#define _GNU_SOURCE
#endif

#include <grp.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include "libcgo.h"

/*
 * Assumed POSIX compliant libc system call wrappers. For linux, the
 * glibc/nptl/setxid mechanism ensures that POSIX semantics are
 * honored for all pthreads (by default), and this in turn with cgo
 * ensures that all Go threads launched with cgo are kept in sync for

	MOVQ	DX, (5*8)(DI) // r2

	// Standard libc functions return -1 on error
	// and set errno.
	CMPL	AX, $-1	      // Note: high 32 bits are junk
	JNE	ok

	// Get error code from libc.
	CALL	libc_error(SB)
	MOVLQSX	(AX), AX
	MOVQ	(SP), DI
	MOVQ	AX, (6*8)(DI) // err

ok:
	XORL	AX, AX        // no error (it's ignored anyway)
	RET

// syscallX calls a function in libc on behalf of the syscall package.

package main

// This program hung when run under the C/C++ ThreadSanitizer. TSAN defers
// asynchronous signals until the signaled thread calls into libc. The runtime's
// sysmon goroutine idles itself using direct usleep syscalls, so it could
// run for an arbitrarily long time without triggering the libc interceptors.
// See https://golang.org/issue/18717.

import (
	"os"
	"os/signal"
	"syscall"
)

/*

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package unix

import (
	"syscall"
	"unsafe"
)

//go:cgo_import_dynamic libc_ioctl ioctl "libc.a/shr_64.o"
//go:linkname libc_ioctl libc_ioctl
var libc_ioctl uintptr

// Implemented in syscall/syscall_aix.go.
func syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)

var x_cgo_set_context_function byte
var _cgo_set_context_function = &x_cgo_set_context_function

// Calls a libc function to execute background work injected via libc
// interceptors, such as processing pending signals under the thread
// sanitizer.
//
// Left as a nil pointer if no libc interceptors are expected.

//go:cgo_import_static _cgo_yield
//go:linkname _cgo_yield _cgo_yield
var _cgo_yield unsafe.Pointer

	// sequence of string pointers followed by a NULL, and auxv.
	// There is no TLS base pointer.
	MOVW	0(R29), R4 // argc
	ADD	$4, R29, R5 // argv
	JMP	main(SB)

TEXT main(SB),NOSPLIT|NOFRAME,$0
	// In external linking, libc jumps to main with argc in R4, argv in R5
	MOVW	$runtime·rt0_go(SB), R1

	abort();
}

// Truncated to a different magic value on 32-bit; that's ok.
#define magic1 (0x23581321345589ULL)

// From https://android.googlesource.com/platform/bionic/+/refs/heads/android10-tests-release/libc/private/bionic_asm_tls.h#69.
#define TLS_SLOT_APP 2

// inittls allocates a thread-local storage slot for g.
//
// It finds the first available slot using pthread_key_create and uses

#include <assert.h>
#include <pthread.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <ucontext.h>

// musl libc does not provide getcontext, etc. Skip the test there.
//
// musl libc doesn't provide any direct detection mechanism. So assume any
// non-glibc linux is using musl.
//
// Note that bionic does not provide getcontext either, but that is skipped via
// the android build tag.

#include <u.h>
#include <libc.h>

void
main(void)
{
	print("hello, world\n");

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime

import "unsafe"

func sbrk(n uintptr) unsafe.Pointer {
	// Plan 9 sbrk from /sys/src/libc/9sys/sbrk.c
	bl := bloc
	n = memRound(n)
	if bl+n > blocMax {
		if brk_(unsafe.Pointer(bl+n)) < 0 {
			return nil
		}
		blocMax = bl + n
	}
	bloc += n
	return unsafe.Pointer(bl)