// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime

import "unsafe"

const (
	_EINTR  = 0x4
	_EFAULT = 0xe
	_EAGAIN = 0x23
	_ENOSYS = 0x4e

	_O_NONBLOCK = 0x4
	_O_CLOEXEC  = 0x10000

	_PROT_NONE  = 0x0
	_PROT_READ  = 0x1
	_PROT_WRITE = 0x2
	_PROT_EXEC  = 0x4

	_MAP_ANON    = 0x1000
	_MAP_PRIVATE = 0x2
	_MAP_FIXED   = 0x10
	_MAP_STACK   = 0x4000

	_MADV_FREE = 0x6

	_SA_SIGINFO = 0x40
	_SA_RESTART = 0x2
	_SA_ONSTACK = 0x1

	_SIGHUP    = 0x1
	_SIGINT    = 0x2
	_SIGQUIT   = 0x3
	_SIGILL    = 0x4
	_SIGTRAP   = 0x5
	_SIGABRT   = 0x6
	_SIGEMT    = 0x7
	_SIGFPE    = 0x8
	_SIGKILL   = 0x9
	_SIGBUS    = 0xa
	_SIGSEGV   = 0xb
	_SIGSYS    = 0xc
	_SIGPIPE   = 0xd
	_SIGALRM   = 0xe
	_SIGTERM   = 0xf
	_SIGURG    = 0x10
	_SIGSTOP   = 0x11
	_SIGTSTP   = 0x12
	_SIGCONT   = 0x13
	_SIGCHLD   = 0x14
	_SIGTTIN   = 0x15
	_SIGTTOU   = 0x16
	_SIGIO     = 0x17
	_SIGXCPU   = 0x18
	_SIGXFSZ   = 0x19
	_SIGVTALRM = 0x1a
	_SIGPROF   = 0x1b
	_SIGWINCH  = 0x1c
	_SIGINFO   = 0x1d
	_SIGUSR1   = 0x1e
	_SIGUSR2   = 0x1f

	_FPE_INTDIV = 0x1
	_FPE_INTOVF = 0x2
	_FPE_FLTDIV = 0x3
	_FPE_FLTOVF = 0x4
	_FPE_FLTUND = 0x5
	_FPE_FLTRES = 0x6
	_FPE_FLTINV = 0x7
	_FPE_FLTSUB = 0x8

	_BUS_ADRALN = 0x1
	_BUS_ADRERR = 0x2
	_BUS_OBJERR = 0x3

	_SEGV_MAPERR = 0x1
	_SEGV_ACCERR = 0x2

	_ITIMER_REAL    = 0x0
	_ITIMER_VIRTUAL = 0x1
	_ITIMER_PROF    = 0x2

	_EV_ADD       = 0x1
	_EV_DELETE    = 0x2
	_EV_CLEAR     = 0x20
	_EV_ERROR     = 0x4000
	_EV_EOF       = 0x8000
	_EVFILT_READ  = -0x1
	_EVFILT_WRITE = -0x2
)

type tforkt struct {
	tf_tcb   unsafe.Pointer
	tf_tid   *int32
	tf_stack uintptr
}

type sigcontext struct {
	__sc_unused int32
	sc_mask     int32
	sc_sp       uintptr
	sc_lr       uintptr
	sc_elr      uintptr
	sc_spsr     uintptr
	sc_x        [30]uintptr
	sc_cookie   int64
}

type siginfo struct {
	si_signo  int32
	si_code   int32
	si_errno  int32
	pad_cgo_0 [4]byte
	_data     [120]byte
}

type stackt struct {
	ss_sp     uintptr
	ss_size   uintptr
	ss_flags  int32
	pad_cgo_0 [4]byte
}

type timespec struct {
	tv_sec  int64
	tv_nsec int64
}

//go:nosplit
func (ts *timespec) setNsec(ns int64) {
	ts.tv_sec = ns / 1e9
	ts.tv_nsec = ns % 1e9
}

type timeval struct {
	tv_sec  int64
	tv_usec int64
}

func (tv *timeval) set_usec(x int32) {
	tv.tv_usec = int64(x)
}

type itimerval struct {
	it_interval timeval
	it_value    timeval
}

type keventt struct {
	ident  uint64
	filter int16
	flags  uint16
	fflags uint32
	data   int64
	udata  *byte
}