Function addfd 

pub fn addfd(listener: i32, id: u64, fd: i32, cloexec: bool) -> Result<i32, i32>

Installs fd into the tracee at the lowest free descriptor number, without answering the notification. Closes the supervisor’s copy.

Arguments

• listener - Listener descriptor.
• id - Notification id.
• fd - Supervisor-side descriptor to hand over.
• cloexec - Set O_CLOEXEC on the tracee’s copy.

Returns

The descriptor number in the tracee.

Errors

Errno from the ioctl.