Re: [libvirt] [Qemu-devel] [PATCH v4 2/7] qapi: Convert getfd and closefd

Signed-off-by: Corey Bryant <coreyb(a)linux.vnet.ibm.com&gt;

--- v2: -Convert getfd and closefd to QAPI (lcapitulino(a)redhat.com) -Remove changes that returned fd from getfd (lcapitulino(a)redhat.com) -Wrap hmp_* functions around qmp_* functions (kwolf(a)redhat.com) -Move hmp_* functions to hmp.c (lcapitulino(a)redhat.com) -Drop .user_print lines (lcapitulino(a)redhat.com) -Use 'cmd' instead of 'cmd_new' for HMP (lcapitulino(a)redhat.com) -Change QMP command existance back to 0.14 (lcapitulino(a)redhat.com) v3: -Remove unnecessary return statements from qmp_* functions (lcapitulino(a)redhat.com) -Add notes to QMP command describing behavior in more detail (lcapitulino(a)redhat.com, eblake(a)redhat.com) v4: -No changes hmp-commands.hx | 6 ++---- hmp.c | 18 ++++++++++++++++++ hmp.h | 2 ++ monitor.c | 32 ++++++++++++++------------------ qapi-schema.json | 35 +++++++++++++++++++++++++++++++++++ qmp-commands.hx | 14 ++++++++++---- 6 files changed, 81 insertions(+), 26 deletions(-) diff --git a/hmp-commands.hx b/hmp-commands.hx index f5d9d91..eea8b32 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1236,8 +1236,7 @@ ETEXI .args_type = "fdname:s", .params = "getfd name", .help = "receive a file descriptor via SCM rights and assign it a name", - .user_print = monitor_user_noop, - .mhandler.cmd_new = do_getfd, + .mhandler.cmd = hmp_getfd, }, STEXI @@ -1253,8 +1252,7 @@ ETEXI .args_type = "fdname:s", .params = "closefd name", .help = "close a file descriptor previously passed via SCM rights", - .user_print = monitor_user_noop, - .mhandler.cmd_new = do_closefd, + .mhandler.cmd = hmp_closefd, }, STEXI diff --git a/hmp.c b/hmp.c index 2ce8cb9..6241856 100644 --- a/hmp.c +++ b/hmp.c @@ -999,3 +999,21 @@ void hmp_netdev_del(Monitor *mon, const QDict *qdict) qmp_netdev_del(id, &err); hmp_handle_error(mon, &err); } + +void hmp_getfd(Monitor *mon, const QDict *qdict) +{ + const char *fdname = qdict_get_str(qdict, "fdname"); + Error *errp = NULL; + + qmp_getfd(fdname, &errp); + hmp_handle_error(mon, &errp); +} + +void hmp_closefd(Monitor *mon, const QDict *qdict) +{ + const char *fdname = qdict_get_str(qdict, "fdname"); + Error *errp = NULL; + + qmp_closefd(fdname, &errp); + hmp_handle_error(mon, &errp); +} diff --git a/hmp.h b/hmp.h index 79d138d..8d2b0d7 100644 --- a/hmp.h +++ b/hmp.h @@ -64,5 +64,7 @@ void hmp_device_del(Monitor *mon, const QDict *qdict); void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict); void hmp_netdev_add(Monitor *mon, const QDict *qdict); void hmp_netdev_del(Monitor *mon, const QDict *qdict); +void hmp_getfd(Monitor *mon, const QDict *qdict); +void hmp_closefd(Monitor *mon, const QDict *qdict); #endif diff --git a/monitor.c b/monitor.c index a3bc2c7..1a7f7e7 100644 --- a/monitor.c +++ b/monitor.c @@ -2182,48 +2182,45 @@ static void do_inject_mce(Monitor *mon, const QDict *qdict) } #endif -static int do_getfd(Monitor *mon, const QDict *qdict, QObject **ret_data) +void qmp_getfd(const char *fdname, Error **errp) { - const char *fdname = qdict_get_str(qdict, "fdname"); mon_fd_t *monfd; int fd; - fd = qemu_chr_fe_get_msgfd(mon->chr); + fd = qemu_chr_fe_get_msgfd(cur_mon->chr); if (fd == -1) { - qerror_report(QERR_FD_NOT_SUPPLIED); - return -1; + error_set(errp, QERR_FD_NOT_SUPPLIED); + return; } if (qemu_isdigit(fdname[0])) { - qerror_report(QERR_INVALID_PARAMETER_VALUE, "fdname", - "a