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eventfd.c
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eventfd.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/eventfd.h>
#include "compiler.h"
#include "asm/types.h"
#include "fdset.h"
#include "eventfd.h"
#include "proc_parse.h"
#include "image.h"
#include "util.h"
#include "log.h"
#include "protobuf.h"
#include "protobuf/eventfd.pb-c.h"
#undef LOG_PREFIX
#define LOG_PREFIX "eventfd: "
struct eventfd_file_info {
EventfdFileEntry *efe;
struct file_desc d;
};
/* Checks if file descriptor @lfd is eventfd */
int is_eventfd_link(int lfd)
{
return is_anon_link_type(lfd, "[eventfd]");
}
static void pr_info_eventfd(char *action, EventfdFileEntry *efe)
{
pr_info("%s: id %#08x flags %#04x counter %#016"PRIx64"\n",
action, efe->id, efe->flags, efe->counter);
}
struct eventfd_dump_arg {
u32 id;
const struct fd_parms *p;
bool dumped;
};
static int dump_eventfd_entry(union fdinfo_entries *e, void *arg)
{
struct eventfd_dump_arg *da = arg;
if (da->dumped) {
pr_err("Several counters in a file?\n");
return -1;
}
da->dumped = true;
e->efd.id = da->id;
e->efd.flags = da->p->flags;
e->efd.fown = (FownEntry *)&da->p->fown;
pr_info_eventfd("Dumping ", &e->efd);
return pb_write_one(fdset_fd(glob_fdset, CR_FD_EVENTFD_FILE),
&e->efd, PB_EVENTFD_FILE);
}
static int dump_one_eventfd(int lfd, u32 id, const struct fd_parms *p)
{
struct eventfd_dump_arg da = { .id = id, .p = p, };
return parse_fdinfo(lfd, FD_TYPES__EVENTFD, dump_eventfd_entry, &da);
}
const struct fdtype_ops eventfd_dump_ops = {
.type = FD_TYPES__EVENTFD,
.dump = dump_one_eventfd,
};
static int eventfd_open(struct file_desc *d)
{
struct eventfd_file_info *info;
int tmp;
info = container_of(d, struct eventfd_file_info, d);
tmp = eventfd(info->efe->counter, 0);
if (tmp < 0) {
pr_perror("Can't create eventfd %#08x",
info->efe->id);
return -1;
}
if (rst_file_params(tmp, info->efe->fown, info->efe->flags)) {
pr_perror("Can't restore params on eventfd %#08x",
info->efe->id);
goto err_close;
}
return tmp;
err_close:
close(tmp);
return -1;
}
static struct file_desc_ops eventfd_desc_ops = {
.type = FD_TYPES__EVENTFD,
.open = eventfd_open,
};
static int collect_one_efd(void *obj, ProtobufCMessage *msg)
{
struct eventfd_file_info *info = obj;
info->efe = pb_msg(msg, EventfdFileEntry);
pr_info_eventfd("Collected ", info->efe);
return file_desc_add(&info->d, info->efe->id, &eventfd_desc_ops);
}
struct collect_image_info eventfd_cinfo = {
.fd_type = CR_FD_EVENTFD_FILE,
.pb_type = PB_EVENTFD_FILE,
.priv_size = sizeof(struct eventfd_file_info),
.collect = collect_one_efd,
};