getsockopt TCP UDP

Get a specific option value on a specific TCP socket. See function NetSock_OptGet for more information.

Files

net_bsd.h/net_bsd.c

Prototype

          int getsockopt(int         sock_id,
                         int         level,
                         int         opt_name,
                         void       *p_opt_val,
                         sock_len_t *p_opt_len);

Arguments

sock_id

This is the socket ID returned by NetSock_Open()/socket() when the socket was created or by NetSock_Accept()/accept() when a connection was accepted.

level

Protocol level from which to retrieve the socket option.

opt_name

Socket option to set the value.

p_opt_val

Pointer to the socket option value to set.

p_opt_len

Pointer to the socket option value to get.

Returned Value

0, if successful;

-1, otherwise.

Required Configuration

None.

Notes / Warnings

The supported options are:

• Protocol level SOL_SOCKET:
  • SO_TYPE
  • SO_KEEPALIVE
  • SO_ACCEPTCONN
  • SO_SNDBUF / SO_RCVBUF
  • SO_SNDTIMEO / SO_RCVTIMEO
• Protocol level IPPROTO_IP:
  • IP_TOS
  • IP_TTL
  • IP_RECVIF
• Protocol level IPPROTO_TCP:
  • TCP_NODELAY
  • TCP_KEEPCNT
  • TCP_KEEPIDLE
  • TCP_INTVL