Tests: event notifier error counters
[lttng-tools.git] / tests / regression / tools / notification / sessiond_testpoints.c
1 /*
2 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0-only
6 *
7 */
8
9 #include <common/compat/getenv.h>
10 #include <common/consumer/consumer.h>
11 #include <common/pipe.h>
12 #include <common/error.h>
13 #include <unistd.h>
14 #include <stdbool.h>
15 #include <lttng/constant.h>
16 #include <fcntl.h>
17 #include <dlfcn.h>
18 #include <assert.h>
19 #include <stdio.h>
20
21 static char *pause_pipe_path;
22 static struct lttng_pipe *pause_pipe;
23 static int *notifier_notif_consumption_state;;
24
25 int lttng_opt_verbose;
26 int lttng_opt_mi;
27 int lttng_opt_quiet;
28
29 static
30 void __attribute__((destructor)) pause_pipe_fini(void)
31 {
32 int ret;
33
34 if (pause_pipe_path) {
35 ret = unlink(pause_pipe_path);
36 if (ret) {
37 PERROR("Failed to unlink pause pipe: path = %s",
38 pause_pipe_path);
39 }
40 }
41
42 free(pause_pipe_path);
43 lttng_pipe_destroy(pause_pipe);
44 }
45
46 int __testpoint_sessiond_thread_notification(void);
47 int __testpoint_sessiond_thread_notification(void)
48 {
49 int ret = 0;
50 const char *pause_pipe_path_prefix;
51
52 pause_pipe_path_prefix = lttng_secure_getenv(
53 "NOTIFIER_PAUSE_PIPE_PATH");
54 if (!pause_pipe_path_prefix) {
55 ret = -1;
56 goto end;
57 }
58
59 notifier_notif_consumption_state = dlsym(NULL, "notifier_consumption_paused");
60 assert(notifier_notif_consumption_state);
61
62 ret = asprintf(&pause_pipe_path, "%s", pause_pipe_path_prefix);
63 if (ret < 1) {
64 ERR("Failed to allocate pause pipe path");
65 goto end;
66 }
67
68 DBG("Creating pause pipe at %s", pause_pipe_path);
69 pause_pipe = lttng_pipe_named_open(pause_pipe_path,
70 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP, O_NONBLOCK);
71 if (!pause_pipe) {
72 ERR("Failed to create pause pipe at %s", pause_pipe_path);
73 ret = -1;
74 goto end;
75 }
76
77 /* Only the read end of the pipe is useful to us. */
78 ret = lttng_pipe_write_close(pause_pipe);
79 end:
80 return ret;
81 }
82
83 int __testpoint_sessiond_handle_notifier_event_pipe(void);
84 int __testpoint_sessiond_handle_notifier_event_pipe(void)
85 {
86 int ret = 0;
87 uint8_t value;
88 bool value_read = false;
89
90 if (!pause_pipe) {
91 ret = -1;
92 goto end;
93 }
94
95 /* Purge pipe and only consider the freshest value. */
96 do {
97 ret = lttng_pipe_read(pause_pipe, &value, sizeof(value));
98 if (ret == sizeof(value)) {
99 value_read = true;
100 }
101 } while (ret == sizeof(value));
102
103 ret = (errno == EAGAIN) ? 0 : -errno;
104
105 if (value_read) {
106 *notifier_notif_consumption_state = !!value;
107 DBG("Message received on pause pipe: %s data consumption",
108 *notifier_notif_consumption_state ? "paused" : "resumed");
109 }
110 end:
111 return ret;
112 }
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