// limitations under the License.

package app

import "golang.org/x/sys/unix"

func raiseFileLimits() (uint64, error) {
	rlimit := unix.Rlimit{}
	if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rlimit); err != nil {
		return 0, err
	}
	rlimit.Cur = rlimit.Max
	if err := unix.Setrlimit(unix.RLIMIT_NOFILE, &rlimit); err != nil {
		return 0, err
	}

	return rlimit.Cur, nil

type rlimit32 struct {
	Cur uint32
	Max uint32
}

//sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT

func Getrlimit(resource int, rlim *Rlimit) (err error) {
	err = prlimit(0, resource, nil, rlim)
	if err != ENOSYS {
		return err
	}

	rl := rlimit32{}
	err = getrlimit(resource, &rl)
	if err != nil {
		return
	}

	if rl.Cur == rlimInf32 {

// apply the same limit to DNS lookups run directly from Go, because
// there we will return a meaningful "too many open files" error.
func concurrentThreadsLimit() int {
	var rlim syscall.Rlimit
	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlim); err != nil {
		return 500
	}
	r := rlim.Cur
	if r > 500 {
		r = 500
	} else if r > 30 {
		r -= 30
	}
	return int(r)

type rlimit32 struct {
	Cur uint32
	Max uint32
}

//sysnb	getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT

const rlimInf32 = ^uint32(0)
const rlimInf64 = ^uint64(0)

func Getrlimit(resource int, rlim *Rlimit) (err error) {
	err = Prlimit(0, resource, nil, rlim)
	if err != ENOSYS {
		return err
	}

	rl := rlimit32{}
	err = getrlimit(resource, &rl)
	if err != nil {
		return
	}

	"regexp"
	"runtime"
	"syscall"
	"testing"
)

func canGenerateCore(t *testing.T) bool {
	// Ensure there is enough RLIMIT_CORE available to generate a full core.
	var lim syscall.Rlimit
	err := syscall.Getrlimit(syscall.RLIMIT_CORE, &lim)
	if err != nil {
		t.Fatalf("error getting rlimit: %v", err)
	}
	// Minimum RLIMIT_CORE max to allow. This is a conservative estimate.
	// Most systems allow infinity.

// Code that really wants Go to leave the limit alone can set the hard limit,
// which Go of course has no choice but to respect.
func init() {
	var lim Rlimit
	if err := Getrlimit(RLIMIT_NOFILE, &lim); err == nil && lim.Cur != lim.Max {
		origRlimitNofile.Store(&lim)
		nlim := lim
		nlim.Cur = nlim.Max
		adjustFileLimit(&nlim)
		setrlimit(RLIMIT_NOFILE, &nlim)
	}
}

type rlimit32 struct {
	Cur uint32
	Max uint32
}

//sysnb getrlimit(resource int, rlim *rlimit32) (err error) = SYS_GETRLIMIT

const rlimInf32 = ^uint32(0)
const rlimInf64 = ^uint64(0)

func Getrlimit(resource int, rlim *Rlimit) (err error) {
	err = prlimit(0, resource, nil, rlim)
	if err != ENOSYS {
		return err
	}

	rl := rlimit32{}
	err = getrlimit(resource, &rl)
	if err != nil {
		return
	}

// Copyright 2018 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.

//go:build aix && ppc64

package unix

//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error)
//sys	Seek(fd int, offset int64, whence int) (off int64, err error) = lseek

//sys	mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) = mmap64

		setNproc = false
	case "aix":
		nproc = 9
	case "linux":
		nproc = 6
	case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd":
		nproc = 7
	}
	if setNproc {
		var rlim syscall.Rlimit
		if syscall.Getrlimit(nproc, &rlim) == nil {
			max := int(rlim.Cur) / (threads + 5)
			if attempts > max {
				t.Logf("lowering attempts from %d to %d for RLIMIT_NPROC", attempts, max)
				attempts = max
			}
		}
	}

		NsecToTimespec(TimevalToNsec(tv[0])),
		NsecToTimespec(TimevalToNsec(tv[1])),
	}
	return utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
}

// Getrlimit prefers the prlimit64 system call.
func Getrlimit(resource int, rlim *Rlimit) error {
	return prlimit(0, resource, nil, rlim)
}

// setrlimit prefers the prlimit64 system call.
func setrlimit(resource int, rlim *Rlimit) error {