[20/38] tests: start chardev unit tests

diff --git a/tests/test-char.c b/tests/test-char.c
new file mode 100644
index 0000000..13c55b8
--- /dev/null
+++ b/tests/test-char.c
@@ -0,0 +1,253 @@ 
+#include "qemu/osdep.h"
+
+#include "qemu-common.h"
+#include "qemu/config-file.h"
+#include "sysemu/char.h"
+#include "sysemu/sysemu.h"
+#include "qapi/error.h"
+#include "qmp-commands.h"
+
+typedef struct FeHandler {
+    int read_count;
+    int last_event;
+    char read_buf[128];
+} FeHandler;
+
+static int fe_can_read(void *opaque)
+{
+    FeHandler *h = opaque;
+
+    return sizeof(h->read_buf) - h->read_count;
+}
+
+static void fe_read(void *opaque, const uint8_t *buf, int size)
+{
+    FeHandler *h = opaque;
+
+    g_assert_cmpint(size, <=, fe_can_read(opaque));
+
+    memcpy(h->read_buf + h->read_count, buf, size);
+    h->read_count += size;
+}
+
+static void fe_event(void *opaque, int event)
+{
+    FeHandler *h = opaque;
+
+    h->last_event = event;
+}
+
+#ifdef CONFIG_HAS_GLIB_SUBPROCESS_TESTS
+static void char_stdio_test_subprocess(void)
+{
+    CharDriverState *chr;
+    CharBackend be;
+    int ret;
+
+    chr = qemu_chr_new("label", "stdio");
+    g_assert_nonnull(chr);
+
+    qemu_chr_fe_init(&be, chr, &error_abort);
+    qemu_chr_fe_set_open(&be, true);
+    ret = qemu_chr_fe_write(&be, (void *)"buf", 4);
+    g_assert_cmpint(ret, ==, 4);
+
+    qemu_chr_fe_deinit(&be);
+    qemu_chr_delete(chr);
+}
+
+static void char_stdio_test(void)
+{
+    g_test_trap_subprocess("/char/stdio/subprocess", 0, 0);
+    g_test_trap_assert_passed();
+    g_test_trap_assert_stdout("buf");
+}
+#endif
+
+
+static void char_ringbuf_test(void)
+{
+    QemuOpts *opts;
+    CharDriverState *chr;
+    CharBackend be;
+    char *data;
+    int ret;
+
+    opts = qemu_opts_create(qemu_find_opts("chardev"), "ringbuf-label",
+                            1, &error_abort);
+    qemu_opt_set(opts, "backend", "ringbuf", &error_abort);
+
+    qemu_opt_set(opts, "size", "5", &error_abort);
+    chr = qemu_chr_new_from_opts(opts, NULL);
+    g_assert_null(chr);
+    qemu_opts_del(opts);
+
+    opts = qemu_opts_create(qemu_find_opts("chardev"), "ringbuf-label",
+                            1, &error_abort);
+    qemu_opt_set(opts, "backend", "ringbuf", &error_abort);
+    qemu_opt_set(opts, "size", "2", &error_abort);
+    chr = qemu_chr_new_from_opts(opts, &error_abort);
+    g_assert_nonnull(chr);
+    qemu_opts_del(opts);
+
+    qemu_chr_fe_init(&be, chr, &error_abort);
+    ret = qemu_chr_fe_write(&be, (void *)"buff", 4);
+    g_assert_cmpint(ret, ==, 4);
+
+    data = qmp_ringbuf_read("ringbuf-label", 4, false, 0, &error_abort);
+    g_assert_cmpstr(data, ==, "ff");
+    g_free(data);
+
+    data = qmp_ringbuf_read("ringbuf-label", 4, false, 0, &error_abort);
+    g_assert_cmpstr(data, ==, "");
+    g_free(data);
+
+    qemu_chr_fe_deinit(&be);
+    qemu_chr_delete(chr);
+}
+
+static void char_mux_test(void)
+{
+    QemuOpts *opts;
+    CharDriverState *chr, *base;
+    char *data;
+    FeHandler h1 = { 0, }, h2 = { 0, };
+    CharBackend chr_be1, chr_be2;
+
+    opts = qemu_opts_create(qemu_find_opts("chardev"), "mux-label",
+                            1, &error_abort);
+    qemu_opt_set(opts, "backend", "ringbuf", &error_abort);
+    qemu_opt_set(opts, "size", "128", &error_abort);
+    qemu_opt_set(opts, "mux", "on", &error_abort);
+    chr = qemu_chr_new_from_opts(opts, &error_abort);
+    g_assert_nonnull(chr);
+    qemu_opts_del(opts);
+
+    qemu_chr_fe_init(&chr_be1, chr, &error_abort);
+    qemu_chr_fe_set_handlers(&chr_be1,
+                             fe_can_read,
+                             fe_read,
+                             fe_event,
+                             &h1,
+                             NULL);
+
+    qemu_chr_fe_init(&chr_be2, chr, &error_abort);
+    qemu_chr_fe_set_handlers(&chr_be2,
+                             fe_can_read,
+                             fe_read,
+                             fe_event,
+                             &h2,
+                             NULL);
+    qemu_chr_fe_take_focus(&chr_be2);
+
+    base = qemu_chr_find("mux-label-base");
+    g_assert_cmpint(qemu_chr_be_can_write(base), !=, 0);
+
+    qemu_chr_be_write(base, (void *)"hello", 6);
