1 files changed, 104 insertions, 0 deletions
diff --git a/src/os/exec_unix.go b/src/os/exec_unix.go
new file mode 100644
index 0000000..36b320d
--- /dev/null
+++ b/src/os/exec_unix.go
@@ -0,0 +1,104 @@
+// Copyright 2009 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 unix || (js && wasm) || wasip1
+
+package os
+
+import (
+	"errors"
+	"runtime"
+	"syscall"
+	"time"
+)
+
+func (p *Process) wait() (ps *ProcessState, err error) {
+	if p.Pid == -1 {
+		return nil, syscall.EINVAL
+	}
+
+	// If we can block until Wait4 will succeed immediately, do so.
+	ready, err := p.blockUntilWaitable()
+	if err != nil {
+		return nil, err
+	}
+	if ready {
+		// Mark the process done now, before the call to Wait4,
+		// so that Process.signal will not send a signal.
+		p.setDone()
+		// Acquire a write lock on sigMu to wait for any
+		// active call to the signal method to complete.
+		p.sigMu.Lock()
+		p.sigMu.Unlock()
+	}
+
+	var (
+		status syscall.WaitStatus
+		rusage syscall.Rusage
+		pid1   int
+		e      error
+	)
+	for {
+		pid1, e = syscall.Wait4(p.Pid, &status, 0, &rusage)
+		if e != syscall.EINTR {
+			break
+		}
+	}
+	if e != nil {
+		return nil, NewSyscallError("wait", e)
+	}
+	p.setDone()
+	ps = &ProcessState{
+		pid:    pid1,
+		status: status,
+		rusage: &rusage,
+	}
+	return ps, nil
+}
+
+func (p *Process) signal(sig Signal) error {
+	if p.Pid == -1 {
+		return errors.New("os: process already released")
+	}
+	if p.Pid == 0 {
+		return errors.New("os: process not initialized")
+	}
+	p.sigMu.RLock()
+	defer p.sigMu.RUnlock()
+	if p.done() {
+		return ErrProcessDone
+	}
+	s, ok := sig.(syscall.Signal)
+	if !ok {
+		return errors.New("os: unsupported signal type")
+	}
+	if e := syscall.Kill(p.Pid, s); e != nil {
+		if e == syscall.ESRCH {
+			return ErrProcessDone
+		}
+		return e
+	}
+	return nil
+}
+
+func (p *Process) release() error {
+	// NOOP for unix.
+	p.Pid = -1
+	// no need for a finalizer anymore
+	runtime.SetFinalizer(p, nil)
+	return nil
+}
+
+func findProcess(pid int) (p *Process, err error) {
+	// NOOP for unix.
+	return newProcess(pid, 0), nil
+}
+
+func (p *ProcessState) userTime() time.Duration {
+	return time.Duration(p.rusage.Utime.Nano()) * time.Nanosecond
+}
+
+func (p *ProcessState) systemTime() time.Duration {
+	return time.Duration(p.rusage.Stime.Nano()) * time.Nanosecond
+}