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Text of the page (random words):
he actual api call on behalf of the client if successful the returned string is packed into response and then packed into the xdr return parameter finally the domain pointer must be freed diff git a src remote remote_driver c b src remote remote_driver c index 87a68a6 75c655a 100644 a src remote remote_driver c b src remote remote_driver c 9632 6 9632 33 done static char remotedomainhello virdomainptr dom virhelloparamsptr params char rv null remote_domain_hello_args args remote_domain_hello_ret ret struct private_data priv dom conn privatedata remotedriverlock priv make_nonnull_domain args domain dom args params lang params lang null null char params lang args params exclaim params exclaim memset ret 0 sizeof ret if call dom conn priv 0 remote_proc_domain_hello xdrproc_t xdr_remote_domain_hello_args char args xdrproc_t xdr_remote_domain_hello_ret char ret 1 goto done caller frees this rv ret response null null ret response done remotedriverunlock priv return rv 11202 7 11229 7 static virdriver remote_driver remotedomainsnapshotdelete domainsnapshotdelete remoteqemudomainmonitorcommand qemudomainmonitorcommand remotedomainopenconsole domainopenconsole null domainhello remotedomainhello domainhello static virnetworkdriver network_driver here is the implementation of the client side which is organized as a driver just like qemu xen etc i followed the example set by other functions in the remote driver to handle driver locking with that taken care of the structures for xdr arguments and return value are prepared the domain pointer is encoded using a helper function as stated previously xdr requires character pointers to be passed by reference next we make the actual rpc call remote_proc_domain_hello refers to the rpc number that we specified in the protocol definition the prepared args and ret structures are passed along wih their types after the call we unpack the returned string clean up and then return our result string by convention we own the reference on the returned string so we do not need to duplicate it the caller will free it diff git a daemon remote_dispatch_args h b daemon remote_dispatch_args h index 15fa1a0 cb6091a 100644 a daemon remote_dispatch_args h b daemon remote_dispatch_args h 176 3 176 4 remote_domain_set_blkio_parameters_args val_remote_domain_set_blkio_parameters_args remote_domain_get_blkio_parameters_args val_remote_domain_get_blkio_parameters_args remote_domain_migrate_set_max_speed_args val_remote_domain_migrate_set_max_speed_args remote_domain_hello_args val_remote_domain_hello_args diff git a daemon remote_dispatch_prototypes h b daemon remote_dispatch_prototypes h index 3fcf87c 5f2264f 100644 a daemon remote_dispatch_prototypes h b daemon remote_dispatch_prototypes h 338 6 338 14 static int remotedispatchdomainhasmanagedsaveimage remote_error err remote_domain_has_managed_save_image_args args remote_domain_has_managed_save_image_ret ret static int remotedispatchdomainhello struct qemud_server server struct qemud_client client virconnectptr conn remote_message_header hdr remote_error err remote_domain_hello_args args remote_domain_hello_ret ret static int remotedispatchdomaininterfacestats struct qemud_server server struct qemud_client client diff git a daemon remote_dispatch_ret h b daemon remote_dispatch_ret h index 114e832 cdc9c89 100644 a daemon remote_dispatch_ret h b daemon remote_dispatch_ret h 140 3 140 4 remote_domain_is_updated_ret val_remote_domain_is_updated_ret remote_get_sysinfo_ret val_remote_get_sysinfo_ret remote_domain_get_blkio_parameters_ret val_remote_domain_get_blkio_parameters_ret remote_domain_hello_ret val_remote_domain_hello_ret diff git a daemon remote_dispatch_table h b daemon remote_dispatch_table h index c5f6653 fb2c074 100644 a daemon remote_dispatch_table h b daemon remote_dispatch_table h 1042 3 1042 8 args_filter xdrproc_t xdr_remote_domain_migrate_set_max_speed_args ret_filter xdrproc_t xdr_void domainhello 208 fn dispatch_fn remotedispatchdomainhello args_filter xdrproc_t xdr_remote_domain_hello_args ret_filter xdrproc_t xdr_remote_domain_hello_ret diff git a src remote remote_protocol c b src remote remote_protocol c index 7ecea9d ba31d50 100644 a src remote remote_protocol c b src remote remote_protocol c 3872 6 3872 37 xdr_remote_domain_open_console_args xdr xdrs remote_domain_open_console_args bool_t xdr_remote_domain_hello_params xdr xdrs remote_domain_hello_params objp if xdr_remote_string xdrs objp lang return false if xdr_int xdrs objp exclaim return false return true bool_t xdr_remote_domain_hello_args xdr xdrs remote_domain_hello_args objp if xdr_remote_nonnull_domain xdrs objp domain return false if xdr_remote_domain_hello_params xdrs objp params return false return true bool_t xdr_remote_domain_hello_ret xdr xdrs remote_domain_hello_ret objp if xdr_remote_string xdrs objp response return false return true bool_t xdr_remote_procedure xdr xdrs remote_procedure objp diff git a src remote remote_protocol