c := make(chan os.Signal, 1)
	signal.Notify(c, syscall.SIGUSR1)
	defer signal.Stop(c)
	syscall.Kill(syscall.Getpid(), syscall.SIGUSR1)
	<-c

func stackGuardMultiplier(race bool) int {
	// This arithmetic must match that in runtime/internal/sys/consts.go:StackGuardMultiplier.
	n := 1
	// On AIX, a larger stack is needed for syscalls.
	if buildcfg.GOOS == "aix" {
		n += 1
	}
	// The race build also needs more stack.
	if race {
		n += 1
	}
	return n

Carlos Amedee <******@****.***> 1715265901 -0400

#include "textflag.h"

// System call support for ARM64 BSD

// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.

TEXT	·Syscall(SB),NOSPLIT,$0-56
	JMP	syscall·Syscall(SB)

TEXT	·Syscall6(SB),NOSPLIT,$0-80
	JMP	syscall·Syscall6(SB)

TEXT	·Syscall9(SB),NOSPLIT,$0-104
	JMP	syscall·Syscall9(SB)

TEXT	·RawSyscall(SB),NOSPLIT,$0-56

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

#include "textflag.h"

// func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
	MOVD	num+0(FP), R8	// syscall entry
	MOVD	a1+8(FP), R0
	MOVD	a2+16(FP), R1
	MOVD	a3+24(FP), R2
	MOVD	a4+32(FP), R3
	MOVD	a5+40(FP), R4
	MOVD	a6+48(FP), R5
	SVC
	CMN	$4095, R0

#include "textflag.h"

// System call support for 386 BSD

// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.

TEXT	·Syscall(SB),NOSPLIT,$0-28
	JMP	syscall·Syscall(SB)

TEXT	·Syscall6(SB),NOSPLIT,$0-40
	JMP	syscall·Syscall6(SB)

TEXT	·Syscall9(SB),NOSPLIT,$0-52
	JMP	syscall·Syscall9(SB)

TEXT	·RawSyscall(SB),NOSPLIT,$0-28

	libc_Getpgrp libcFunc
)

func Getpgid(pid int) (pgid int, err error) {
	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_Getpgid)), 1, uintptr(pid), 0, 0, 0, 0, 0)
	pgid = int(r0)
	if e1 != 0 {
		err = e1
	}
	return
}

func Getpgrp() (pgrp int) {
	r0, _, _ := syscall6(uintptr(unsafe.Pointer(&libc_Getpgrp)), 0, 0, 0, 0, 0, 0, 0)
	pgrp = int(r0)
	return
}

func Tcgetpgrp(fd int) (pgid int32, err error) {

#include "textflag.h"

// func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
TEXT ·Syscall6(SB),NOSPLIT,$0-80
	MOVV	num+0(FP), R2	// syscall entry
	MOVV	a1+8(FP), R4
	MOVV	a2+16(FP), R5
	MOVV	a3+24(FP), R6
	MOVV	a4+32(FP), R7
	MOVV	a5+40(FP), R8
	MOVV	a6+48(FP), R9
	MOVV	R0, R3	// reset R3 to 0 as 1-ret SYSCALL keeps it
	SYSCALL
	BEQ	R7, ok
	MOVV	$-1, R1
	MOVV	R1, r1+56(FP)

// System calls for ppc64, Linux
//

// Just jump to package syscall's implementation for all these functions.
// The runtime may know about them.

TEXT ·SyscallNoError(SB),NOSPLIT,$0-48
	BL	runtime·entersyscall(SB)
	MOVD	a1+8(FP), R3
	MOVD	a2+16(FP), R4
	MOVD	a3+24(FP), R5
	MOVD	R0, R6
	MOVD	R0, R7
	MOVD	R0, R8
	MOVD	trap+0(FP), R9	// syscall entry
	SYSCALL R9
	MOVD	R3, r1+32(FP)
	MOVD	R4, r2+40(FP)

func syscall_rawSyscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)

//go:linkname syscall_syscall syscall.syscall
//go:linkname syscall_syscall6 syscall.syscall6
//go:linkname syscall_syscall10 syscall.syscall10
//go:linkname syscall_rawSyscall syscall.rawSyscall
//go:linkname syscall_rawSyscall6 syscall.rawSyscall6

func syscall_syscall9(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno) {