tests: compile some tools/tests as C++

[lttng-tools.git] / tests / utils / utils.cpp

diff --git a/tests/utils/utils.cpp b/tests/utils/utils.cpp
new file mode 100644 (file)
index 0000000..fee74e9
--- /dev/null
+++ b/tests/utils/utils.cpp
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#include <common/compat/time.h>
+#include <common/time.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <common/compat/errno.h>
+#include <common/macros.h>
+
+#include "utils.h"
+
+static inline
+int64_t elapsed_time_ns(struct timespec *t1, struct timespec *t2)
+{
+       struct timespec delta;
+
+       LTTNG_ASSERT(t1 && t2);
+       delta.tv_sec = t2->tv_sec - t1->tv_sec;
+       delta.tv_nsec = t2->tv_nsec - t1->tv_nsec;
+       return ((int64_t) NSEC_PER_SEC * (int64_t) delta.tv_sec) +
+                       (int64_t) delta.tv_nsec;
+}
+
+int usleep_safe(useconds_t usec)
+{
+       int ret = 0;
+       struct timespec t1, t2;
+       int64_t time_remaining_ns = (int64_t) usec * (int64_t) NSEC_PER_USEC;
+
+       ret = lttng_clock_gettime(CLOCK_MONOTONIC, &t1);
+       if (ret) {
+               ret = -1;
+               perror("clock_gettime");
+               goto end;
+       }
+
+       while (time_remaining_ns > 0) {
+               ret = usleep(time_remaining_ns / (int64_t) NSEC_PER_USEC);
+               if (ret && errno != EINTR) {
+                       perror("usleep");
+                       goto end;
+               }
+
+               ret = lttng_clock_gettime(CLOCK_MONOTONIC, &t2);
+               if (ret) {
+                       perror("clock_gettime");
+                       goto end;
+               }
+
+               time_remaining_ns -= elapsed_time_ns(&t1, &t2);
+       }
+end:
+       return ret;
+}
+
+int create_file(const char *path)
+{
+       int ret;
+
+       if (!path) {
+               return -1;
+       }
+
+       ret = creat(path, S_IRWXU);
+       if (ret < 0) {
+               perror("creat");
+               return -1;
+       }
+
+       ret = close(ret);
+       if (ret < 0) {
+               perror("close");
+               return -1;
+       }
+
+       return 0;
+}
+
+int wait_on_file(const char *path)
+{
+       int ret;
+       struct stat buf;
+
+       if (!path) {
+               return -1;
+       }
+
+       for (;;) {
+               ret = stat(path, &buf);
+               if (ret == -1 && errno == ENOENT) {
+                       ret = poll(NULL, 0, 10);        /* 10 ms delay */
+                       /* Should return 0 everytime */
+                       if (ret) {
+                               if (ret < 0) {
+                                       perror("perror");
+                               } else {
+                                       fprintf(stderr,
+                                               "poll return value is larger than zero\n");
+                               }
+                               return -1;
+                       }
+                       continue;                       /* retry */
+               }
+               if (ret) {
+                       perror("stat");
+                       return -1;
+               }
+               break;  /* found */
+       }
+
+       return 0;
+}