tests/qtest/libqtest.c

/*
 * QTest
 *
 * Copyright IBM, Corp. 2012
 * Copyright Red Hat, Inc. 2012
 * Copyright SUSE LINUX Products GmbH 2013
 *
 * Authors:
 *  Anthony Liguori   <aliguori@us.ibm.com>
 *  Paolo Bonzini     <pbonzini@redhat.com>
 *  Andreas Färber    <afaerber@suse.de>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#include "qemu/osdep.h"

#ifndef _WIN32
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/un.h>
#endif /* _WIN32 */
#ifdef __linux__
#include <sys/prctl.h>
#endif /* __linux__ */
#ifdef __FreeBSD__
#include <sys/procctl.h>
#endif /* __FreeBSD__ */

#include "libqtest.h"
#include "libqmp.h"
#include "qemu/ctype.h"
#include "qemu/cutils.h"
#include "qemu/sockets.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qjson.h"
#include "qapi/qmp/qlist.h"
#include "qapi/qmp/qstring.h"

#define MAX_IRQ 256

#ifndef _WIN32
# define SOCKET_TIMEOUT 50
# define CMD_EXEC   "exec "
# define DEV_STDERR "/dev/fd/2"
# define DEV_NULL   "/dev/null"
#else
# define SOCKET_TIMEOUT 50000
# define CMD_EXEC   ""
# define DEV_STDERR "2"
# define DEV_NULL   "nul"
#endif

#define WAITPID_TIMEOUT 30

typedef void (*QTestSendFn)(QTestState *s, const char *buf);
typedef void (*ExternalSendFn)(void *s, const char *buf);
typedef GString* (*QTestRecvFn)(QTestState *);

typedef struct QTestClientTransportOps {
    QTestSendFn     send;      /* for sending qtest commands */

    /*
     * use external_send to send qtest command strings through functions which
     * do not accept a QTestState as the first parameter.
     */
    ExternalSendFn  external_send;

    QTestRecvFn     recv_line; /* for receiving qtest command responses */
} QTestTransportOps;

struct QTestState
{
    int fd;
    int qmp_fd;
    pid_t qemu_pid;  /* our child QEMU process */
    int wstatus;
#ifdef _WIN32
    DWORD exit_code;
#endif
    int expected_status;
    bool big_endian;
    bool irq_level[MAX_IRQ];
    GString *rx;
    QTestTransportOps ops;
    GList *pending_events;
    QTestQMPEventCallback eventCB;
    void *eventData;
};

static GHookList abrt_hooks;
static void (*sighandler_old)(int);

static int qtest_query_target_endianness(QTestState *s);

static void qtest_client_socket_send(QTestState*, const char *buf);
static void socket_send(int fd, const char *buf, size_t size);

static GString *qtest_client_socket_recv_line(QTestState *);

static void qtest_client_set_tx_handler(QTestState *s, QTestSendFn send);
static void qtest_client_set_rx_handler(QTestState *s, QTestRecvFn recv);

static int init_socket(const char *socket_path)
{
    int sock = qtest_socket_server(socket_path);
    qemu_set_cloexec(sock);
    return sock;
}

static int socket_accept(int sock)
{
    struct sockaddr_un addr;
    socklen_t addrlen;
    int ret;
    /*
     * timeout unit of blocking receive calls is different among platforms.
     * It's in seconds on non-Windows platforms but milliseconds on Windows.
     */
#ifndef _WIN32
    struct timeval timeout = { .tv_sec = SOCKET_TIMEOUT,
                               .tv_usec = 0 };
#else
    DWORD timeout = SOCKET_TIMEOUT;
#endif

    if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
                   (void *)&timeout, sizeof(timeout))) {
        fprintf(stderr, "%s failed to set SO_RCVTIMEO: %s\n",
                __func__, strerror(errno));
        close(sock);
        return -1;
    }

    do {
        addrlen = sizeof(addr);
        ret = accept(sock, (struct sockaddr *)&addr, &addrlen);
    } while (ret == -1 && errno == EINTR);
    if (ret == -1) {
        fprintf(stderr, "%s failed: %s\n", __func__, strerror(errno));
    }
    close(sock);

    return ret;
}

pid_t qtest_pid(QTestState *s)
{
    return s->qemu_pid;
}

bool qtest_probe_child(QTestState *s)
{
    pid_t pid = s->qemu_pid;

    if (pid != -1) {
#ifndef _WIN32
        pid = waitpid(pid, &s->wstatus, WNOHANG);
        if (pid == 0) {
            return true;
        }
#else
        GetExitCodeProcess((HANDLE)pid, &s->exit_code);
        if (s->exit_code == STILL_ACTIVE) {
            return true;
        }
        CloseHandle((HANDLE)pid);
#endif
        s->qemu_pid = -1;
        qtest_remove_abrt_handler(s);
    }
    return false;
}

void qtest_set_expected_status(QTestState *s, int status)
{
    s->expected_status = status;
}

static void qtest_check_status(QTestState *s)
{
    assert(s->qemu_pid == -1);

    /*
     * Check whether qemu exited with expected exit status; anything else is
     * fishy and should be logged with as much detail as possible.
     */
#ifndef _WIN32
    int wstatus = s->wstatus;
    if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) != s->expected_status) {
        fprintf(stderr, "%s:%d: kill_qemu() tried to terminate QEMU "
                "process but encountered exit status %d (expected %d)\n",
                __FILE__, __LINE__, WEXITSTATUS(wstatus), s->expected_status);
        abort();
    } else if (WIFSIGNALED(wstatus)) {
        int sig = WTERMSIG(wstatus);
        const char *signame = strsignal(sig) ?: "unknown ???";
        const char *dump = WCOREDUMP(wstatus) ? " (core dumped)" : "";

        fprintf(stderr, "%s:%d: kill_qemu() detected QEMU death "
                "from signal %d (%s)%s\n",
                __FILE__, __LINE__, sig, signame, dump);
        abort();
    }
#else
    if (s->exit_code != s->expected_status) {
        fprintf(stderr, "%s:%d: kill_qemu() tried to terminate QEMU "
                "process but encountered exit status %ld (expected %d)\n",
                __FILE__, __LINE__, s->exit_code, s->expected_status);
        abort();
    }
#endif
}

void qtest_wait_qemu(QTestState *s)
{
    if (s->qemu_pid != -1) {
#ifndef _WIN32
        pid_t pid;
        uint64_t end;