+    g_assert_cmpint(h1.read_count, ==, 0);
+    g_assert_cmpint(h2.read_count, ==, 6);
+    g_assert_cmpstr(h2.read_buf, ==, "hello");
+    h2.read_count = 0;
+
+    /* switch focus */
+    qemu_chr_be_write(base, (void *)"\1c", 2);
+
+    qemu_chr_be_write(base, (void *)"hello", 6);
+    g_assert_cmpint(h2.read_count, ==, 0);
+    g_assert_cmpint(h1.read_count, ==, 6);
+    g_assert_cmpstr(h1.read_buf, ==, "hello");
+    h1.read_count = 0;
+
+    /* remove first handler */
+    qemu_chr_fe_set_handlers(&chr_be1, NULL, NULL, NULL, NULL, NULL);
+    qemu_chr_be_write(base, (void *)"hello", 6);
+    g_assert_cmpint(h1.read_count, ==, 0);
+    g_assert_cmpint(h2.read_count, ==, 0);
+
+    qemu_chr_be_write(base, (void *)"\1c", 2);
+    qemu_chr_be_write(base, (void *)"hello", 6);
+    g_assert_cmpint(h1.read_count, ==, 0);
+    g_assert_cmpint(h2.read_count, ==, 6);
+    g_assert_cmpstr(h2.read_buf, ==, "hello");
+    h2.read_count = 0;
+
+    /* print help */
+    qemu_chr_be_write(base, (void *)"\1?", 2);
+    data = qmp_ringbuf_read("mux-label-base", 128, false, 0, &error_abort);
+    g_assert_cmpint(strlen(data), !=, 0);
+    g_free(data);
+
+    qemu_chr_fe_deinit(&chr_be1);
+    qemu_chr_fe_deinit(&chr_be2);
+    qemu_chr_delete(chr);
+}
+
+static void char_null_test(void)
+{
+    Error *err = NULL;
+    CharDriverState *chr;
+    CharBackend be;
+    int ret;
+
+    chr = qemu_chr_find("label-null");
+    g_assert_null(chr);
+
+    chr = qemu_chr_new("label-null", "null");
+    chr = qemu_chr_find("label-null");
+    g_assert_nonnull(chr);
+
+    g_assert(qemu_chr_has_feature(chr,
+                 QEMU_CHAR_FEATURE_FD_PASS) == false);
+    g_assert(qemu_chr_has_feature(chr,
+                 QEMU_CHAR_FEATURE_RECONNECTABLE) == false);
+
+    /* check max avail */
+    qemu_chr_fe_init(&be, chr, &error_abort);
+    qemu_chr_fe_init(&be, chr, &err);
+    error_free_or_abort(&err);
+
+    /* deinit & reinit */
+    qemu_chr_fe_deinit(&be);
+    qemu_chr_fe_init(&be, chr, &error_abort);
+
+    qemu_chr_fe_set_open(&be, true);
+
+    qemu_chr_fe_set_handlers(&be,
+                             fe_can_read,
+                             fe_read,
+                             fe_event,
+                             NULL, NULL);
+
+    ret = qemu_chr_fe_write(&be, (void *)"buf", 4);
+    g_assert_cmpint(ret, ==, 4);
+
+    qemu_chr_fe_deinit(&be);
+    qemu_chr_delete(chr);
+}
+
+static void char_invalid_test(void)
+{
+    CharDriverState *chr;
+
+    chr = qemu_chr_new("label-invalid", "invalid");
+    g_assert_null(chr);
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+
+    module_call_init(MODULE_INIT_QOM);
+    qemu_add_opts(&qemu_chardev_opts);
+
+    g_test_add_func("/char/null", char_null_test);
+    g_test_add_func("/char/invalid", char_invalid_test);
+    g_test_add_func("/char/ringbuf", char_ringbuf_test);
+    g_test_add_func("/char/mux", char_mux_test);
+#ifdef CONFIG_HAS_GLIB_SUBPROCESS_TESTS
+    g_test_add_func("/char/stdio/subprocess", char_stdio_test_subprocess);
+    g_test_add_func("/char/stdio", char_stdio_test);
+#endif
+
+    return g_test_run();
+}
diff --git a/tests/Makefile.include b/tests/Makefile.include
index cbe38ad..e65e9f7 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -8,6 +8,8 @@  SYSEMU_TARGET_LIST := $(subst -softmmu.mak,,$(notdir \
 
 check-unit-y = tests/check-qdict$(EXESUF)
 gcov-files-check-qdict-y = qobject/qdict.c
+check-unit-y = tests/test-char$(EXESUF)
+gcov-files-check-qdict-y = qemu-char.c
 check-unit-y += tests/check-qfloat$(EXESUF)
 gcov-files-check-qfloat-y = qobject/qfloat.c
 check-unit-y += tests/check-qint$(EXESUF)
@@ -481,6 +483,8 @@  tests/check-qnull$(EXESUF): tests/check-qnull.o $(test-util-obj-y)
 tests/check-qjson$(EXESUF): tests/check-qjson.o $(test-util-obj-y)
 tests/check-qom-interface$(EXESUF): tests/check-qom-interface.o $(test-qom-obj-y)
 tests/check-qom-proplist$(EXESUF): tests/check-qom-proplist.o $(test-qom-obj-y)
+
+tests/test-char$(EXESUF): tests/test-char.o qemu-char.o qemu-timer.o $(test-util-obj-y) $(qtest-obj-y) $(test-io-obj-y)
 tests/test-coroutine$(EXESUF): tests/test-coroutine.o $(test-block-obj-y)
 tests/test-aio$(EXESUF): tests/test-aio.o $(test-block-obj-y)
 tests/test-rfifolock$(EXESUF): tests/test-rfifolock.o $(test-util-obj-y)