From f77c1f3413a53e9a73cac4261a526ece0790a4e8 Mon Sep 17 00:00:00 2001
From: Thanos Makatos <thanos.makatos@nutanix.com>
Date: Thu, 27 Feb 2020 06:54:56 -0500
Subject: add sample to test #47

Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com>
---
 samples/null.c | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 samples/null.c

(limited to 'samples/null.c')

diff --git a/samples/null.c b/samples/null.c
new file mode 100644
index 0000000..db21953
--- /dev/null
+++ b/samples/null.c
@@ -0,0 +1,108 @@
+/*
+ * Userspace mediated device sample application
+ *
+ * Copyright (c) 2019, Nutanix Inc. All rights reserved.
+ *     Author: Thanos Makatos <thanos@nutanix.com>
+ *             Swapnil Ingle <swapnil.ingle@nutanix.com>
+ *             Felipe Franciosi <felipe@nutanix.com>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *      * Redistributions of source code must retain the above copyright
+ *        notice, this list of conditions and the following disclaimer.
+ *      * Redistributions in binary form must reproduce the above copyright
+ *        notice, this list of conditions and the following disclaimer in the
+ *        documentation and/or other materials provided with the distribution.
+ *      * Neither the name of Nutanix nor the names of its contributors may be
+ *        used to endorse or promote products derived from this software without
+ *        specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ *  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ *  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ *  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ *  DAMAGE.
+ *
+ */
+
+/* null PCI device, doesn't do anything */
+
+#include <stdio.h>
+#include <err.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <errno.h>
+#include <string.h>
+
+#include "../lib/muser.h"
+
+static void
+null_log(void *pvt, char const *msg)
+{
+	fprintf(stderr, "%s", msg);
+}
+
+
+static void* null_drive(void *arg)
+{
+    lm_ctx_t *lm_ctx = (lm_ctx_t*)arg;
+    int ret = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
+    if (ret != 0) {
+        fprintf(stderr, "failed to enable cancel state: %s\n", strerror(ret));
+        return NULL;
+    }
+    ret = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
+    if (ret != 0) {
+        fprintf(stderr, "failed to enable cancel type: %s\n", strerror(ret));
+        return NULL;
+    }
+    printf("starting device emulation\n");
+    lm_ctx_drive(lm_ctx);
+    return NULL;
+}
+
+int main(int argc, char **argv)
+{
+    int ret;
+    pthread_t thread;
+
+    if (argc != 2) {
+        err(EXIT_FAILURE, "missing MUSER device UUID");
+    }
+
+    lm_dev_info_t dev_info = {.uuid = argv[1], .log = null_log, .log_lvl = LM_DBG };
+
+    lm_ctx_t *lm_ctx = lm_ctx_create(&dev_info);
+    if (lm_ctx == NULL) {
+        err(EXIT_FAILURE, "failed to create libmuser context");
+    }
+
+    ret = pthread_create(&thread, NULL, null_drive, lm_ctx);
+    if (ret != 0) {
+        errno = ret;
+        err(EXIT_FAILURE, "failed to create pthread");
+    }
+
+    printf("press enter to stop device emulation and clean up\n");
+    getchar();
+
+    ret = pthread_cancel(thread);
+    if (ret != 0) {
+        errno = ret;
+        err(EXIT_FAILURE, "failed to create pthread");
+    }
+    lm_ctx_destroy(lm_ctx);
+
+    printf("device emulation stopped and cleaned up, press enter to exit\n");
+    getchar();
+
+    return ret;
+}
+
+/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */
-- 
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