ -1319,7 +1300,7 @@ static int handle_signal(void)
 	}
 out:
 	if (ret < 0)
-		DSS_ERROR_LOG(("%s\n", dss_strerror(-ret)));
+		DSS_ERROR_LOG("%s\n", dss_strerror(-ret));
 	return ret;
 }
 
@@ -1381,11 +1362,11 @@ static int rename_resume_snap(int64_t creation_time)
 	s = find_orphaned_snapshot(&sl);
 out:
 	if (s) {
-		DSS_NOTICE_LOG(("recycling %s snapshot %s\n", why, s->name));
+		DSS_NOTICE_LOG("recycling %s snapshot %s\n", why, s->name);
 		ret = dss_rename(s->name, new_name);
 	}
 	if (ret >= 0)
-		DSS_NOTICE_LOG(("creating %s\n", new_name));
+		DSS_NOTICE_LOG("creating %s\n", new_name);
 	free(new_name);
 	free_snapshot_list(&sl);
 	return ret;
@@ -1418,18 +1399,18 @@ static void create_rsync_argv(char ***argv, int64_t *num)
 		seeded = true;
 	}
 	if (1000 * (random() / (RAND_MAX + 1.0)) < OPT_UINT32_VAL(DSS, CHECKSUM)) {
-		DSS_NOTICE_LOG(("adding --checksum to rsync options\n"));
+		DSS_NOTICE_LOG("adding --checksum to rsync options\n");
 		(*argv)[i++] = dss_strdup("--checksum");
 	}
 	for (j = 0; j < OPT_GIVEN(DSS, RSYNC_OPTION); j++)
 		(*argv)[i++] = dss_strdup(lls_string_val(j,
 			OPT_RESULT(DSS, RSYNC_OPTION)));
 	if (name_of_reference_snapshot) {
-		DSS_INFO_LOG(("using %s as reference\n", name_of_reference_snapshot));
+		DSS_INFO_LOG("using %s as reference\n", name_of_reference_snapshot);
 		(*argv)[i++] = make_message("--link-dest=../%s",
 			name_of_reference_snapshot);
 	} else
-		DSS_INFO_LOG(("no suitable reference snapshot found\n"));
+		DSS_INFO_LOG("no suitable reference snapshot found\n");
 	logname = dss_logname();
 	if (use_rsync_locally(logname)) {
 		for (j = 0; j < OPT_GIVEN(DSS, SOURCE_DIR); j++)
@@ -1464,7 +1445,7 @@ static void create_rsync_argv(char ***argv, int64_t *num)
 	(*argv)[i++] = incomplete_name(*num);
 	(*argv)[i++] = NULL;
 	for (j = 0; j < i; j++)
-		DSS_DEBUG_LOG(("argv[%d] = %s\n", j, (*argv)[j]));
+		DSS_DEBUG_LOG("argv[%d] = %s\n", j, (*argv)[j]);
 }
 
 static void free_rsync_argv(char **argv)
@@ -1595,7 +1576,7 @@ static void lock_dss_or_die(void)
 	int ret = lock_dss(ipc_key);
 
 	if (ret < 0) {
-		DSS_EMERG_LOG(("failed to lock: %s\n", dss_strerror(-ret)));
+		DSS_EMERG_LOG("failed to lock: %s\n", dss_strerror(-ret));
 		exit(EXIT_FAILURE);
 	}
 }
@@ -1606,12 +1587,12 @@ static int com_run(void)
 	pid_t pid;
 
 	if (OPT_GIVEN(DSS, DRY_RUN)) {
-		DSS_ERROR_LOG(("dry run not supported by this command\n"));
+		DSS_ERROR_LOG("dry run not supported by this command\n");
 		return -E_SYNTAX;
 	}
 	ret = get_dss_pid(ipc_key, &pid);
 	if (ret >= 0) {
-		DSS_ERROR_LOG(("pid %d\n", (int)pid));
+		DSS_ERROR_LOG("pid %d\n", (int)pid);
 		return -E_ALREADY_RUNNING;
 	}
 	/*
@@ -1638,8 +1619,8 @@ static int com_run(void)
 	if (fd >= 0) {
 		ret = write(fd, "\0", 1);
 		if (ret != 1) {
-			DSS_ERROR_LOG(("write to daemon pipe returned %d\n",
-				ret));
+			DSS_ERROR_LOG("write to daemon pipe returned %d\n",
+				ret);
 			if (ret < 0)
 				return -ERRNO_TO_DSS_ERROR(errno);
 			return -E_BUG;
@@ -1807,7 +1788,7 @@ static int setup_signal_handling(void)
 {
 	int ret;
 
