Correctly handle EINTR during sendmsg in QuicSocketUtils::WritePacket.

net/tools/quic/quic_socket_utils.cc

 // Copyright (c) 2012 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 "net/tools/quic/quic_socket_utils.h"
 
 #include <errno.h>
 #include <netinet/in.h>
 #include <string.h>
 #include <sys/socket.h>
@@ skipping 195 matching lines @@
     hdr.msg_control = 0;
     hdr.msg_controllen = 0;
   } else {
     hdr.msg_control = cbuf;
     hdr.msg_controllen = kSpaceForIp;
     cmsghdr* cmsg = CMSG_FIRSTHDR(&hdr);
     SetIpInfoInCmsg(self_address, cmsg);
     hdr.msg_controllen = cmsg->cmsg_len;
   }
 
-  int rc = sendmsg(fd, &hdr, 0);
+  int rc;
+  do {
+    rc = sendmsg(fd, &hdr, 0);
+  } while (rc < 0 && errno == EINTR);
   if (rc >= 0) {
     return WriteResult(WRITE_STATUS_OK, rc);
   }
   return WriteResult((errno == EAGAIN || errno == EWOULDBLOCK)
                          ? WRITE_STATUS_BLOCKED
                          : WRITE_STATUS_ERROR,
                      errno);
 }
 
 // static
@@ skipping 25 matching lines @@
 
   rc = QuicSocketUtils::SetGetAddressInfo(fd, address_family);
   if (rc < 0) {
     LOG(ERROR) << "IP detection not supported" << strerror(errno);
     return -1;
   }
   return fd;
 }
 
 }  // namespace net