getsockopt
or
setsockopt
to manipulate the socket-level options described in
this section.
Here is a table of socket-level option names; all are defined in the header file `sys/socket.h'.
SO_DEBUG
int
; a nonzero value means
"yes".
SO_REUSEADDR
bind
(see section Setting the Address of a Socket)
should permit reuse of local addresses for this socket. If you enable
this option, you can actually have two sockets with the same Internet
port number; but the system won't allow you to use the two
identically-named sockets in a way that would confuse the Internet. The
reason for this option is that some higher-level Internet protocols,
including FTP, require you to keep reusing the same port number.
The value has type int
; a nonzero value means "yes".
SO_KEEPALIVE
int
; a nonzero value means
"yes".
SO_DONTROUTE
int
; a nonzero
value means "yes".
SO_LINGER
struct linger
.
int l_onoff
close
blocks until the data are transmitted or the timeout period has expired.
int l_linger
SO_BROADCAST
int
; a nonzero value means "yes".
SO_OOBINLINE
read
or recv
without specifying the MSG_OOB
flag. See section Out-of-Band Data. The value has type int
; a
nonzero value means "yes".
SO_SNDBUF
size_t
, which is the size in bytes.
SO_RCVBUF
size_t
, which is the size in bytes.
SO_STYLE
SO_TYPE
getsockopt
only. It is used to
get the socket's communication style. SO_TYPE
is the
historical name, and SO_STYLE
is the preferred name in GNU.
The value has type int
and its value designates a communication
style; see section Communication Styles.
SO_ERROR
getsockopt
only. It is used to reset
the error status of the socket. The value is an int
, which represents
the previous error status.
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