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/*
* 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);
}
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