X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=tests%2Futils%2Ftestapp%2Fgen-kernel-test-events%2Fgen-kernel-test-events.c;fp=tests%2Futils%2Ftestapp%2Fgen-kernel-test-events%2Fgen-kernel-test-events.c;h=820937902b70a934cfd791130f87801517214833;hp=0000000000000000000000000000000000000000;hb=ba5e8d0abf1a68803de9d773fe977792e7b0b5e8;hpb=83d6d6c4496e692df39843142cb8cf96279eaa20

diff --git a/tests/utils/testapp/gen-kernel-test-events/gen-kernel-test-events.c b/tests/utils/testapp/gen-kernel-test-events/gen-kernel-test-events.c
new file mode 100644
index 000000000..820937902
--- /dev/null
+++ b/tests/utils/testapp/gen-kernel-test-events/gen-kernel-test-events.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) - 2017 Francis Deslauriers <francis.deslauriers@efficios.com>
+ * Copyright (C) - 2018 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation; version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "utils.h"
+
+#define LTTNG_MODULES_FILE "/proc/lttng-test-filter-event"
+
+/*
+ * The process waits for the creation of a file passed as argument from an
+ * external processes to execute a syscall and exiting. This is useful for tests
+ * in combinaison with LTTng's PID tracker feature where we can trace the kernel
+ * events generated by our test process only.
+ */
+int main(int argc, char **argv)
+{
+	int fd = -1, ret;
+	char *start_file, *nr_events_str;
+	ssize_t len;
+
+	if (argc != 3) {
+		fprintf(stderr, "Error: Missing argument\n");
+		fprintf(stderr, "USAGE: %s PATH_WAIT_FILE NR_EVENTS\n",
+				argv[0]);
+		ret = -1;
+		goto end;
+	}
+
+	start_file = argv[1];
+	nr_events_str = argv[2];
+
+	/*
+	 * Wait for the start_file to be created by an external process
+	 * (typically the test script) before executing the syscalls.
+	 */
+	ret = wait_on_file(start_file);
+	if (ret != 0) {
+		goto end;
+	}
+
+	/*
+	 * Start generating events.
+	 */
+	fd = open(LTTNG_MODULES_FILE, O_RDWR);
+	if (fd < 0) {
+		perror("open");
+		ret = -1;
+		goto end;
+	}
+
+	len = write(fd, nr_events_str, strlen(nr_events_str) + 1);
+	if (len != strlen(nr_events_str) + 1) {
+		perror("write");
+		ret = -1;
+	} else {
+		ret = 0;
+	}
+
+end:
+	if (fd >= 0) {
+		int closeret = close(fd);
+		if (closeret) {
+			perror("close");
+		}
+	}
+	return ret;
+}