// Copyright 2016 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 cgo && !windows

// Issue 18146: pthread_create failure during syscall.Exec.

package cgotest

import (
	"bytes"
	"crypto/md5"
	"os"
	"os/exec"
	"runtime"
	"syscall"
	"testing"
	"time"
)

func test18146(t *testing.T) {
	if testing.Short() {

pkg syscall (openbsd-386), func SendmsgN(int, []uint8, []uint8, Sockaddr, int) (int, error)
pkg syscall (openbsd-386), type Dirent struct, Fileno uint64
pkg syscall (openbsd-386), type Dirent struct, Off int64
pkg syscall (openbsd-386), type Dirent struct, X__d_padding [4]uint8
pkg syscall (openbsd-386), type FdSet struct, Bits [32]uint32
pkg syscall (openbsd-386), type Kevent_t struct, Data int64

				buf.Grow(growLen)
				buf.Write(yBytes)
			})
			// Check no allocation occurs in write, as long as we're single-threaded.
			if allocs != 0 {
				t.Errorf("allocation occurred during write")
			}
			// Check that buffer has correct data.
			if !Equal(buf.Bytes()[0:startLen-readBytes], xBytes[readBytes:]) {
				t.Errorf("bad initial data at %d %d", startLen, growLen)
			}

and is not guaranteed to be the same from one iteration to the next.
If a map entry that has not yet been reached is removed during iteration,
the corresponding iteration value will not be produced. If a map entry is
created during iteration, that entry may be produced during the iteration or
may be skipped. The choice may vary for each entry created and from one
iteration to the next.

pkg syscall (netbsd-arm64-cgo), type Dirent struct
pkg syscall (netbsd-arm64-cgo), type Dirent struct, Fileno uint64
pkg syscall (netbsd-arm64-cgo), type Dirent struct, Name [512]int8
pkg syscall (netbsd-arm64-cgo), type Dirent struct, Namlen uint16
pkg syscall (netbsd-arm64-cgo), type Dirent struct, Pad_cgo_0 [3]uint8
pkg syscall (netbsd-arm64-cgo), type Dirent struct, Reclen uint16

	if !x {
		t.Fatal("nestedCall did not call func")
	}
}

func testCallbackGC(t *testing.T) {
	nestedCall(runtime.GC)
}

func testCallbackPanic(t *testing.T) {
	// Make sure panic during callback unwinds properly.
	if lockedOSThread() {
		t.Fatal("locked OS thread on entry to TestCallbackPanic")
	}
	defer func() {
		s := recover()
		if s == nil {
			t.Fatal("did not panic")
		}

		_cgo_thread_start unsafe.Pointer
	)

Any package using cgo imports "runtime/cgo", which provides
initializations for these variables. It sets iscgo to true, _cgo_init
to a gcc-compiled function that can be called early during program
startup, and _cgo_thread_start to a gcc-compiled function that can be
used to create a new thread, in place of the runtime's usual direct
system calls.

Internal and External Linking

const MinRead = 512

// ReadFrom reads data from r until EOF and appends it to the buffer, growing
// the buffer as needed. The return value n is the number of bytes read. Any
// error except io.EOF encountered during the read is also returned. If the
// buffer becomes too large, ReadFrom will panic with [ErrTooLarge].
func (b *Buffer) ReadFrom(r io.Reader) (n int64, err error) {
	b.lastRead = opInvalid
	for {
		i := b.grow(MinRead)

pkg syscall (darwin-386), type Dirent struct
pkg syscall (darwin-386), type Dirent struct, Ino uint64
pkg syscall (darwin-386), type Dirent struct, Name [1024]int8
pkg syscall (darwin-386), type Dirent struct, Namlen uint16
pkg syscall (darwin-386), type Dirent struct, Pad_cgo_0 [3]uint8
pkg syscall (darwin-386), type Dirent struct, Reclen uint16
pkg syscall (darwin-386), type Dirent struct, Seekoff uint64

pkg syscall (freebsd-arm64), type Dirent struct
pkg syscall (freebsd-arm64), type Dirent struct, Fileno uint64
pkg syscall (freebsd-arm64), type Dirent struct, Name [256]int8
pkg syscall (freebsd-arm64), type Dirent struct, Namlen uint16
pkg syscall (freebsd-arm64), type Dirent struct, Off int64
pkg syscall (freebsd-arm64), type Dirent struct, Pad0 uint8
pkg syscall (freebsd-arm64), type Dirent struct, Pad1 uint16