        /* poll for a while until sending SIGKILL */
        end = g_get_monotonic_time() + WAITPID_TIMEOUT * G_TIME_SPAN_SECOND;

        do {
            pid = waitpid(s->qemu_pid, &s->wstatus, WNOHANG);
            if (pid != 0) {
                break;
            }
            g_usleep(100 * 1000);
        } while (g_get_monotonic_time() < end);

        if (pid == 0) {
            kill(s->qemu_pid, SIGKILL);
            pid = RETRY_ON_EINTR(waitpid(s->qemu_pid, &s->wstatus, 0));
        }

        assert(pid == s->qemu_pid);
#else
        DWORD ret;

        ret = WaitForSingleObject((HANDLE)s->qemu_pid, INFINITE);
        assert(ret == WAIT_OBJECT_0);
        GetExitCodeProcess((HANDLE)s->qemu_pid, &s->exit_code);
        CloseHandle((HANDLE)s->qemu_pid);
#endif

        s->qemu_pid = -1;
        qtest_remove_abrt_handler(s);
    }
    qtest_check_status(s);
}

void qtest_kill_qemu(QTestState *s)
{
    /* Skip wait if qtest_probe_child() already reaped */
    if (s->qemu_pid != -1) {
#ifndef _WIN32
        kill(s->qemu_pid, SIGTERM);
#else
        TerminateProcess((HANDLE)s->qemu_pid, s->expected_status);
#endif
        qtest_wait_qemu(s);
        return;
    }

    qtest_check_status(s);
}

static void kill_qemu_hook_func(void *s)
{
    qtest_kill_qemu(s);
}

static void sigabrt_handler(int signo)
{
    g_hook_list_invoke(&abrt_hooks, FALSE);
}

static void setup_sigabrt_handler(void)
{
    sighandler_old = signal(SIGABRT, sigabrt_handler);
}

static void cleanup_sigabrt_handler(void)
{
    signal(SIGABRT, sighandler_old);
}

static bool hook_list_is_empty(GHookList *hook_list)
{
    GHook *hook = g_hook_first_valid(hook_list, TRUE);

    if (!hook) {
        return true;
    }

    g_hook_unref(hook_list, hook);
    return false;
}

void qtest_add_abrt_handler(GHookFunc fn, const void *data)
{
    GHook *hook;

    if (!abrt_hooks.is_setup) {
        g_hook_list_init(&abrt_hooks, sizeof(GHook));
    }

    /* Only install SIGABRT handler once */
    if (hook_list_is_empty(&abrt_hooks)) {
        setup_sigabrt_handler();
    }

    hook = g_hook_alloc(&abrt_hooks);
    hook->func = fn;
    hook->data = (void *)data;

    g_hook_prepend(&abrt_hooks, hook);
}

void qtest_remove_abrt_handler(void *data)
{
    GHook *hook = g_hook_find_data(&abrt_hooks, TRUE, data);

    if (!hook) {
        return;
    }

    g_hook_destroy_link(&abrt_hooks, hook);

    /* Uninstall SIGABRT handler on last instance */
    if (hook_list_is_empty(&abrt_hooks)) {
        cleanup_sigabrt_handler();
    }
}

static const char *qtest_qemu_binary(void)
{
    const char *qemu_bin;

    qemu_bin = getenv("QTEST_QEMU_BINARY");
    if (!qemu_bin) {
        fprintf(stderr, "Environment variable QTEST_QEMU_BINARY required\n");
        exit(1);
    }

    return qemu_bin;
}

#ifdef _WIN32
static pid_t qtest_create_process(char *cmd)
{
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    BOOL ret;

    ZeroMemory(&si, sizeof(si));
    si.cb = sizeof(si);
    ZeroMemory(&pi, sizeof(pi));

    ret = CreateProcess(NULL,   /* module name */
                        cmd,    /* command line */
                        NULL,   /* process handle not inheritable */
                        NULL,   /* thread handle not inheritable */
                        FALSE,  /* set handle inheritance to FALSE */
                        0,      /* No creation flags */
                        NULL,   /* use parent's environment block */
                        NULL,   /* use parent's starting directory */
                        &si,    /* pointer to STARTUPINFO structure */
                        &pi     /* pointer to PROCESS_INFORMATION structure */
                        );
    if (ret == 0) {
        fprintf(stderr, "%s:%d: unable to create a new process (%s)\n",
                __FILE__, __LINE__, strerror(GetLastError()));
        abort();
    }

    return (pid_t)pi.hProcess;
}
#endif /* _WIN32 */

static QTestState *G_GNUC_PRINTF(1, 2) qtest_spawn_qemu(const char *fmt, ...)
{
    va_list ap;
    QTestState *s = g_new0(QTestState, 1);
    const char *trace = g_getenv("QTEST_TRACE");
    g_autofree char *tracearg = trace ?
        g_strdup_printf("-trace %s ", trace) : g_strdup("");
    g_autoptr(GString) command = g_string_new("");

    va_start(ap, fmt);
    g_string_append_printf(command, CMD_EXEC "%s %s",
                           qtest_qemu_binary(), tracearg);
    g_string_append_vprintf(command, fmt, ap);
    va_end(ap);

    qtest_add_abrt_handler(kill_qemu_hook_func, s);

    g_test_message("starting QEMU: %s", command->str);

#ifndef _WIN32
    s->qemu_pid = fork();
    if (s->qemu_pid == 0) {
#ifdef __linux__
        /*
         * Although we register a ABRT handler to kill off QEMU
         * when g_assert() triggers, we want an extra safety
         * net. The QEMU process might be non-functional and
         * thus not have responded to SIGTERM. The test script
         * might also have crashed with SEGV, in which case the
         * cleanup handlers won't ever run.
         *
         * This PR_SET_PDEATHSIG setup will ensure any remaining
         * QEMU will get terminated with SIGKILL in these cases.
         */
        prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
#endif /* __linux__ */
#ifdef __FreeBSD__
        int sig = SIGKILL;
        procctl(P_PID, getpid(), PROC_PDEATHSIG_CTL, &sig);
#endif /* __FreeBSD__ */
        execlp("/bin/sh", "sh", "-c", command->str, NULL);
        exit(1);
    }
#else
    s->qemu_pid = qtest_create_process(command->str);
#endif /* _WIN32 */

    return s;
}

QTestState *qtest_init_without_qmp_handshake(const char *extra_args)
{
    QTestState *s;
    int sock, qmpsock, i;
    gchar *socket_path;
    gchar *qmp_socket_path;

    socket_path = g_strdup_printf("%s/qtest-%d.sock",
                                  g_get_tmp_dir(), getpid());
    qmp_socket_path = g_strdup_printf("%s/qtest-%d.qmp",
                                      g_get_tmp_dir(), getpid());

