Rename C++ header files to .hpp
[lttng-tools.git] / tests / regression / tools / notification / consumer_testpoints.cpp
1 /*
2 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #include <common/compat/getenv.hpp>
9 #include <common/consumer/consumer.hpp>
10 #include <common/pipe.hpp>
11 #include <common/error.hpp>
12 #include <unistd.h>
13 #include <stdbool.h>
14 #include <lttng/constant.h>
15 #include <lttng/lttng-export.h>
16 #include <fcntl.h>
17 #include <dlfcn.h>
18 #include <stdio.h>
19
20 static char *pause_pipe_path;
21 static struct lttng_pipe *pause_pipe;
22 static int *data_consumption_state;
23 using lttng_consumer_get_type_func = enum lttng_consumer_type (*)();
24 static lttng_consumer_get_type_func lttng_consumer_get_type;
25
26 int lttng_opt_verbose;
27 int lttng_opt_mi;
28 int lttng_opt_quiet;
29
30 static
31 void __attribute__((destructor)) pause_pipe_fini(void)
32 {
33 int ret;
34
35 if (pause_pipe_path) {
36 ret = unlink(pause_pipe_path);
37 if (ret) {
38 PERROR("unlink pause pipe");
39 }
40 }
41
42 free(pause_pipe_path);
43 lttng_pipe_destroy(pause_pipe);
44 }
45
46 /*
47 * We use this testpoint, invoked at the start of the consumerd's data handling
48 * thread to create a named pipe/FIFO which a test application can use to either
49 * pause or resume the consumption of data.
50 */
51 extern "C" LTTNG_EXPORT int __testpoint_consumerd_thread_data(void);
52 int __testpoint_consumerd_thread_data(void)
53 {
54 int ret = 0;
55 const char *pause_pipe_path_prefix, *domain;
56
57 pause_pipe_path_prefix = lttng_secure_getenv(
58 "CONSUMER_PAUSE_PIPE_PATH");
59 if (!pause_pipe_path_prefix) {
60 ret = -1;
61 goto end;
62 }
63
64 /*
65 * These symbols are exclusive to the consumerd process, hence we can't
66 * rely on their presence in the sessiond. Not looking-up these symbols
67 * dynamically would not allow this shared object to be LD_PRELOAD-ed
68 * when launching the session daemon.
69 */
70 data_consumption_state = (int *) dlsym(NULL, "data_consumption_paused");
71 LTTNG_ASSERT(data_consumption_state);
72 lttng_consumer_get_type = (lttng_consumer_type (*)()) dlsym(NULL, "lttng_consumer_get_type");
73 LTTNG_ASSERT(lttng_consumer_get_type);
74
75 switch (lttng_consumer_get_type()) {
76 case LTTNG_CONSUMER_KERNEL:
77 domain = "kernel";
78 break;
79 case LTTNG_CONSUMER32_UST:
80 domain = "ust32";
81 break;
82 case LTTNG_CONSUMER64_UST:
83 domain = "ust64";
84 break;
85 default:
86 abort();
87 }
88
89 ret = asprintf(&pause_pipe_path, "%s-%s", pause_pipe_path_prefix,
90 domain);
91 if (ret < 1) {
92 ERR("Failed to allocate pause pipe path");
93 goto end;
94 }
95
96 DBG("Creating pause pipe at %s", pause_pipe_path);
97 pause_pipe = lttng_pipe_named_open(pause_pipe_path,
98 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP, O_NONBLOCK);
99 if (!pause_pipe) {
100 ERR("Failed to create pause pipe at %s", pause_pipe_path);
101 ret = -1;
102 goto end;
103 }
104
105 /* Only the read end of the pipe is useful to us. */
106 ret = lttng_pipe_write_close(pause_pipe);
107 end:
108 return ret;
109 }
110
111 extern "C" LTTNG_EXPORT int __testpoint_consumerd_thread_data_poll(void);
112 int __testpoint_consumerd_thread_data_poll(void)
113 {
114 int ret = 0;
115 uint8_t value;
116 bool value_read = false;
117
118 if (!pause_pipe) {
119 ret = -1;
120 goto end;
121 }
122
123 /* Purge pipe and only consider the freshest value. */
124 do {
125 ret = lttng_pipe_read(pause_pipe, &value, sizeof(value));
126 if (ret == sizeof(value)) {
127 value_read = true;
128 }
129 } while (ret == sizeof(value));
130
131 ret = (errno == EAGAIN) ? 0 : -errno;
132
133 if (value_read) {
134 *data_consumption_state = !!value;
135 DBG("Message received on pause pipe: %s data consumption",
136 *data_consumption_state ? "paused" : "resumed");
137 }
138 end:
139 return ret;
140 }
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