tests: Move to kernel style SPDX license identifiers
[lttng-tools.git] / tests / utils / testapp / gen-kernel-test-events / gen-kernel-test-events.c
CommitLineData
ba5e8d0a 1/*
9d16b343
MJ
2 * Copyright (C) 2017 Francis Deslauriers <francis.deslauriers@efficios.com>
3 * Copyright (C) 2018 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
ba5e8d0a 4 *
9d16b343 5 * SPDX-License-Identifier: LGPL-2.1-only
ba5e8d0a 6 *
ba5e8d0a
MD
7 */
8
9#include <fcntl.h>
10#include <stdio.h>
11#include <string.h>
12#include <sys/stat.h>
13#include <sys/types.h>
14#include <unistd.h>
15
16#include "utils.h"
17
18#define LTTNG_MODULES_FILE "/proc/lttng-test-filter-event"
19
20/*
21 * The process waits for the creation of a file passed as argument from an
22 * external processes to execute a syscall and exiting. This is useful for tests
23 * in combinaison with LTTng's PID tracker feature where we can trace the kernel
24 * events generated by our test process only.
25 */
26int main(int argc, char **argv)
27{
28 int fd = -1, ret;
29 char *start_file, *nr_events_str;
30 ssize_t len;
31
32 if (argc != 3) {
33 fprintf(stderr, "Error: Missing argument\n");
34 fprintf(stderr, "USAGE: %s PATH_WAIT_FILE NR_EVENTS\n",
35 argv[0]);
36 ret = -1;
37 goto end;
38 }
39
40 start_file = argv[1];
41 nr_events_str = argv[2];
42
43 /*
44 * Wait for the start_file to be created by an external process
45 * (typically the test script) before executing the syscalls.
46 */
47 ret = wait_on_file(start_file);
48 if (ret != 0) {
49 goto end;
50 }
51
52 /*
53 * Start generating events.
54 */
55 fd = open(LTTNG_MODULES_FILE, O_RDWR);
56 if (fd < 0) {
57 perror("open");
58 ret = -1;
59 goto end;
60 }
61
62 len = write(fd, nr_events_str, strlen(nr_events_str) + 1);
63 if (len != strlen(nr_events_str) + 1) {
64 perror("write");
65 ret = -1;
66 } else {
67 ret = 0;
68 }
69
70end:
71 if (fd >= 0) {
72 int closeret = close(fd);
73 if (closeret) {
74 perror("close");
75 }
76 }
77 return ret;
78}
This page took 0.026028 seconds and 5 git commands to generate.