root / migration-exec.c @ 73f5e313
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/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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* Copyright Dell MessageOne 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Charles Duffy <charles_duffy@messageone.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu-common.h" |
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#include "qemu_socket.h" |
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#include "migration.h" |
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#include "qemu-char.h" |
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#include "buffered_file.h" |
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#include "block.h" |
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#include <sys/types.h> |
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#include <sys/wait.h> |
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//#define DEBUG_MIGRATION_EXEC
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#ifdef DEBUG_MIGRATION_EXEC
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#define DPRINTF(fmt, ...) \
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do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) \
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do { } while (0) |
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#endif
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static int file_errno(MigrationState *s) |
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{ |
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return errno;
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} |
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static int file_write(MigrationState *s, const void * buf, size_t size) |
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{ |
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return write(s->fd, buf, size);
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} |
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static int exec_close(MigrationState *s) |
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{ |
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int ret = 0; |
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DPRINTF("exec_close\n");
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if (s->opaque) {
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ret = qemu_fclose(s->opaque); |
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s->opaque = NULL;
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s->fd = -1;
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if (ret != -1 && |
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WIFEXITED(ret) |
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&& WEXITSTATUS(ret) == 0) {
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ret = 0;
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} else {
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ret = -1;
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} |
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} |
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return ret;
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} |
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int exec_start_outgoing_migration(MigrationState *s, const char *command) |
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{ |
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FILE *f; |
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f = popen(command, "w");
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if (f == NULL) { |
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DPRINTF("Unable to popen exec target\n");
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goto err_after_popen;
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} |
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s->fd = fileno(f); |
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if (s->fd == -1) { |
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DPRINTF("Unable to retrieve file descriptor for popen'd handle\n");
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goto err_after_open;
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} |
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socket_set_nonblock(s->fd); |
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s->opaque = qemu_popen(f, "w");
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s->close = exec_close; |
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s->get_error = file_errno; |
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s->write = file_write; |
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migrate_fd_connect(s); |
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return 0; |
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err_after_open:
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pclose(f); |
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err_after_popen:
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return -1; |
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} |
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static void exec_accept_incoming_migration(void *opaque) |
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{ |
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QEMUFile *f = opaque; |
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process_incoming_migration(f); |
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qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL); |
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qemu_fclose(f); |
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} |
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int exec_start_incoming_migration(const char *command) |
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{ |
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QEMUFile *f; |
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DPRINTF("Attempting to start an incoming migration\n");
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f = qemu_popen_cmd(command, "r");
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if(f == NULL) { |
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DPRINTF("Unable to apply qemu wrapper to popen file\n");
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return -errno;
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} |
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qemu_set_fd_handler2(qemu_stdio_fd(f), NULL,
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exec_accept_incoming_migration, NULL, f);
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return 0; |
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} |