os: Add syslog logging

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/src/sys/os/os_syslog.c b/src/sys/os/os_syslog.c
new file mode 100644
index 0000000..b0e07dc
--- /dev/null
+++ b/src/sys/os/os_syslog.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <machine/uart.h>   /* shared */
+#include <sys/syslog.h>
+#include <os/spinlock.h>
+#include <string.h>
+#include <stdarg.h>
+
+static void
+syslog_write(const char *str, size_t len)
+{
+    static struct spinlock lock = {0};
+
+    spinlock_acquire(&lock);
+    for (int i = 0; i < len; ++i) {
+        uart_write(*str++);
+    }
+    spinlock_release(&lock);
+}
+
+void
+vprintf(const char *fmt, va_list *ap)
+{
+    char buffer[1024] = {0};
+
+    vsnprintf(buffer, sizeof(buffer), fmt, *ap);
+    syslog_write(buffer, strlen(buffer));
+}
+
+void
+printf(const char *fmt, ...)
+{
+    static va_list ap;
+
+    va_start(ap, fmt);
+    vprintf(fmt, &ap);
+    va_end(ap);
+}