proxyfd

Linux kernel module implementing proxy files. Proxy file sits in front of a pipe write end. Every chunk of data written via proxy is prefixed with the chunk length in atomic fashion. The length is OR-combined with a cookie set at creation time. With cookies it is possible to tell the origin if multiple proxies use the same pipe.

Usage:

Device node: /dev/proxyfd. To request a proxy, write the following request into device:

struct request
{
  uint32_t flags; // O_CLOEXEC
  uint32_t cookie;
  uint32_t pipefd;
};

write() result is either an error or a new (proxy) file descriptor.

Check user.c for usage example.

Install:

make && sudo insmod proxyfd.ko