logging

src/log.c

@@ -0,0 +1,56 @@
+#include <log.h>
+
+// UNIX socket for CONOUT (Console Output) - sends log datagrams to a listener on /tmp/miniroute-log.sock
+static int log_socket_fd = -1;
+static struct sockaddr_un log_dest;
+
+void Log_Init() {
+    log_socket_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
+    if (log_socket_fd < 0) {
+        perror("Log_Init: socket");
+        return;
+    }
+
+    memset(&log_dest, 0, sizeof(log_dest));
+    log_dest.sun_family = AF_UNIX;
+    strncpy(log_dest.sun_path, "/tmp/miniroute-log.sock", sizeof(log_dest.sun_path) - 1);
+}
+
+void Log_Cleanup() {
+    if (log_socket_fd >= 0) {
+        close(log_socket_fd);
+        log_socket_fd = -1;
+    }
+}
+
+static void log_emit(FILE* stream, const char* level, const char* fmt, va_list ap) {
+    char msg[1024];
+    vsnprintf(msg, sizeof(msg), fmt, ap);
+
+    char buf[1024];
+    int len = snprintf(buf, sizeof(buf), "[%s] %s\n", level, msg);
+    fputs(buf, stream);
+    if (log_socket_fd >= 0)
+        sendto(log_socket_fd, buf, len, 0, (struct sockaddr*)&log_dest, sizeof(log_dest));
+}
+
+void Log_Info(const char* fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    log_emit(stdout, "INFO", fmt, ap);
+    va_end(ap);
+}
+
+void Log_Warn(const char* fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    log_emit(stdout, "WARN", fmt, ap);
+    va_end(ap);
+}
+
+void Log_Err(const char* fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    log_emit(stderr, "ERROR", fmt, ap);
+    va_end(ap);
+}