Increments a counter when QuicLinuxSocketUtils::WritePacket receives an error with errno=ENOBUFS.

PiperOrigin-RevId: 727538572

Author: wu-bin

quiche/quic/core/quic_linux_socket_utils.cc

@@ -12,6 +12,7 @@
 #include <string>
 
 #include "quiche/quic/core/quic_syscall_wrapper.h"
+#include "quiche/quic/platform/api/quic_flag_utils.h"
 #include "quiche/quic/platform/api/quic_ip_address.h"
 #include "quiche/quic/platform/api/quic_logging.h"
 #include "quiche/quic/platform/api/quic_socket_address.h"
@@ -270,6 +271,10 @@ WriteResult QuicLinuxSocketUtils::WritePacket(int fd, const QuicMsgHdr& hdr) {
   if (rc >= 0) {
     return WriteResult(WRITE_STATUS_OK, rc);
   }
+  if (errno == ENOBUFS) {
+    QUIC_CODE_COUNT(quic_sendmsg_enobufs);
+    errno = ENOBUFS;
+  }
   return WriteResult((errno == EAGAIN || errno == EWOULDBLOCK)
                          ? WRITE_STATUS_BLOCKED
                          : WRITE_STATUS_ERROR,