diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30dc33c3f..c68167525 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1163,6 +1163,9 @@ if (ENABLE_EXAMPLES)
srt_add_example(test-c-client.c)
srt_make_application(test-c-client)
+ srt_add_example(example-client-nonblock.c)
+ srt_make_application(example-client-nonblock)
+
srt_add_example(test-c-server.c)
srt_make_application(test-c-server)
diff --git a/examples/example-client-nonblock.c b/examples/example-client-nonblock.c
new file mode 100644
index 000000000..b711f5a38
--- /dev/null
+++ b/examples/example-client-nonblock.c
@@ -0,0 +1,165 @@
+/*
+ * SRT - Secure, Reliable, Transport
+ * Copyright (c) 2021 Haivision Systems Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; If not, see
+ */
+
+
+#include
+#include
+#ifdef _WIN32
+#define usleep(x) Sleep(x / 1000)
+#else
+#include
+#endif
+
+#include "srt.h"
+
+int main(int argc, char** argv)
+{
+ int ss, st;
+ struct sockaddr_in sa;
+ int yes = 1;
+ const char message [] = "This message should be sent to the other side";
+
+ if (argc != 3) {
+ fprintf(stderr, "Usage: %s \n", argv[0]);
+ return 1;
+ }
+
+ printf("SRT startup\n");
+ srt_startup();
+
+ printf("Creating SRT socket\n");
+ ss = srt_create_socket();
+ if (ss == SRT_ERROR)
+ {
+ fprintf(stderr, "srt_socket: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ printf("Creating remote address\n");
+ sa.sin_family = AF_INET;
+ sa.sin_port = htons(atoi(argv[2]));
+ if (inet_pton(AF_INET, argv[1], &sa.sin_addr) != 1)
+ {
+ return 1;
+ }
+
+ int epollid = srt_epoll_create();
+ if (epollid == -1)
+ {
+ fprintf(stderr, "srt_epoll_create: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ printf("srt setsockflag\n");
+ if (SRT_ERROR == srt_setsockflag(ss, SRTO_RCVSYN, &yes, sizeof yes)
+ || SRT_ERROR == srt_setsockflag(ss, SRTO_SNDSYN, &yes, sizeof yes))
+ {
+ fprintf(stderr, "SRTO_SNDSYN or SRTO_RCVSYN: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ // When a caller is connected, a write-readiness event is triggered.
+ int modes = SRT_EPOLL_OUT | SRT_EPOLL_ERR;
+ if (SRT_ERROR == srt_epoll_add_usock(epollid, ss, &modes))
+ {
+ fprintf(stderr, "srt_epoll_add_usock: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ printf("srt connect\n");
+ st = srt_connect(ss, (struct sockaddr*)&sa, sizeof sa);
+ if (st == SRT_ERROR)
+ {
+ fprintf(stderr, "srt_connect: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ // We had subscribed for write-readiness or error.
+ // Write readiness comes in wready array,
+ // error is notified via rready in this case.
+ int rlen = 1;
+ SRTSOCKET rready;
+ int wlen = 1;
+ SRTSOCKET wready;
+ if (srt_epoll_wait(epollid, &rready, &rlen, &wready, &wlen, -1, 0, 0, 0, 0) != -1)
+ {
+ SRT_SOCKSTATUS state = srt_getsockstate(ss);
+ if (state != SRTS_CONNECTED || rlen > 0) // rlen > 0 - an error notification
+ {
+ fprintf(stderr, "srt_epoll_wait: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ if (wlen != 1 || wready != ss)
+ {
+ fprintf(stderr, "srt_epoll_wait: wlen %d, wready %d, socket %d\n", wlen, wready, ss);
+ return 1;
+ }
+ }
+ else
+ {
+ fprintf(stderr, "srt_connect: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ int i;
+ for (i = 0; i < 100; i++)
+ {
+ rready = SRT_INVALID_SOCK;
+ rlen = 1;
+ wready = SRT_INVALID_SOCK;
+ wlen = 1;
+
+ // As we have subscribed only for write-readiness or error events,
+ // but have not subscribed for read-readiness,
+ // through readfds we are notified about an error.
+ int timeout_ms = 5000; // ms
+ int res = srt_epoll_wait(epollid, &rready, &rlen, &wready, &wlen, timeout_ms, 0, 0, 0, 0);
+ if (res == SRT_ERROR || rlen > 0)
+ {
+ fprintf(stderr, "srt_epoll_wait: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ printf("srt sendmsg2 #%d >> %s\n", i, message);
+ st = srt_sendmsg2(ss, message, sizeof message, NULL);
+ if (st == SRT_ERROR)
+ {
+ fprintf(stderr, "srt_sendmsg: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ usleep(1000); // 1 ms
+ }
+
+ // Let's wait a bit so that all packets reach destination
+ usleep(100000); // 100 ms
+
+ // In live mode the connection will be closed even if some packets were not yet acknowledged.
+ printf("srt close\n");
+ st = srt_close(ss);
+ if (st == SRT_ERROR)
+ {
+ fprintf(stderr, "srt_close: %s\n", srt_getlasterror_str());
+ return 1;
+ }
+
+ printf("srt cleanup\n");
+ srt_cleanup();
+ return 0;
+}