libdill: Structured Concurrency for C

NAME

tcp_listener_fromfd - wraps an existing OS-level file descriptor

#include <libdill.h>

int tcp_listener_fromfd(
    int fd);

TCP protocol is a reliable bytestream protocol for transporting data over network. It is defined in RFC 793.

This function wraps an existing OS-level file descriptor.

fd: File descriptor of a listening TCP socket to wrap.

The socket can be cleanly shut down using tcp_close function which will also close the underlying file descriptor.

There's no way to unwrap the file descriptor.

This function is not available if libdill is compiled with --disable-sockets option.

In case of success the function returns newly created socket handle. In case of error it returns -1 and sets errno to one of the values below.

EMFILE: The maximum number of file descriptors in the process are already open.
ENFILE: The maximum number of file descriptors in the system are already open.
ENOMEM: Not enough memory.

int fd = socket(AF_INET, SOCK_STREAM, 0);
bind(fd, addr, sizeof(addr));
listen(fd, 10);
int s = tcp_listener_fromfd(fd);