/* * 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_handler(s, 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_handler(s, unix_accept_incoming_migration, NULL, (void *)(intptr_t)s); }