flingfd is a small, standalone C library to pass file descriptors across processes on Linux.
By default, flingfd installs in /usr/local. If you want to change where it gets installed, edit the PREFIX in the Makefile.
$ make && sudo make install
The library consists of two functions declared in flingfd.h:
bool flingfd_simple_send(const char *path, int fd);
int flingfd_simple_recv(const char *path);When you want to send a file descriptor, call flingfd_simple_send and receive it in the other process with flingfd_simple_recv. Make sure you use the same path argument in both processes -- that determines which process gets the file descriptor.
Here's an example of sending stdout to another process:
#include <flingfd.h>
void send_my_stdout() {
int fd = fileno(stdout);
flingfd_simple_send("/tmp/some_unique_path", fd);
}And here's the other process writing to the sender's stdout:
#include <flingfd.h>
void write_to_their_stdout() {
int fd = flingfd_simple_recv("/tmp/some_unique_path");
write(fd, "Hello world\n", 12);
}When you're done writing your code, link against the library with -lflingfd.
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