mir/criu
2
0
Fork 0
mirror of https://github.com/checkpoint-restore/criu synced 2025-08-23 10:28:05 +00:00
Code Issues Releases Wiki Activity
criu/include/sockets.h

39 lines
845 B
C
Raw Normal View History

net: A few changes in headres to follow c99 Since we're not system library - no underscopes in functions name until really needed and known to not clash with posix namespace - empty line between system headers and own headers for readability - extern for function prototypes Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 14:24:47 +04:00
#ifndef CR_SOCKETS_H__
#define CR_SOCKETS_H__
Use openat() helper intensively when opening /proc/pid/X files This allows us to get rid of open-coded "/proc/pid/X". Based-on-patch-from: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com>
2012-01-12 23:50:45 +04:00
#include <sys/types.h>
#include <unistd.h>
net: A few changes in headres to follow c99 Since we're not system library - no underscopes in functions name until really needed and known to not clash with posix namespace - empty line between system headers and own headers for readability - extern for function prototypes Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 14:24:47 +04:00
#include <stdbool.h>
parasite: support sockets queues This patch adds sockets queue dump functionality. Key ideas 1) sockets info is passed as plain array in parasite args. 2) new socket option SO_PEEK_OFF with MSG_PEEK is used to read the get the queue's packets. 3) Buffer for packet will be allocated for each socket separately and with size of socket sending buffer. For stream sockets is means, that it's queue will be dumped in chunks of this size. Note: loop around sys_msgrcv() is required for DGRAM sockets - sys_msgrcv() with MSG_PEEK will return only one packet. Based on xemul@ patches. Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2012-02-29 16:06:40 +03:00
struct sk_queue_item {
int fd;
int type;
unsigned int sk_id;
};
dump: socket queues support This patch was designed to be generic and thus usable for all kinds of sockets. Not sure, thah this goal has been reached, but at least I tried. Key ideas: 1) On-stack structure for collecting sockets queues and then passing them to parasite code. 2) Singly linked list is used for collecting structures, representing sockets of any kind (!) with queues. Based on xemul@ patches. Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2012-02-29 16:06:48 +03:00
struct sk_queue_entry {
struct sk_queue_item item;
struct sk_queue_entry *next;
};
struct sk_queue {
unsigned int entries;
struct sk_queue_entry *list;
};
Unix sockets initial support Currently it can only work with stream sockets, which have no skbs in queues (listening or established -- both work OK). The cpt part uses the sock_diag engine that was merged to Dave recently to collect sockets. Then it dumps sockets by checking the filesystem ID of a failed-to-open through /proc/pid/fd descriptors (sockets do not allow for such tricks with opens through proc) against SOCKFS_TYPE. The rst part is more tricky. Listen sockets are just restored, this is simple. Connected sockets are restored like this: 1. One end establishes a listening anon socket at the desired descriptor; 2. The other end just creates a socket at the desired descriptor; 3. All sockets, that are to be connect()-ed call connect. Unix sockets do not block connect() till the accept() time and thus we continue with... 4. ... all listening sockets call accept() and ... dup2 the new fd into the accepting end. There's a problem with this approach -- socket names are not preserved, but looking into our OpenVZ implementation I think this is OK for existing apps. What should be done next is: 1. Need to merge the file IDs patches in our tree and make Andrey to support files sharing. This will solve the sk = socket(); fork(); case. Currently it simply doesn't work :( 2. Need to add support for DGRAM sockets -- I wrote comment how to do it in the can_dump_unix_sk() 3. Need to add support for in-flight connections 4. Implement support for UDP sockets (quite simple) 5. Implement support for listening TCP sockets (also not very complex) 6. Implement support for connected TCP scokets (hard one, Tejun's patches are not very good for this from my POV) Cyrill, plz, apply this patch and put the above descriptions onto wiki docs (do we have the plans page yet?). Andrey, plz, take care of unix sockets tests in zdtm. Most likely it won't work till you do the shared files support for sockets. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-26 22:12:03 +04:00
struct cr_fdset;
sockets: Remove statfs and 2nd stat from dump process The statfs is not required, we now check for fd being a socket with S_IFSOCK. The 2nd stat is just not needed, the caller provides stat info. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-03-29 16:40:10 +04:00
struct fd_parms;
extern int dump_socket(struct fd_parms *p, int lfd,
const struct cr_fdset *cr_fdset, struct sk_queue *queue);
net: A few changes in headres to follow c99 Since we're not system library - no underscopes in functions name until really needed and known to not clash with posix namespace - empty line between system headers and own headers for readability - extern for function prototypes Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 14:24:47 +04:00
extern int collect_sockets(void);
extern int prepare_sockets(int pid);
inet: Rework inet sk dumping on new fdinfo scheme Now every inetsk fd dump results in a new entry in the fdinfo.img file. Sockets itself are dumped into inetsk.img global image file. On restore the generic fdinfo redistribution algo is used and inet sockets are opened only when required. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-03-27 12:42:59 +04:00
struct fdinfo_entry;
extern int open_inet_sk(struct fdinfo_entry *fe);
show: Introduce ->show callback for fdset Each fdset item now has the callback which will show a contents of a magic-described image file. Per-task and global show code is reworked to walk the respective fdsets and calling ->show on each file. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-03-27 12:01:14 +04:00
struct cr_options;
extern void show_unixsk(int fd, struct cr_options *);
extern void show_inetsk(int fd, struct cr_options *);
extern void show_sk_queues(int fd, struct cr_options *);
net: A few changes in headres to follow c99 Since we're not system library - no underscopes in functions name until really needed and known to not clash with posix namespace - empty line between system headers and own headers for readability - extern for function prototypes Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2011-12-27 14:24:47 +04:00
#endif /* CR_SOCKETS_H__ */
Reference in New Issue Copy Permalink