[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

[libvirt] [PATCH 1/3] event-test: Use goto cleanup instead of if else jungle



Like in the rest of our code we tend to prefer 'goto' and
'cleanup' over 'if else' code structure. Do the same here.

Signed-off-by: Michal Privoznik <mprivozn redhat com>
---
 examples/object-events/event-test.c | 131 +++++++++++++++++++-----------------
 1 file changed, 69 insertions(+), 62 deletions(-)

diff --git a/examples/object-events/event-test.c b/examples/object-events/event-test.c
index afac100..240caac 100644
--- a/examples/object-events/event-test.c
+++ b/examples/object-events/event-test.c
@@ -607,6 +607,8 @@ static void stop(int sig)
 
 int main(int argc, char **argv)
 {
+    int ret = EXIT_FAILURE;
+    virConnectPtr dconn = NULL;
     int callback1ret = -1;
     int callback2ret = -1;
     int callback3ret = -1;
@@ -634,28 +636,27 @@ int main(int argc, char **argv)
 
     if (argc > 1 && STREQ(argv[1], "--help")) {
         usage(argv[0]);
-        return -1;
+        goto cleanup;
     }
 
     if (virInitialize() < 0) {
         fprintf(stderr, "Failed to initialize libvirt");
-        return -1;
+        goto cleanup;
     }
 
     if (virEventRegisterDefaultImpl() < 0) {
         virErrorPtr err = virGetLastError();
         fprintf(stderr, "Failed to register event implementation: %s\n",
                 err && err->message ? err->message: "Unknown error");
-        return -1;
+        goto cleanup;
     }
 
-    virConnectPtr dconn = NULL;
     dconn = virConnectOpenAuth(argc > 1 ? argv[1] : NULL,
                                virConnectAuthPtrDefault,
                                VIR_CONNECT_RO);
     if (!dconn) {
         printf("error opening\n");
-        return -1;
+        goto cleanup;
     }
 
     virConnectRegisterCloseCallback(dconn,
@@ -760,69 +761,75 @@ int main(int argc, char **argv)
                                                      VIR_DOMAIN_EVENT_CALLBACK(myDomainEventDeviceAddedCallback),
                                                      strdup("device added"), myFreeFunc);
 
