criu/include/files.h

#ifndef FILES_H_
#define FILES_H_

extern int prepare_fds(int pid);
extern int prepare_fd_pid(int pid);
extern int prepare_fdinfo_global(void);
extern int try_fixup_file_map(int pid, struct vma_entry *vma_entry, int fd);

#endif /* FILES_H_ */
restore: move file-related stuff to a separate file Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> 2012-01-10 18:03:00 +04:00			`#ifndef FILES_H_`
			`#define FILES_H_`

			`extern int prepare_fds(int pid);`
restore: Learn to work with shared struct file-s Some process can share one struct file-s, we may find them by "object IDs". A file descriptor is opened in one process and send to other via unix socket. The procedure of restoring files contains four stages. * Collect data about all file's descriptors On this stage we find process which will restore a file descriptor and create a list of processes, who should get this descriptor. * Create datagrams unix sockets If a file descriptor should be received, a unix socket is created instead of it. * Open file descriptors A process with the least pid opens a file and sends this file descriptors to all one who wait it. * Receive file descriptors. When we were thinking up this algoritm, we wanted to minimize a number of context switches. A number of context switches is proportional of a number of processes. Signed-off-by: Andrey Vagin <avagin@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> 2012-01-11 15:45:00 +04:00			`extern int prepare_fd_pid(int pid);`
			`extern int prepare_fdinfo_global(void);`
restore: move file-related stuff to a separate file Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> 2012-01-10 18:03:00 +04:00			`extern int try_fixup_file_map(int pid, struct vma_entry *vma_entry, int fd);`

			`#endif /* FILES_H_ */`