Squashed 'external/toxcore/c-toxcore/' content from commit 67badf69

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455

super_donators/grencez_tok5.c

@@ -0,0 +1,41 @@
+/* Though it may look bleak at times,
+ * this ring will stabilize to have one token,
+ * and Tox will be the one true chat protocol!
+ *  -- Alex P. Klinkhamer (grencez)
+ */
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+int main(int i, char** msg)
+{
+  int j, fd[4], xpd, xid;
+  if (--i<1)  return 1;
+  srand(getpid());
+  pipe(fd);
+  while (xid=rand()%5, --i>0) {
+    pipe(&fd[2]);
+    j = (0==fork() ? 0 : 1);
+    close(fd[j]);
+    fd[j] = fd[j+2];
+    close(fd[3-j]);
+    if (j==0)  break;
+  }
+#define SendSc()  write(fd[1], &xid, sizeof(xid))
+#define RecvPd()  read(fd[0], &xpd, sizeof(xpd))
+#define A(g,v)  if (g) {xid=v; puts(msg[i+1]); fflush(stdout); SendSc();}
+  SendSc();
+  while (RecvPd(), 1) {
+    sleep(1);
+    if (i==0) {
+      A( xpd==0 && xid==0 , 1 );
+      A( xpd==1 && xid<=1 , 2 );
+      A( xpd> 1 && xid> 1 , 0 );
+      continue;
+    }
+    A( xpd==0 && xid> 1 , xid/4 );
+    A( xpd==1 && xid!=1 , 1     );
+    A( xpd==2 && xid<=1 , 2+xid );
+    A( xpd>=3 && xid<=1 , 4     );
+  }
+  return 0;
+}