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/*
* QEMU live migration via Unix Domain Sockets
*
* 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 <string.h>
#include "qemu-common.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
#include "qemu/main-loop.h"
#include "migration/migration.h"
#include "migration/qemu-file.h"
#include "block/block.h"
//#define DEBUG_MIGRATION_UNIX
#ifdef DEBUG_MIGRATION_UNIX
#define DPRINTF(fmt, ...) \
do { printf("migration-unix: " fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
static void unix_wait_for_connect(int fd, Error *err, void *opaque)
{
MigrationState *s = opaque;
if (fd < 0) {
DPRINTF("migrate connect error: %s\n", error_get_pretty(err));
s->file = NULL;
migrate_fd_error(s);
} else {
DPRINTF("migrate connect success\n");
s->file = qemu_fopen_socket(fd, "wb");
migrate_fd_connect(s);
}
}
void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
{
unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
}
static void unix_accept_incoming_migration(void *opaque)
{
struct sockaddr_un addr;
socklen_t addrlen = sizeof(addr);
int s = (intptr_t)opaque;
QEMUFile *f;
int c, err;
do {
c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
err = errno;
} while (c < 0 && err == EINTR);
qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
close(s);
DPRINTF("accepted migration\n");
if (c < 0) {
error_report("could not accept migration connection (%s)",
strerror(err));
return;
}
f = qemu_fopen_socket(c, "rb");
if (f == NULL) {
error_report("could not qemu_fopen socket");
goto out;
}
process_incoming_migration(f);
return;
out:
close(c);
}
void unix_start_incoming_migration(const char *path, Error **errp)
{
int s;
s = unix_listen(path, NULL, 0, errp);
if (s < 0) {
return;
}
qemu_set_fd_handler2(s, NULL, unix_accept_incoming_migration, NULL,
(void *)(intptr_t)s);
}
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