package unix

import (
	"unsafe"
)

// Helpers for dealing with ifreq since it contains a union and thus requires a
// lot of unsafe.Pointer casts to use properly.

// An Ifreq is a type-safe wrapper around the raw ifreq struct. An Ifreq
// contains an interface name and a union of arbitrary data which can be
// accessed using the Ifreq's methods. To create an Ifreq, use the NewIfreq
// function.
//

	return ByteSliceToString(value[:]), err
}

// IoctlIfreq performs an ioctl using an Ifreq structure for input and/or
// output. See the netdevice(7) man page for details.
func IoctlIfreq(fd int, req uint, value *Ifreq) error {
	// It is possible we will add more fields to *Ifreq itself later to prevent
	// misuse, so pass the raw *ifreq directly.
	return ioctlPtr(fd, req, unsafe.Pointer(&value.raw))
}

	"syscall"
	"unsafe"
)

type rawSockaddrDatalink struct {
	Len    uint8
	Family uint8
	Index  uint16
	Type   uint8
	Nlen   uint8
	Alen   uint8
	Slen   uint8
	Data   [120]byte
}

type ifreq struct {
	Name [16]uint8
	Ifru [16]byte
}

const _KINFO_RT_IFLIST = (0x1 << 8) | 3 | (1 << 30)

const _RTAX_NETMASK = 2
const _RTAX_IFA = 5
const _RTAX_MAX = 8

func getIfList() ([]byte, error) {

		// We initialize the levels as if we had already figured this out.
		levels[level] = levelInfo{
			level:        level,
			lastFreq:     list[1].freq,
			nextCharFreq: list[2].freq,
			nextPairFreq: list[0].freq + list[1].freq,
		}
		leafCounts[level][level] = 2
		if level == 1 {
			levels[level].nextPairFreq = math.MaxInt32
		}
	}

EventBatch gen=1 m=0 time=0 size=15
ProcStatus dt=1 p=0 pstatus=1
GoStatus dt=1 g=1 m=0 gstatus=2
UserTaskBegin dt=1 task=2 parent_task=0 name_string=1 stack=0
EventBatch gen=1 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=18446744073709551615 time=0 size=1
Stacks
EventBatch gen=1 m=18446744073709551615 time=0 size=11
Strings
String id=1
	data="my task"
EventBatch gen=2 m=0 time=5 size=13

GoStop dt=1 reason_string=1 stack=0
EventBatch gen=1 m=1 time=0 size=12
ProcStatus dt=1 p=1 pstatus=1
GoStart dt=1 g=1 g_seq=1
GoStop dt=1 reason_string=1 stack=0
EventBatch gen=1 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=18446744073709551615 time=0 size=1
Stacks
EventBatch gen=1 m=18446744073709551615 time=0 size=12
Strings
String id=1
	data="whatever"
EventBatch gen=2 m=1 time=3 size=8

	}
	// Initialize lastTs if it hasn't been yet.
	if b.lastTs == 0 {
		b.lastTs = freq.mul(batches[b.idx].time)
	}
	// Read an event out.
	n, tsdiff, err := readTimedBaseEvent(batches[b.idx].data[b.dataOff:], &b.ev)
	if err != nil {
		return false, err
	}
	// Complete the timestamp from the cursor's last timestamp.
	b.ev.time = freq.mul(tsdiff) + b.lastTs

	// Move the cursor's timestamp forward.
	b.lastTs = b.ev.time

-- expect --
FAILURE "expected a proc but didn't have one"
-- trace --
Trace Go1.22
EventBatch gen=1 m=0 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=0 time=0 size=5
GoCreate dt=0 new_g=1 new_stack=0 stack=0

ProcStatus dt=1 p=0 pstatus=4
ProcSteal dt=1 p=0 p_seq=1 m=1
EventBatch gen=1 m=18446744073709551615 time=0 size=5
GoStatus dt=1 g=1 m=1 gstatus=3
EventBatch gen=1 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=18446744073709551615 time=0 size=1
Stacks
EventBatch gen=1 m=18446744073709551615 time=0 size=1

ProcStart dt=1 p=1 p_seq=1
GoSyscallEndBlocked dt=1
EventBatch gen=1 m=1 time=0 size=9
ProcStatus dt=1 p=0 pstatus=4
ProcSteal dt=1 p=0 p_seq=1 m=0
EventBatch gen=1 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=18446744073709551615 time=0 size=1
Stacks
EventBatch gen=1 m=18446744073709551615 time=0 size=1