| /* |
| * 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/osdep.h" |
| #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->to_dst_file = qemu_fopen_socket(fd, "wb"); |
| } else { |
| s->to_dst_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); |
| } |