Log to zygiskd

loader/src/common/logging.cpp

@@ -0,0 +1,36 @@
+#include <android/log.h>
+#include <unistd.h>
+
+#include "logging.h"
+#include "socket_utils.h"
+
+namespace logging {
+    static int logfd = -1;
+
+    void setfd(int fd) {
+        close(logfd);
+        logfd = fd;
+    }
+
+    int getfd() {
+        return logfd;
+    }
+
+    void log(int prio, const char* tag, const char* fmt, ...) {
+        if (logfd == -1) {
+            va_list ap;
+            va_start(ap, fmt);
+            __android_log_vprint(prio, tag, fmt, ap);
+            va_end(ap);
+        } else {
+            char buf[BUFSIZ];
+            va_list ap;
+            va_start(ap, fmt);
+            vsnprintf(buf, sizeof(buf), fmt, ap);
+            va_end(ap);
+            socket_utils::write_u8(logfd, prio);
+            socket_utils::write_string(logfd, tag);
+            socket_utils::write_string(logfd, buf);
+        }
+    }
+}