    /*
     * It's possible that if an earlier test run crashed it might
     * have left a stale unix socket lying around. Delete any
     * stale old socket to avoid spurious test failures with
     * tests/libqtest.c:70:init_socket: assertion failed (ret != -1): (-1 != -1)
     */
    unlink(socket_path);
    unlink(qmp_socket_path);

    socket_init();
    sock = init_socket(socket_path);
    qmpsock = init_socket(qmp_socket_path);

    s = qtest_spawn_qemu("-qtest unix:%s "
                         "-qtest-log %s "
                         "-chardev socket,path=%s,id=char0 "
                         "-mon chardev=char0,mode=control "
                         "-display none "
                         "-audio none "
                         "%s"
                         " -accel qtest",
                         socket_path,
                         getenv("QTEST_LOG") ? DEV_STDERR : DEV_NULL,
                         qmp_socket_path,
                         extra_args ?: "");

    qtest_client_set_rx_handler(s, qtest_client_socket_recv_line);
    qtest_client_set_tx_handler(s, qtest_client_socket_send);

    s->fd = socket_accept(sock);
    if (s->fd >= 0) {
        s->qmp_fd = socket_accept(qmpsock);
    }
    unlink(socket_path);
    unlink(qmp_socket_path);
    g_free(socket_path);
    g_free(qmp_socket_path);

    g_assert(s->fd >= 0 && s->qmp_fd >= 0);

    s->rx = g_string_new("");
    for (i = 0; i < MAX_IRQ; i++) {
        s->irq_level[i] = false;
    }

    /*
     * Stopping QEMU for debugging is not supported on Windows.
     *
     * Using DebugActiveProcess() API can suspend the QEMU process,
     * but gdb cannot attach to the process. Using the undocumented
     * NtSuspendProcess() can suspend the QEMU process and gdb can
     * attach to the process, but gdb cannot resume it.
     */
#ifndef _WIN32
    if (getenv("QTEST_STOP")) {
        kill(s->qemu_pid, SIGSTOP);
    }
#endif

    /* ask endianness of the target */

    s->big_endian = qtest_query_target_endianness(s);

    return s;
}

QTestState *qtest_init(const char *extra_args)
{
    QTestState *s = qtest_init_without_qmp_handshake(extra_args);
    QDict *greeting;

    /* Read the QMP greeting and then do the handshake */
    greeting = qtest_qmp_receive(s);
    qobject_unref(greeting);
    qobject_unref(qtest_qmp(s, "{ 'execute': 'qmp_capabilities' }"));

    return s;
}

QTestState *qtest_vinitf(const char *fmt, va_list ap)
{
    char *args = g_strdup_vprintf(fmt, ap);
    QTestState *s;

    s = qtest_init(args);
    g_free(args);
    return s;
}

QTestState *qtest_initf(const char *fmt, ...)
{
    va_list ap;
    QTestState *s;

    va_start(ap, fmt);
    s = qtest_vinitf(fmt, ap);
    va_end(ap);
    return s;
}

QTestState *qtest_init_with_serial(const char *extra_args, int *sock_fd)
{
    int sock_fd_init;
    g_autofree char *sock_dir = NULL;
    char *sock_path;
    QTestState *qts;

    sock_dir = g_dir_make_tmp("qtest-serial-XXXXXX", NULL);
    g_assert_true(sock_dir != NULL);
    sock_path = g_strdup_printf("%s/sock", sock_dir);

    socket_init();
    sock_fd_init = init_socket(sock_path);

    qts = qtest_initf("-chardev socket,id=s0,path=%s -serial chardev:s0 %s",
                      sock_path, extra_args);

    *sock_fd = socket_accept(sock_fd_init);

    unlink(sock_path);
    g_free(sock_path);
    rmdir(sock_dir);

    g_assert_true(*sock_fd >= 0);

    return qts;
}

void qtest_quit(QTestState *s)
{
    qtest_remove_abrt_handler(s);

    qtest_kill_qemu(s);
    close(s->fd);
    close(s->qmp_fd);
    g_string_free(s->rx, true);

    for (GList *it = s->pending_events; it != NULL; it = it->next) {
        qobject_unref((QDict *)it->data);
    }

    g_list_free(s->pending_events);

    g_free(s);
}

static void socket_send(int fd, const char *buf, size_t size)
{
    ssize_t res = qemu_send_full(fd, buf, size);

    assert(res == size);
}

static void qtest_client_socket_send(QTestState *s, const char *buf)
{
    socket_send(s->fd, buf, strlen(buf));
}

static void G_GNUC_PRINTF(2, 3) qtest_sendf(QTestState *s, const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    gchar *str = g_strdup_vprintf(fmt, ap);
    va_end(ap);

    s->ops.send(s, str);
    g_free(str);
}

static GString *qtest_client_socket_recv_line(QTestState *s)
{
    GString *line;
    size_t offset;
    char *eol;

    while ((eol = strchr(s->rx->str, '\n')) == NULL) {
        ssize_t len;
        char buffer[1024];

        len = recv(s->fd, buffer, sizeof(buffer), 0);
        if (len == -1 && errno == EINTR) {
            continue;
        }

        if (len == -1 || len == 0) {
            fprintf(stderr, "Broken pipe\n");
            abort();
        }

        g_string_append_len(s->rx, buffer, len);
    }

    offset = eol - s->rx->str;
    line = g_string_new_len(s->rx->str, offset);
    g_string_erase(s->rx, 0, offset + 1);

    return line;
}

static gchar **qtest_rsp_args(QTestState *s, int expected_args)
{
    GString *line;
    gchar **words;
    int i;

redo:
    line = s->ops.recv_line(s);
    words = g_strsplit(line->str, " ", 0);
    g_string_free(line, TRUE);

    if (strcmp(words[0], "IRQ") == 0) {
        long irq;
        int ret;

        g_assert(words[1] != NULL);
        g_assert(words[2] != NULL);

        ret = qemu_strtol(words[2], NULL, 0, &irq);
        g_assert(!ret);
        g_assert_cmpint(irq, >=, 0);
        g_assert_cmpint(irq, <, MAX_IRQ);

        if (strcmp(words[1], "raise") == 0) {
            s->irq_level[irq] = true;
        } else {
            s->irq_level[irq] = false;
        }

        g_strfreev(words);
        goto redo;
    }

    g_assert(words[0] != NULL);
    g_assert_cmpstr(words[0], ==, "OK");

