Revise usage of print_{error,fatal}()

Let's limit print_fatal() to unexpected conditions.

Also added exit_fatal() to save a few lines of code.

src/common.c

@@ -131,11 +131,19 @@ log_message (int priority, const char *quote, const char *fmt, ...)
 	va_end (ap);
 }
 
+// `fatal' is reserved for unexpected failures that would harm further operation
+
 #define print_fatal(...)    log_message (LOG_ERR,     "fatal: ",   __VA_ARGS__)
 #define print_error(...)    log_message (LOG_ERR,     "error: ",   __VA_ARGS__)
 #define print_warning(...)  log_message (LOG_WARNING, "warning: ", __VA_ARGS__)
 #define print_status(...)   log_message (LOG_INFO,    "-- ",       __VA_ARGS__)
 
+#define exit_fatal(...)                                                        \
+	BLOCK_START                                                                \
+		print_fatal (__VA_ARGS__);                                             \
+		exit (EXIT_FAILURE);                                                   \
+	BLOCK_END
+
 // --- Debugging and assertions ------------------------------------------------
 
 // We should check everything that may possibly fail with at least a soft
@@ -191,10 +199,7 @@ xmalloc (size_t n)
 {
 	void *p = malloc (n);
 	if (!p)
-	{
+		exit_fatal ("malloc: %s", strerror (errno));
-		print_fatal ("malloc: %s", strerror (errno));
-		exit (EXIT_FAILURE);
-	}
 	return p;
 }
 
@@ -203,10 +208,7 @@ xcalloc (size_t n, size_t m)
 {
 	void *p = calloc (n, m);
 	if (!p && n && m)
-	{
+		exit_fatal ("calloc: %s", strerror (errno));
-		print_fatal ("calloc: %s", strerror (errno));
-		exit (EXIT_FAILURE);
-	}
 	return p;
 }
 
@@ -215,10 +217,7 @@ xrealloc (void *o, size_t n)
 {
 	void *p = realloc (o, n);
 	if (!p && n)
-	{
+		exit_fatal ("realloc: %s", strerror (errno));
-		print_fatal ("realloc: %s", strerror (errno));
-		exit (EXIT_FAILURE);
-	}
 	return p;
 }
 
@@ -228,8 +227,7 @@ xreallocarray (void *o, size_t n, size_t m)
 	if (m && n > SIZE_MAX / m)
 	{
 		errno = ENOMEM;
-		print_fatal ("reallocarray: %s", strerror (errno));
+		exit_fatal ("reallocarray: %s", strerror (errno));
-		exit (EXIT_FAILURE);
 	}
 	return xrealloc (o, n * m);
 }
@@ -1170,10 +1168,7 @@ poller_run (struct poller *self)
 	while (n_fds == -1 && errno == EINTR);
 
 	if (n_fds == -1)
-	{
+		exit_fatal ("%s: %s", "epoll", strerror (errno));
-		print_fatal ("%s: %s", "epoll", strerror (errno));
-		exit (EXIT_FAILURE);
-	}
 
 	poller_timers_dispatch (&self->timers);
 
@@ -1312,10 +1307,7 @@ poller_run (struct poller *self)
 	while (result == -1 && errno == EINTR);
 
 	if (result == -1)
-	{
+		exit_fatal ("%s: %s", "poll", strerror (errno));
-		print_fatal ("%s: %s", "poll", strerror (errno));
-		exit (EXIT_FAILURE);
-	}
 
 	poller_timers_dispatch (&self->timers);
 
@@ -1931,7 +1923,7 @@ call_write_default_config (const char *hint, const struct config_item *table)
 	char *filename = write_default_config (hint, prolog, table, &e);
 	if (!filename)
 	{
-		print_fatal ("%s", e->message);
+		print_error ("%s", e->message);
 		error_free (e);
 		exit (EXIT_FAILURE);
 	}

src/kike.c

@@ -65,10 +65,7 @@ static void
 setup_signal_handlers (void)
 {
 	if (pipe (g_signal_pipe) == -1)
-	{
+		exit_fatal ("%s: %s", "pipe", strerror (errno));
-		print_fatal ("pipe: %s", strerror (errno));
-		exit (EXIT_FAILURE);
-	}
 
 	set_cloexec (g_signal_pipe[0]);
 	set_cloexec (g_signal_pipe[1]);
@@ -87,10 +84,7 @@ setup_signal_handlers (void)
 	sa.sa_handler = sigterm_handler;
 	if (sigaction (SIGINT, &sa, NULL) == -1
 	 || sigaction (SIGTERM, &sa, NULL) == -1)
-	{
+		exit_fatal ("%s: %s", "sigaction", strerror (errno));
-		print_error ("sigaction: %s", strerror (errno));
-		exit (EXIT_FAILURE);
-	}
 }
 
