diff options
| author | Adin Scannell <ascannell@google.com> | 2019-09-18 15:15:16 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-09-18 15:16:42 -0700 |
| commit | c98e7f0d19478ca57ba8c96444f225784035321e (patch) | |
| tree | 2755f7aa518531cdf79ad334dbfb14daa3375521 /pkg/abi/linux | |
| parent | 461123ea3510a401423181e8ea8f2cae27fcbc8f (diff) | |
Signalfd support
Note that the exact semantics for these signalfds are slightly different from
Linux. These signalfds are bound to the process at creation time. Reads, polls,
etc. are all associated with signals directed at that task. In Linux, all
signalfd operations are associated with current, regardless of where the
signalfd originated.
In practice, this should not be an issue given how signalfds are used. In order
to fix this however, we will need to plumb the context through all the event
APIs. This gets complicated really quickly, because the waiter APIs are all
netstack-specific, and not generally exposed to the context. Probably not
worthwhile fixing immediately.
PiperOrigin-RevId: 269901749
Diffstat (limited to 'pkg/abi/linux')
| -rw-r--r-- | pkg/abi/linux/BUILD | 1 | ||||
| -rw-r--r-- | pkg/abi/linux/signalfd.go | 45 |
2 files changed, 46 insertions, 0 deletions
diff --git a/pkg/abi/linux/BUILD b/pkg/abi/linux/BUILD index 39c92bb33..f45934466 100644 --- a/pkg/abi/linux/BUILD +++ b/pkg/abi/linux/BUILD @@ -46,6 +46,7 @@ go_library( "sem.go", "shm.go", "signal.go", + "signalfd.go", "socket.go", "splice.go", "tcp.go", diff --git a/pkg/abi/linux/signalfd.go b/pkg/abi/linux/signalfd.go new file mode 100644 index 000000000..85fad9956 --- /dev/null +++ b/pkg/abi/linux/signalfd.go @@ -0,0 +1,45 @@ +// 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 linux + +const ( + // SFD_NONBLOCK is a signalfd(2) flag. + SFD_NONBLOCK = 00004000 + + // SFD_CLOEXEC is a signalfd(2) flag. + SFD_CLOEXEC = 02000000 +) + +// SignalfdSiginfo is the siginfo encoding for signalfds. +type SignalfdSiginfo struct { + Signo uint32 + Errno int32 + Code int32 + PID uint32 + UID uint32 + FD int32 + TID uint32 + Band uint32 + Overrun uint32 + TrapNo uint32 + Status int32 + Int int32 + Ptr uint64 + UTime uint64 + STime uint64 + Addr uint64 + AddrLSB uint16 + _ [48]uint8 +} |