[ovs-dev] [PATCH 2/4] Add test to ensure that time advances both normally and in a daemon.

Ben Pfaff blp at nicira.com
Wed Oct 14 23:55:00 UTC 2009


This commit adds a test to ensure that the fix that makes daemonize()
reinitialize the periodic timer actually worked.
---
 lib/timeval.c        |    3 +-
 lib/timeval.h        |    2 +
 tests/automake.mk    |    5 ++
 tests/test-timeval.c |  118 ++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/testsuite.at   |    1 +
 tests/timeval.at     |   22 +++++++++
 6 files changed, 149 insertions(+), 2 deletions(-)
 create mode 100644 tests/test-timeval.c
 create mode 100644 tests/timeval.at

diff --git a/lib/timeval.c b/lib/timeval.c
index c62f519..3ff1927 100644
--- a/lib/timeval.c
+++ b/lib/timeval.c
@@ -50,7 +50,6 @@ static void block_sigalrm(sigset_t *);
 static void unblock_sigalrm(const sigset_t *);
 static void log_poll_interval(long long int last_wakeup,
                               const struct rusage *last_rusage);
-static long long int timeval_to_msec(const struct timeval *);
 
 /* Initializes the timetracking module. */
 void
@@ -248,7 +247,7 @@ unblock_sigalrm(const sigset_t *oldsigs)
     }
 }
 
-static long long int
+long long int
 timeval_to_msec(const struct timeval *tv)
 {
     return (long long int) tv->tv_sec * 1000 + tv->tv_usec / 1000;
diff --git a/lib/timeval.h b/lib/timeval.h
index 8567d75..7da3b38 100644
--- a/lib/timeval.h
+++ b/lib/timeval.h
@@ -49,4 +49,6 @@ void time_timeval(struct timeval *);
 void time_alarm(unsigned int secs);
 int time_poll(struct pollfd *, int n_pollfds, int timeout);
 
+long long int timeval_to_msec(const struct timeval *);
+
 #endif /* timeval.h */
diff --git a/tests/automake.mk b/tests/automake.mk
index 7659a26..9336219 100644
--- a/tests/automake.mk
+++ b/tests/automake.mk
@@ -8,6 +8,7 @@ TESTSUITE_AT = \
 	tests/testsuite.at \
 	tests/lcov-pre.at \
 	tests/library.at \
+	tests/timeval.at \
 	tests/stp.at \
 	tests/ovs-vsctl.at \
 	tests/lcov-post.at
@@ -66,6 +67,10 @@ noinst_PROGRAMS += tests/test-sha1
 tests_test_sha1_SOURCES = tests/test-sha1.c
 tests_test_sha1_LDADD = lib/libopenvswitch.a
 
+noinst_PROGRAMS += tests/test-timeval
+tests_test_timeval_SOURCES = tests/test-timeval.c
+tests_test_timeval_LDADD = lib/libopenvswitch.a
+
 noinst_PROGRAMS += tests/test-type-props
 tests_test_type_props_SOURCES = tests/test-type-props.c
 
diff --git a/tests/test-timeval.c b/tests/test-timeval.c
new file mode 100644
index 0000000..ba8b3d3
--- /dev/null
+++ b/tests/test-timeval.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2009 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+
+#include "timeval.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "daemon.h"
+#include "util.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+static long long int
+gettimeofday_in_msec(void)
+{
+    struct timeval tv;
+
+    assert(!gettimeofday(&tv, NULL));
+    return timeval_to_msec(&tv);
+}
+
+static void
+do_test(void)
+{
+    /* Wait until we are awakened by a signal (typically EINTR due to the
+     * setitimer()).  Then ensure that, if time has really advanced by
+     * TIME_UPDATE_INTERVAL, then time_msec() reports that it advanced.
+     */
+    long long int start_time_msec;
+    long long int start_gtod;
+
+    start_time_msec = time_msec();
+    start_gtod = gettimeofday_in_msec();
+    for (;;) {
+        /* Wait up to 1 second.  Using select() to do the timeout avoids
+         * interfering with the interval timer. */
+        struct timeval timeout;
+        timeout.tv_sec = 1;
+        timeout.tv_usec = 0;
+        assert(select(0, NULL, NULL, NULL, &timeout) == -1 && errno == EINTR);
+
+        if (gettimeofday_in_msec() - start_gtod >= TIME_UPDATE_INTERVAL) {
+            assert(time_msec() - start_time_msec >= TIME_UPDATE_INTERVAL);
+            break;
+        }
+    }
+}
+
+static void
+usage(void)
+{
+    ovs_fatal(0, "usage: %s TEST, where TEST is \"plain\" or \"daemon\"",
+              program_name);
+}
+
+int
+main(int argc, char *argv[])
+{
+    set_program_name(argv[0]);
+    time_init();
+
+    if (argc != 2) {
+        usage();
+    } else if (!strcmp(argv[1], "plain")) {
+        do_test();
+    } else if (!strcmp(argv[1], "daemon")) {
+        /* Test that time still advances even in a daemon.  This is an
+         * interesting test because fork() cancels the interval timer. */
+        char cwd[1024];
+        FILE *success;
+
+        assert(getcwd(cwd, sizeof cwd) == cwd);
+
+        unlink("test-timeval.success");
+
+        /* Daemonize, with a pidfile in the current directory. */
+        set_detach();
+        set_pidfile(xasprintf("%s/test-timeval.pid", cwd));
+        set_no_chdir();
+        daemonize();
+
+        /* Run the test. */
+        do_test();
+
+        /* Report success by writing out a file, since the ultimate invoker of
+         * test-timeval can't wait on the daemonized process. */
+        success = fopen("test-timeval.success", "w");
+        if (!success) {
+            ovs_fatal(errno, "test-timeval.success: create failed");
+        }
+        fprintf(success, "success\n");
+        fclose(success);
+    } else {
+        usage();
+    }
+
+    return 0;
+}
diff --git a/tests/testsuite.at b/tests/testsuite.at
index c232a87..9edfdee 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -19,6 +19,7 @@ AT_TESTED([ovs-vsctl])
 
 m4_include([tests/lcov-pre.at])
 m4_include([tests/library.at])
+m4_include([tests/timeval.at])
 m4_include([tests/stp.at])
 m4_include([tests/ovs-vsctl.at])
 m4_include([tests/lcov-post.at])
diff --git a/tests/timeval.at b/tests/timeval.at
new file mode 100644
index 0000000..992706f
--- /dev/null
+++ b/tests/timeval.at
@@ -0,0 +1,22 @@
+AT_BANNER([timeval unit tests])
+
+AT_SETUP([check that time advances])
+AT_KEYWORDS([timeval])
+OVS_CHECK_LCOV([test-timeval plain], [0])
+AT_CLEANUP
+
+AT_SETUP([check that time advances after daemonize()])
+AT_KEYWORDS([timeval])
+OVS_CHECK_LCOV([test-timeval daemon], [0])
+AT_CHECK(
+  [# First try a quick sleep, so that the test completes very quickly
+   # in the normal case.  POSIX doesn't require fractional times to
+   # work, so this might not work.
+   sleep 0.1; if test -e test-timeval.success; then echo success; exit 0; fi
+   # Then wait up to 2 seconds.
+   sleep 1; if test -e test-timeval.success; then echo success; exit 0; fi
+   sleep 1; if test -e test-timeval.success; then echo success; exit 0; fi
+   echo failure; exit 1],
+  [0], [success
+], [])
+AT_CLEANUP
-- 
1.6.3.3





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