h b src remote remote_protocol h index 87de0da 318fa34 100644 a src remote remote_protocol h b src remote remote_protocol h 2184 6 2184 23 struct remote_domain_open_console_args u_int flags typedef struct remote_domain_open_console_args remote_domain_open_console_args struct remote_domain_hello_params remote_string lang int exclaim typedef struct remote_domain_hello_params remote_domain_hello_params struct remote_domain_hello_args remote_nonnull_domain domain remote_domain_hello_params params typedef struct remote_domain_hello_args remote_domain_hello_args struct remote_domain_hello_ret remote_string response typedef struct remote_domain_hello_ret remote_domain_hello_ret define remote_program 0x20008086 define remote_protocol_version 1 2395 6 2412 7 enum remote_procedure remote_proc_domain_set_blkio_parameters 205 remote_proc_domain_get_blkio_parameters 206 remote_proc_domain_migrate_set_max_speed 207 remote_proc_domain_hello 208 typedef enum remote_procedure remote_procedure 2776 6 2794 9 extern bool_t xdr_remote_domain_snapshot_current_ret xdr remote_domain_snap extern bool_t xdr_remote_domain_revert_to_snapshot_args xdr remote_domain_revert_to_snapshot_args extern bool_t xdr_remote_domain_snapshot_delete_args xdr remote_domain_snapshot_delete_args extern bool_t xdr_remote_domain_open_console_args xdr remote_domain_open_console_args extern bool_t xdr_remote_domain_hello_params xdr remote_domain_hello_params extern bool_t xdr_remote_domain_hello_args xdr remote_domain_hello_args extern bool_t xdr_remote_domain_hello_ret xdr remote_domain_hello_ret extern bool_t xdr_remote_procedure xdr remote_procedure extern bool_t xdr_remote_message_type xdr remote_message_type extern bool_t xdr_remote_message_status xdr remote_message_status 3131 6 3152 9 extern bool_t xdr_remote_domain_snapshot_current_ret extern bool_t xdr_remote_domain_revert_to_snapshot_args extern bool_t xdr_remote_domain_snapshot_delete_args extern bool_t xdr_remote_domain_open_console_args extern bool_t xdr_remote_domain_hello_params extern bool_t xdr_remote_domain_hello_args extern bool_t xdr_remote_domain_hello_ret extern bool_t xdr_remote_procedure extern bool_t xdr_remote_message_type extern bool_t xdr_remote_message_status the rest of this is auto generated by rpcgen therefore i don t see a need to discuss it any further up next create hello virsh command posted in uncategorized leave a comment implement the qemu version of hello posted on april 15 2011 by aglitke this is the fifth post in the series howto add libvirt support for a qemu command now begins the fun part where we can actually interact with qemu to implement the command in this patch we first create a virdrvdomainhello function in the qemu driver this function locates the domain we are targetting issues a monitor command and returns the result we provide support for issuing the command using the qmp and hmp monitors find the patch here diff git a src qemu qemu_driver c b src qemu qemu_driver c index 40bb4c0 de6c719 100644 a src qemu qemu_driver c b src qemu qemu_driver c 7079 6 7079 50 cleanup return ret static char qemudomainhello virdomainptr dom virhelloparamsptr params struct qemud_driver driver dom conn privatedata virdomainobjptr vm null char greeting null qemudriverlock driver vm virdomainfindbyuuid driver domains dom uuid qemudriverunlock driver if vm char uuidstr vir_uuid_string_buflen viruuidformat dom uuid uuidstr qemureporterror vir_err_no_domain _ no domain with matching uuid s uuidstr goto cleanup if qemudomainobjbeginjob vm 0 goto cleanup if virdomainobjisactive vm qemudomainobjprivateptr priv vm privatedata qemudomainobjentermonitor vm greeting qemumonitorhello priv mon params if greeting qemureporterror vir_err_internal_error s _ monitor command failed qemudomainobjexitmonitor vm else qemureporterror vir_err_operation_invalid s _ domain is not running if qemudomainobjendjob vm 0 vm null cleanup if vm virdomainobjunlock vm return greeting static virdriver qemudriver vir_drv_qemu 7191 7 7235 7 static virdriver qemudriver qemudomainsnapshotdelete domainsnapshotdelete qemudomainmonitorcommand qemudomainmonitorcommand qemudomainopenconsole domainopenconsole null domainhello qemudomainhello domainhello above is the top level implementation for the qemu driver the first thing we do is find the vm object corresponding to the domain passed in by performing a uuid lookup be careful to follow driver locking rules just follow the many existing examples in order to get this right in order to issue commands to a qemu monitor you must enter a job context this is another form of locking to make sure that commands are executed synchronously again look to other commands for examples of correct usage once in job context we call into the monitor code to perform the monitor command let s look at that part next diff git a src qemu qemu_monitor c b src qemu qemu_monitor c index 800f744 46b89ae 100644 a src qemu qemu_monitor c b src qemu qemu_monitor c 2189 6 2189 24 int qemumonitordeletesnapshot qemumonitorptr mon const char