[PATCH liburing 4/7] Add a C++ unit test

[Bart Van Assche <bvanassche@acm.org>]

Since the liburing header files support C++ compilers, add a C++ unit test.
This helps to verify C++ compatibility of the liburing header files.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 test/Makefile       | 12 ++++++++++++
 test/sq-full-cpp.cc | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 test/sq-full-cpp.cc

diff --git a/test/Makefile b/test/Makefile
index e103296fabdd..c80ad421a938 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -8,6 +8,7 @@ XCFLAGS =
 override CFLAGS += -Wall -Wextra -Wno-unused-parameter -Wno-sign-compare\
 	-D_GNU_SOURCE -D__SANE_USERSPACE_TYPES__ -L../src/ \
 	-I../src/include/ -include ../config-host.h
+CXXFLAGS += $(CFLAGS) -std=c++11
 
 all_targets += poll poll-cancel ring-leak fsync io_uring_setup io_uring_register \
 	       io_uring_enter nop sq-full cq-full 35fa71a030ca-test \
@@ -36,11 +37,18 @@ ifdef CONFIG_HAVE_STATX
 all_targets += statx
 endif
 
+ifdef CONFIG_HAVE_CXX
+all_targets += sq-full-cpp
+endif
+
 all: $(all_targets)
 
 %: %.c
 	$(QUIET_CC)$(CC) $(CFLAGS) -o $@ $< -luring $(XCFLAGS)
 
+%: %.cc
+	$(QUIET_CC)$(CXX) $(CXXFLAGS) -o $@ $< -luring $(XCFLAGS)
+
 test_srcs := poll.c poll-cancel.c ring-leak.c fsync.c io_uring_setup.c \
 	io_uring_register.c io_uring_enter.c nop.c sq-full.c cq-full.c \
 	35fa71a030ca-test.c 917257daa0fe-test.c b19062a56726-test.c \
@@ -63,6 +71,10 @@ ifdef CONFIG_HAVE_STATX
 test_srcs += statx.c
 endif
 
+ifdef CONFIG_HAVE_CXX
+test_srcs += sq-full-cpp
+endif
+
 test_objs := $(patsubst %.c,%.ol,$(test_srcs))
 
 35fa71a030ca-test: XCFLAGS = -lpthread
diff --git a/test/sq-full-cpp.cc b/test/sq-full-cpp.cc
new file mode 100644
index 000000000000..ba400996e615
--- /dev/null
+++ b/test/sq-full-cpp.cc
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Description: test SQ queue full condition
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "liburing.h"
+
+int main(int argc, char *argv[])
+{
+	struct io_uring_sqe *sqe;
+	struct io_uring ring;
+	int ret, i;
+
+	if (argc > 1)
+		return 0;
+
+	ret = io_uring_queue_init(8, &ring, 0);
+	if (ret) {
+		fprintf(stderr, "ring setup failed: %d\n", ret);
+		return 1;
+
+	}
+
+	i = 0;
+	while ((sqe = io_uring_get_sqe(&ring)) != NULL)
+		i++;
+
+	if (i != 8) {
+		fprintf(stderr, "Got %d SQEs, wanted 8\n", i);
+		goto err;
+	}
+
+	io_uring_queue_exit(&ring);
+	return 0;
+err:
+	io_uring_queue_exit(&ring);
+	return 1;
+}