    for (i = 0; i < expected_args; i++) {
        g_assert(words[i] != NULL);
    }

    return words;
}

static void qtest_rsp(QTestState *s)
{
    gchar **words = qtest_rsp_args(s, 0);

    g_strfreev(words);
}

static int qtest_query_target_endianness(QTestState *s)
{
    gchar **args;
    int big_endian;

    qtest_sendf(s, "endianness\n");
    args = qtest_rsp_args(s, 1);
    g_assert(strcmp(args[1], "big") == 0 || strcmp(args[1], "little") == 0);
    big_endian = strcmp(args[1], "big") == 0;
    g_strfreev(args);

    return big_endian;
}

QDict *qtest_qmp_receive(QTestState *s)
{
    while (true) {
        QDict *response = qtest_qmp_receive_dict(s);

        if (!qdict_get_try_str(response, "event")) {
            return response;
        }

        if (!s->eventCB ||
            !s->eventCB(s, qdict_get_str(response, "event"),
                        response, s->eventData)) {
            /* Stash the event for a later consumption */
            s->pending_events = g_list_append(s->pending_events, response);
        }
    }
}

QDict *qtest_qmp_receive_dict(QTestState *s)
{
    return qmp_fd_receive(s->qmp_fd);
}

int qtest_socket_server(const char *socket_path)
{
    struct sockaddr_un addr;
    int sock;
    int ret;

    sock = socket(PF_UNIX, SOCK_STREAM, 0);
    g_assert_cmpint(sock, !=, -1);

    addr.sun_family = AF_UNIX;
    snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", socket_path);

    ret = RETRY_ON_EINTR(bind(sock, (struct sockaddr *)&addr, sizeof(addr)));
    g_assert_cmpint(ret, !=, -1);
    ret = listen(sock, 1);
    g_assert_cmpint(ret, !=, -1);

    return sock;
}

#ifndef _WIN32
void qtest_qmp_vsend_fds(QTestState *s, int *fds, size_t fds_num,
                         const char *fmt, va_list ap)
{
    qmp_fd_vsend_fds(s->qmp_fd, fds, fds_num, fmt, ap);
}
#endif

void qtest_qmp_vsend(QTestState *s, const char *fmt, va_list ap)
{
    qmp_fd_vsend(s->qmp_fd, fmt, ap);
}

#ifndef _WIN32
QDict *qtest_vqmp_fds(QTestState *s, int *fds, size_t fds_num,
                      const char *fmt, va_list ap)
{
    qtest_qmp_vsend_fds(s, fds, fds_num, fmt, ap);

    /* Receive reply */
    return qtest_qmp_receive(s);
}
#endif

QDict *qtest_vqmp(QTestState *s, const char *fmt, va_list ap)
{
    qtest_qmp_vsend(s, fmt, ap);

    /* Receive reply */
    return qtest_qmp_receive(s);
}

#ifndef _WIN32
QDict *qtest_qmp_fds(QTestState *s, int *fds, size_t fds_num,
                     const char *fmt, ...)
{
    va_list ap;
    QDict *response;

    va_start(ap, fmt);
    response = qtest_vqmp_fds(s, fds, fds_num, fmt, ap);
    va_end(ap);
    return response;
}
#endif

QDict *qtest_qmp(QTestState *s, const char *fmt, ...)
{
    va_list ap;
    QDict *response;

    va_start(ap, fmt);
    response = qtest_vqmp(s, fmt, ap);
    va_end(ap);
    return response;
}

void qtest_qmp_send(QTestState *s, const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    qtest_qmp_vsend(s, fmt, ap);
    va_end(ap);
}

void qtest_qmp_send_raw(QTestState *s, const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    qmp_fd_vsend_raw(s->qmp_fd, fmt, ap);
    va_end(ap);
}

void qtest_qmp_set_event_callback(QTestState *s,
                                  QTestQMPEventCallback cb, void *opaque)
{
    s->eventCB = cb;
    s->eventData = opaque;
}

QDict *qtest_qmp_event_ref(QTestState *s, const char *event)
{
    while (s->pending_events) {

        GList *first = s->pending_events;
        QDict *response = (QDict *)first->data;

        s->pending_events = g_list_delete_link(s->pending_events, first);

        if (!strcmp(qdict_get_str(response, "event"), event)) {
            return response;
        }
        qobject_unref(response);
    }
    return NULL;
}

QDict *qtest_qmp_eventwait_ref(QTestState *s, const char *event)
{
    QDict *response = qtest_qmp_event_ref(s, event);

    if (response) {
        return response;
    }

    for (;;) {
        response = qtest_qmp_receive_dict(s);
        if ((qdict_haskey(response, "event")) &&
            (strcmp(qdict_get_str(response, "event"), event) == 0)) {
            return response;
        }
        qobject_unref(response);
    }
}

void qtest_qmp_eventwait(QTestState *s, const char *event)
{
    QDict *response;

    response = qtest_qmp_eventwait_ref(s, event);
    qobject_unref(response);
}

char *qtest_vhmp(QTestState *s, const char *fmt, va_list ap)
{
    char *cmd;
    QDict *resp;
    char *ret;

    cmd = g_strdup_vprintf(fmt, ap);
    resp = qtest_qmp(s, "{'execute': 'human-monitor-command',"
                     " 'arguments': {'command-line': %s}}",
                     cmd);
    ret = g_strdup(qdict_get_try_str(resp, "return"));
    g_assert(ret);
    qobject_unref(resp);
    g_free(cmd);
    return ret;
}

char *qtest_hmp(QTestState *s, const char *fmt, ...)
{
    va_list ap;
    char *ret;

    va_start(ap, fmt);
    ret = qtest_vhmp(s, fmt, ap);
    va_end(ap);
    return ret;
}

const char *qtest_get_arch(void)
{
    const char *qemu = qtest_qemu_binary();
    const char *end = strrchr(qemu, '-');

    if (!end) {
        fprintf(stderr, "Can't determine architecture from binary name.\n");
        exit(1);
    }

    if (!strstr(qemu, "-system-")) {
        fprintf(stderr, "QTEST_QEMU_BINARY must end with *-system-<arch> "
                "where 'arch' is the target\narchitecture (x86_64, aarch64, "
                "etc).\n");
        exit(1);
    }

    return end + 1;
}

bool qtest_has_accel(const char *accel_name)
{
    if (g_str_equal(accel_name, "tcg")) {
#if defined(CONFIG_TCG)
        return true;
#else
        return false;
#endif
    } else if (g_str_equal(accel_name, "kvm")) {
        int i;
        const char *arch = qtest_get_arch();
        const char *targets[] = { CONFIG_KVM_TARGETS };

