From b3bdf359c6466abd7d18867be8bb3e0e21f3c887 Mon Sep 17 00:00:00 2001
From: Kenneth G Raeburn <raeburn@mit.edu>
Date: Thu, 21 Mar 1991 07:05:21 +0000
Subject: Initial revision

---
 lib/ZWait4Not.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 lib/ZWait4Not.c

(limited to 'lib/ZWait4Not.c')

diff --git a/lib/ZWait4Not.c b/lib/ZWait4Not.c
new file mode 100644
index 0000000..c550ae0
--- /dev/null
+++ b/lib/ZWait4Not.c
@@ -0,0 +1,75 @@
+/* This file is part of the Project Athena Zephyr Notification System.
+ * It contains the ZCheckIfNotice/select loop used for waiting for
+ * a notice, with a timeout.
+ *
+ *	Created by:	<Joe Random Hacker>
+ *
+ *	$Source$
+ *	$Author$
+ *
+ *	Copyright (c) 1991 by the Massachusetts Institute of Technology.
+ *	For copying and distribution information, see the file
+ *	"mit-copyright.h". 
+ */
+
+#include <zephyr/mit-copyright.h>
+
+#ifndef lint
+static char rcsid_ZWaitForNotice_c[] =
+  "$Zephyr$";
+#endif
+
+#include <zephyr/zephyr.h>
+#ifdef _AIX
+#include <sys/select.h>
+#endif
+
+Code_t
+Z_WaitForNotice (notice, pred, uid, timeout)
+     ZNotice_t *notice;
+     int (*pred) ();
+     ZUnique_Id_t *uid;
+     int timeout;
+{
+  Code_t retval;
+  struct timeval tv, t0;
+  fd_set fdmask;
+  int i, fd;
+
+  retval = ZCheckIfNotice (notice, (struct sockaddr_in *) 0, pred,
+			   (char *) uid);
+  if (retval == ZERR_NONE)
+    return ZERR_NONE;
+  if (retval != ZERR_NONOTICE)
+    return retval;
+
+  fd = ZGetFD ();
+  FD_ZERO (&fdmask);
+  tv.tv_sec = timeout;
+  tv.tv_usec = 0;
+  gettimeofday (&t0, (struct timezone *) 0);
+  t0.tv_sec += timeout;
+  while (1) {
+    FD_SET (fd, &fdmask);
+    i = select (fd + 1, &fdmask, (fd_set *) 0, (fd_set *) 0, &tv);
+    if (i == 0)
+      return ETIMEDOUT;
+    if (i < 0 && errno != EINTR)
+      return errno;
+    if (i > 0) {
+      retval = ZCheckIfNotice (notice, (struct sockaddr_in *) 0, pred,
+			       (char *) uid);
+      if (retval != ZERR_NONOTICE) /* includes ZERR_NONE */
+	return retval;
+    }
+    gettimeofday (&tv, (struct timezone *) 0);
+    tv.tv_usec = t0.tv_usec - tv.tv_usec;
+    if (tv.tv_usec < 0) {
+      tv.tv_usec += 1000000;
+      tv.tv_sec = t0.tv_sec - tv.tv_sec - 1;
+    }
+    else
+      tv.tv_sec = t0.tv_sec - tv.tv_sec;
+  }
+  /*NOTREACHED*/
+}
-- 
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