Hi, Recently I was porting a program that uses Boost Asio to OpenBSD and found it was exiting frequently with SIGPIPE. This doesn't happen on Linux because on that platform Asio passes the MSG_NOSIGNAL flag to sendmsg(2). (It doesn't on FreeBSD either because Asio uses the SO_NOSIGNAL socket option there.)
The patch below for Boost 1.67 sets MSG_NOSIGNAL on OpenBSD too. Could you add it to the patches in the ports tree? I've also submitted it upstream [1] but not sure if/when it will be applied. --- boost/asio/detail/impl/socket_ops.ipp.orig Sun Sep 20 09:48:05 2020 +++ boost/asio/detail/impl/socket_ops.ipp Sun Sep 20 09:52:00 2020 @@ -1178,7 +1178,7 @@ msghdr msg = msghdr(); msg.msg_iov = const_cast<buf*>(bufs); msg.msg_iovlen = static_cast<int>(count); -#if defined(__linux__) +#if defined(__linux__) || defined(__OpenBSD__) flags |= MSG_NOSIGNAL; #endif // defined(__linux__) signed_size_type result = error_wrapper(::sendmsg(s, &msg, flags), ec); @@ -1307,7 +1307,7 @@ msg.msg_namelen = static_cast<int>(addrlen); msg.msg_iov = const_cast<buf*>(bufs); msg.msg_iovlen = static_cast<int>(count); -#if defined(__linux__) +#if defined(__linux__) || defined(__OpenBSD__) flags |= MSG_NOSIGNAL; #endif // defined(__linux__) signed_size_type result = error_wrapper(::sendmsg(s, &msg, flags), ec); [1] https://github.com/chriskohlhoff/asio/pull/549 -- Thanks, Nick