        for (i = 0; i < ARRAY_SIZE(targets); i++) {
            if (!strncmp(targets[i], arch, strlen(arch))) {
                if (!access("/dev/kvm", R_OK | W_OK)) {
                    return true;
                }
            }
        }
    } else {
        /* not implemented */
        g_assert_not_reached();
    }
    return false;
}

bool qtest_get_irq(QTestState *s, int num)
{
    /* dummy operation in order to make sure irq is up to date */
    qtest_inb(s, 0);

    return s->irq_level[num];
}

void qtest_module_load(QTestState *s, const char *prefix, const char *libname)
{
    qtest_sendf(s, "module_load %s %s\n", prefix, libname);
    qtest_rsp(s);
}

static int64_t qtest_clock_rsp(QTestState *s)
{
    gchar **words;
    int64_t clock;
    words = qtest_rsp_args(s, 2);
    clock = g_ascii_strtoll(words[1], NULL, 0);
    g_strfreev(words);
    return clock;
}

int64_t qtest_clock_step_next(QTestState *s)
{
    qtest_sendf(s, "clock_step\n");
    return qtest_clock_rsp(s);
}

int64_t qtest_clock_step(QTestState *s, int64_t step)
{
    qtest_sendf(s, "clock_step %"PRIi64"\n", step);
    return qtest_clock_rsp(s);
}

int64_t qtest_clock_set(QTestState *s, int64_t val)
{
    qtest_sendf(s, "clock_set %"PRIi64"\n", val);
    return qtest_clock_rsp(s);
}

void qtest_irq_intercept_out(QTestState *s, const char *qom_path)
{
    qtest_sendf(s, "irq_intercept_out %s\n", qom_path);
    qtest_rsp(s);
}

void qtest_irq_intercept_out_named(QTestState *s, const char *qom_path, const char *name)
{
    qtest_sendf(s, "irq_intercept_out %s %s\n", qom_path, name);
    qtest_rsp(s);
}

void qtest_irq_intercept_in(QTestState *s, const char *qom_path)
{
    qtest_sendf(s, "irq_intercept_in %s\n", qom_path);
    qtest_rsp(s);
}

void qtest_set_irq_in(QTestState *s, const char *qom_path, const char *name,
                      int num, int level)
{
    if (!name) {
        name = "unnamed-gpio-in";
    }
    qtest_sendf(s, "set_irq_in %s %s %d %d\n", qom_path, name, num, level);
    qtest_rsp(s);
}

static void qtest_out(QTestState *s, const char *cmd, uint16_t addr, uint32_t value)
{
    qtest_sendf(s, "%s 0x%x 0x%x\n", cmd, addr, value);
    qtest_rsp(s);
}

void qtest_outb(QTestState *s, uint16_t addr, uint8_t value)
{
    qtest_out(s, "outb", addr, value);
}

void qtest_outw(QTestState *s, uint16_t addr, uint16_t value)
{
    qtest_out(s, "outw", addr, value);
}

void qtest_outl(QTestState *s, uint16_t addr, uint32_t value)
{
    qtest_out(s, "outl", addr, value);
}

static uint32_t qtest_in(QTestState *s, const char *cmd, uint16_t addr)
{
    gchar **args;
    int ret;
    unsigned long value;

    qtest_sendf(s, "%s 0x%x\n", cmd, addr);
    args = qtest_rsp_args(s, 2);
    ret = qemu_strtoul(args[1], NULL, 0, &value);
    g_assert(!ret && value <= UINT32_MAX);
    g_strfreev(args);

    return value;
}

uint8_t qtest_inb(QTestState *s, uint16_t addr)
{
    return qtest_in(s, "inb", addr);
}

uint16_t qtest_inw(QTestState *s, uint16_t addr)
{
    return qtest_in(s, "inw", addr);
}

uint32_t qtest_inl(QTestState *s, uint16_t addr)
{
    return qtest_in(s, "inl", addr);
}

static void qtest_write(QTestState *s, const char *cmd, uint64_t addr,
                        uint64_t value)
{
    qtest_sendf(s, "%s 0x%" PRIx64 " 0x%" PRIx64 "\n", cmd, addr, value);
    qtest_rsp(s);
}

void qtest_writeb(QTestState *s, uint64_t addr, uint8_t value)
{
    qtest_write(s, "writeb", addr, value);
}

void qtest_writew(QTestState *s, uint64_t addr, uint16_t value)
{
    qtest_write(s, "writew", addr, value);
}

void qtest_writel(QTestState *s, uint64_t addr, uint32_t value)
{
    qtest_write(s, "writel", addr, value);
}

void qtest_writeq(QTestState *s, uint64_t addr, uint64_t value)
{
    qtest_write(s, "writeq", addr, value);
}

static uint64_t qtest_read(QTestState *s, const char *cmd, uint64_t addr)
{
    gchar **args;
    int ret;
    uint64_t value;

    qtest_sendf(s, "%s 0x%" PRIx64 "\n", cmd, addr);
    args = qtest_rsp_args(s, 2);
    ret = qemu_strtou64(args[1], NULL, 0, &value);
    g_assert(!ret);
    g_strfreev(args);

    return value;
}

uint8_t qtest_readb(QTestState *s, uint64_t addr)
{
    return qtest_read(s, "readb", addr);
}

uint16_t qtest_readw(QTestState *s, uint64_t addr)
{
    return qtest_read(s, "readw", addr);
}

uint32_t qtest_readl(QTestState *s, uint64_t addr)
{
    return qtest_read(s, "readl", addr);
}

uint64_t qtest_readq(QTestState *s, uint64_t addr)
{
    return qtest_read(s, "readq", addr);
}

static int hex2nib(char ch)
{
    if (ch >= '0' && ch <= '9') {
        return ch - '0';
    } else if (ch >= 'a' && ch <= 'f') {
        return 10 + (ch - 'a');
    } else if (ch >= 'A' && ch <= 'F') {
        return 10 + (ch - 'a');
    } else {
        return -1;
    }
}

void qtest_memread(QTestState *s, uint64_t addr, void *data, size_t size)
{
    uint8_t *ptr = data;
    gchar **args;
    size_t i;

    if (!size) {
        return;
    }

    qtest_sendf(s, "read 0x%" PRIx64 " 0x%zx\n", addr, size);
    args = qtest_rsp_args(s, 2);

    for (i = 0; i < size; i++) {
        ptr[i] = hex2nib(args[1][2 + (i * 2)]) << 4;
        ptr[i] |= hex2nib(args[1][2 + (i * 2) + 1]);
    }

