socket_connect4(3) attempt to make a TCP connection


#include <socket.h>

int socket_connect4(int s,const char ip[4],uint16 port);


socket_connect4 attempts to make a connection from TCP socket s to TCP port port on IP address ip.

socket_connect4 may return

  • 0, to indicate that the connection succeeded (and succeeded immediately, if the socket is non-blocking)
  • -1, setting errno to error_inprogress or error_wouldblock, to indicate that the socket is non-blocking
  • -1, setting errno to something else, to indicate that the connection failed (and failed immediately, if the socket is non-blocking).

When a background connection succeeds or fails, s becomes writable; you can use socket_connected to see whether the connection succeeded. If the connection failed, socket_connected returns 0, setting errno appropriately.

Once a TCP socket is connected, you can use the read and write system calls to transmit data.

You can call socket_connect4 without calling socket_bind4. This has the effect as first calling socket_bind4 with IP address and port 0.


  #include <socket.h>

  int s;
  char ip[4];
  uint16 p;

  s = socket_tcp4();