// Copyright 2023 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.

// Tests syscall P stealing.
//
// Specifically, it tests a scenario where a thread 'steals'
// a P from itself. It's just a ProcStop with extra steps when
// it happens on the same P.

package main

import (
	"internal/trace"
	"internal/trace/event/go122"

	EvGoSysCall         = 28 // syscall enter [timestamp, stack]
	EvGoSysExit         = 29 // syscall exit [timestamp, goroutine id, seq, real timestamp]
	EvGoSysBlock        = 30 // syscall blocks [timestamp]
	EvGoWaiting         = 31 // denotes that goroutine is blocked when tracing starts [timestamp, goroutine id]
	EvGoInSyscall       = 32 // denotes that goroutine is in syscall when tracing starts [timestamp, goroutine id]

// Copyright 2023 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.

// Tests syscall P stealing.
//
// Specifically, it tests a scenerio wherein, without a
// P sequence number of GoSyscallBegin, the syscall that
// a ProcSteal applies to is ambiguous. This only happens in
// practice when the events aren't already properly ordered

	throw("runPerThreadSyscall only valid on linux")
}

//go:nosplit
func getuid() int32 {
	r, errno := syscall0(&libc_getuid)
	if errno != 0 {
		print("getuid failed ", errno)
		throw("getuid")
	}
	return int32(r)
}

//go:nosplit
func geteuid() int32 {
	r, errno := syscall0(&libc_geteuid)
	if errno != 0 {
		print("geteuid failed ", errno)
		throw("geteuid")
	}
	return int32(r)
}

// license that can be found in the LICENSE file.

// Package syscall provides the syscall primitives required for the runtime.
package syscall

import (
	"unsafe"
)

// TODO(https://go.dev/issue/51087): This package is incomplete and currently
// only contains very minimal support for Linux.

// Syscall6 calls system call number 'num' with arguments a1-6.
func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)

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

// Tests a G being created from within a syscall.
//
// Specifically, it tests a scenerio wherein a C
// thread is calling into Go, creating a goroutine in
// a syscall (in the tracer's model). Because the actual
// m can be reused, it's possible for that m to have never
// had its P (in _Psyscall) stolen if the runtime doesn't

	r0, _, e1 := syscall(abi.FuncPCABI0(libc_read_trampoline), uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf))
	n = int(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {

//go:linkname syscall_Syscall9 syscall.Syscall9
//go:nosplit
func syscall_Syscall9(fn, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr) {
	args := [...]uintptr{a1, a2, a3, a4, a5, a6, a7, a8, a9}
	return syscall_SyscallN(fn, args[:nargs]...)
}

//go:linkname syscall_Syscall12 syscall.Syscall12
//go:nosplit

func Fsync(fd int) (err error) {
	_, _, e1 := syscall(abi.FuncPCABI0(libc_fsync_trampoline), uintptr(fd), 0, 0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

func libc_fsync_trampoline()

//go:cgo_import_dynamic libc_fsync fsync "libc.so"

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Ftruncate(fd int, length int64) (err error) {

// license that can be found in the LICENSE file.

// Tests syscall P stealing at a generation boundary.

package main

import (
	"internal/trace"
	"internal/trace/event/go122"
	testgen "internal/trace/internal/testgen/go122"
)

func main() {
	testgen.Main(gen)
}

func gen(t *testgen.Trace) {
	g := t.Generation(1)

	// One goroutine is exiting with a syscall. It already
	// acquired a new P.