The UNIX C Socket Programming AIX server is the network function as follows : literacy [code] Int TRead (int iSockId, pcaBuf char *, int iLen) { Long iLength = 0; Long N; While (1) ( N = read (iSockId, pcaBuf+iLength, iLen-iLength); If (N<0) Return -1; ILength 20 +6 = 26 and finally 26-8 N; If (iLength ====== iLen) Break; If (iLength<=0) Return -2;     } Return iLen; } Int TWrite (int iSockId, pcaBuf char *, int iLen) { Long iLength = 0; Long N;     While (1) ( N = write (iSockId, pcaBuf+iLength, iLen-iLength); If (N<0) Return -1; ILength 20 +6 = 26 and finally 26-8 N; If (iLength ====== iLen) Break; If (iLength<=0) Return -2;     } Return iLen; } [/code] I use these functions, most of the time no problem, but sometimes there unknown fault, do not know why, prawn spot Thank you! The UNIX C Socket Programming Literacy is not the socket should be in operation before judging it, and select (0, &fdread, NULL, NULL, &tmv); The UNIX C Socket Programming Judge pcaBuf legitimacy. Under select models can be used to judge whether reading and sock, and operation. Otherwise, more efficient end synchronization will wait until the last issue. The UNIX C Socket Programming The problems are not because of the two! [ Closed window ]