[Bug 1916343] [NEW] -daemonize not working on macOS

[kljsandjb]

Public bug reported:

Basically e.g, if I try with below command on macOS:

qemu-system-x86_64 \
                   -m 4G \
                   -vga virtio \
                   -display default,show-cursor=on \
                   -usb \
                   -device usb-tablet \
                   -machine type=q35,accel=hvf \
                   -smp 2 \
                   -drive file=ubuntu.qcow2,if=virtio -cpu max \
                   -net nic -net 
user,hostfwd=tcp::50022-:22,hostfwd=tcp::8000-:80 \
                   -daemonize

With this command, the QEMU processes hang there forever. I guess there
is a bug when forking a child and kill the parent? Because when this
issue occurs, there are actually 2 QEMU processes running

```
  501 14952 14951   0  7:08PM ??         0:00.00 (qemu-system-x86_)
  501 14953     1   0  7:08PM ??         0:00.03 qemu-system-x86_64 -m 4G -vga 
virtio -display default,show-cursor=on -usb -device usb-tablet -machine 
type=q35,accel=hvf -smp 2 -drive file=ubuntu.qcow2,if=virtio -cpu max -net nic 
-net user,hostfwd=tcp::50022-:22,hostfwd=tcp::8000-:80 -daemonize
  501 14951 14626   0  7:08PM ttys000    0:00.03 qemu-system-x86_64 -m 4G -vga 
virtio -display default,show-cursor=on -usb -device usb-tablet -machine 
type=q35,accel=hvf -smp 2 -drive file=ubuntu.qcow2,if=virtio -cpu max -net nic 
-net user,hostfwd=tcp::50022-:22,hostfwd=tcp::8000-:80 -daemonize
```

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1916343

Title:
  -daemonize not working on macOS

Status in QEMU:
  New

Bug description:
  Basically e.g, if I try with below command on macOS:

  qemu-system-x86_64 \
                     -m 4G \
                     -vga virtio \
                     -display default,show-cursor=on \
                     -usb \
                     -device usb-tablet \
                     -machine type=q35,accel=hvf \
                     -smp 2 \
                     -drive file=ubuntu.qcow2,if=virtio -cpu max \
                     -net nic -net 
user,hostfwd=tcp::50022-:22,hostfwd=tcp::8000-:80 \
                     -daemonize

  With this command, the QEMU processes hang there forever. I guess
  there is a bug when forking a child and kill the parent? Because when
  this issue occurs, there are actually 2 QEMU processes running

  ```
    501 14952 14951   0  7:08PM ??         0:00.00 (qemu-system-x86_)
    501 14953     1   0  7:08PM ??         0:00.03 qemu-system-x86_64 -m 4G 
-vga virtio -display default,show-cursor=on -usb -device usb-tablet -machine 
type=q35,accel=hvf -smp 2 -drive file=ubuntu.qcow2,if=virtio -cpu max -net nic 
-net user,hostfwd=tcp::50022-:22,hostfwd=tcp::8000-:80 -daemonize
    501 14951 14626   0  7:08PM ttys000    0:00.03 qemu-system-x86_64 -m 4G 
-vga virtio -display default,show-cursor=on -usb -device usb-tablet -machine 
type=q35,accel=hvf -smp 2 -drive file=ubuntu.qcow2,if=virtio -cpu max -net nic 
-net user,hostfwd=tcp::50022-:22,hostfwd=tcp::8000-:80 -daemonize
  ```

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