-	DSS_INFO_LOG(("setting up signal handlers\n"));
+	DSS_INFO_LOG("setting up signal handlers\n");
 	signal_pipe = signal_init(); /* always successful */
 	ret = install_sighandler(SIGINT);
 	if (ret < 0)
@@ -1936,8 +1917,8 @@ int main(int argc, char **argv)
 out:
 	if (ret < 0) {
 		if (errctx)
-			DSS_ERROR_LOG(("%s\n", errctx));
-		DSS_EMERG_LOG(("%s\n", dss_strerror(-ret)));
+			DSS_ERROR_LOG("%s\n", errctx);
+		DSS_EMERG_LOG("%s\n", dss_strerror(-ret));
 	}
 	free(errctx);
 	lls_free_parse_result(lpr, CMD_PTR(DSS));
diff --git a/err.h b/err.h
index f567671..7e93c9d 100644
--- a/err.h
+++ b/err.h
@@ -3,8 +3,7 @@
 extern char *dss_errlist[];
 extern char *dss_error_txt;
 
-void dss_log_set_params(int ll, const char *file, int line, const char *func);
-__printf_1_2 void dss_log(const char* fmt,...);
+__printf_2_3 void dss_log(int ll, const char* fmt,...);
 
 /*
  * This bit indicates whether a number is considered a system error number
diff --git a/exec.c b/exec.c
index c538eab..3d3963f 100644
--- a/exec.c
+++ b/exec.c
@@ -17,7 +17,7 @@
 void dss_exec(pid_t *pid, const char *file, char *const *const args)
 {
 	if ((*pid = fork()) < 0) {
-		DSS_EMERG_LOG(("fork error: %s\n", strerror(errno)));
+		DSS_EMERG_LOG("fork error: %s\n", strerror(errno));
 		exit(EXIT_FAILURE);
 	}
 	if (*pid) /* parent */
@@ -26,7 +26,7 @@ void dss_exec(pid_t *pid, const char *file, char *const *const args)
 	signal(SIGTERM, SIG_DFL);
 	signal(SIGCHLD, SIG_DFL);
 	execvp(file, args);
-	DSS_EMERG_LOG(("execvp error: %s\n", strerror(errno)));
+	DSS_EMERG_LOG("execvp error: %s\n", strerror(errno));
 	_exit(EXIT_FAILURE);
 }
 
diff --git a/gcc-compat.h b/gcc-compat.h
index a70519a..fb94877 100644
--- a/gcc-compat.h
+++ b/gcc-compat.h
@@ -21,6 +21,7 @@
 #endif
 
 #define  __printf_1_2 __printf(1,2)
+#define  __printf_2_3 __printf(2,3)
 
 #if HAVE_GNUC(3,3)
 # define __must_check	__attribute__ ((warn_unused_result))
diff --git a/ipc.c b/ipc.c
index e6ec79e..b6b822f 100644
--- a/ipc.c
+++ b/ipc.c
@@ -82,7 +82,7 @@ static int mutex_get(key_t key, int flags)
 {
 	int ret;
 
-	DSS_DEBUG_LOG(("getting semaphore 0x%lx\n", (long)key));
+	DSS_DEBUG_LOG("getting semaphore 0x%lx\n", (long)key);
 	ret = semget(key, 2, flags);
 	if (ret < 0)
 		return -ERRNO_TO_DSS_ERROR(errno);
@@ -93,7 +93,7 @@ static int do_semop(int id, struct sembuf *sops, int num)
 {
 	int ret;
 
