mirror of https://gitee.com/openkylin/qemu.git
89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
/*
|
|
* QEMU live migration via generic fd
|
|
*
|
|
* Copyright Red Hat, Inc. 2009
|
|
*
|
|
* Authors:
|
|
* Chris Lalancette <clalance@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
* Contributions after 2012-01-13 are licensed under the terms of the
|
|
* GNU GPL, version 2 or (at your option) any later version.
|
|
*/
|
|
|
|
#include "qemu-common.h"
|
|
#include "qemu/main-loop.h"
|
|
#include "qemu/sockets.h"
|
|
#include "migration/migration.h"
|
|
#include "monitor/monitor.h"
|
|
#include "migration/qemu-file.h"
|
|
#include "block/block.h"
|
|
|
|
//#define DEBUG_MIGRATION_FD
|
|
|
|
#ifdef DEBUG_MIGRATION_FD
|
|
#define DPRINTF(fmt, ...) \
|
|
do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0)
|
|
#else
|
|
#define DPRINTF(fmt, ...) \
|
|
do { } while (0)
|
|
#endif
|
|
|
|
static bool fd_is_socket(int fd)
|
|
{
|
|
struct stat stat;
|
|
int ret = fstat(fd, &stat);
|
|
if (ret == -1) {
|
|
/* When in doubt say no */
|
|
return false;
|
|
}
|
|
return S_ISSOCK(stat.st_mode);
|
|
}
|
|
|
|
void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
|
|
{
|
|
int fd = monitor_get_fd(cur_mon, fdname, errp);
|
|
if (fd == -1) {
|
|
return;
|
|
}
|
|
|
|
if (fd_is_socket(fd)) {
|
|
s->file = qemu_fopen_socket(fd, "wb");
|
|
} else {
|
|
s->file = qemu_fdopen(fd, "wb");
|
|
}
|
|
|
|
migrate_fd_connect(s);
|
|
}
|
|
|
|
static void fd_accept_incoming_migration(void *opaque)
|
|
{
|
|
QEMUFile *f = opaque;
|
|
|
|
qemu_set_fd_handler(qemu_get_fd(f), NULL, NULL, NULL);
|
|
process_incoming_migration(f);
|
|
}
|
|
|
|
void fd_start_incoming_migration(const char *infd, Error **errp)
|
|
{
|
|
int fd;
|
|
QEMUFile *f;
|
|
|
|
DPRINTF("Attempting to start an incoming migration via fd\n");
|
|
|
|
fd = strtol(infd, NULL, 0);
|
|
if (fd_is_socket(fd)) {
|
|
f = qemu_fopen_socket(fd, "rb");
|
|
} else {
|
|
f = qemu_fdopen(fd, "rb");
|
|
}
|
|
if(f == NULL) {
|
|
error_setg_errno(errp, errno, "failed to open the source descriptor");
|
|
return;
|
|
}
|
|
|
|
qemu_set_fd_handler(fd, fd_accept_incoming_migration, NULL, f);
|
|
}
|