name not starting with a digit"); - return -1; + error_set(errp, QERR_INVALID_PARAMETER_VALUE, "fdname", + "a name not starting with a digit"); + return; } - QLIST_FOREACH(monfd, &mon->fds, next) { + QLIST_FOREACH(monfd, &cur_mon->fds, next) { if (strcmp(monfd->name, fdname) != 0) { continue; } close(monfd->fd); monfd->fd = fd; - return 0; + return; } monfd = g_malloc0(sizeof(mon_fd_t)); monfd->name = g_strdup(fdname); monfd->fd = fd; - QLIST_INSERT_HEAD(&mon->fds, monfd, next); - return 0; + QLIST_INSERT_HEAD(&cur_mon->fds, monfd, next); } -static int do_closefd(Monitor *mon, const QDict *qdict, QObject **ret_data) +void qmp_closefd(const char *fdname, Error **errp) { - const char *fdname = qdict_get_str(qdict, "fdname"); mon_fd_t *monfd; - QLIST_FOREACH(monfd, &mon->fds, next) { + QLIST_FOREACH(monfd, &cur_mon->fds, next) { if (strcmp(monfd->name, fdname) != 0) { continue; } @@ -2232,11 +2229,10 @@ static int do_closefd(Monitor *mon, const QDict *qdict, QObject **ret_data) close(monfd->fd); g_free(monfd->name); g_free(monfd); - return 0; + return; } - qerror_report(QERR_FD_NOT_FOUND, fdname); - return -1; + error_set(errp, QERR_FD_NOT_FOUND, fdname); } static void do_loadvm(Monitor *mon, const QDict *qdict) diff --git a/qapi-schema.json b/qapi-schema.json index 3b6e346..26a6b84 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -1862,3 +1862,38 @@ # Since: 0.14.0 ## { 'command': 'netdev_del', 'data': {'id': 'str'} } + +## +# @getfd: +# +# Receive a file descriptor via SCM rights and assign it a name +# +# @fdname: file descriptor name +# +# Returns: Nothing on success +# If file descriptor was not received, FdNotSupplied +# If @fdname is not valid, InvalidParameterType +# +# Since: 0.14.0 +# +# Notes: If @fdname already exists, the file descriptor assigned to +# it will be closed and replaced by the received file +# descriptor. +# The 'closefd' command can be used to explicitly close the +# file descriptor when it is no longer needed. +## +{ 'command': 'getfd', 'data': {'fdname': 'str'} } + +## +# @closefd: +# +# Close a file descriptor previously passed via SCM rights +# +# @fdname: file descriptor name +# +# Returns: Nothing on success +# If @fdname is not found, FdNotFound +# +# Since: 0.14.0 +## +{ 'command': 'closefd', 'data': {'fdname': 'str'} } diff --git a/qmp-commands.hx b/qmp-commands.hx index 2e1a38e..e3cf3c5 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -873,8 +873,7 @@ EQMP .args_type = "fdname:s", .params = "getfd name", .help = "receive a file descriptor via SCM rights and assign it a name", - .user_print = monitor_user_noop, - .mhandler.cmd_new = do_getfd, + .mhandler.cmd_new = qmp_marshal_input_getfd, }, SQMP @@ -892,6 +891,14 @@ Example: -> { "execute": "getfd", "arguments": { "fdname": "fd1" } } <- { "return": {} } +Notes: + +(1) If the name specified by the "fdname" argument already exists, + the file descriptor assigned to it will be closed and replaced + by the received file descriptor. +(2) The 'closefd' command can be used to explicitly close the file + descriptor when it is no longer needed. + EQMP { @@ -899,8 +906,7 @@ EQMP .args_type = "fdname:s", .params = "closefd name", .help = "close a file descriptor previously passed via SCM rights", - .user_print = monitor_user_noop, - .mhandler.cmd_new = do_closefd, + .mhandler.cmd_new = qmp_marshal_input_closefd, }, SQMP