+static void test_writing_tmpfile(void) {
+ char name[] = "/tmp/test-systemd_writing_tmpfile.XXXXXX";
+ _cleanup_free_ char *contents = NULL;
+ size_t size;
+ int fd, r;
+ struct iovec iov[3];
+
+ IOVEC_SET_STRING(iov[0], "abc\n");
+ IOVEC_SET_STRING(iov[1], ALPHANUMERICAL "\n");
+ IOVEC_SET_STRING(iov[2], "");
+
+ fd = mkostemp_safe(name, O_RDWR|O_CLOEXEC);
+ printf("tmpfile: %s", name);
+
+ r = writev(fd, iov, 3);
+ assert(r >= 0);
+
+ r = read_full_file(name, &contents, &size);
+ assert(r == 0);
+ printf("contents: %s", contents);
+ assert(streq(contents, "abc\n" ALPHANUMERICAL "\n"));
+}
+