test: Add UniqueFD test

Add a unit test to exercise the API of the UniqueFD class.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>

2 files changed, 221 insertions, 0 deletions

diff --git a/test/meson.build b/test/meson.build
index d0466f17..42dfbc1f 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -53,6 +53,7 @@ internal_tests = [
     ['threads',                         'threads.cpp'],
     ['timer',                           'timer.cpp'],
     ['timer-thread',                    'timer-thread.cpp'],
+    ['unique-fd',                       'unique-fd.cpp'],
     ['utils',                           'utils.cpp'],
 ]
 
diff --git a/test/unique-fd.cpp b/test/unique-fd.cpp
new file mode 100644
index 00000000..eb3b591f
--- /dev/null
+++ b/test/unique-fd.cpp
@@ -0,0 +1,220 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * unique-fd.cpp - UniqueFD test
+ */
+
+#include <fcntl.h>
+#include <iostream>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <libcamera/base/unique_fd.h>
+#include <libcamera/base/utils.h>
+
+#include "test.h"
+
+using namespace libcamera;
+using namespace std;
+
+class UniqueFDTest : public Test
+{
+protected:
+	int init() override
+	{
+		return createFd();
+	}
+
+	int run() override
+	{
+		/* Test creating empty UniqueFD. */
+		UniqueFD fd;
+
+		if (fd.isValid() || fd.get() != -1) {
+			std::cout << "Failed fd check (default constructor)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		/* Test creating UniqueFD from numerical file descriptor. */
+		UniqueFD fd2(fd_);
+		if (!fd2.isValid() || fd2.get() != fd_) {
+			std::cout << "Failed fd check (fd constructor)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (!isValidFd(fd_)) {
+			std::cout << "Failed fd validity (fd constructor)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		/* Test move constructor. */
+		UniqueFD fd3(std::move(fd2));
+		if (!fd3.isValid() || fd3.get() != fd_) {
+			std::cout << "Failed fd check (move constructor)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (fd2.isValid() || fd2.get() != -1) {
+			std::cout << "Failed moved fd check (move constructor)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (!isValidFd(fd_)) {
+			std::cout << "Failed fd validity (move constructor)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		/* Test move assignment operator. */
+		fd = std::move(fd3);
+		if (!fd.isValid() || fd.get() != fd_) {
+			std::cout << "Failed fd check (move assignment)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (fd3.isValid() || fd3.get() != -1) {
+			std::cout << "Failed moved fd check (move assignment)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (!isValidFd(fd_)) {
+			std::cout << "Failed fd validity (move assignment)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		/* Test swapping. */
+		fd2.swap(fd);
+		if (!fd2.isValid() || fd2.get() != fd_) {
+			std::cout << "Failed fd check (swap)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (fd.isValid() || fd.get() != -1) {
+			std::cout << "Failed swapped fd check (swap)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (!isValidFd(fd_)) {
+			std::cout << "Failed fd validity (swap)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		/* Test release. */
+		int numFd = fd2.release();
+		if (fd2.isValid() || fd2.get() != -1) {
+			std::cout << "Failed fd check (release)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (numFd != fd_) {
+			std::cout << "Failed released fd check (release)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (!isValidFd(fd_)) {
+			std::cout << "Failed fd validity (release)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		/* Test reset assignment. */
+		fd.reset(numFd);
+		if (!fd.isValid() || fd.get() != fd_) {
+			std::cout << "Failed fd check (reset assignment)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (!isValidFd(fd_)) {
+			std::cout << "Failed fd validity (reset assignment)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		/* Test reset destruction. */
+		fd.reset();
+		if (fd.isValid() || fd.get() != -1) {
+			std::cout << "Failed fd check (reset destruction)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		if (isValidFd(fd_)) {
+			std::cout << "Failed fd validity (reset destruction)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		/* Test destruction. */
+		if (createFd() == TestFail) {
+			std::cout << "Failed to recreate test fd"
+				  << std::endl;
+			return TestFail;
+		}
+
+		{
+			UniqueFD fd4(fd_);
+		}
+
+		if (isValidFd(fd_)) {
+			std::cout << "Failed fd validity (destruction)"
+				  << std::endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+
+	void cleanup() override
+	{
+		if (fd_ > 0)
+			close(fd_);
+	}
+
+private:
+	int createFd()
+	{
+		fd_ = open("/tmp", O_TMPFILE | O_RDWR, S_IRUSR | S_IWUSR);
+		if (fd_ < 0)
+			return TestFail;
+
+		/* Cache inode number of temp file. */
+		struct stat s;
+		if (fstat(fd_, &s))
+			return TestFail;
+
+		inodeNr_ = s.st_ino;
+
+		return 0;
+	}
+
+	bool isValidFd(int fd)
+	{
+		struct stat s;
+		if (fstat(fd, &s))
+			return false;
+
+		/* Check that inode number matches cached temp file. */
+		return s.st_ino == inodeNr_;
+	}
+
+	int fd_;
+	ino_t inodeNr_;
+};
+
+TEST_REGISTER(UniqueFDTest)