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eventpoll.c
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eventpoll.c
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#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/epoll.h>
#include "compiler.h"
#include "asm/types.h"
#include "imgset.h"
#include "rst_info.h"
#include "eventpoll.h"
#include "proc_parse.h"
#include "image.h"
#include "util.h"
#include "log.h"
#include "protobuf.h"
#include "protobuf/eventpoll.pb-c.h"
#undef LOG_PREFIX
#define LOG_PREFIX "epoll: "
struct eventpoll_file_info {
EventpollFileEntry *efe;
struct file_desc d;
};
struct eventpoll_tfd_file_info {
EventpollTfdEntry *tdefe;
struct list_head list;
};
static LIST_HEAD(eventpoll_tfds);
/* Checks if file descriptor @lfd is eventfd */
int is_eventpoll_link(char *link)
{
return is_anon_link_type(link, "[eventpoll]");
}
static void pr_info_eventpoll_tfd(char *action, EventpollTfdEntry *e)
{
pr_info("%seventpoll-tfd: id %#08x tfd %#08x events %#08x data %#016"PRIx64"\n",
action, e->id, e->tfd, e->events, e->data);
}
static void pr_info_eventpoll(char *action, EventpollFileEntry *e)
{
pr_info("%seventpoll: id %#08x flags %#04x\n", action, e->id, e->flags);
}
struct eventpoll_list {
struct list_head list;
int n;
};
static int dump_eventpoll_entry(union fdinfo_entries *e, void *arg)
{
struct eventpoll_list *ep_list = (struct eventpoll_list *) arg;
EventpollTfdEntry *efd = &e->epl.e;
pr_info_eventpoll_tfd("Dumping: ", efd);
list_add_tail(&e->epl.node, &ep_list->list);
ep_list->n++;
return 0;
}
static int dump_one_eventpoll(int lfd, u32 id, const struct fd_parms *p)
{
EventpollFileEntry e = EVENTPOLL_FILE_ENTRY__INIT;
struct eventpoll_list ep_list = {LIST_HEAD_INIT(ep_list.list), 0};
union fdinfo_entries *te, *tmp;
int i, ret = -1;
e.id = id;
e.flags = p->flags;
e.fown = (FownEntry *)&p->fown;
if (parse_fdinfo(lfd, FD_TYPES__EVENTPOLL, dump_eventpoll_entry, &ep_list))
goto out;
e.tfd = xmalloc(sizeof(struct EventpollTfdEntry *) * ep_list.n);
if (!e.tfd)
goto out;
i = 0;
list_for_each_entry(te, &ep_list.list, epl.node)
e.tfd[i++] = &te->epl.e;
e.n_tfd = ep_list.n;
pr_info_eventpoll("Dumping ", &e);
ret = pb_write_one(img_from_set(glob_imgset, CR_FD_EVENTPOLL_FILE),
&e, PB_EVENTPOLL_FILE);
out:
list_for_each_entry_safe(te, tmp, &ep_list.list, epl.node)
free_event_poll_entry(te);
return ret;
}
const struct fdtype_ops eventpoll_dump_ops = {
.type = FD_TYPES__EVENTPOLL,
.dump = dump_one_eventpoll,
};
static int eventpoll_open(struct file_desc *d)
{
struct eventpoll_file_info *info;
int tmp;
info = container_of(d, struct eventpoll_file_info, d);
pr_info_eventpoll("Restore ", info->efe);
tmp = epoll_create(1);
if (tmp < 0) {
pr_perror("Can't create epoll %#08x",
info->efe->id);
return -1;
}
if (rst_file_params(tmp, info->efe->fown, info->efe->flags)) {
pr_perror("Can't restore file params on epoll %#08x",
info->efe->id);
goto err_close;
}
return tmp;
err_close:
close(tmp);
return -1;
}
static int eventpoll_retore_tfd(int fd, int id, EventpollTfdEntry *tdefe)
{
struct epoll_event event;
pr_info_eventpoll_tfd("Restore ", tdefe);
event.events = tdefe->events;
event.data.u64 = tdefe->data;
if (epoll_ctl(fd, EPOLL_CTL_ADD, tdefe->tfd, &event)) {
pr_perror("Can't add event on %#08x", id);
return -1;
}
return 0;
}
static int eventpoll_post_open(struct file_desc *d, int fd)
{
struct eventpoll_tfd_file_info *td_info;
struct eventpoll_file_info *info;
int i;
info = container_of(d, struct eventpoll_file_info, d);
for (i = 0; i < info->efe->n_tfd; i++) {
if (eventpoll_retore_tfd(fd, info->efe->id, info->efe->tfd[i]))
return -1;
}
list_for_each_entry(td_info, &eventpoll_tfds, list) {
if (td_info->tdefe->id != info->efe->id)
continue;
if (eventpoll_retore_tfd(fd, info->efe->id, td_info->tdefe))
return -1;
}
return 0;
}
static void eventpoll_collect_fd(struct file_desc *d,
struct fdinfo_list_entry *fle, struct rst_info *ri)
{
list_add_tail(&fle->ps_list, &ri->eventpoll);
}
static struct file_desc_ops desc_ops = {
.type = FD_TYPES__EVENTPOLL,
.open = eventpoll_open,
.post_open = eventpoll_post_open,
.collect_fd = eventpoll_collect_fd,
};
static int collect_one_epoll_tfd(void *o, ProtobufCMessage *msg)
{
struct eventpoll_tfd_file_info *info = o;
info->tdefe = pb_msg(msg, EventpollTfdEntry);
list_add(&info->list, &eventpoll_tfds);
pr_info_eventpoll_tfd("Collected ", info->tdefe);
return 0;
}
struct collect_image_info epoll_tfd_cinfo = {
.fd_type = CR_FD_EVENTPOLL_TFD,
.pb_type = PB_EVENTPOLL_TFD,
.priv_size = sizeof(struct eventpoll_tfd_file_info),
.collect = collect_one_epoll_tfd,
};
static int collect_one_epoll(void *o, ProtobufCMessage *msg)
{
struct eventpoll_file_info *info = o;
info->efe = pb_msg(msg, EventpollFileEntry);
pr_info_eventpoll("Collected ", info->efe);
return file_desc_add(&info->d, info->efe->id, &desc_ops);
}
struct collect_image_info epoll_cinfo = {
.fd_type = CR_FD_EVENTPOLL_FILE,
.pb_type = PB_EVENTPOLL_FILE,
.priv_size = sizeof(struct eventpoll_file_info),
.collect = collect_one_epoll,
};