Saied Kazemi 0412152fc5 Add inherit fd support ... There are cases where a process's file descriptor cannot be restored from the checkpoint images. For example, a pipe file descriptor with one end in the checkpointed process and the other end in a separate process (that was not part of the checkpointed process tree) cannot be restored because after checkpoint the pipe will be broken. There are also cases where the user wants to use a new file during restore instead of the original file at checkpoint time. For example, the user wants to change the log file of a process from /path/to/oldlog to /path/to/newlog. In these cases, criu's caller should set up a new file descriptor to be inherited by the restored process and specify the file descriptor with the --inherit-fd command line option. The argument of --inherit-fd has the format fd[%d]:%s, where %d tells criu which of its own file descriptors to use for restoring the file identified by %s. As a debugging aid, if the argument has the format debug[%d]:%s, it tells criu to write out the string after colon to the file descriptor %d. This can be used, for example, as an easy way to leave a "restore marker" in the output stream of the process. It's important to note that inherit fd support breaks applications that depend on the state of the file descriptor being inherited. So, consider inherit fd only for specific use cases that you know for sure won't break the application. For examples please visit http://criu.org/Category:HOWTO. v2: Added a check in send_fd_to_self() to avoid closing an inherit fd. Also, as an extra measure of caution, added checks in the inherit fd look up functions to make sure that the inherit fd hasn't been reused. The patch also includes minor cosmetic changes. Signed-off-by: Saied Kazemi <saied@google.com> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>		2014-12-10 12:48:30 +03:00
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asm-generic	cr: collect short integer aliases in the single place	2014-04-08 15:35:46 +04:00
action-scripts.h	scripts: Add ACT_MAX limit and make @action_names being const	2014-10-27 21:30:37 +04:00
bfd.h	bfd: Don't flush read-only images	2014-11-05 15:38:17 +04:00
bug.h	bug: Include <stdbool.h>	2014-02-21 16:27:16 +04:00
cgroup.h	cg: add --cgroup-root option	2014-08-19 12:58:36 +04:00
compiler.h	include/compiler.h: Cleanup	2013-02-15 17:34:38 +04:00
config-base.h	config-base: Add F_SETPIPE_SZ/F_GETPIPE_SZ	2014-02-18 12:53:09 +04:00
cpu.h	cpuinfo: Add "cpuinfo [dump|check]" commands, v2	2014-10-03 13:26:58 +04:00
cr-service-const.h	service: move constants to cr-service-const.h	2013-12-18 14:26:10 +04:00
cr-service.h	scripts: Use numeric action val in RPC notifications	2014-09-05 13:48:27 +04:00
cr-show.h	img: Introduce the struct cr_img	2014-09-30 21:48:13 +04:00
cr_options.h	Add inherit fd support	2014-12-10 12:48:30 +03:00
criu-log.h	log: Add pr_warn_once helper	2014-02-28 13:34:29 +04:00
criu-plugin.h	plugin: Explicit assign plugin hooks	2014-09-19 17:39:06 +04:00
crtools.h	dump: get tasks ids from parasite	2014-11-07 17:14:32 +04:00
err.h	headers: Add err.h header	2013-04-02 20:27:51 +04:00
errno.h	headers: Move ERESTART codes to errno.h	2013-11-14 22:22:21 +04:00
eventfd.h	anon-inode: Don't readlink fd/fd multiple times	2014-02-02 22:14:29 +04:00
eventpoll.h	anon-inode: Don't readlink fd/fd multiple times	2014-02-02 22:14:29 +04:00
fcntl.h	fsnotify: Open handle with O_PATH, v2	2014-02-25 23:38:35 +04:00
fifo.h	img: Rename fdset -> imgset	2014-09-30 21:48:10 +04:00
file-ids.h	files-ids: generate id-s accoding with mnt_id, st->st_dev and st->st_ino	2014-04-21 22:39:28 +04:00
file-lock.h	locks: Don't dump locks in per-task manner (v3)	2014-09-02 17:44:46 +04:00
files-reg.h	files-reg: Add try_collect_special_file	2014-10-23 17:51:49 +04:00
files.h	Add inherit fd support	2014-12-10 12:48:30 +03:00
fs-magic.h	remap: add a dead pid /proc remap	2014-09-19 17:42:48 +04:00
fsnotify.h	fsnotify: merge fanotify mark image into fanotify image (v3)	2014-09-03 20:51:39 +04:00
image-desc.h	criu: add constants about user namespaces	2014-11-07 17:00:32 +04:00
image.h	img: Prepare to use bfd engine	2014-09-30 21:48:53 +04:00
imgset.h	img: Introduce the struct cr_img	2014-09-30 21:48:13 +04:00
inet_diag.h	headers: Unify include guards (in comments) and a few fixes	2012-12-25 22:40:24 +04:00
ipc_ns.h	ns: Factor out namespace switching call	2014-09-30 21:54:11 +04:00
irmap.h	irmap: Get root mntfd before releasing tasks on predump	2014-10-01 09:37:04 +04:00
kcmp-ids.h	headers: Add extern specificator to functions	2013-11-15 17:00:58 +04:00
