Enable RAW logging on Android via logcat

PiperOrigin-RevId: 437007814
Change-Id: I9d1efe71adf169d1552c97e4ed39cc33f14adc85

sandboxed_api/util/BUILD.bazel

@@ -114,6 +114,7 @@ cc_library(
     copts = sapi_platform_copts(),
     deps = [
         ":strerror",
+        "//sandboxed_api:config",
         "@com_google_absl//absl/base:config",
         "@com_google_absl//absl/base:core_headers",
         "@com_google_absl//absl/base:log_severity",

sandboxed_api/util/raw_logging.cc

@@ -31,6 +31,10 @@
 #include "absl/strings/str_cat.h"
 #include "absl/strings/str_format.h"
 
+#ifdef __ANDROID__
+#include "android/log.h"
+#endif
+
 static const char kTruncated[] = " ... (message truncated)\n";
 
 // sprintf the format to the buffer, adjusting *buf and *size to reflect the
@@ -77,6 +81,23 @@ bool DoRawLog(char** buf, int* size, const char* format, ...) {
   return true;
 }
 
+#ifdef __ANDROID__
+android_LogPriority ConvertSeverity(absl::LogSeverity severity) {
+  switch (severity) {
+    case absl::LogSeverity::kInfo:
+      return ANDROID_LOG_INFO;
+    case absl::LogSeverity::kWarning:
+      return ANDROID_LOG_WARN;
+    case absl::LogSeverity::kError:
+      return ANDROID_LOG_ERROR;
+    case absl::LogSeverity::kFatal:
+      return ANDROID_LOG_FATAL;
+    default:
+      return ANDROID_LOG_INFO;
+  }
+}
+#endif
+
 void RawLogVA(absl::LogSeverity severity, const char* file, int line,
               const char* format, va_list ap) ABSL_PRINTF_ATTRIBUTE(4, 0);
 void RawLogVA(absl::LogSeverity severity, const char* file, int line,
@@ -93,7 +114,13 @@ void RawLogVA(absl::LogSeverity severity, const char* file, int line,
   } else {
     DoRawLog(&buf, &size, "%s", kTruncated);
   }
+#ifndef __ANDROID__
   sapi::raw_logging_internal::SafeWriteToStderr(buffer, strlen(buffer));
+#else
+  // Logs to Android's logcat with the TAG SAPI and the log line containing
+  // the code location and the log output.
+  __android_log_print(ConvertSeverity(severity), "SAPI", "%s", buffer);
+#endif
 
   // Abort the process after logging a FATAL message, even if the output itself
   // was suppressed.

sandboxed_api/util/raw_logging.h

@@ -41,7 +41,10 @@
 #define SAPI_INTERNAL_UNREACHABLE
 #endif
 
-#ifdef ABSL_RAW_LOG
+// Exclude ABSL_RAW_LOG when running on Android because it will not be visible
+// in logcat since Android sends anything written to stdout and stderr to
+// /dev/null.
+#if defined(ABSL_RAW_LOG) && !(__ANDROID__)
 #define SAPI_RAW_LOG ABSL_RAW_LOG
 #else
 // This is similar to LOG(severity) << format..., but