This patch fixes a bug which causes sftpd to hang whenever the
clock() function returns -1 (typically caused by system uptime
greater than 248 days).

To apply this patch, download this page to a file called
entropy-patch.txt, then:

  % cd sftpd-1.46
  % patch < entropy-patch.txt
  % make
  (then copy 'sftpd' to wherever it's currently installed)

*** entropy.cpp.prev	Tue Apr 23 17:40:31 2002
--- entropy.cpp	Tue Apr 23 17:43:43 2002
***************
*** 125,131 ****
    // get some entropy from process scheduler
    unsigned long i=0;
    clock_t clk = clock();
!   while (clk == clock()) i++;
    s.clks = i;
  
    long ret = crc32(buffer, sizeof(buffer));
--- 125,139 ----
    // get some entropy from process scheduler
    unsigned long i=0;
    clock_t clk = clock();
!   if (clk == (clock_t)(-1)) {
!     // clock() doesn't want to give useful info.. 
!     // let's try something else
!     s.clks = (clock_t)getMilliseconds();
!   }
!   else {
!     // count how many iterations it takes for a change..
!     while (clk == clock()) i++;
!   }
    s.clks = i;
  
    long ret = crc32(buffer, sizeof(buffer));