Here are the functions for examining and modifying socket options. They are declared in `sys/socket.h'.
getsockopt
function gets information about the value of
option optname at level level for socket socket.
The option value is stored in a buffer that optval points to.
Before the call, you should supply in *optlen-ptr
the
size of this buffer; on return, it contains the number of bytes of
information actually stored in the buffer.
Most options interpret the optval buffer as a single int
value.
The actual return value of getsockopt
is 0
on success
and -1
on failure. The following errno
error conditions
are defined:
EBADF
ENOTSOCK
ENOPROTOOPT
@hfuzz 6pt
The return value and error codes for setsockopt
are the same as
for getsockopt
.
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