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e7cfedd6 | 1 | /* |
e0edde6f | 2 | * Copyright (c) 2009, 2010, 2011 Nicira, Inc. |
e7cfedd6 BP |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #include <config.h> | |
18 | ||
19 | #include "timeval.h" | |
20 | ||
21 | #include <errno.h> | |
22 | #include <stdio.h> | |
93ff0290 | 23 | #include <stdlib.h> |
e7cfedd6 BP |
24 | #include <sys/time.h> |
25 | #include <sys/types.h> | |
26 | #include <unistd.h> | |
27 | ||
40f0707c | 28 | #include "command-line.h" |
e7cfedd6 BP |
29 | #include "daemon.h" |
30 | #include "util.h" | |
31 | ||
32 | #undef NDEBUG | |
33 | #include <assert.h> | |
34 | ||
35 | static long long int | |
36 | gettimeofday_in_msec(void) | |
37 | { | |
38 | struct timeval tv; | |
39 | ||
279c9e03 | 40 | xgettimeofday(&tv); |
e7cfedd6 BP |
41 | return timeval_to_msec(&tv); |
42 | } | |
43 | ||
44 | static void | |
45 | do_test(void) | |
46 | { | |
47 | /* Wait until we are awakened by a signal (typically EINTR due to the | |
48 | * setitimer()). Then ensure that, if time has really advanced by | |
49 | * TIME_UPDATE_INTERVAL, then time_msec() reports that it advanced. | |
50 | */ | |
c73814a3 | 51 | long long int start_time_msec, start_time_wall; |
e7cfedd6 BP |
52 | long long int start_gtod; |
53 | ||
54 | start_time_msec = time_msec(); | |
c73814a3 | 55 | start_time_wall = time_wall_msec(); |
e7cfedd6 BP |
56 | start_gtod = gettimeofday_in_msec(); |
57 | for (;;) { | |
58 | /* Wait up to 1 second. Using select() to do the timeout avoids | |
59 | * interfering with the interval timer. */ | |
60 | struct timeval timeout; | |
4a8535f3 BP |
61 | int retval; |
62 | ||
e7cfedd6 BP |
63 | timeout.tv_sec = 1; |
64 | timeout.tv_usec = 0; | |
4a8535f3 BP |
65 | retval = select(0, NULL, NULL, NULL, &timeout); |
66 | if (retval != -1) { | |
67 | ovs_fatal(0, "select returned %d", retval); | |
68 | } else if (errno != EINTR) { | |
69 | ovs_fatal(errno, "select reported unexpected error"); | |
70 | } | |
e7cfedd6 BP |
71 | |
72 | if (gettimeofday_in_msec() - start_gtod >= TIME_UPDATE_INTERVAL) { | |
02029a69 JG |
73 | /* gettimeofday() and time_msec() have different granularities in |
74 | * their time sources. Depending on the rounding used this could | |
75 | * result in a slight difference, so we allow for 1 ms of slop. */ | |
76 | assert(time_msec() - start_time_msec >= TIME_UPDATE_INTERVAL - 1); | |
77 | assert(time_wall_msec() - start_time_wall >= | |
78 | TIME_UPDATE_INTERVAL - 1); | |
e7cfedd6 BP |
79 | break; |
80 | } | |
81 | } | |
82 | } | |
83 | ||
84 | static void | |
85 | usage(void) | |
86 | { | |
87 | ovs_fatal(0, "usage: %s TEST, where TEST is \"plain\" or \"daemon\"", | |
88 | program_name); | |
89 | } | |
90 | ||
91 | int | |
92 | main(int argc, char *argv[]) | |
93 | { | |
40f0707c | 94 | proctitle_init(argc, argv); |
e7cfedd6 | 95 | set_program_name(argv[0]); |
e7cfedd6 BP |
96 | |
97 | if (argc != 2) { | |
98 | usage(); | |
99 | } else if (!strcmp(argv[1], "plain")) { | |
100 | do_test(); | |
101 | } else if (!strcmp(argv[1], "daemon")) { | |
102 | /* Test that time still advances even in a daemon. This is an | |
103 | * interesting test because fork() cancels the interval timer. */ | |
93ff0290 | 104 | char cwd[1024], *pidfile; |
e7cfedd6 BP |
105 | FILE *success; |
106 | ||
107 | assert(getcwd(cwd, sizeof cwd) == cwd); | |
108 | ||
109 | unlink("test-timeval.success"); | |
110 | ||
111 | /* Daemonize, with a pidfile in the current directory. */ | |
112 | set_detach(); | |
93ff0290 BP |
113 | pidfile = xasprintf("%s/test-timeval.pid", cwd); |
114 | set_pidfile(pidfile); | |
115 | free(pidfile); | |
e7cfedd6 BP |
116 | set_no_chdir(); |
117 | daemonize(); | |
118 | ||
119 | /* Run the test. */ | |
120 | do_test(); | |
121 | ||
122 | /* Report success by writing out a file, since the ultimate invoker of | |
123 | * test-timeval can't wait on the daemonized process. */ | |
124 | success = fopen("test-timeval.success", "w"); | |
125 | if (!success) { | |
126 | ovs_fatal(errno, "test-timeval.success: create failed"); | |
127 | } | |
128 | fprintf(success, "success\n"); | |
129 | fclose(success); | |
130 | } else { | |
131 | usage(); | |
132 | } | |
133 | ||
134 | return 0; | |
135 | } |