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639f841346
Introduce a new API in libvirt-qemu.so
virDomainPtr virDomainQemuAttach(virConnectPtr domain,
unsigned long long pid,
unsigned int flags);
This allows libvirtd to attach to an existing, externally
launched QEMU process. This is useful for QEMU developers who
prefer to launch QEMU themselves for debugging/devel reasons,
but still want the benefit of libvirt based tools like
virt-top, virt-viewer, etc
* include/libvirt/libvirt-qemu.h: Define virDomainQemuAttach
* src/driver.h, src/libvirt-qemu.c, src/libvirt_qemu.syms:
Driver glue for virDomainQemuAttach
150 lines
4.5 KiB
C
150 lines
4.5 KiB
C
/*
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* libvirt-qemu.c: Interfaces for the libvirt library to handle qemu-specific
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* APIs.
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*
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* Copyright (C) 2010 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Chris Lalancette <clalance@redhat.com>
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*/
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#include <config.h>
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#include "virterror_internal.h"
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#include "logging.h"
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#include "datatypes.h"
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#include "libvirt/libvirt-qemu.h"
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#define virLibConnError(conn, error, info) \
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virReportErrorHelper(VIR_FROM_NONE, error, NULL, __FUNCTION__, \
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__LINE__, info)
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#define virLibDomainError(domain, error, info) \
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virReportErrorHelper(VIR_FROM_DOM, error, NULL, __FUNCTION__, \
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__LINE__, info)
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int
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virDomainQemuMonitorCommand(virDomainPtr domain, const char *cmd,
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char **result, unsigned int flags)
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{
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virConnectPtr conn;
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VIR_DEBUG("domain=%p, cmd=%s, result=%p, flags=%u", domain, cmd, result, flags);
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virResetLastError();
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if (!VIR_IS_CONNECTED_DOMAIN(domain)) {
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virLibDomainError(NULL, VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
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virDispatchError(NULL);
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return -1;
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}
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conn = domain->conn;
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if (result == NULL) {
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virLibDomainError(domain, VIR_ERR_INVALID_ARG, __FUNCTION__);
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goto error;
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}
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if (conn->flags & VIR_CONNECT_RO) {
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virLibDomainError(domain, VIR_ERR_OPERATION_DENIED, __FUNCTION__);
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goto error;
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}
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if (conn->driver->qemuDomainMonitorCommand) {
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int ret;
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ret = conn->driver->qemuDomainMonitorCommand(domain, cmd, result,
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flags);
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if (ret < 0)
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goto error;
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return ret;
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}
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virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
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error:
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virDispatchError(conn);
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return -1;
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}
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/**
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* virDomainQemuAttach:
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* @conn: pointer to a hypervisor connection
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* @pid: the UNIX process ID of the external QEMU process
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* @flags: optional flags, currently unused
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*
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* This API is QEMU specific, so will only work with hypervisor
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* connections to the QEMU driver.
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*
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* This API will attach to an externally launched QEMU process
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* identified by @pid. There are several requirements to succcesfully
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* attach to an external QEMU process:
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*
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* - It must have been started with a monitor socket using the UNIX
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* domain socket protocol.
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* - No device hotplug/unplug, or other configuration changes can
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* have been made via the monitor since it started.
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* - The '-name' and '-uuid' arguments should have been set (not
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* mandatory, but strongly recommended)
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*
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* If successful, then the guest will appear in the list of running
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* domains for this connection, and other APIs should operate
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* normally (provided the above requirements were honoured
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*
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* Returns a new domain object on success, NULL otherwise
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*/
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virDomainPtr
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virDomainQemuAttach(virConnectPtr conn,
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unsigned pid,
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unsigned int flags)
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{
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VIR_DEBUG("conn=%p, pid=%u, flags=%u", conn, pid, flags);
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virResetLastError();
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if (!VIR_IS_CONNECT(conn)) {
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virLibConnError(NULL, VIR_ERR_INVALID_CONN, __FUNCTION__);
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virDispatchError(NULL);
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return NULL;
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}
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if (pid <= 1) {
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virLibDomainError(domain, VIR_ERR_INVALID_ARG, __FUNCTION__);
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goto error;
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}
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if (conn->flags & VIR_CONNECT_RO) {
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virLibDomainError(domain, VIR_ERR_OPERATION_DENIED, __FUNCTION__);
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goto error;
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}
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if (conn->driver->qemuDomainAttach) {
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virDomainPtr ret;
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ret = conn->driver->qemuDomainAttach(conn, pid, flags);
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if (!ret)
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goto error;
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return ret;
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}
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virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
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error:
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virDispatchError(conn);
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return NULL;
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}
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