SubprocessLauncher.takeFd

Transfer an arbitrary file descriptor from parent process to the child. This function takes "ownership" of the fd; it will be closed in the parent when @self is freed.

By default, all file descriptors from the parent will be closed. This function allows you to create (for example) a custom pipe() or socketpair() before launching the process, and choose the target descriptor in the child.

An example use case is GNUPG, which has a command line argument --passphrase-fd providing a file descriptor number where it expects the passphrase to be written.

class SubprocessLauncher
void
takeFd
(,)

Parameters

sourceFd int

File descriptor in parent process

targetFd int

Target descriptor for child process

Meta