linux: cut down on EPIPE error spew

ipc/ipc_channel_posix.cc

 // Copyright (c) 2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ipc/ipc_channel_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/types.h>
@@ skipping 429 matching lines @@
       if (bytes_read < 0) {
         if (errno == EAGAIN) {
           return true;
 #if defined(OS_MACOSX)
         } else if (errno == EPERM) {
           // On OSX, reading from a pipe with no listener returns EPERM
           // treat this as a special case to prevent spurious error messages
           // to the console.
           return false;
 #endif  // defined(OS_MACOSX)
-        } else if (errno == ECONNRESET) {
+        } else if (errno == ECONNRESET || errno == EPIPE) {
           return false;
         } else {
           PLOG(ERROR) << "pipe error (" << pipe_ << ")";
           return false;
         }
       } else if (bytes_read == 0) {
         // The pipe has closed...
         return false;
       }
     }
@@ skipping 344 matching lines @@
       msg->file_descriptor_set()->CommitAll();
 
     if (bytes_written < 0 && errno != EAGAIN) {
 #if defined(OS_MACOSX)
       // On OSX writing to a pipe with no listener returns EPERM.
       if (errno == EPERM) {
         Close();
         return false;
       }
 #endif  // OS_MACOSX
+      if (errno == EPIPE) {
+        Close();
+        return false;
+      }
       PLOG(ERROR) << "pipe error on " << fd_written;
       return false;
     }
 
     if (static_cast<size_t>(bytes_written) != amt_to_write) {
       if (bytes_written > 0) {
         // If write() fails with EAGAIN then bytes_written will be -1.
         message_send_bytes_written_ += bytes_written;
       }
 
@@ skipping 181 matching lines @@
 
 bool Channel::Send(Message* message) {
   return channel_impl_->Send(message);
 }
 
 int Channel::GetClientFileDescriptor() const {
   return channel_impl_->GetClientFileDescriptor();
 }
 
 }  // namespace IPC