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os.go
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os.go
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// +build !windows
// Package os runs processes locally
package os
import (
"fmt"
"os"
"os/exec"
"strconv"
"syscall"
"github.com/geiqin/go-micro/runtime/local/process"
)
func (p *Process) Exec(exe *process.Executable) error {
cmd := exec.Command(exe.Package.Path)
cmd.Dir = exe.Dir
return cmd.Run()
}
func (p *Process) Fork(exe *process.Executable) (*process.PID, error) {
// create command
cmd := exec.Command(exe.Package.Path, exe.Args...)
cmd.Dir = exe.Dir
// set env vars
cmd.Env = append(cmd.Env, os.Environ()...)
cmd.Env = append(cmd.Env, exe.Env...)
// create process group
cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
in, err := cmd.StdinPipe()
if err != nil {
return nil, err
}
out, err := cmd.StdoutPipe()
if err != nil {
return nil, err
}
er, err := cmd.StderrPipe()
if err != nil {
return nil, err
}
// start the process
if err := cmd.Start(); err != nil {
return nil, err
}
return &process.PID{
ID: fmt.Sprintf("%d", cmd.Process.Pid),
Input: in,
Output: out,
Error: er,
}, nil
}
func (p *Process) Kill(pid *process.PID) error {
id, err := strconv.Atoi(pid.ID)
if err != nil {
return err
}
if _, err := os.FindProcess(id); err != nil {
return err
}
// now kill it
// using -ve PID kills the process group which we created in Fork()
return syscall.Kill(-id, syscall.SIGTERM)
}
func (p *Process) Wait(pid *process.PID) error {
id, err := strconv.Atoi(pid.ID)
if err != nil {
return err
}
pr, err := os.FindProcess(id)
if err != nil {
return err
}
ps, err := pr.Wait()
if err != nil {
return err
}
if ps.Success() {
return nil
}
return fmt.Errorf(ps.String())
}