mirror of https://gitee.com/openkylin/qemu.git
122 lines
2.5 KiB
C
122 lines
2.5 KiB
C
/*
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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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}
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