-	DSS_DEBUG_LOG(("calling semop\n"));
+	DSS_DEBUG_LOG("calling semop\n");
 	do {
 		ret = semop(id, sops, num);
 		if (ret >= 0)
@@ -107,7 +107,7 @@ static bool mutex_is_locked(int id)
 	struct sembuf sops;
 	int ret;
 
-	DSS_DEBUG_LOG(("trying to lock\n"));
+	DSS_DEBUG_LOG("trying to lock\n");
 
 	sops.sem_num = 0;
 	sops.sem_op = 0;
diff --git a/log.h b/log.h
index 3077c2e..0259abd 100644
--- a/log.h
+++ b/log.h
@@ -15,54 +15,10 @@
 /* last message before exit */
 #define EMERG 7
 
-/* Not all compilers support __func__ or an equivalent. */
-#if (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L) && !defined(__GNUC__)
-# if defined(_MSC_VER) && _MSC_VER >= 1300
-#  define __func__ __FUNCTION__
-# else
-#  define DSS_NO_FUNC_NAMES
-#  define __func__ "<unknown>"
-# endif
-#endif
-
-#define DSS_DEBUG_LOG(args) \
-	do { \
-		dss_log_set_params(DEBUG, __FILE__, __LINE__, __func__); \
-		dss_log args ; \
-	} while (0)
-
-#define DSS_INFO_LOG(args) \
-	do { \
-		dss_log_set_params(INFO, __FILE__, __LINE__, __func__); \
-		dss_log args ; \
-	} while (0)
-
-#define DSS_NOTICE_LOG(args) \
-	do { \
-		dss_log_set_params(NOTICE, __FILE__, __LINE__, __func__); \
-		dss_log args ; \
-	} while (0)
-
-#define DSS_WARNING_LOG(args) \
-	do { \
-		dss_log_set_params(WARNING, __FILE__, __LINE__, __func__); \
-		dss_log args ; \
-	} while (0)
-
-#define DSS_ERROR_LOG(args) \
-	do { \
-		dss_log_set_params(ERROR, __FILE__, __LINE__, __func__); \
-		dss_log args ; \
-	} while (0)
-
-#define DSS_CRIT_LOG(args) \
-	do { \
-		dss_log_set_params(CRIT, __FILE__, __LINE__, __func__); \
-		dss_log args ; \
-	} while (0)
-
-#define DSS_EMERG_LOG(args) \
-	do { \
-		dss_log_set_params(EMERG, __FILE__, __LINE__, __func__); \
-		dss_log args ; \
-	} while (0)
+#define DSS_DEBUG_LOG(f,...) dss_log(DEBUG, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
+#define DSS_INFO_LOG(f,...) dss_log(INFO, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
+#define DSS_NOTICE_LOG(f,...) dss_log(NOTICE, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
+#define DSS_WARNING_LOG(f,...) dss_log(WARNING, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
+#define DSS_ERROR_LOG(f,...) dss_log(ERROR, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
+#define DSS_CRIT_LOG(f,...) dss_log(CRIT, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
+#define DSS_EMERG_LOG(f,...) dss_log(EMERG, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
diff --git a/sig.c b/sig.c
index 90a8811..11efe01 100644
--- a/sig.c
+++ b/sig.c
@@ -55,7 +55,7 @@ int signal_init(void)
 		goto err_out;
 	return signal_pipe[0];
 err_out:
-	DSS_EMERG_LOG(("%s\n", dss_strerror(-ret)));
+	DSS_EMERG_LOG("%s\n", dss_strerror(-ret));
 	exit(EXIT_FAILURE);
 }
 
@@ -76,9 +76,9 @@ static void generic_signal_handler(int s)
 		return;
 	}
 	if (ret < 0)
-		DSS_EMERG_LOG(("%s\n", strerror(errno)));
+		DSS_EMERG_LOG("%s\n", strerror(errno));
 	else
-		DSS_EMERG_LOG(("short write to signal pipe\n"));
+		DSS_EMERG_LOG("short write to signal pipe\n");
 	exit(EXIT_FAILURE);
 }
 
