| /* |
| * 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); |
| } |