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dc3b014c JR |
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 | ||
18 | #include <arpa/inet.h> | |
19 | #include <assert.h> | |
20 | #include <time.h> | |
21 | #include <errno.h> | |
22 | #include <fcntl.h> | |
23 | #include <poll.h> | |
24 | #include <signal.h> | |
25 | #include <stdarg.h> | |
26 | #include <stdbool.h> | |
27 | #include <stdint.h> | |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
31 | #include <sys/mman.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <unistd.h> | |
35 | ||
36 | #define TRACEPOINT_DEFINE | |
37 | #define TRACEPOINT_PROBE_DYNAMIC_LINKAGE | |
38 | #include "tp.h" | |
39 | ||
40 | #define NSEC_PER_USEC 1000 | |
41 | #define NSEC_PER_SEC 1000000000 | |
42 | ||
43 | static inline | |
44 | int64_t elapsed_time_ns(struct timespec *t1, struct timespec *t2) | |
45 | { | |
46 | struct timespec delta; | |
47 | ||
48 | assert(t1 && t2); | |
49 | delta.tv_sec = t2->tv_sec - t1->tv_sec; | |
50 | delta.tv_nsec = t2->tv_nsec - t1->tv_nsec; | |
51 | return ((int64_t) NSEC_PER_SEC * (int64_t) delta.tv_sec) + | |
52 | (int64_t) delta.tv_nsec; | |
53 | } | |
54 | ||
55 | static inline | |
56 | int usleep_safe(useconds_t usec) | |
57 | { | |
58 | int ret = 0; | |
59 | struct timespec t1, t2; | |
60 | int64_t time_remaining_ns = (int64_t) usec * (int64_t) NSEC_PER_USEC; | |
61 | ||
62 | ret = clock_gettime(CLOCK_MONOTONIC, &t1); | |
63 | if (ret) { | |
64 | ret = -1; | |
65 | perror("clock_gettime"); | |
66 | goto end; | |
67 | } | |
68 | ||
69 | while (time_remaining_ns > 0) { | |
70 | ret = usleep(time_remaining_ns / (int64_t) NSEC_PER_USEC); | |
71 | if (ret && errno != EINTR) { | |
72 | perror("usleep"); | |
73 | goto end; | |
74 | } | |
75 | ||
76 | ret = clock_gettime(CLOCK_MONOTONIC, &t2); | |
77 | if (ret) { | |
78 | perror("clock_gettime"); | |
79 | goto end; | |
80 | } | |
81 | ||
82 | time_remaining_ns -= elapsed_time_ns(&t1, &t2); | |
83 | } | |
84 | end: | |
85 | return ret; | |
86 | } | |
87 | ||
88 | void create_file(const char *path) | |
89 | { | |
90 | static bool file_created = false; | |
91 | int ret; | |
92 | ||
93 | if (!path || file_created) { | |
94 | return; | |
95 | } | |
96 | ||
97 | ret = creat(path, S_IRWXU); | |
98 | if (ret < 0) { | |
99 | fprintf(stderr, "Failed to create file %s\n", path); | |
100 | return; | |
101 | } | |
102 | ||
103 | (void) close(ret); | |
104 | file_created = true; | |
105 | } | |
106 | ||
107 | static | |
108 | void wait_on_file(const char *path) | |
109 | { | |
110 | if (!path) { | |
111 | return; | |
112 | } | |
113 | for (;;) { | |
114 | int ret; | |
115 | struct stat buf; | |
116 | ||
117 | ret = stat(path, &buf); | |
118 | if (ret == -1 && errno == ENOENT) { | |
119 | (void) poll(NULL, 0, 10); /* 10 ms delay */ | |
120 | continue; /* retry */ | |
121 | } | |
122 | if (ret) { | |
123 | perror("stat"); | |
124 | exit(EXIT_FAILURE); | |
125 | } | |
126 | break; /* found */ | |
127 | } | |
128 | } | |
129 | ||
130 | int main(int argc, char **argv) | |
131 | { | |
132 | unsigned int i, netint; | |
133 | long values[] = { 1, 2, 3 }; | |
134 | char text[10] = "test"; | |
135 | double dbl = 2.0; | |
136 | float flt = 2222.0; | |
137 | int nr_iter = 100, ret = 0; | |
138 | useconds_t nr_usec = 0; | |
139 | char *after_first_event_file_path = NULL; | |
140 | char *before_last_event_file_path = NULL; | |
141 | ||
142 | if (argc >= 2) { | |
143 | /* | |
144 | * If nr_iter is negative, do an infinite tracing loop. | |
145 | */ | |
146 | nr_iter = atoi(argv[1]); | |
147 | } | |
148 | ||
149 | if (argc >= 3) { | |
150 | /* By default, don't wait unless user specifies. */ | |
151 | nr_usec = atoi(argv[2]); | |
152 | } | |
153 | ||
154 | if (argc >= 4) { | |
155 | after_first_event_file_path = argv[3]; | |
156 | } | |
157 | ||
158 | if (argc >= 5) { | |
159 | before_last_event_file_path = argv[4]; | |
160 | } | |
161 | ||
162 | for (i = 0; nr_iter < 0 || i < nr_iter; i++) { | |
163 | if (nr_iter >= 0 && i == nr_iter - 1) { | |
164 | /* | |
165 | * Wait on synchronization before writing last | |
166 | * event. | |
167 | */ | |
168 | wait_on_file(before_last_event_file_path); | |
169 | } | |
170 | netint = htonl(i); | |
171 | tracepoint(tp, tptest, i, netint, values, text, | |
172 | strlen(text), dbl, flt); | |
173 | tracepoint(tp, tpenum, 1); | |
174 | ||
175 | /* | |
176 | * First loop we create the file if asked to indicate | |
177 | * that at least one tracepoint has been hit. | |
178 | */ | |
179 | create_file(after_first_event_file_path); | |
180 | if (nr_usec) { | |
181 | if (usleep_safe(nr_usec)) { | |
182 | ret = -1; | |
183 | goto end; | |
184 | } | |
185 | } | |
186 | } | |
187 | ||
188 | end: | |
189 | exit(!ret ? EXIT_SUCCESS : EXIT_FAILURE); | |
190 | } |