HP Rp7410 BSD Sockets Interface Programmer's Guide - Page 64

Parameter, Description of, Contents, INPUT Value

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Advanced Topics for Stream Sockets Socket Options • SO_RCVTIMEO The following socket options toggle socket behavior. optval is an integer containing a boolean flag for the behavior (1 = on, 0 = off): • SO_KEEPALIVE • SO_DEBUG • SO_DONTROUTE • SO_USELOOPBACK • SO_REUSEADDR • SO_OOBINLINE • SO_REUSEPORT The SO_LINGER option is a combination. It sets a linger value, and also toggles linger behavior on and off. In previous releases SO_DONTLINGER was supported. For SO_LINGER, optval points to a struct linger, defined in /usr/include/sys/socket.h. The structure contains an integer boolean flag to toggle behavior on/off, and an integer linger value. Refer to the getsockopt(2) man page for more information on getsockopt. setsockopt and its parameters are described in the following table: Include files: System call: #include #include setsockopt(s, level, optname, optval, optlen) int s, level, optname; char *optval; int optlen; Parameter Description of Contents s socket descriptor level protocol level INPUT Value socket descriptor for which options are to be set SOL_SOCKET 64 Chapter 3

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64
Chapter 3
Advanced Topics for Stream Sockets
Socket Options
•
SO_RCVTIMEO
The following socket options toggle socket behavior.
optval
is an integer
containing a boolean flag for the behavior (1 = on, 0 = off):
•
SO_KEEPALIVE
•
SO_DEBUG
•
SO_DONTROUTE
•
SO_USELOOPBACK
•
SO_REUSEADDR
•
SO_OOBINLINE
•
SO_REUSEPORT
The SO_LINGER option is a combination. It sets a linger value, and also
toggles linger behavior on and off. In previous releases
SO_DONTLINGER was supported. For SO_LINGER,
optval
points to a
struct
linger
, defined in
/usr/include/sys/socket.h
. The
structure contains an integer boolean flag to toggle behavior on/off, and
an integer linger value. Refer to the
getsockopt(2)
man page for more
information on
getsockopt
.
setsockopt
and its parameters are described in the following table:
Include files:
#include <sys/types.h>
#include <sys/socket.h>
System call:
setsockopt(s, level, optname, optval, optlen)
int s, level, optname;
char *optval;
int optlen;
Parameter
Description of
Contents
INPUT Value
s
socket descriptor
socket descriptor for
which options are to be set
level
protocol level
SOL_SOCKET