From 8fecb23e962d53c02c7770334190c4d73cd3d5bc Mon Sep 17 00:00:00 2001
From: John Denker <jsd@av8n.com>
Date: Sun, 15 Jul 2012 03:33:12 -0700
Subject: works, cleaner

---
 tools/hi-q.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

(limited to 'tools')

diff --git a/tools/hi-q.c b/tools/hi-q.c
index 6d73b9b..0dc66d7 100644
--- a/tools/hi-q.c
+++ b/tools/hi-q.c
@@ -51,7 +51,7 @@ void slurp(const int inch, const int ouch){
     while (todo) {
       ssize_t sent = write(ouch, buf, todo);
       if (sent < 0 && errno != EINTR) {
-        fprintf(stderr, "hi-q: output error: ");
+        fprintf(stderr, "hi-q: output error on fd%d : ", ouch);
         perror(0);
         panic(ex_comerr);
       }
@@ -121,6 +121,11 @@ void dump(const string var){
   else cerr << "hi-q: " << var << " is not set." << endl;
 }
 
+int xclose(int arg){
+  cerr << "closing " << arg << endl;
+  return close(arg);
+}
+
 int main(int argc, char** argv, char const * const * env) {
   int verbose(1);
   int kidstatus;
@@ -289,7 +294,8 @@ int main(int argc, char** argv, char const * const * env) {
         << " starts" << endl;
 #endif
 
-      close(resync[wEnd]);
+      close(resync[wEnd]);             // send resync
+
 // ... now we must wait for everybody else, because ...
 // ... if we do the exec(), the new process group becomes invalid ...
 // Close synchronization is released when the *last* guy closes.
@@ -304,9 +310,6 @@ int main(int argc, char** argv, char const * const * env) {
         }
       }
 
-//######      usleep(50000);
-
-
 // Now that we are through creating pipes, we don't
 // need to continue blocking fd1:
       close(1);
@@ -333,6 +336,9 @@ int main(int argc, char** argv, char const * const * env) {
         prog[jj] = filter[ii][jj].c_str();
       }
       prog[ntok] = 0;
+      close(resync[rEnd]);
+      close(sync[rEnd]);
+      close(sync[wEnd]);
       rslt = Execve(prog[0], prog, env);
       fprintf(stderr, "hi-q: failed to exec '%s': ", prog[0]);
       perror(0);
@@ -368,8 +374,11 @@ int main(int argc, char** argv, char const * const * env) {
 
 // here with the whole pipeline of kids launched
 
-  close(resync[wEnd]);
-  close(resync[rEnd]);
+  close(resync[wEnd]);  // important, so that block gets released
+  close(resync[rEnd]);  // less important, just housecleaning
+
+  close(sync[wEnd]);    // more housecleaning
+  close(sync[rEnd]);
 
   close(0);             // the reading end of stdin was
                         // delegated to the first child
-- 
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