    g_strfreev(args);
}

uint64_t qtest_rtas_call(QTestState *s, const char *name,
                         uint32_t nargs, uint64_t args,
                         uint32_t nret, uint64_t ret)
{
    qtest_sendf(s, "rtas %s %u 0x%"PRIx64" %u 0x%"PRIx64"\n",
                name, nargs, args, nret, ret);
    qtest_rsp(s);
    return 0;
}

void qtest_add_func(const char *str, void (*fn)(void))
{
    gchar *path = g_strdup_printf("/%s/%s", qtest_get_arch(), str);
    g_test_add_func(path, fn);
    g_free(path);
}

void qtest_add_data_func_full(const char *str, void *data,
                              void (*fn)(const void *),
                              GDestroyNotify data_free_func)
{
    gchar *path = g_strdup_printf("/%s/%s", qtest_get_arch(), str);
    g_test_add_data_func_full(path, data, fn, data_free_func);
    g_free(path);
}

void qtest_add_data_func(const char *str, const void *data,
                         void (*fn)(const void *))
{
    gchar *path = g_strdup_printf("/%s/%s", qtest_get_arch(), str);
    g_test_add_data_func(path, data, fn);
    g_free(path);
}

void qtest_bufwrite(QTestState *s, uint64_t addr, const void *data, size_t size)
{
    gchar *bdata;

    bdata = g_base64_encode(data, size);
    qtest_sendf(s, "b64write 0x%" PRIx64 " 0x%zx ", addr, size);
    s->ops.send(s, bdata);
    s->ops.send(s, "\n");
    qtest_rsp(s);
    g_free(bdata);
}

void qtest_bufread(QTestState *s, uint64_t addr, void *data, size_t size)
{
    gchar **args;
    size_t len;

    qtest_sendf(s, "b64read 0x%" PRIx64 " 0x%zx\n", addr, size);
    args = qtest_rsp_args(s, 2);

    g_base64_decode_inplace(args[1], &len);
    if (size != len) {
        fprintf(stderr, "bufread: asked for %zu bytes but decoded %zu\n",
                size, len);
        len = MIN(len, size);
    }

    memcpy(data, args[1], len);
    g_strfreev(args);
}

void qtest_memwrite(QTestState *s, uint64_t addr, const void *data, size_t size)
{
    const uint8_t *ptr = data;
    size_t i;
    char *enc;

    if (!size) {
        return;
    }

    enc = g_malloc(2 * size + 1);

    for (i = 0; i < size; i++) {
        sprintf(&enc[i * 2], "%02x", ptr[i]);
    }

    qtest_sendf(s, "write 0x%" PRIx64 " 0x%zx 0x%s\n", addr, size, enc);
    qtest_rsp(s);
    g_free(enc);
}

void qtest_memset(QTestState *s, uint64_t addr, uint8_t pattern, size_t size)
{
    qtest_sendf(s, "memset 0x%" PRIx64 " 0x%zx 0x%02x\n", addr, size, pattern);
    qtest_rsp(s);
}

QDict *qtest_vqmp_assert_success_ref(QTestState *qts,
                                     const char *fmt, va_list args)
{
    QDict *response;
    QDict *ret;

    response = qtest_vqmp(qts, fmt, args);

    g_assert(response);
    if (!qdict_haskey(response, "return")) {
        g_autoptr(GString) s = qobject_to_json_pretty(QOBJECT(response), true);
        g_test_message("%s", s->str);
    }
    g_assert(qdict_haskey(response, "return"));
    ret = qdict_get_qdict(response, "return");
    qobject_ref(ret);
    qobject_unref(response);

    return ret;
}

void qtest_vqmp_assert_success(QTestState *qts,
                               const char *fmt, va_list args)
{
    QDict *response;

    response = qtest_vqmp_assert_success_ref(qts, fmt, args);

    qobject_unref(response);
}

#ifndef _WIN32
QDict *qtest_vqmp_fds_assert_success_ref(QTestState *qts, int *fds, size_t nfds,
                                         const char *fmt, va_list args)
{
    QDict *response;
    QDict *ret;

    response = qtest_vqmp_fds(qts, fds, nfds, fmt, args);

    g_assert(response);
    if (!qdict_haskey(response, "return")) {
        g_autoptr(GString) s = qobject_to_json_pretty(QOBJECT(response), true);
        g_test_message("%s", s->str);
    }
    g_assert(qdict_haskey(response, "return"));
    ret = qdict_get_qdict(response, "return");
    qobject_ref(ret);
    qobject_unref(response);

    return ret;
}

void qtest_vqmp_fds_assert_success(QTestState *qts, int *fds, size_t nfds,
                                   const char *fmt, va_list args)
{
    QDict *response;
    response = qtest_vqmp_fds_assert_success_ref(qts, fds, nfds, fmt, args);
    qobject_unref(response);
}
#endif /* !_WIN32 */

QDict *qtest_qmp_assert_success_ref(QTestState *qts, const char *fmt, ...)
{
    QDict *response;
    va_list ap;
    va_start(ap, fmt);
    response = qtest_vqmp_assert_success_ref(qts, fmt, ap);
    va_end(ap);
    return response;
}

void qtest_qmp_assert_success(QTestState *qts, const char *fmt, ...)
{
    va_list ap;
    va_start(ap, fmt);
    qtest_vqmp_assert_success(qts, fmt, ap);
    va_end(ap);
}

#ifndef _WIN32
QDict *qtest_qmp_fds_assert_success_ref(QTestState *qts, int *fds, size_t nfds,
                                        const char *fmt, ...)
{
    QDict *response;
    va_list ap;
    va_start(ap, fmt);
    response = qtest_vqmp_fds_assert_success_ref(qts, fds, nfds, fmt, ap);
    va_end(ap);
    return response;
}

void qtest_qmp_fds_assert_success(QTestState *qts, int *fds, size_t nfds,
                                  const char *fmt, ...)
{
    va_list ap;
    va_start(ap, fmt);
    qtest_vqmp_fds_assert_success(qts, fds, nfds, fmt, ap);
    va_end(ap);
}
#endif /* !_WIN32 */

bool qtest_big_endian(QTestState *s)
{
    return s->big_endian;
}

static bool qtest_check_machine_version(const char *mname, const char *basename,
                                        int major, int minor)
{
    char *newname;
    bool is_equal;

    newname = g_strdup_printf("%s-%i.%i", basename, major, minor);
    is_equal = g_str_equal(mname, newname);
    g_free(newname);

