Rename AsyncSignalSafeWriteToStderr to AsyncSignalSafeWriteError.

It no longer strictly writes to stderr, since Emscripten/WebAssembly now use _emscripten_err which might be replaced by something that is not the same as stderr by the host.

PiperOrigin-RevId: 540655336
Change-Id: Icc2a430a0db53a1282ef5558e9f3648db67e972c

absl/base/internal/raw_logging.cc

@@ -177,7 +177,7 @@ void RawLogVA(absl::LogSeverity severity, const char* file, int line,
     } else {
       DoRawLog(&buf, &size, "%s", kTruncated);
     }
-    AsyncSignalSafeWriteToStderr(buffer, strlen(buffer));
+    AsyncSignalSafeWriteError(buffer, strlen(buffer));
   }
 #else
   static_cast<void>(format);
@@ -205,7 +205,7 @@ void DefaultInternalLog(absl::LogSeverity severity, const char* file, int line,
 
 }  // namespace
 
-void AsyncSignalSafeWriteToStderr(const char* s, size_t len) {
+void AsyncSignalSafeWriteError(const char* s, size_t len) {
   absl::base_internal::ErrnoSaver errno_saver;
 #if defined(__EMSCRIPTEN__)
   // In WebAssembly, bypass filesystem emulation via fwrite.

absl/base/internal/raw_logging.h

@@ -130,7 +130,7 @@ void RawLog(absl::LogSeverity severity, const char* file, int line,
 
 // Writes the provided buffer directly to stderr, in a signal-safe, low-level
 // manner.  Preserves errno.
-void AsyncSignalSafeWriteToStderr(const char* s, size_t len);
+void AsyncSignalSafeWriteError(const char* s, size_t len);
 
 // compile-time function to get the "base" filename, that is, the part of
 // a filename after the last "/" or "\" path separator.  The search starts at

absl/debugging/failure_signal_handler.cc

@@ -378,8 +378,7 @@ static void AbslFailureSignalHandler(int signo, siginfo_t*, void* ucontext) {
   // First write to stderr.
   WriteFailureInfo(
       signo, ucontext, my_cpu, +[](const char* data) {
-        absl::raw_log_internal::AsyncSignalSafeWriteToStderr(data,
-                                                             strlen(data));
+        absl::raw_log_internal::AsyncSignalSafeWriteError(data, strlen(data));
       });
 
   // Riskier code (because it is less likely to be async-signal-safe)