AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE Uživatelská příručka stáhnout pdf (Strana 233)

KwikNet TCP/IP Sockets

DAK

219

Description ...continued

Optionval is a pointer to the option value. The size of each option is

indicated in the option list. Note that

bool is an int value that is 1 if

the option is to be enabled or 0 if the option is to be disabled. The type

u/s long indicates a 32-bit value usually represented by an unsigned

long

. The structure linger required by option SO_LINGER is described

in header file KN_SOCK.H.

Optionlen is the length of the option value at the location referenced by

optionval.

Note Option SO_NONBLOCK is a unique KwikNet option which conditions a socket

such that subsequent socket operations proceed with or without blocking

the caller. Note that, although a socket is always a blocking socket when

first created, this option permits the mode of operation to be altered by

your application. The option value in the call must be non-zero to set

non-blocking mode or zero to restore the socket to blocking mode.

Returns If successful, a value of 0 is returned.

On failure, the error status -1 is returned.

The error indicator for socket s is set to define the reason for failure. Use

kn_errno() to retrieve the error code.

EBADF The socket descriptor s is invalid.

EINVAL One or more parameters are invalid or

parameter optionlen specifies a length that is less

than that required to specify the option.

ENOPROTOOPT The option is unknown at the level indicated.

EPERM The option cannot be set after a connection is

established.

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AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE Uživatelská příručka Strana 233