tests: test uid/gid/pid/vuid/vgid/vpid trackers

[lttng-tools.git] / tests / utils / testapp / gen-kernel-test-events / gen-kernel-test-events.c

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 (file)
index 0000000..8209379
--- /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;
+}