Return values on function failure

The manifest constant SOCKET_ERROR is provided for checking function failure. Although use of this constant is not mandatory, it is recommended. The following example illustrates the use of the SOCKET_ERROR constant:

TYPICAL BSD STYLE:

r = recv(...);

if (r == -1 /* or r < 0 */

&& errno == EWOULDBLOCK)

{...}

PREFERRED STYLE:

r = recv(...);

if (r == SOCKET_ERROR

&& WSAGetLastError == WSAEWOULDBLOCK)

{...}

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