From ab121f379a3cff458c90e6f480ba4bb68c8733dd Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <martinez.javier@gmail.com>
Date: Sat, 27 Nov 2010 07:49:17 +0100
Subject: Linux Device Drivers 3 examples

---
 misc-progs/polltest.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 misc-progs/polltest.c

(limited to 'misc-progs/polltest.c')

diff --git a/misc-progs/polltest.c b/misc-progs/polltest.c
new file mode 100644
index 0000000..fdc461d
--- /dev/null
+++ b/misc-progs/polltest.c
@@ -0,0 +1,47 @@
+/*
+ * Test out reading with poll()
+ * This should run with any Unix
+ *
+ * Copyright (C) 2003 Alessandro Rubini and Jonathan Corbet
+ * Copyright (C) 2003 O'Reilly & Associates
+ *
+ * The source code in this file can be freely used, adapted,
+ * and redistributed in source or binary form, so long as an
+ * acknowledgment appears in derived source files.  The citation
+ * should list that the code comes from the book "Linux Device
+ * Drivers" by Alessandro Rubini and Jonathan Corbet, published
+ * by O'Reilly & Associates.   No warranty is attached;
+ * we cannot take responsibility for errors or fitness for use.
+ *
+ * $Id: polltest.c,v 1.1 2003/02/07 18:01:38 corbet Exp $
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/poll.h>
+#include <fcntl.h>
+
+char buffer[4096];
+
+int main(int argc, char **argv)
+{
+    struct pollfd pfd;
+    int n;
+
+    fcntl(0, F_SETFL, fcntl(0,F_GETFL) | O_NONBLOCK); /* stdin */
+    pfd.fd = 0;  /* stdin */
+    pfd.events = POLLIN;
+
+    while (1) {
+        n=read(0, buffer, 4096);
+        if (n >= 0)
+            write(1, buffer, n);
+	n = poll(&pfd, 1, -1);
+	if (n < 0)
+	    break;
+    }
+    perror( n<0 ? "stdin" : "stdout");
+    exit(1);
+}
-- 
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