为什么这个对不同打开的 tty 的 exec.Command 不正常工作？

huangapple
go评论121阅读模式
英文:

Why does this exec.Command to a different opened tty not work properly

问题

有人可以帮我弄清楚我在这里做错了什么吗？

我试图执行一个命令（在这种情况下是打开vim），该命令在不同的tty中运行，即/dev/ttys001，在我的终端中的另一个选项卡中打开。

运行下面的代码确实在/dev/ttys001的窗口中显示了vim，但是从该窗口实际键入的内容无法正确注册。

非常感谢任何建议！

  1. package main
  3. import (
  4. 	"log"
  5. 	"os"
  6. 	"os/exec"
  7. )
  9. func main() {
  10. 	tty, err := os.OpenFile("/dev/ttys001", os.O_RDWR, os.ModePerm)
  11. 	if err != nil {
  12. 		log.Fatalln(err)
  13. 	}
  14. 	defer tty.Close()
  16. 	c := exec.Command("vim")
  17. 	c.Stdin = tty
  18. 	c.Stdout = tty
  19. 	c.Stderr = tty
  20. 	if err := c.Run(); err != nil {
  21. 		log.Fatalln(err)
  22. 	}
  23. }

我还尝试使用以下代码设置命令的SysProcAttr字段，但是收到错误消息：fork/exec /usr/local/bin/vim: inappropriate ioctl for device.

  1. procAttr := &syscall.SysProcAttr{
  2. 	Setpgid:    true,
  3. 	Ctty:       int(tty.Fd()),
  4. 	Foreground: true,
  5. }
  6. c.SysProcAttr = procAttr
英文:

Can anybody please help me figure out what I'm doing wrong here.

I'm trying to execute a command (opening vim in this case) that runs in a different tty, in this case /dev/ttys001, which is opened in another tab in my terminal.

Running the code below does render vim in /dev/ttys001's window, however, actually typing to stdin from that window doesn't register properly.

Any advice is much appreciated!

  1. package main
  3. import (
  4. 	"log"
  5. 	"os"
  6. 	"os/exec"
  7. )
  9. func main() {
  10. 	tty, err := os.OpenFile("/dev/ttys001", os.O_RDWR, os.ModePerm)
  11. 	if err != nil {
  12. 		log.Fatalln(err)
  13. 	}
  14. 	defer tty.Close()
  16. 	c := exec.Command("vim")
  17. 	c.Stdin = tty
  18. 	c.Stdout = tty
  19. 	c.Stderr = tty
  20. 	if err := c.Run(); err != nil {
  21. 		log.Fatalln(err)
  22. 	}
  23. }

I have also tried setting the command's SysProcAttr field with the following code but receive the error: fork/exec /usr/local/bin/vim: inappropriate ioctl for device.

  1. procAttr := &syscall.SysProcAttr{
  2. 	Setpgid:    true,
  3. 	Ctty:       int(tty.Fd()),
  4. 	Foreground: true,
  5. }
  6. c.SysProcAttr = procAttr

答案1

得分: 0

对于任何感兴趣的人，我想出了一个解决方案，但最终不得不使用系统调用而不是os/exec包的函数。

  1. package main
  3. import (
  4. 	"log"
  5. 	"os"
  6. 	"syscall"
  7. 	"unsafe"
  8. )
  10. var tty = "/dev/ttys001"
  11. var cmd = "vim\n"
  13. func main() {
  14. 	ttyFile, err := os.Open(tty)
  15. 	if err != nil {
  16. 		log.Fatalln(err)
  17. 	}
  18. 	defer ttyFile.Close()
  20. 	cbs, err := syscall.ByteSliceFromString(cmd)
  21. 	if err != nil {
  22. 		log.Fatalln(err)
  23. 	}
  25. 	var eno syscall.Errno
  26. 	for _, c := range cbs {
  27. 		_, _, eno = syscall.Syscall(syscall.SYS_IOCTL,
  28. 			ttyFile.Fd(),
  29. 			syscall.TIOCSTI,
  30. 			uintptr(unsafe.Pointer(&c)),
  31. 		)
  32. 		if eno != 0 {
  33. 			log.Fatalln(eno)
  34. 		}
  35. 	}
  36. }

希望对你有帮助！

英文:

For anybody who's interested, I came up with a solution, but I ended up having to use system calls instead of the os/exec package's functions.

  1. package main
  3. import (
  4. 	"log"
  5. 	"os"
  6. 	"syscall"
  7. 	"unsafe"
  8. )
  10. var tty = "/dev/ttys001"
  11. var cmd = "vim\n"
  13. func main() {
  14. 	ttyFile, err := os.Open(tty)
  15. 	if err != nil {
  16. 		log.Fatalln(err)
  17. 	}
  18. 	defer ttyFile.Close()
  20. 	cbs, err := syscall.ByteSliceFromString(cmd)
  21. 	if err != nil {
  22. 		log.Fatalln(err)
  23. 	}
  25. 	var eno syscall.Errno
  26. 	for _, c := range cbs {
  27. 		_, _, eno = syscall.Syscall(syscall.SYS_IOCTL,
  28. 			ttyFile.Fd(),
  29. 			syscall.TIOCSTI,
  30. 			uintptr(unsafe.Pointer(&c)),
  31. 		)
  32. 		if eno != 0 {
  33. 			log.Fatalln(eno)
  34. 		}
  35. 	}
  36. }

huangapple
  • 本文由 发表于 2016年9月6日 23:04:44
  • 转载请务必保留本文链接：https://go.coder-hub.com/39352292.html
  • go
  • macos
  • stdin
  • tty
  • vim
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