    return is_equal;
}

static bool qtest_is_old_versioned_machine(const char *mname)
{
    const char *dash = strrchr(mname, '-');
    const char *dot = strrchr(mname, '.');
    const char *chr;
    char *bname;
    const int major = QEMU_VERSION_MAJOR;
    const int minor = QEMU_VERSION_MINOR;
    bool res = false;

    if (dash && dot && dot > dash) {
        for (chr = dash + 1; *chr; chr++) {
            if (!qemu_isdigit(*chr) && *chr != '.') {
                return false;
            }
        }
        /*
         * Now check if it is one of the latest versions. Check major + 1
         * and minor + 1 versions as well, since they might already exist
         * in the development branch.
         */
        bname = g_strdup(mname);
        bname[dash - mname] = 0;
        res = !qtest_check_machine_version(mname, bname, major + 1, 0) &&
              !qtest_check_machine_version(mname, bname, major, minor + 1) &&
              !qtest_check_machine_version(mname, bname, major, minor);
        g_free(bname);
    }

    return res;
}

struct MachInfo {
    char *name;
    char *alias;
};

/*
 * Returns an array with pointers to the available machine names.
 * The terminating entry has the name set to NULL.
 */
static struct MachInfo *qtest_get_machines(void)
{
    static struct MachInfo *machines;
    QDict *response, *minfo;
    QList *list;
    const QListEntry *p;
    QObject *qobj;
    QString *qstr;
    QTestState *qts;
    int idx;

    if (machines) {
        return machines;
    }

    qts = qtest_init("-machine none");
    response = qtest_qmp(qts, "{ 'execute': 'query-machines' }");
    g_assert(response);
    list = qdict_get_qlist(response, "return");
    g_assert(list);

    machines = g_new(struct MachInfo, qlist_size(list) + 1);

    for (p = qlist_first(list), idx = 0; p; p = qlist_next(p), idx++) {
        minfo = qobject_to(QDict, qlist_entry_obj(p));
        g_assert(minfo);

        qobj = qdict_get(minfo, "name");
        g_assert(qobj);
        qstr = qobject_to(QString, qobj);
        g_assert(qstr);
        machines[idx].name = g_strdup(qstring_get_str(qstr));

        qobj = qdict_get(minfo, "alias");
        if (qobj) {                               /* The alias is optional */
            qstr = qobject_to(QString, qobj);
            g_assert(qstr);
            machines[idx].alias = g_strdup(qstring_get_str(qstr));
        } else {
            machines[idx].alias = NULL;
        }
    }

    qtest_quit(qts);
    qobject_unref(response);

    memset(&machines[idx], 0, sizeof(struct MachInfo)); /* Terminating entry */
    return machines;
}

void qtest_cb_for_every_machine(void (*cb)(const char *machine),
                                bool skip_old_versioned)
{
    struct MachInfo *machines;
    int i;

    machines = qtest_get_machines();

    for (i = 0; machines[i].name != NULL; i++) {
        /* Ignore machines that cannot be used for qtests */
        if (!strncmp("xenfv", machines[i].name, 5) ||
            g_str_equal("xenpv", machines[i].name) ||
            g_str_equal("xenpvh", machines[i].name)) {
            continue;
        }
        if (!skip_old_versioned ||
            !qtest_is_old_versioned_machine(machines[i].name)) {
            cb(machines[i].name);
        }
    }
}

bool qtest_has_machine(const char *machine)
{
    struct MachInfo *machines;
    int i;

    machines = qtest_get_machines();

    for (i = 0; machines[i].name != NULL; i++) {
        if (g_str_equal(machine, machines[i].name) ||
            (machines[i].alias && g_str_equal(machine, machines[i].alias))) {
            return true;
        }
    }

    return false;
}

bool qtest_has_device(const char *device)
{
    static QList *list;
    const QListEntry *p;
    QObject *qobj;
    QString *qstr;
    QDict *devinfo;
    int idx;

    if (!list) {
        QDict *resp;
        QDict *args;
        QTestState *qts = qtest_init("-machine none");

        args = qdict_new();
        qdict_put_bool(args, "abstract", false);
        qdict_put_str(args, "implements", "device");

        resp = qtest_qmp(qts, "{'execute': 'qom-list-types', 'arguments': %p }",
                         args);
        g_assert(qdict_haskey(resp, "return"));
        list = qdict_get_qlist(resp, "return");
        qobject_ref(list);
        qobject_unref(resp);

        qtest_quit(qts);
    }

    for (p = qlist_first(list), idx = 0; p; p = qlist_next(p), idx++) {
        devinfo = qobject_to(QDict, qlist_entry_obj(p));
        g_assert(devinfo);

        qobj = qdict_get(devinfo, "name");
        g_assert(qobj);
        qstr = qobject_to(QString, qobj);
        g_assert(qstr);
        if (g_str_equal(qstring_get_str(qstr), device)) {
            return true;
        }
    }

    return false;
}

/*
 * Generic hot-plugging test via the device_add QMP commands.
 */
void qtest_qmp_device_add_qdict(QTestState *qts, const char *drv,
                                const QDict *arguments)
{
    QDict *resp;
    QDict *args = arguments ? qdict_clone_shallow(arguments) : qdict_new();

    g_assert(!qdict_haskey(args, "driver"));
    qdict_put_str(args, "driver", drv);
    resp = qtest_qmp(qts, "{'execute': 'device_add', 'arguments': %p}", args);
    g_assert(resp);
    g_assert(!qdict_haskey(resp, "event")); /* We don't expect any events */
    if (qdict_haskey(resp, "error")) {
        fprintf(stderr, "error: %s\n",
            qdict_get_str(qdict_get_qdict(resp, "error"), "desc"));
    }
    g_assert(!qdict_haskey(resp, "error"));
    qobject_unref(resp);
}

void qtest_qmp_device_add(QTestState *qts, const char *driver, const char *id,
                          const char *fmt, ...)
{
    QDict *args;
    va_list ap;

    va_start(ap, fmt);
    args = qdict_from_vjsonf_nofail(fmt, ap);
    va_end(ap);

    g_assert(!qdict_haskey(args, "id"));
    qdict_put_str(args, "id", id);

    qtest_qmp_device_add_qdict(qts, driver, args);
    qobject_unref(args);
}

void qtest_qmp_add_client(QTestState *qts, const char *protocol, int fd)
{
    QDict *resp;

