CDRIVER-3823 ignore SIGPIPE on osx (#716)

Author: samantharitter

src/libmongoc/src/mongoc/mongoc-socket.c

@@ -993,6 +993,9 @@ mongoc_socket_new (int domain,   /* IN */
 #else
    int sd;
 #endif
+#ifdef SO_NOSIGPIPE
+   int on = 1;
+#endif
 
    ENTRY;
 
@@ -1017,6 +1020,12 @@ mongoc_socket_new (int domain,   /* IN */
       _mongoc_socket_setkeepalive (sd);
    }
 
+   /* Set SO_NOSIGPIPE, to ignore SIGPIPE on writes for platforms where
+      setting MSG_NOSIGNAL on writes is not supported (primarily OSX). */
+#ifdef SO_NOSIGPIPE
+   setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &on, sizeof(on));
+#endif
+
    sock = (mongoc_socket_t *) bson_malloc0 (sizeof *sock);
    sock->sd = sd;
    sock->domain = domain;