Tests: Add a test utils library
[lttng-tools.git] / tests / utils / testapp / gen-ust-events / gen-ust-events.c
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1/*
2 * Copyright (C) - 2012 David Goulet <dgoulet@efficios.com>
3 *
4 * This library is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License as published by the
6 * Free Software Foundation; version 2.1 of the License.
7 *
8 * This library is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
11 * for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this library; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16 */
17
70dac0d7 18#define _LGPL_SOURCE
209b934f 19#include <assert.h>
7e0cc23b 20#include <arpa/inet.h>
209b934f 21#include <fcntl.h>
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22#include <stdarg.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/mman.h>
27#include <sys/stat.h>
28#include <sys/types.h>
29#include <unistd.h>
0fc2834c 30#include <stdbool.h>
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31#include <signal.h>
32#include <poll.h>
33#include <errno.h>
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34
35#define TRACEPOINT_DEFINE
36#include "tp.h"
37
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38void create_file(const char *path)
39{
5fcaccbc 40 static bool file_created = false;
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41 int ret;
42
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43 if (!path || file_created) {
44 return;
45 }
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46
47 ret = creat(path, S_IRWXU);
48 if (ret < 0) {
49 fprintf(stderr, "Failed to create file %s\n", path);
50 return;
51 }
52
53 (void) close(ret);
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54 file_created = true;
55}
56
57static
58void wait_on_file(const char *path)
59{
60 if (!path) {
61 return;
62 }
63 for (;;) {
64 int ret;
65 struct stat buf;
66
67 ret = stat(path, &buf);
68 if (ret == -1 && errno == ENOENT) {
69 (void) poll(NULL, 0, 10); /* 10 ms delay */
70 continue; /* retry */
71 }
72 if (ret) {
73 perror("stat");
74 exit(EXIT_FAILURE);
75 }
76 break; /* found */
77 }
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78}
79
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80int main(int argc, char **argv)
81{
0fc2834c 82 unsigned int i, netint;
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83 long values[] = { 1, 2, 3 };
84 char text[10] = "test";
85 double dbl = 2.0;
86 float flt = 2222.0;
0fc2834c 87 int nr_iter = 100;
7e0cc23b 88 useconds_t nr_usec = 0;
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89 char *after_first_event_file_path = NULL;
90 char *before_last_event_file_path = NULL;
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91
92 if (argc >= 2) {
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93 /*
94 * If nr_iter is negative, do an infinite tracing loop.
95 */
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96 nr_iter = atoi(argv[1]);
97 }
98
2c34b645 99 if (argc >= 3) {
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100 /* By default, don't wait unless user specifies. */
101 nr_usec = atoi(argv[2]);
102 }
103
2c34b645 104 if (argc >= 4) {
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105 after_first_event_file_path = argv[3];
106 }
107
108 if (argc >= 5) {
109 before_last_event_file_path = argv[4];
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110 }
111
0fc2834c 112 for (i = 0; nr_iter < 0 || i < nr_iter; i++) {
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113 if (nr_iter >= 0 && i == nr_iter - 1) {
114 /*
115 * Wait on synchronization before writing last
116 * event.
117 */
118 wait_on_file(before_last_event_file_path);
119 }
7e0cc23b 120 netint = htonl(i);
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121 tracepoint(tp, tptest, i, netint, values, text,
122 strlen(text), dbl, flt);
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123
124 /*
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125 * First loop we create the file if asked to indicate
126 * that at least one tracepoint has been hit.
209b934f 127 */
5fcaccbc 128 create_file(after_first_event_file_path);
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129 if (nr_usec) {
130 usleep(nr_usec);
131 }
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132 }
133
134 return 0;
135}
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