#ifdef WIN32
    WSAPROTOCOL_INFOW info;
    g_autofree char *info64  = NULL;
    SOCKET s;

    assert(fd_is_socket(fd));
    s = _get_osfhandle(fd);
    if (WSADuplicateSocketW(s, GetProcessId((HANDLE)qts->qemu_pid), &info) == SOCKET_ERROR) {
        g_autofree char *emsg = g_win32_error_message(WSAGetLastError());
        g_error("WSADuplicateSocketW failed: %s", emsg);
    }
    info64 = g_base64_encode((guchar *)&info, sizeof(info));
    resp = qtest_qmp(qts, "{'execute': 'get-win32-socket',"
                     "'arguments': {'fdname': 'fdname', 'info': %s}}", info64);
#else
    resp = qtest_qmp_fds(qts, &fd, 1, "{'execute': 'getfd',"
                         "'arguments': {'fdname': 'fdname'}}");
#endif
    g_assert(resp);
    g_assert(!qdict_haskey(resp, "event")); /* We don't expect any events */
    g_assert(!qdict_haskey(resp, "error"));
    qobject_unref(resp);

    resp = qtest_qmp(
        qts, "{'execute': 'add_client',"
        "'arguments': {'protocol': %s, 'fdname': 'fdname'}}", protocol);
    g_assert(resp);
    g_assert(!qdict_haskey(resp, "event")); /* We don't expect any events */
    g_assert(!qdict_haskey(resp, "error"));
    qobject_unref(resp);
}

/*
 * Generic hot-unplugging test via the device_del QMP command.
 * Device deletion will get one response and one event. For example:
 *
 * {'execute': 'device_del','arguments': { 'id': 'scsi-hd'}}
 *
 * will get this one:
 *
 * {"timestamp": {"seconds": 1505289667, "microseconds": 569862},
 *  "event": "DEVICE_DELETED", "data": {"device": "scsi-hd",
 *  "path": "/machine/peripheral/scsi-hd"}}
 *
 * and this one:
 *
 * {"return": {}}
 */
void qtest_qmp_device_del_send(QTestState *qts, const char *id)
{
    QDict *rsp = qtest_qmp(qts, "{'execute': 'device_del', "
                                "'arguments': {'id': %s}}", id);
    g_assert(rsp);
    g_assert(qdict_haskey(rsp, "return"));
    g_assert(!qdict_haskey(rsp, "error"));
    qobject_unref(rsp);
}

void qtest_qmp_device_del(QTestState *qts, const char *id)
{
    qtest_qmp_device_del_send(qts, id);
    qtest_qmp_eventwait(qts, "DEVICE_DELETED");
}

static void qtest_client_set_tx_handler(QTestState *s,
                    QTestSendFn send)
{
    s->ops.send = send;
}
static void qtest_client_set_rx_handler(QTestState *s, QTestRecvFn recv)
{
    s->ops.recv_line = recv;
}
/* A type-safe wrapper for s->send() */
static void send_wrapper(QTestState *s, const char *buf)
{
    s->ops.external_send(s, buf);
}

static GString *qtest_client_inproc_recv_line(QTestState *s)
{
    GString *line;
    size_t offset;
    char *eol;

    eol = strchr(s->rx->str, '\n');
    offset = eol - s->rx->str;
    line = g_string_new_len(s->rx->str, offset);
    g_string_erase(s->rx, 0, offset + 1);
    return line;
}

QTestState *qtest_inproc_init(QTestState **s, bool log, const char* arch,
                    void (*send)(void*, const char*))
{
    QTestState *qts;
    qts = g_new0(QTestState, 1);
    qts->pending_events = NULL;
    *s = qts; /* Expose qts early on, since the query endianness relies on it */
    qts->wstatus = 0;
    for (int i = 0; i < MAX_IRQ; i++) {
        qts->irq_level[i] = false;
    }

    qtest_client_set_rx_handler(qts, qtest_client_inproc_recv_line);

    /* send() may not have a matching prototype, so use a type-safe wrapper */
    qts->ops.external_send = send;
    qtest_client_set_tx_handler(qts, send_wrapper);

    qts->big_endian = qtest_query_target_endianness(qts);

    /*
     * Set a dummy path for QTEST_QEMU_BINARY. Doesn't need to exist, but this
     * way, qtest_get_arch works for inproc qtest.
     */
    gchar *bin_path = g_strconcat("/qemu-system-", arch, NULL);
    g_setenv("QTEST_QEMU_BINARY", bin_path, 0);
    g_free(bin_path);

    return qts;
}

void qtest_client_inproc_recv(void *opaque, const char *str)
{
    QTestState *qts = *(QTestState **)opaque;

    if (!qts->rx) {
        qts->rx = g_string_new(NULL);
    }
    g_string_append(qts->rx, str);
    return;
}

void qtest_qom_set_bool(QTestState *s, const char *path, const char *property,
                         bool value)
{
    QDict *r;

    r = qtest_qmp(s, "{ 'execute': 'qom-set', 'arguments': "
                     "{ 'path': %s, 'property': %s, 'value': %i } }",
                     path, property, value);
    qobject_unref(r);
}

bool qtest_qom_get_bool(QTestState *s, const char *path, const char *property)
{
    QDict *r;
    bool b;

    r = qtest_qmp(s, "{ 'execute': 'qom-get', 'arguments': "
                     "{ 'path': %s, 'property': %s } }", path, property);
    b = qdict_get_bool(r, "return");
    qobject_unref(r);

    return b;
}

bool have_qemu_img(void)
{
    char *rpath;
    const char *path = getenv("QTEST_QEMU_IMG");
    if (!path) {
        return false;
    }

    rpath = realpath(path, NULL);
    if (!rpath) {
        return false;
    } else {
        free(rpath);
        return true;
    }
}

bool mkimg(const char *file, const char *fmt, unsigned size_mb)
{
    gchar *cli;
    bool ret;
    int rc;
    GError *err = NULL;
    char *qemu_img_path;
    gchar *out, *out2;
    char *qemu_img_abs_path;

    qemu_img_path = getenv("QTEST_QEMU_IMG");
    if (!qemu_img_path) {
        return false;
    }
    qemu_img_abs_path = realpath(qemu_img_path, NULL);
    if (!qemu_img_abs_path) {
        return false;
    }

    cli = g_strdup_printf("%s create -f %s %s %uM", qemu_img_abs_path,
                          fmt, file, size_mb);
    ret = g_spawn_command_line_sync(cli, &out, &out2, &rc, &err);
    if (err || !g_spawn_check_exit_status(rc, &err)) {
        fprintf(stderr, "%s\n", err->message);
        g_error_free(err);
    }

    g_free(out);
    g_free(out2);
    g_free(cli);
    free(qemu_img_abs_path);

    return ret && !err;
}