1 files changed, 92 insertions, 0 deletions
diff --git a/src/nvme/log.c b/src/nvme/log.c
new file mode 100644
index 0000000..e4697df
--- /dev/null
+++ b/src/nvme/log.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * This file is part of libnvme.
+ * Copyright (C) 2021 SUSE LLC
+ *
+ * Authors: Hannes Reinecke <hare@suse.de>
+ *
+ * This file implements basic logging functionality.
+ */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <time.h>
+#include <string.h>
+#define LOG_FUNCNAME 1
+#include "private.h"
+#include "log.h"
+#include "cleanup.h"
+
+#ifndef LOG_CLOCK
+#define LOG_CLOCK CLOCK_MONOTONIC
+#endif
+
+void __attribute__((format(printf, 4, 5)))
+__nvme_msg(nvme_root_t r, int lvl,
+	   const char *func, const char *format, ...)
+{
+	FILE *fp = r ? r->fp : stderr;
+	va_list ap;
+	char pidbuf[16];
+	char timebuf[32];
+	static const char *const formats[] = {
+		"%s%s%s",
+		"%s%s%s: ",
+		"%s<%s>%s ",
+		"%s<%s> %s: ",
+		"[%s] %s%s ",
+		"[%s]%s %s: ",
+		"[%s] <%s>%s ",
+		"[%s] <%s> %s: ",
+	};
+	char *header __cleanup__(cleanup_charp) = NULL;
+	char *message __cleanup__(cleanup_charp) = NULL;
+	int idx = 0;
+
+	if (r && lvl > r->log_level)
+		return;
+
+	if (r && r->log_timestamp) {
+		struct timespec now;
+
+		clock_gettime(LOG_CLOCK, &now);
+		snprintf(timebuf, sizeof(timebuf), "%6ld.%06ld",
+			 (long)now.tv_sec, now.tv_nsec / 1000);
+		idx |= 1 << 2;
+	} else
+		*timebuf = '\0';
+
+	if (r && r->log_pid) {
+		snprintf(pidbuf, sizeof(pidbuf), "%ld", (long)getpid());
+		idx |= 1 << 1;
+	} else
+		*pidbuf = '\0';
+
+	if (func)
+		idx |= 1 << 0;
+
+	if (asprintf(&header, formats[idx],
+		     timebuf, pidbuf, func ? func : "") == -1)
+		header = NULL;
+
+	va_start(ap, format);
+	if (vasprintf(&message, format, ap) == -1)
+		message = NULL;
+	va_end(ap);
+
+	fprintf(fp, "%s%s",
+		header ? header : "<error>",
+		message ? message : "<error>");
+}
+
+void nvme_init_logging(nvme_root_t r, int lvl, bool log_pid, bool log_tstamp)
+{
+	r->log_level = lvl;
+	r->log_pid = log_pid;
+	r->log_timestamp = log_tstamp;
+}