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/*
* libvirt-qemu.c: Interfaces for the libvirt library to handle qemu-specific
* APIs.
*
* Copyright (C) 2010-2012 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Chris Lalancette <clalance@redhat.com>
*/
#include <config.h>
#include "virterror_internal.h"
#include "logging.h"
#include "datatypes.h"
#include "libvirt/libvirt-qemu.h"
#define VIR_FROM_THIS VIR_FROM_NONE
#define virLibConnError(conn, error, info) \
virReportErrorHelper(VIR_FROM_NONE, error, NULL, __FUNCTION__, \
__LINE__, info)
#define virLibDomainError(domain, error, info) \
virReportErrorHelper(VIR_FROM_DOM, error, NULL, __FUNCTION__, \
__LINE__, info)
/**
* virDomainQemuMonitorCommand:
* @domain: a domain object
* @cmd: the qemu monitor command string
* @result: a string returned by @cmd
* @flags: bitwise-or of supported virDomainQemuMonitorCommandFlags
*
* This API is QEMU specific, so it will only work with hypervisor
* connections to the QEMU driver.
*
* Send an arbitrary monitor command @cmd to @domain through the
* qemu monitor. There are several requirements to safely and
* successfully use this API:
*
* - A @cmd that queries state without making any modifications is safe
* - A @cmd that alters state that is also tracked by libvirt is unsafe,
* and may cause libvirtd to crash
* - A @cmd that alters state not tracked by the current version of
* libvirt is possible as a means to test new qemu features before
* they have support in libvirt, but no guarantees are made to safety
*
* If VIR_DOMAIN_QEMU_MONITOR_COMMAND_HMP is set, the command is
* considered to be a human monitor command and libvirt will automatically
* convert it into QMP if needed. In that case the @result will also
* be converted back from QMP.
*
* If successful, @result will be filled with the string output of the
* @cmd, and the caller must free this string.
*
* Returns 0 in case of success, -1 in case of failure
*
*/
int
virDomainQemuMonitorCommand(virDomainPtr domain, const char *cmd,
char **result, unsigned int flags)
{
virConnectPtr conn;
VIR_DEBUG("domain=%p, cmd=%s, result=%p, flags=%x",
domain, cmd, result, flags);
virResetLastError();
if (!VIR_IS_CONNECTED_DOMAIN(domain)) {
virLibDomainError(NULL, VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
virDispatchError(NULL);
return -1;
}
conn = domain->conn;
virCheckNonNullArgGoto(result, error);
if (conn->flags & VIR_CONNECT_RO) {
virLibDomainError(domain, VIR_ERR_OPERATION_DENIED, __FUNCTION__);
goto error;
}
if (conn->driver->qemuDomainMonitorCommand) {
int ret;
ret = conn->driver->qemuDomainMonitorCommand(domain, cmd, result,
flags);
if (ret < 0)
goto error;
return ret;
}
virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
error:
virDispatchError(conn);
return -1;
}
/**
* virDomainQemuAttach:
* @conn: pointer to a hypervisor connection
* @pid_value: the UNIX process ID of the external QEMU process
* @flags: optional flags, currently unused
*
* This API is QEMU specific, so it will only work with hypervisor
* connections to the QEMU driver.
*
* This API will attach to an externally launched QEMU process
* identified by @pid. There are several requirements to successfully
* attach to an external QEMU process:
*
* - It must have been started with a monitor socket using the UNIX
* domain socket protocol.
* - No device hotplug/unplug, or other configuration changes can
* have been made via the monitor since it started.
* - The '-name' and '-uuid' arguments should have been set (not
* mandatory, but strongly recommended)
*
* To date, the only platforms we know of where pid_t is larger than
* unsigned int (64-bit Windows) also lack UNIX sockets, so the choice
* of @pid_value as an unsigned int should not present any difficulties.
*
* If successful, then the guest will appear in the list of running
* domains for this connection, and other APIs should operate
* normally (provided the above requirements were honored).
*
* Returns a new domain object on success, NULL otherwise
*/
virDomainPtr
virDomainQemuAttach(virConnectPtr conn,
unsigned int pid_value,
unsigned int flags)
{
pid_t pid = pid_value;
VIR_DEBUG("conn=%p, pid=%u, flags=%x", conn, pid_value, flags);
virResetLastError();
if (!VIR_IS_CONNECT(conn)) {
virLibConnError(NULL, VIR_ERR_INVALID_CONN, __FUNCTION__);
virDispatchError(NULL);
return NULL;
}
virCheckPositiveArgGoto(pid_value, error);
if (pid != pid_value) {
virReportInvalidArg(pid_value,
_("pid_value in %s is too large"),
__FUNCTION__);
goto error;
}
if (conn->flags & VIR_CONNECT_RO) {
virLibDomainError(domain, VIR_ERR_OPERATION_DENIED, __FUNCTION__);
goto error;
}
if (conn->driver->qemuDomainAttach) {
virDomainPtr ret;
ret = conn->driver->qemuDomainAttach(conn, pid_value, flags);
if (!ret)
goto error;
return ret;
}
virLibConnError(conn, VIR_ERR_NO_SUPPORT, __FUNCTION__);
error:
virDispatchError(conn);
return NULL;
}
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