 // --- IRC token validation ----------------------------------------------------
@@ -1011,10 +1005,8 @@ on_irc_client_available (const struct pollfd *pfd, void *user_data)
 
 			// TODO: handle resource exhaustion (EMFILE, ENFILE) specially
 			//   (stop accepting new connections and wait until we close some).
-			print_fatal ("%s: %s", "accept", strerror (errno));
-
 			// FIXME: handle this better, bring the server down cleanly.
-			exit (EXIT_FAILURE);
+			exit_fatal ("%s: %s", "accept", strerror (errno));
 		}
 
 		char host[NI_MAXHOST] = "unknown", port[NI_MAXSERV] = "unknown";
@@ -1363,7 +1355,7 @@ main (int argc, char *argv[])
 			call_write_default_config (optarg, g_config_table);
 			exit (EXIT_SUCCESS);
 		default:
-			print_fatal ("error in options");
+			print_error ("wrong options");
 			exit (EXIT_FAILURE);
 		}
 	}
@@ -1384,7 +1376,7 @@ main (int argc, char *argv[])
 	struct error *e = NULL;
 	if (!read_config_file (&ctx.config, &e))
 	{
-		print_fatal ("error loading configuration: %s", e->message);
+		print_error ("error loading configuration: %s", e->message);
 		error_free (e);
 		exit (EXIT_FAILURE);
 	}

src/zyklonb.c

@@ -420,10 +420,7 @@ static void
 setup_signal_handlers (void)
 {
 	if (pipe (g_signal_pipe) == -1)
-	{
+		exit_fatal ("%s: %s", "pipe", strerror (errno));
-		print_fatal ("pipe: %s", strerror (errno));
-		exit (EXIT_FAILURE);
-	}
 
 	set_cloexec (g_signal_pipe[0]);
 	set_cloexec (g_signal_pipe[1]);
@@ -440,17 +437,14 @@ setup_signal_handlers (void)
 	sigemptyset (&sa.sa_mask);
 
 	if (sigaction (SIGCHLD, &sa, NULL) == -1)
-	{
+		exit_fatal ("sigaction: %s", strerror (errno));
-		print_fatal ("sigaction: %s", strerror (errno));
-		exit (EXIT_FAILURE);
-	}
 
 	signal (SIGPIPE, SIG_IGN);
 
 	sa.sa_handler = sigterm_handler;
 	if (sigaction (SIGINT, &sa, NULL) == -1
 	 || sigaction (SIGTERM, &sa, NULL) == -1)
-		print_error ("sigaction: %s", strerror (errno));
+		exit_fatal ("sigaction: %s", strerror (errno));
 }
 
 static void
@@ -587,7 +581,7 @@ setup_recovery_handler (struct bot_context *ctx)
 	bool recover;
 	if (!set_boolean_if_valid (&recover, recover_str))
 	{
-		print_fatal ("invalid configuration value for `%s'", "recover");
+		print_error ("invalid configuration value for `%s'", "recover");
 		exit (EXIT_FAILURE);
 	}
 	if (!recover)
@@ -968,7 +962,7 @@ plugin_load (struct bot_context *ctx, const char *name, struct error **e)
 		execve (argv[0], argv, environ);
 
 		// We will collect the failure later via SIGCHLD
-		print_fatal ("%s: %s: %s",
+		print_error ("%s: %s: %s",
 			"failed to load the plugin", "exec", strerror (errno));
 		_exit (EXIT_FAILURE);
 	}
@@ -1495,7 +1489,7 @@ on_irc_readable (const struct pollfd *fd, struct bot_context *ctx)
 
 		if (buf->len >= (1 << 20))
 		{
-			print_fatal ("the IRC server seems to spew out data frantically");
+			print_error ("the IRC server seems to spew out data frantically");
 			irc_shutdown (ctx);
 			goto end;
 		}
@@ -1703,7 +1697,7 @@ main (int argc, char *argv[])
 			call_write_default_config (optarg, g_config_table);
 			exit (EXIT_SUCCESS);
 		default:
-			print_fatal ("error in options");
+			print_error ("wrong options");
 			exit (EXIT_FAILURE);
 		}
 	}
@@ -1723,7 +1717,7 @@ main (int argc, char *argv[])
 	struct error *e = NULL;
 	if (!read_config_file (&ctx.config, &e))
 	{
-		print_fatal ("error loading configuration: %s", e->message);
+		print_error ("error loading configuration: %s", e->message);
 		error_free (e);
 		exit (EXIT_FAILURE);
 	}