Linux sandbox: add a new low-level broker process mechanism.

base/posix/unix_domain_socket.cc

Index: base/posix/unix_domain_socket.cc
diff --git a/base/posix/unix_domain_socket.cc b/base/posix/unix_domain_socket.cc
index 730657dfcdbc4c5f6c87b31f5a659a2ce32abd5a..17aa6e51e3fa4d5208dfa64227fbc6bc52d0bdce 100644
--- a/base/posix/unix_domain_socket.cc
+++ b/base/posix/unix_domain_socket.cc
@@ -43,7 +43,7 @@ bool UnixDomainSocket::SendMsg(int fd,
     msg.msg_controllen = cmsg->cmsg_len;
   }
 
-  const ssize_t r = HANDLE_EINTR(sendmsg(fd, &msg, 0));
+  const ssize_t r = HANDLE_EINTR(sendmsg(fd, &msg, MSG_NOSIGNAL));
   const bool ret = static_cast<ssize_t>(length) == r;
   delete[] control_buffer;
   return ret;