diff options
| -rw-r--r-- | monitor.c | 113 | ||||
| -rw-r--r-- | monitor.h | 2 |
2 files changed, 111 insertions, 4 deletions
@@ -76,6 +76,12 @@ * */ +typedef struct MonitorCompletionData MonitorCompletionData; +struct MonitorCompletionData { + Monitor *mon; + void (*user_print)(Monitor *mon, const QObject *data); +}; + typedef struct mon_cmd_t { const char *name; const char *args_type; @@ -85,9 +91,13 @@ typedef struct mon_cmd_t { union { void (*info)(Monitor *mon); void (*info_new)(Monitor *mon, QObject **ret_data); + int (*info_async)(Monitor *mon, MonitorCompletion *cb, void *opaque); void (*cmd)(Monitor *mon, const QDict *qdict); void (*cmd_new)(Monitor *mon, const QDict *params, QObject **ret_data); + int (*cmd_async)(Monitor *mon, const QDict *params, + MonitorCompletion *cb, void *opaque); } mhandler; + int async; } mon_cmd_t; /* file descriptors passed via SCM_RIGHTS */ @@ -255,6 +265,11 @@ static inline int monitor_handler_ported(const mon_cmd_t *cmd) return cmd->user_print != NULL; } +static inline bool monitor_handler_is_async(const mon_cmd_t *cmd) +{ + return cmd->async != 0; +} + static inline int monitor_has_error(const Monitor *mon) { return mon->error != NULL; @@ -453,6 +468,65 @@ static void do_commit(Monitor *mon, const QDict *qdict) } } +static void user_monitor_complete(void *opaque, QObject *ret_data) +{ + MonitorCompletionData *data = (MonitorCompletionData *)opaque; + + if (ret_data) { + data->user_print(data->mon, ret_data); + } + monitor_resume(data->mon); + qemu_free(data); +} + +static void qmp_monitor_complete(void *opaque, QObject *ret_data) +{ + monitor_protocol_emitter(opaque, ret_data); +} + +static void qmp_async_cmd_handler(Monitor *mon, const mon_cmd_t *cmd, + const QDict *params) +{ + cmd->mhandler.cmd_async(mon, params, qmp_monitor_complete, mon); +} + +static void qmp_async_info_handler(Monitor *mon, const mon_cmd_t *cmd) +{ + cmd->mhandler.info_async(mon, qmp_monitor_complete, mon); +} + +static void user_async_cmd_handler(Monitor *mon, const mon_cmd_t *cmd, + const QDict *params) +{ + int ret; + + MonitorCompletionData *cb_data = qemu_malloc(sizeof(*cb_data)); + cb_data->mon = mon; + cb_data->user_print = cmd->user_print; + monitor_suspend(mon); + ret = cmd->mhandler.cmd_async(mon, params, + user_monitor_complete, cb_data); + if (ret < 0) { + monitor_resume(mon); + qemu_free(cb_data); + } +} + +static void user_async_info_handler(Monitor *mon, const mon_cmd_t *cmd) +{ + int ret; + + MonitorCompletionData *cb_data = qemu_malloc(sizeof(*cb_data)); + cb_data->mon = mon; + cb_data->user_print = cmd->user_print; + monitor_suspend(mon); + ret = cmd->mhandler.info_async(mon, user_monitor_complete, cb_data); + if (ret < 0) { + monitor_resume(mon); + qemu_free(cb_data); + } +} + static void do_info(Monitor *mon, const QDict *qdict, QObject **ret_data) { const mon_cmd_t *cmd; @@ -476,7 +550,19 @@ static void do_info(Monitor *mon, const QDict *qdict, QObject **ret_data) goto help; } - if (monitor_handler_ported(cmd)) { + if (monitor_handler_is_async(cmd)) { + if (monitor_ctrl_mode(mon)) { + qmp_async_info_handler(mon, cmd); + } else { + user_async_info_handler(mon, cmd); + } + /* + * Indicate that this command is asynchronous and will not return any + * data (not even empty). Instead, the data will be returned via a + * completion callback. + */ + *ret_data = qobject_from_jsonf("{ '__mon_async': 'return' }"); + } else if (monitor_handler_ported(cmd)) { cmd->mhandler.info_new(mon, ret_data); if (!monitor_ctrl_mode(mon)) { @@ -3588,6 +3674,11 @@ static void monitor_print_error(Monitor *mon) mon->error = NULL; } +static int is_async_return(const QObject *data) +{ + return data && qdict_haskey(qobject_to_qdict(data), "__mon_async"); +} + static void monitor_call_handler(Monitor *mon, const mon_cmd_t *cmd, const QDict *params) { @@ -3595,7 +3686,15 @@ static void monitor_call_handler(Monitor *mon, const mon_cmd_t *cmd, cmd->mhandler.cmd_new(mon, params, &data); - if (monitor_ctrl_mode(mon)) { + if (is_async_return(data)) { + /* + * Asynchronous commands have no initial return data but they can + * generate errors. Data is returned via the async completion handler. + */ + if (monitor_ctrl_mode(mon) && monitor_has_error(mon)) { + monitor_protocol_emitter(mon, NULL); + } + } else if (monitor_ctrl_mode(mon)) { /* Monitor Protocol */ monitor_protocol_emitter(mon, data); } else { @@ -3620,7 +3719,9 @@ static void handle_user_command(Monitor *mon, const char *cmdline) qemu_errors_to_mon(mon); - if (monitor_handler_ported(cmd)) { + if (monitor_handler_is_async(cmd)) { + user_async_cmd_handler(mon, cmd, qdict); + } else if (monitor_handler_ported(cmd)) { monitor_call_handler(mon, cmd, qdict); } else { cmd->mhandler.cmd(mon, qdict); @@ -4082,7 +4183,11 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens) goto err_out; } - monitor_call_handler(mon, cmd, args); + if (monitor_handler_is_async(cmd)) { + qmp_async_cmd_handler(mon, cmd, args); + } else { + monitor_call_handler(mon, cmd, args); + } goto out; err_input: @@ -44,4 +44,6 @@ void monitor_printf(Monitor *mon, const char *fmt, ...) void monitor_print_filename(Monitor *mon, const char *filename); void monitor_flush(Monitor *mon); +typedef void (MonitorCompletion)(void *opaque, QObject *ret_data); + #endif /* !MONITOR_H */ |