Network Sockets

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
extern int h_errno;

struct hostent *gethostbyname(const char *name);
uint16_t htons(uint16_t hostshort);
int listen(int sockfd, int backlog);
int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen);

To accept connections, the following steps are performed:

1. A socket is created with socket().

2. The socket is bound to a local address using bind(), so that other sockets can connect() to it.

3. The willingness to accept incoming connections and a queue limit for incoming connections are specified with listen().

4. Connections are accepted with accept().

sockets_stream.png