int rcv(int sck, void * buf, int size, int time_out)

{

if (sck < 1 || !buf || size < 1) return 0;

timeval tv = { 0, 0}; timeval * ptv = 0;

if (time_out > 0) { tv.tv_sec = time_out; ptv = &tv; }

memset(buf, 0, size);

int r = 0; char * b = (char*) buf; int sz = size;

fd_set rd, er; int total = 0; time_t t0 = time(0); time_t t1 = 0;

do {

FD_ZERO(&rd); FD_SET(sck, &rd);

FD_ZERO(&er); FD_SET(sck, &er);

r = select(sck + 1, &rd, 0, &er, ptv);

if (r == -1) { nperror("select()"); return -1; }

if (FD_ISSET(sck, &er)) {

nperror("socket(shutdown)"); return -1;

}//end if

if (FD_ISSET(sck, &rd)) {

r = recv(sck, b, sz, 0);

if (r == -1) { nperror("recv()"); return -1; }

total += r; sz -= r; b+= r;

}//end if

if (time_out > 0)

t1 = time(0) - t0;

else

t1 = time_out - 1;

//end if

}while(sz && t1 < time_out);

return total;

}//end if