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// Copyright 2019 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package strace
import (
"fmt"
"strings"
"gvisor.dev/gvisor/pkg/abi"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/kernel"
slinux "gvisor.dev/gvisor/pkg/sentry/syscalls/linux"
"gvisor.dev/gvisor/pkg/sentry/usermem"
)
// PollEventSet is the set of poll(2) event flags.
var PollEventSet = abi.FlagSet{
{Flag: linux.POLLIN, Name: "POLLIN"},
{Flag: linux.POLLPRI, Name: "POLLPRI"},
{Flag: linux.POLLOUT, Name: "POLLOUT"},
{Flag: linux.POLLERR, Name: "POLLERR"},
{Flag: linux.POLLHUP, Name: "POLLHUP"},
{Flag: linux.POLLNVAL, Name: "POLLNVAL"},
{Flag: linux.POLLRDNORM, Name: "POLLRDNORM"},
{Flag: linux.POLLRDBAND, Name: "POLLRDBAND"},
{Flag: linux.POLLWRNORM, Name: "POLLWRNORM"},
{Flag: linux.POLLWRBAND, Name: "POLLWRBAND"},
{Flag: linux.POLLMSG, Name: "POLLMSG"},
{Flag: linux.POLLREMOVE, Name: "POLLREMOVE"},
{Flag: linux.POLLRDHUP, Name: "POLLRDHUP"},
{Flag: linux.POLLFREE, Name: "POLLFREE"},
{Flag: linux.POLL_BUSY_LOOP, Name: "POLL_BUSY_LOOP"},
}
func pollFD(t *kernel.Task, pfd *linux.PollFD, post bool) string {
revents := "..."
if post {
revents = PollEventSet.Parse(uint64(pfd.REvents))
}
return fmt.Sprintf("{FD: %s, Events: %s, REvents: %s}", fd(t, pfd.FD), PollEventSet.Parse(uint64(pfd.Events)), revents)
}
func pollFDs(t *kernel.Task, addr usermem.Addr, nfds uint, post bool) string {
if addr == 0 {
return "null"
}
pfds, err := slinux.CopyInPollFDs(t, addr, nfds)
if err != nil {
return fmt.Sprintf("%#x (error decoding pollfds: %s)", addr, err)
}
s := make([]string, 0, len(pfds))
for i := range pfds {
s = append(s, pollFD(t, &pfds[i], post))
}
return fmt.Sprintf("%#x [%s]", addr, strings.Join(s, ", "))
}
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