/* * QEMU live migration * * Copyright IBM, Corp. 2008 * Copyright Dell MessageOne 2008 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * Charles Duffy <charles_duffy@messageone.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_socket.h" #include "migration.h" #include "qemu-char.h" #include "buffered_file.h" #include "block.h" #include <sys/types.h> #include <sys/wait.h> //#define DEBUG_MIGRATION_EXEC #ifdef DEBUG_MIGRATION_EXEC #define DPRINTF(fmt, ...) \ do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0) #else #define DPRINTF(fmt, ...) \ do { } while (0) #endif static int file_errno(MigrationState *s) { return errno; } static int file_write(MigrationState *s, const void * buf, size_t size) { return write(s->fd, buf, size); } static int exec_close(MigrationState *s) { int ret = 0; DPRINTF("exec_close\n"); if (s->opaque) { ret = qemu_fclose(s->opaque); s->opaque = NULL; s->fd = -1; if (ret >= 0 && !(WIFEXITED(ret) && WEXITSTATUS(ret) == 0)) { /* close succeeded, but non-zero exit code: */ ret = -EIO; /* fake errno value */ } } return ret; } int exec_start_outgoing_migration(MigrationState *s, const char *command) { FILE *f; f = popen(command, "w"); if (f == NULL) { DPRINTF("Unable to popen exec target\n"); goto err_after_popen; } s->fd = fileno(f); if (s->fd == -1) { DPRINTF("Unable to retrieve file descriptor for popen'd handle\n"); goto err_after_open; } socket_set_nonblock(s->fd); s->opaque = qemu_popen(f, "w"); s->close = exec_close; s->get_error = file_errno; s->write = file_write; migrate_fd_connect(s); return 0; err_after_open: pclose(f); err_after_popen: return -1; } static void exec_accept_incoming_migration(void *opaque) { QEMUFile *f = opaque; process_incoming_migration(f); qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL); qemu_fclose(f); } int exec_start_incoming_migration(const char *command) { QEMUFile *f; DPRINTF("Attempting to start an incoming migration\n"); f = qemu_popen_cmd(command, "r"); if(f == NULL) { DPRINTF("Unable to apply qemu wrapper to popen file\n"); return -errno; } qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, exec_accept_incoming_migration, NULL, f); return 0; }