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-rw-r--r--src/journal/journald.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/src/journal/journald.c b/src/journal/journald.c
new file mode 100644
index 0000000..3d40442
--- /dev/null
+++ b/src/journal/journald.c
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <unistd.h>
+
+#include "sd-daemon.h"
+#include "sd-messages.h"
+
+#include "format-util.h"
+#include "journal-authenticate.h"
+#include "journald-kmsg.h"
+#include "journald-server.h"
+#include "journald-syslog.h"
+#include "process-util.h"
+#include "sigbus.h"
+
+int main(int argc, char *argv[]) {
+ const char *namespace;
+ LogTarget log_target;
+ Server server;
+ int r;
+
+ if (argc > 2) {
+ log_error("This program takes one or no arguments.");
+ return EXIT_FAILURE;
+ }
+
+ namespace = argc > 1 ? empty_to_null(argv[1]) : NULL;
+
+ log_set_facility(LOG_SYSLOG);
+
+ if (namespace)
+ /* If we run for a log namespace, then we ourselves can log to the main journald. */
+ log_setup();
+ else {
+ /* So here's the deal if we run as the main journald: we can't be considered as regular
+ * daemon when it comes to logging hence LOG_TARGET_AUTO won't do the right thing for
+ * us. Hence explicitly log to the console if we're started from a console or to kmsg
+ * otherwise. */
+ log_target = isatty(STDERR_FILENO) > 0 ? LOG_TARGET_CONSOLE : LOG_TARGET_KMSG;
+
+ log_set_prohibit_ipc(true); /* better safe than sorry */
+ log_set_target(log_target);
+ log_parse_environment();
+ log_open();
+ }
+
+ umask(0022);
+
+ sigbus_install();
+
+ r = server_init(&server, namespace);
+ if (r < 0)
+ goto finish;
+
+ server_vacuum(&server, false);
+ server_flush_to_var(&server, true);
+ server_flush_dev_kmsg(&server);
+
+ if (server.namespace)
+ log_debug("systemd-journald running as PID "PID_FMT" for namespace '%s'.", getpid_cached(), server.namespace);
+ else
+ log_debug("systemd-journald running as PID "PID_FMT" for the system.", getpid_cached());
+
+ server_driver_message(&server, 0,
+ "MESSAGE_ID=" SD_MESSAGE_JOURNAL_START_STR,
+ LOG_MESSAGE("Journal started"),
+ NULL);
+
+ /* Make sure to send the usage message *after* flushing the
+ * journal so entries from the runtime journals are ordered
+ * before this message. See #4190 for some details. */
+ server_space_usage_message(&server, NULL);
+
+ for (;;) {
+ usec_t t = USEC_INFINITY, n;
+
+ r = sd_event_get_state(server.event);
+ if (r < 0) {
+ log_error_errno(r, "Failed to get event loop state: %m");
+ goto finish;
+ }
+ if (r == SD_EVENT_FINISHED)
+ break;
+
+ n = now(CLOCK_REALTIME);
+
+ if (server.max_retention_usec > 0 && server.oldest_file_usec > 0) {
+
+ /* The retention time is reached, so let's vacuum! */
+ if (server.oldest_file_usec + server.max_retention_usec < n) {
+ log_info("Retention time reached, rotating.");
+ server_rotate(&server);
+ server_vacuum(&server, false);
+ continue;
+ }
+
+ /* Calculate when to rotate the next time */
+ t = server.oldest_file_usec + server.max_retention_usec - n;
+ }
+
+#if HAVE_GCRYPT
+ if (server.system_journal) {
+ usec_t u;
+
+ if (journal_file_next_evolve_usec(server.system_journal->file, &u)) {
+ if (n >= u)
+ t = 0;
+ else
+ t = MIN(t, u - n);
+ }
+ }
+#endif
+
+ r = sd_event_run(server.event, t);
+ if (r < 0) {
+ log_error_errno(r, "Failed to run event loop: %m");
+ goto finish;
+ }
+
+ server_maybe_append_tags(&server);
+ server_maybe_warn_forward_syslog_missed(&server);
+ }
+
+ if (server.namespace)
+ log_debug("systemd-journald stopped as PID "PID_FMT" for namespace '%s'.", getpid_cached(), server.namespace);
+ else
+ log_debug("systemd-journald stopped as PID "PID_FMT" for the system.", getpid_cached());
+
+ server_driver_message(&server, 0,
+ "MESSAGE_ID=" SD_MESSAGE_JOURNAL_STOP_STR,
+ LOG_MESSAGE("Journal stopped"),
+ NULL);
+
+finish:
+ server_done(&server);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}