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fs_epoll: [bug fix] EPOLL_CTL_ADD/MOD consider the teardown list too

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Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>
This commit is contained in:
wangbowen6 2022-11-25 18:56:53 +08:00 • committed by Xiang Xiao
parent 4075509579
commit 2f2176151e
1 changed files with 34 additions and 0 deletions
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34
fs/vfs/fs_epoll.c
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@ -418,6 +418,15 @@ int epoll_ctl(int epfd, int op, int fd, FAR struct epoll_event *ev)
}
}
list_for_every_entry(&eph->teardown, epn, epoll_node_t, node)
{
if (epn->pfd.fd == fd)
{
ret = -EEXIST;
goto err;
}
}
if (list_is_empty(&eph->free))
{
/* Malloc new epoll node, insert the first list_node to the
@ -508,6 +517,31 @@ int epoll_ctl(int epfd, int op, int fd, FAR struct epoll_event *ev)
}
}
goto out;
}
}
list_for_every_entry(&eph->teardown, epn, epoll_node_t, node)
{
if (epn->pfd.fd == fd)
{
if (epn->pfd.events != ev->events)
{
epn->data = ev->data;
epn->pfd.events = ev->events;
epn->pfd.fd = fd;
epn->pfd.revents = 0;
ret = poll_fdsetup(fd, &epn->pfd, true);
if (ret < 0)
{
goto err;
}
list_delete(&epn->node);
list_add_tail(&eph->setup, &epn->node);
}
break;
}
}