name return ret char qemumonitorhello qemumonitorptr mon virhelloparams params char ret vir_debug mon p params p mon params if mon qemureporterror vir_err_invalid_arg s _ monitor must not be null return null if mon json ret qemumonitorjsonhello mon params else ret qemumonitortexthello mon params return ret int qemumonitorarbitrarycommand qemumonitorptr mon const char cmd char reply diff git a src qemu qemu_monitor h b src qemu qemu_monitor h index c90219b c1ecd10 100644 a src qemu qemu_monitor h b src qemu qemu_monitor h 418 6 418 8 int qemumonitorcreatesnapshot qemumonitorptr mon const char name int qemumonitorloadsnapshot qemumonitorptr mon const char name int qemumonitordeletesnapshot qemumonitorptr mon const char name char qemumonitorhello qemumonitorptr mon virhelloparams params int qemumonitorarbitrarycommand qemumonitorptr mon const char cmd char reply the function qemumonitorhello is yet another wrapper around actual functionality libvirt supports the qmp and hmp monitor protocols this function selects the appropriate function depending on the protocol being used by the active monitor diff git a src qemu qemu_monitor_json c b src qemu qemu_monitor_json c index 6bd03d6 5f18cfa 100644 a src qemu qemu_monitor_json c b src qemu qemu_monitor_json c 2470 6 2470 49 cleanup return ret char qemumonitorjsonhello qemumonitorptr mon virhelloparams params const char response char ret null virjsonvalueptr cmd virjsonvalueptr reply null virjsonvalueptr obj if params lang null cmd qemumonitorjsonmakecommand hello b exclaim params exclaim 0 null else cmd qemumonitorjsonmakecommand hello b exclaim params exclaim 0 s lang params lang null if cmd return null if qemumonitorjsoncommand mon cmd reply 0 qemumonitorjsoncheckerror cmd reply 0 goto cleanup if obj virjsonvalueobjectget reply return obj type vir_json_type_object goto cleanup response virjsonvalueobjectgetstring obj response if response null qemureporterror vir_err_internal_error s _ malformed response to hello command goto cleanup return a copy because we will be freeing reply below ret strdup response cleanup virjsonvaluefree cmd virjsonvaluefree reply return ret int qemumonitorjsonarbitrarycommand qemumonitorptr mon const char cmd_str char reply_str diff git a src qemu qemu_monitor_json h b src qemu qemu_monitor_json h index 086f0e1 e0cf5bd 100644 a src qemu qemu_monitor_json h b src qemu qemu_monitor_json h 199 6 199 8 int qemumonitorjsoncreatesnapshot qemumonitorptr mon const char name int qemumonitorjsonloadsnapshot qemumonitorptr mon const char name int qemumonitorjsondeletesnapshot qemumonitorptr mon const char name char qemumonitorjsonhello qemumonitorptr mon virhelloparams params int qemumonitorjsonarbitrarycommand qemumonitorptr mon const char cmd_str char reply_str next implement the json version of the hello command for qmp monitors this file contains very useful functions for manipulating json objects qemumonitorjsonmakecommand is used to build the proper json command string next we send the command receive the response and check for errors we then use the virjsonvalueobjectget family of functions to extract the returned string from the response be careful when returning pointers and be sure to think about how the api is supposed to work we want to return a new string to the caller and transfer ownership of that string to the caller in order to do this we must make a copy because the json response is going to be freed next the string we return will eventually be freed by the caller when it is no longer needed diff git a src qemu qemu_monitor_text c b src qemu qemu_monitor_text c index 75b2995 452c43f 100644 a src qemu qemu_monitor_text c b src qemu qemu_monitor_text c 2607 6 2607 36 cleanup return ret char qemumonitortexthello qemumonitorptr mon virhelloparams params char cmd char reply null int rc if params exclaim 0 rc virasprintf cmd hello e s params lang params lang else rc virasprintf cmd hello s params lang params lang if rc 1 virreportoomerror return null if qemumonitorhmpcommand mon cmd reply qemureporterror vir_err_operation_failed _ failed to perform command s cmd vir_free reply vir_free cmd we own the reference to reply return it and let the caller free it return reply int qemumonitortextarbitrarycommand qemumonitorptr mon const char cmd char reply diff git a src qemu qemu_monitor_text h b src qemu qemu_monitor_text h index 0838a2b 6c5f4f2 100644 a src qemu qemu_monitor_text h b src qemu qemu_monitor_text h 195 6 195 8 int qemumonitortextcreatesnapshot qemumonitorptr mon const char name int qemumonitortextloadsnapshot qemumonitorptr mon const char name int qemumonitortextdeletesnapshot qemumonitorptr mon const char name char qemumonitortexthello qemumonitorptr mon virhelloparams params int qemumonitortextarbitrarycommand qemumonitorptr mon const char cmd char reply last but not least we have the hmp implementation of the command hopefully some day we will only need to program one monitor protocol but for now there are two firs...
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