adding zephyr-im master branch

lib/ZWait4Not.c

@@ -0,0 +1,70 @@
+/* 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>
+ *
+ *	$Id$
+ *
+ *	Copyright (c) 1991 by the Massachusetts Institute of Technology.
+ *	For copying and distribution information, see the file
+ *	"mit-copyright.h". 
+ */
+
+#include "mit-copyright.h"
+
+#ifndef lint
+static const char rcsid_ZWaitForNotice_c[] = "$Id$";
+#endif
+
+#include <internal.h>
+#include <sys/socket.h>
+
+Code_t
+Z_WaitForNotice(ZNotice_t *notice,
+		int (*pred) __P((ZNotice_t *, void *)),
+		void *arg,
+		int timeout)
+{
+  Code_t retval;
+  struct timeval tv, t0;
+  fd_set fdmask;
+  int i, fd;
+
+  retval = ZCheckIfNotice (notice, (struct sockaddr_in *) 0, pred,
+			   (char *) arg);
+  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 *) arg);
+      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*/
+}