C/E + + network programming sets the socket to blocking and non-blocking in Windows and Linux

C/E + + network programming sets the socket to blocking and non-blocking in Windows and Linux

In the socket programming, the socket read and write default is blocked, but in some cases we need to set it to non-blocking, such as multi-multiplexing, or through select to achieve the connection timeout, such as the socket is set to non-blocking, The interface between Windows and Linux is different, using the Ioctlsocket function in Windows, using the FCNTL function in Linux, let's do a cross-platform setup blocking function Setblock.

BOOL Setblock (int sock,bool isblock) {int re = 0;//is distinguished from Windows and Linux by macro, if the WINDOWS64-bit program determines _WIN64 macro #ifdef win32unsigned Long UL = 0;if (!isblock) ul = 1;re = ioctlsocket (sock, Fionbio, (unsigned long*) &ul); #else//First fetch to the existing descriptor property to ensure that this change does not change the original attribute int fl AGS = Fcntl (sock, F_GETFL, 0); if (Flags < 0) {return false;} if (isblock) {flags = flags & ~o_nonblock;} Else{flags = Flags | O_nonblock;} Re = fcntl (sock, F_SETFL, flags); #endifif (Re! = 0) return False;return true;}

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C/E + + network programming sets the socket to blocking and non-blocking in Windows and Linux