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// Copyright 2018 Google Inc.
//
// 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
import (
"gvisor.googlesource.com/gvisor/pkg/bits"
)
const (
// SignalMaximum is the highest valid signal number.
SignalMaximum = 64
// FirstStdSignal is the lowest standard signal number.
FirstStdSignal = 1
// LastStdSignal is the highest standard signal number.
LastStdSignal = 31
// FirstRTSignal is the lowest real-time signal number.
//
// 32 (SIGCANCEL) and 33 (SIGSETXID) are used internally by glibc.
FirstRTSignal = 32
// LastRTSignal is the highest real-time signal number.
LastRTSignal = 64
// NumStdSignals is the number of standard signals.
NumStdSignals = LastStdSignal - FirstStdSignal + 1
// NumRTSignals is the number of realtime signals.
NumRTSignals = LastRTSignal - FirstRTSignal + 1
)
// Signal is a signal number.
type Signal int
// IsValid returns true if s is a valid standard or realtime signal. (0 is not
// considered valid; interfaces special-casing signal number 0 should check for
// 0 first before asserting validity.)
func (s Signal) IsValid() bool {
return s > 0 && s <= SignalMaximum
}
// IsStandard returns true if s is a standard signal.
//
// Preconditions: s.IsValid().
func (s Signal) IsStandard() bool {
return s <= LastStdSignal
}
// IsRealtime returns true if s is a realtime signal.
//
// Preconditions: s.IsValid().
func (s Signal) IsRealtime() bool {
return s >= FirstRTSignal
}
// Index returns the index for signal s into arrays of both standard and
// realtime signals (e.g. signal masks).
//
// Preconditions: s.IsValid().
func (s Signal) Index() int {
return int(s - 1)
}
// Signals.
const (
SIGABRT = Signal(6)
SIGALRM = Signal(14)
SIGBUS = Signal(7)
SIGCHLD = Signal(17)
SIGCLD = Signal(17)
SIGCONT = Signal(18)
SIGFPE = Signal(8)
SIGHUP = Signal(1)
SIGILL = Signal(4)
SIGINT = Signal(2)
SIGIO = Signal(29)
SIGIOT = Signal(6)
SIGKILL = Signal(9)
SIGPIPE = Signal(13)
SIGPOLL = Signal(29)
SIGPROF = Signal(27)
SIGPWR = Signal(30)
SIGQUIT = Signal(3)
SIGSEGV = Signal(11)
SIGSTKFLT = Signal(16)
SIGSTOP = Signal(19)
SIGSYS = Signal(31)
SIGTERM = Signal(15)
SIGTRAP = Signal(5)
SIGTSTP = Signal(20)
SIGTTIN = Signal(21)
SIGTTOU = Signal(22)
SIGUNUSED = Signal(31)
SIGURG = Signal(23)
SIGUSR1 = Signal(10)
SIGUSR2 = Signal(12)
SIGVTALRM = Signal(26)
SIGWINCH = Signal(28)
SIGXCPU = Signal(24)
SIGXFSZ = Signal(25)
)
// SignalSet is a signal mask with a bit corresponding to each signal.
type SignalSet uint64
// SignalSetSize is the size in bytes of a SignalSet.
const SignalSetSize = 8
// MakeSignalSet returns SignalSet with the bit corresponding to each of the
// given signals set.
func MakeSignalSet(sigs ...Signal) SignalSet {
indices := make([]int, len(sigs))
for i, sig := range sigs {
indices[i] = sig.Index()
}
return SignalSet(bits.Mask64(indices...))
}
// SignalSetOf returns a SignalSet with a single signal set.
func SignalSetOf(sig Signal) SignalSet {
return SignalSet(bits.MaskOf64(sig.Index()))
}
// ForEachSignal invokes f for each signal set in the given mask.
func ForEachSignal(mask SignalSet, f func(sig Signal)) {
bits.ForEachSetBit64(uint64(mask), func(i int) {
f(Signal(i + 1))
})
}
// 'how' values for rt_sigprocmask(2).
const (
// SIG_BLOCK blocks the signals in the set.
SIG_BLOCK = 0
// SIG_UNBLOCK blocks the signals in the set.
SIG_UNBLOCK = 1
// SIG_SETMASK sets the signal mask to set.
SIG_SETMASK = 2
)
// Signal actions for rt_sigaction(2), from uapi/asm-generic/signal-defs.h.
const (
// SIG_DFL performs the default action.
SIG_DFL = 0
// SIG_IGN ignores the signal.
SIG_IGN = 1
)
// Signal action flags for rt_sigaction(2), from uapi/asm-generic/signal.h
const (
SA_NOCLDSTOP = 0x00000001
SA_NOCLDWAIT = 0x00000002
SA_SIGINFO = 0x00000004
SA_ONSTACK = 0x08000000
SA_RESTART = 0x10000000
SA_NODEFER = 0x40000000
SA_RESTARTHAND = 0x80000000
SA_NOMASK = SA_NODEFER
SA_ONESHOT = SA_RESTARTHAND
)
// Signal info types.
const (
SI_MASK = 0xffff0000
SI_KILL = 0 << 16
SI_TIMER = 1 << 16
SI_POLL = 2 << 16
SI_FAULT = 3 << 16
SI_CHLD = 4 << 16
SI_RT = 5 << 16
SI_MESGQ = 6 << 16
SI_SYS = 7 << 16
)
// SIGPOLL si_codes.
const (
// POLL_IN indicates that data input available.
POLL_IN = SI_POLL | 1
// POLL_OUT indicates that output buffers available.
POLL_OUT = SI_POLL | 2
// POLL_MSG indicates that an input message available.
POLL_MSG = SI_POLL | 3
// POLL_ERR indicates that there was an i/o error.
POLL_ERR = SI_POLL | 4
// POLL_PRI indicates that a high priority input available.
POLL_PRI = SI_POLL | 5
// POLL_HUP indicates that a device disconnected.
POLL_HUP = SI_POLL | 6
)
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