pub const unsafe fn stderr() -> BorrowedFd<'static>Expand description
STDERR_FILENO—Standard error, borrowed.
Safety
This function must be called from code which knows how the process’
standard error is being used. Often, this will be the main function or
code that knows its relationship with the main function.
The stderr file descriptor can be closed, potentially on other threads, in which case the file descriptor index value could be dynamically reused for other purposes, potentially on different threads.
Other hazards
Stderr could be redirected to arbitrary output sinks, and unless one knows how the process’ standard error is being used, one could unexpectedly inject bytes into a stream being written by another part of the process.