@@ -99,13 +99,13 @@ int reap_child(pid_t *pid, int *status)
 	if (*pid < 0)
 		return -ERRNO_TO_DSS_ERROR(errno);
 	if (WIFEXITED(*status))
-		DSS_DEBUG_LOG(("child %i exited. Exit status: %i\n", (int)*pid,
-			WEXITSTATUS(*status)));
+		DSS_DEBUG_LOG("child %i exited. Exit status: %i\n", (int)*pid,
+			WEXITSTATUS(*status));
 	else if (WIFSIGNALED(*status))
-		DSS_DEBUG_LOG(("child %i was killed by signal %i\n", (int)*pid,
-			WTERMSIG(*status)));
+		DSS_DEBUG_LOG("child %i was killed by signal %i\n", (int)*pid,
+			WTERMSIG(*status));
 	else
-		DSS_WARNING_LOG(("child %i terminated abormally\n", (int)*pid));
+		DSS_WARNING_LOG("child %i terminated abormally\n", (int)*pid);
 	return 1;
 }
 
@@ -115,7 +115,7 @@ int reap_child(pid_t *pid, int *status)
  */
 int install_sighandler(int sig)
 {
-	DSS_DEBUG_LOG(("catching signal %d\n", sig));
+	DSS_DEBUG_LOG("catching signal %d\n", sig);
 	if (signal(sig, &generic_signal_handler) != SIG_ERR)
 		return 1;
 	return -E_SIGNAL_SIG_ERR;
@@ -134,14 +134,14 @@ int next_signal(void)
 
 	r = read(signal_pipe[0], &s, sizeof(s));
 	if (r == sizeof(s)) {
-		DSS_DEBUG_LOG(("next signal: %d\n", s));
+		DSS_DEBUG_LOG("next signal: %d\n", s);
 		return s;
 	}
 	err = errno;
 	assert(r < 0);
 	if (err == EAGAIN)
 		return 0;
-	DSS_ERROR_LOG(("failed to read from signal pipe\n"));
+	DSS_ERROR_LOG("failed to read from signal pipe\n");
 	return -ERRNO_TO_DSS_ERROR(err);
 }
 
diff --git a/str.c b/str.c
index ed04e47..f507379 100644
--- a/str.c
+++ b/str.c
@@ -29,8 +29,8 @@ __must_check __malloc void *dss_realloc(void *p, size_t size)
 	 */
 	assert(size);
 	if (!(p = realloc(p, size))) {
-		DSS_EMERG_LOG(("realloc failed (size = %zu), aborting\n",
-			size));
+		DSS_EMERG_LOG("realloc failed (size = %zu), aborting\n",
+			size);
 		exit(EXIT_FAILURE);
 	}
 	return p;
@@ -44,8 +44,8 @@ __must_check __malloc void *dss_malloc(size_t size)
 	p = malloc(size);
 
 	if (!p) {
-		DSS_EMERG_LOG(("malloc failed (size = %zu),  aborting\n",
-			size));
+		DSS_EMERG_LOG("malloc failed (size = %zu),  aborting\n",
+			size);
 		exit(EXIT_FAILURE);
 	}
 	return p;
@@ -70,7 +70,7 @@ __must_check __malloc char *dss_strdup(const char *s)
 
 	if ((ret = strdup(s? s: "")))
 		return ret;
-	DSS_EMERG_LOG(("strdup failed, aborting\n"));
+	DSS_EMERG_LOG("strdup failed, aborting\n");
 	exit(EXIT_FAILURE);
 }
 
@@ -113,7 +113,7 @@ __must_check __malloc char *get_homedir(void)
 	const char *home = getenv("HOME");
 	if (home && *home)
 		return dss_strdup(home);
-	DSS_EMERG_LOG(("fatal: HOME is unset or empty\n"));
+	DSS_EMERG_LOG("fatal: HOME is unset or empty\n");
 	exit(EXIT_FAILURE);
 }