// libc interceptor that writes signal handlers to a global variable within the
// TSAN runtime instead of making a sigaction system call. A bug in
// syscall.runtime_AfterForkInChild corrupted TSAN's signal forwarding table
// during calls to (*os/exec.Cmd).Run, causing the parent process to fail to
// invoke signal handlers.

import (
	"fmt"
	"os"
	"os/exec"
	"os/signal"

	// number in the parent process.
	Foreground bool
	Pgid       int // Child's process group ID if Setpgid.
}

// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()

// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)

}

const (
	_P_PID = 0

	_PROC_PDEATHSIG_CTL = 11
)

// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()

// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)

	// number in the parent process.
	Foreground bool
	Pgid       int // Child's process group ID if Setpgid.
}

// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()

func chdir(path uintptr) (err Errno)
func chroot1(path uintptr) (err Errno)
func closeFD(fd uintptr) (err Errno)
func dup2child(old uintptr, new uintptr) (val uintptr, err Errno)

	// number in the parent process.
	Foreground bool
	Pgid       int // Child's process group ID if Setpgid.
}

// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()

// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)

	slash = [...]byte{'/', 0}

	forceClone3 = false // Used by unit tests only.
)

// Implemented in runtime package.
func runtime_BeforeFork()
func runtime_AfterFork()
func runtime_AfterForkInChild()

// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)

//   - github.com/containerd/containerd
//   - gvisor.dev/gvisor
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname syscall_runtime_AfterForkInChild syscall.runtime_AfterForkInChild
//go:nosplit
//go:nowritebarrierrec
func syscall_runtime_AfterForkInChild() {
	// It's OK to change the global variable inForkedChild here
	// because we are going to change it back. There is no race here,