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|
package container
import (
"context"
"net"
"syscall"
"github.com/containerd/log"
"github.com/docker/docker/internal/unix_noeintr"
"golang.org/x/sys/unix"
)
func notifyClosed(ctx context.Context, conn net.Conn, notify func()) {
sc, ok := conn.(syscall.Conn)
if !ok {
log.G(ctx).Debug("notifyClosed: conn does not support close notifications")
return
}
rc, err := sc.SyscallConn()
if err != nil {
log.G(ctx).WithError(err).Warn("notifyClosed: failed get raw conn for close notifications")
return
}
epFd, err := unix_noeintr.EpollCreate()
if err != nil {
log.G(ctx).WithError(err).Warn("notifyClosed: failed to create epoll fd")
return
}
defer unix.Close(epFd)
err = rc.Control(func(fd uintptr) {
err := unix_noeintr.EpollCtl(epFd, unix.EPOLL_CTL_ADD, int(fd), &unix.EpollEvent{
Events: unix.EPOLLHUP,
Fd: int32(fd),
})
if err != nil {
log.G(ctx).WithError(err).Warn("notifyClosed: failed to register fd for close notifications")
return
}
events := make([]unix.EpollEvent, 1)
if _, err := unix_noeintr.EpollWait(epFd, events, -1); err != nil {
log.G(ctx).WithError(err).Warn("notifyClosed: failed to wait for close notifications")
return
}
notify()
})
if err != nil {
log.G(ctx).WithError(err).Warn("notifyClosed: failed to register for close notifications")
return
}
}
|
