c-libp2p/include/libp2p/net/p2pnet.h

#ifndef P2PNET_H
#define P2PNET_H

#include <stdint.h>
#include <unistd.h>

	int socket_open4();
   int socket_bind4(int s, uint32_t ip, uint16_t port);
   int socket_bind4_reuse(int s, uint32_t ip, uint16_t port);
   int socket_read_select4(int socket_fd, int num_seconds);
   int socket_accept4(int s, uint32_t *ip, uint16_t *port);
   int socket_local4(int s, uint32_t *ip, uint16_t *port);
   int socket_connect4(int s, uint32_t ip, uint16_t port);
   int socket_listen(int s, uint32_t *localip, uint16_t *localport);
   ssize_t socket_read(int s, char *buf, size_t len, int flags, int timeout_secs);
   ssize_t socket_write(int s, const char *buf, size_t len, int flags);
   /**
    * Used to send the size of the next transmission for "framed" transmissions. NOTE: This will send in big endian format
    * @param s the socket descriptor
    * @param size the size to send
    * @param flags socket flags
    * @returns number of bytes sent
    */
   ssize_t socket_write_size(int s, unsigned long size, int flags);

   int socket_tcp4(void);

   int socket_stream_sctp4(void);

   int socket_udp4(void);

   /**
    * convert a hostname into an ip address
    * @param hostname the name of the host. i.e. www.jmjatlanta.com
    * @returns the ip address as an uint32_t
    */
   uint32_t hostname_to_ip(const char* hostname);

#endif // P2PNET_H