From b4c41e946104923df82212be453cf77b8eab63e5 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Mon, 27 Jun 2011 22:23:18 +0000
Subject: [PATCH] Make kgss test processes run in lock-step

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@24994 dc483132-0cff-0310-8789-dd5450dbe970
---
 src/util/gss-kernel-lib/t_kgss_common.c | 21 +++++++++++++++++++++
 src/util/gss-kernel-lib/t_kgss_common.h |  2 ++
 src/util/gss-kernel-lib/t_kgss_kernel.c |  9 +++++++++
 src/util/gss-kernel-lib/t_kgss_user.c   | 10 ++++++++++
 4 files changed, 42 insertions(+)

diff --git a/src/util/gss-kernel-lib/t_kgss_common.c b/src/util/gss-kernel-lib/t_kgss_common.c
index 1b31634c2..211cecc2b 100644
--- a/src/util/gss-kernel-lib/t_kgss_common.c
+++ b/src/util/gss-kernel-lib/t_kgss_common.c
@@ -82,3 +82,24 @@ read_data(int fd, void **data_out, size_t *len_out)
     *data_out = data;
     *len_out = len;
 }
+
+/*
+ * Acknowledgements are used to make the parent and child processes operate in
+ * lock-step.  That way, if the child fails, the parent isn't several steps
+ * ahead before it finds out.
+ */
+
+void
+send_ack(int fd)
+{
+    rewrite(fd, "ack", 3);
+}
+
+void
+read_ack(int fd)
+{
+    char buf[3];
+
+    reread(fd, buf, 3);
+    assert(memcmp(buf, "ack", 3) == 0);
+}
diff --git a/src/util/gss-kernel-lib/t_kgss_common.h b/src/util/gss-kernel-lib/t_kgss_common.h
index 8225bef28..edb38886a 100644
--- a/src/util/gss-kernel-lib/t_kgss_common.h
+++ b/src/util/gss-kernel-lib/t_kgss_common.h
@@ -28,3 +28,5 @@ void rewrite(int fd, const void *data, size_t len);
 void reread(int fd, void *buf, size_t len);
 void send_data(int fd, const void *data, size_t len);
 void read_data(int fd, void **data_out, size_t *len_out);
+void send_ack(int fd);
+void read_ack(int fd);
diff --git a/src/util/gss-kernel-lib/t_kgss_kernel.c b/src/util/gss-kernel-lib/t_kgss_kernel.c
index 0d70f1f38..f5914f421 100644
--- a/src/util/gss-kernel-lib/t_kgss_kernel.c
+++ b/src/util/gss-kernel-lib/t_kgss_kernel.c
@@ -273,12 +273,21 @@ main(int argc, char **argv)
     krb5_c_random_os_entropy(NULL, 0, &dummy);
 
     read_lucid_context(&acceptor);
+    send_ack(STDOUT_FILENO);
     read_wrap_token(acceptor);
+    send_ack(STDOUT_FILENO);
     read_mic_token(acceptor);
+    send_ack(STDOUT_FILENO);
     read_iov_token(acceptor);
+    send_ack(STDOUT_FILENO);
+
     send_wrap_token(acceptor);
+    read_ack(STDIN_FILENO);
     send_mic_token(acceptor);
+    read_ack(STDIN_FILENO);
     send_iov_token(acceptor);
+    read_ack(STDIN_FILENO);
+
     cleanup_context(acceptor);
     return 0;
 }
diff --git a/src/util/gss-kernel-lib/t_kgss_user.c b/src/util/gss-kernel-lib/t_kgss_user.c
index 15fca238a..6c4b63841 100644
--- a/src/util/gss-kernel-lib/t_kgss_user.c
+++ b/src/util/gss-kernel-lib/t_kgss_user.c
@@ -378,13 +378,23 @@ main(int argc, char **argv)
 
     establish_contexts(argv[1], &initiator, &acceptor);
     start_child(&to_child, &from_child, &child_pid);
+
     send_lucid_context(acceptor, to_child);
+    read_ack(from_child);
     send_wrap_token(initiator, to_child);
+    read_ack(from_child);
     send_mic_token(initiator, to_child);
+    read_ack(from_child);
     send_iov_token(initiator, to_child);
+    read_ack(from_child);
+
     read_wrap_token(initiator, from_child);
+    send_ack(to_child);
     read_mic_token(initiator, from_child);
+    send_ack(to_child);
     read_iov_token(initiator, from_child);
+    send_ack(to_child);
+
     cleanup_context(initiator);
     close(to_child);
     close(from_child);
-- 
2.26.2