-    if ((callback1ret != -1) &&
-        (callback2ret != -1) &&
-        (callback3ret != -1) &&
-        (callback4ret != -1) &&
-        (callback5ret != -1) &&
-        (callback6ret != -1) &&
-        (callback7ret != -1) &&
-        (callback9ret != -1) &&
-        (callback10ret != -1) &&
-        (callback11ret != -1) &&
-        (callback12ret != -1) &&
-        (callback13ret != -1) &&
-        (callback14ret != -1) &&
-        (callback15ret != -1) &&
-        (callback16ret != -1) &&
-        (callback17ret != -1) &&
-        (callback18ret != -1) &&
-        (callback19ret != -1)) {
-        if (virConnectSetKeepAlive(dconn, 5, 3) < 0) {
+    if ((callback1ret == -1) ||
+        (callback2ret == -1) ||
+        (callback3ret == -1) ||
+        (callback4ret == -1) ||
+        (callback5ret == -1) ||
+        (callback6ret == -1) ||
+        (callback7ret == -1) ||
+        (callback9ret == -1) ||
+        (callback10ret == -1) ||
+        (callback11ret == -1) ||
+        (callback12ret == -1) ||
+        (callback13ret == -1) ||
+        (callback14ret == -1) ||
+        (callback15ret == -1) ||
+        (callback16ret == -1) ||
+        (callback17ret == -1) ||
+        (callback18ret == -1) ||
+        (callback19ret == -1))
+        goto cleanup;
+
+    if (virConnectSetKeepAlive(dconn, 5, 3) < 0) {
+        virErrorPtr err = virGetLastError();
+        fprintf(stderr, "Failed to start keepalive protocol: %s\n",
+                err && err->message ? err->message : "Unknown error");
+        run = 0;
+    }
+
+    while (run) {
+        if (virEventRunDefaultImpl() < 0) {
             virErrorPtr err = virGetLastError();
-            fprintf(stderr, "Failed to start keepalive protocol: %s\n",
+            fprintf(stderr, "Failed to run event loop: %s\n",
                     err && err->message ? err->message : "Unknown error");
-            run = 0;
         }
-
-        while (run) {
-            if (virEventRunDefaultImpl() < 0) {
-                virErrorPtr err = virGetLastError();
-                fprintf(stderr, "Failed to run event loop: %s\n",
-                        err && err->message ? err->message : "Unknown error");
-            }
-        }
-
-        VIR_DEBUG("Deregistering event handlers");
-        virConnectDomainEventDeregister(dconn, myDomainEventCallback1);
-        virConnectDomainEventDeregisterAny(dconn, callback2ret);
-        virConnectDomainEventDeregisterAny(dconn, callback3ret);
-        virConnectDomainEventDeregisterAny(dconn, callback4ret);
-        virConnectDomainEventDeregisterAny(dconn, callback5ret);
-        virConnectDomainEventDeregisterAny(dconn, callback6ret);
-        virConnectDomainEventDeregisterAny(dconn, callback7ret);
-        virConnectDomainEventDeregisterAny(dconn, callback9ret);
-        virConnectDomainEventDeregisterAny(dconn, callback10ret);
-        virConnectDomainEventDeregisterAny(dconn, callback11ret);
-        virConnectDomainEventDeregisterAny(dconn, callback12ret);
-        virConnectDomainEventDeregisterAny(dconn, callback13ret);
-        virConnectDomainEventDeregisterAny(dconn, callback14ret);
-        virConnectDomainEventDeregisterAny(dconn, callback15ret);
-        virConnectNetworkEventDeregisterAny(dconn, callback16ret);
-        virConnectDomainEventDeregisterAny(dconn, callback17ret);
-        virConnectDomainEventDeregisterAny(dconn, callback18ret);
-        virConnectDomainEventDeregisterAny(dconn, callback19ret);
-
-        if (callback8ret != -1)
-            virConnectDomainEventDeregisterAny(dconn, callback8ret);
     }
 
+    VIR_DEBUG("Deregistering event handlers");
+    virConnectDomainEventDeregister(dconn, myDomainEventCallback1);
+    virConnectDomainEventDeregisterAny(dconn, callback2ret);
+    virConnectDomainEventDeregisterAny(dconn, callback3ret);
+    virConnectDomainEventDeregisterAny(dconn, callback4ret);
+    virConnectDomainEventDeregisterAny(dconn, callback5ret);
+    virConnectDomainEventDeregisterAny(dconn, callback6ret);
+    virConnectDomainEventDeregisterAny(dconn, callback7ret);
+    virConnectDomainEventDeregisterAny(dconn, callback9ret);
+    virConnectDomainEventDeregisterAny(dconn, callback10ret);
+    virConnectDomainEventDeregisterAny(dconn, callback11ret);
+    virConnectDomainEventDeregisterAny(dconn, callback12ret);
+    virConnectDomainEventDeregisterAny(dconn, callback13ret);
+    virConnectDomainEventDeregisterAny(dconn, callback14ret);
+    virConnectDomainEventDeregisterAny(dconn, callback15ret);
+    virConnectNetworkEventDeregisterAny(dconn, callback16ret);
+    virConnectDomainEventDeregisterAny(dconn, callback17ret);
+    virConnectDomainEventDeregisterAny(dconn, callback18ret);
+    virConnectDomainEventDeregisterAny(dconn, callback19ret);
+
+    if (callback8ret != -1)
+        virConnectDomainEventDeregisterAny(dconn, callback8ret);
+
     virConnectUnregisterCloseCallback(dconn, connectClose);
+    ret = EXIT_SUCCESS;
 
-    VIR_DEBUG("Closing connection");
-    if (dconn && virConnectClose(dconn) < 0)
-        printf("error closing\n");
 
-    printf("done\n");
-    return 0;
+ cleanup:
+    if (dconn) {
+        VIR_DEBUG("Closing connection");
+        if (virConnectClose(dconn) < 0)
+            printf("error closing\n");
+        printf("done\n");
+    }
+
+    return ret;
 }
-- 
2.4.10


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]