kcmp.h	headers: Move kcmp_type to kcmp.h	2013-11-14 22:13:59 +04:00
kerndat.h	tcp: don't split packets for restoring a send queue	2014-12-08 15:46:44 +03:00
libnetlink.h	headers: Unify include guards (in comments) and a few fixes	2012-12-25 22:40:24 +04:00
list.h	criu: Several formatting fixes	2014-01-14 09:33:19 +04:00
lock.h	atomic: Use atomic_read instead of atomic_get	2013-08-16 19:37:06 +04:00
log.h	img: Introduce the struct cr_img	2014-09-30 21:48:13 +04:00
magic.h	criu: add constants about user namespaces	2014-11-07 17:00:32 +04:00
mem.h	mem: Move shmem preparation routine and rename	2014-02-03 23:34:12 +04:00
mman.h	headers: Move MADV definitions to own mman.h	2013-11-14 22:48:30 +04:00
mount.h	img: Rename fdset -> imgset	2014-09-30 21:48:10 +04:00
namespaces.h	ns: Rename "created" futex and comment what it is	2014-11-11 20:11:58 +04:00
net.h	predump: Collect mnt and net namespaces properly	2014-10-02 14:30:31 +04:00
netfilter.h	headers: Add extern specificator to functions	2013-11-15 17:00:58 +04:00
netlink_diag.h	headers: Add missing __CR_ at last endif	2013-11-15 16:59:57 +04:00
packet_diag.h	headers: Unify include guards (in comments) and a few fixes	2012-12-25 22:40:24 +04:00
page-pipe.h	page-pipe: split dumping memory on chunks (v3)	2014-02-10 15:06:39 +04:00
page-read.h	img: Introduce the struct cr_img	2014-09-30 21:48:13 +04:00
page-xfer.h	mem: check existence of parent images before dumping pages (v2)	2014-11-29 19:32:40 +03:00
pagemap-cache.h	pagemap-cache: Use page.h helpers	2014-02-21 16:29:41 +04:00
parasite-syscall.h	parasite: Cleanup args size fetching	2014-11-11 20:11:34 +04:00
parasite.h	dump: get tasks ids from parasite	2014-11-07 17:14:32 +04:00
pid.h	headers: Add missing __CR_ at last endif	2013-11-15 16:59:57 +04:00
pipes.h	collect: Shorten common images collecting code	2013-08-21 03:52:18 +04:00
plugin.h	plugin: Rework plugins API, v2	2014-09-03 20:48:36 +04:00
posix-timer.h	posix-timers: Helper for freeing proc parsed data	2014-04-17 12:01:02 +04:00
prctl.h	prctl: Add new interface constants	2014-10-27 21:25:25 +04:00
proc_parse.h	proc: delete parse_pid_stat_small() (v2)	2014-11-07 17:15:37 +04:00
protobuf-desc.h	criu: add constants about user namespaces	2014-11-07 17:00:32 +04:00
protobuf.h	img: Introduce the struct cr_img	2014-09-30 21:48:13 +04:00
pstree.h	pstree: Add helper for adding helpers to pstree	2014-10-14 18:02:36 +04:00
ptrace.h	dump: remove useless arguments from seize_task()	2014-11-07 17:14:54 +04:00
rbtree.h	x86: moved x86-specific files into the directory arch/x86.	2013-01-09 17:02:47 +04:00
restorer.h	restore: use breakpoints instead of tracing syscalls	2014-09-19 17:57:18 +04:00
rst-malloc.h	whitespace-at-eol cleanup	2013-12-12 10:00:45 +04:00
rst_info.h	restore: use breakpoints instead of tracing syscalls	2014-09-19 17:57:18 +04:00
servicefd.h	cg: Restore tasks into proper cgroups	2014-05-27 23:48:06 +04:00
setproctitle.h	crtools: check for setproctitle_init	2014-09-02 16:14:39 +04:00
shmem.h	shmem: rework getting file descriptors for shared memory regions (v2)	2014-10-23 19:57:12 +04:00
sigframe.h	parasite: don't include restorer.h in parasite-syscall.c	2013-11-06 12:39:36 +04:00
signalfd.h	img: Rename fdset -> imgset	2014-09-30 21:48:10 +04:00
sk-inet.h	headers: Add extern specificator to functions	2013-11-15 17:00:58 +04:00
sk-packet.h	img: Rename fdset -> imgset	2014-09-30 21:48:10 +04:00
sk-queue.h	crtools: move all stuff about vma together	2013-11-06 12:43:49 +04:00
sockets.h	dump: pre-load kernel modules	2014-10-14 14:21:05 +04:00
stats.h	stats: Fix restore pages stats	2014-02-04 14:03:10 +04:00
string.h	make: config -- Add testing if we have libbsd installed	2014-03-26 01:44:23 +04:00
syscall-types.h	namespaces: take into account USERNS id	2014-10-30 16:00:33 +04:00
sysctl.h	add int(CTL_32)	2014-10-08 19:23:24 +04:00
sysfs_parse.h	Added AUFS support.	2014-08-21 18:35:22 +04:00
timerfd.h	timerfd: Implement check routine	2014-08-07 10:18:09 +04:00
tty.h	tty: Add support of /dev/console	2014-10-27 21:35:39 +04:00
tun.h	img: Rename fdset -> imgset	2014-09-30 21:48:10 +04:00
unix_diag.h	x86: moved x86-specific files into the directory arch/x86.	2013-01-09 17:02:47 +04:00
util-pie.h	headers: Drop uintX_t usage	2013-12-12 10:03:07 +04:00
util.h	util: Fix the ispathsub corner case	2014-11-09 23:26:56 +04:00
uts_ns.h	ns: Factor out namespace switching call	2014-09-30 21:54:11 +04:00
vdso.h	vdso: Implement vDSO proxification of any vvar/vdso order	2014-08-04 15:35:03 +04:00
vma.h	filemap: Get vma mnt_id early	2014-09-29 13:20:55 +04:00
xmalloc.h	core: Allocate CoreEntry (except arch) with single xmalloc	2014-03-14 13:39:28 +04:00