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milescovielloandClaude Opus 5.5
bdead6944b
On Linux and macOS, fcntl and ioctl threw "descriptor N is neither a file, a directory, a pipe nor a character device" for a host socket that is not a guest socket. That is what a standard descriptor is when a service manager connects it to its journal, or when a test runner starts the process with a socket as stdin; guest_kernel_fcntl's standard input check aborts then. A socket is now its own descriptor kind. Its status and close-on-exec flags go through the host as for a pipe end, FIONREAD asks the host, record locks and read-ahead hints fail with EBADF as FreeBSD's kern_fcntl fails them on a descriptor without a vnode, and O_ASYNC throws as on a pipe. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>