From fb5b49c0a20aad15b437a6040a6626047a2df657 Mon Sep 17 00:00:00 2001
From: Peter Gerwinski <peter@cassini.intern>
Date: Mon, 11 Jan 2016 16:39:17 +0100
Subject: [PATCH] Praktikum 11.1.2016: Beispielprogramme
---
20160111/noreturn-1.c | 13 +++++++++++++
20160111/random-1.c | 21 +++++++++++++++++++++
2 files changed, 34 insertions(+)
create mode 100644 20160111/noreturn-1.c
create mode 100644 20160111/random-1.c
diff --git a/20160111/noreturn-1.c b/20160111/noreturn-1.c
new file mode 100644
index 0000000..36bba51
--- /dev/null
+++ b/20160111/noreturn-1.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+__attribute__ ((noreturn)) void fatal_error (char *msg)
+{
+ fprintf (stderr, "%s\n", msg);
+ exit (1);
+}
+
+int main (void)
+{
+ fatal_error ("error not found");
+}
diff --git a/20160111/random-1.c b/20160111/random-1.c
new file mode 100644
index 0000000..5b72b6b
--- /dev/null
+++ b/20160111/random-1.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+int main (int argc, char **argv)
+{
+ FILE *dev_random = fopen ("/dev/random", "rb");
+ if (!dev_random)
+ {
+ fprintf (stderr, "%s: cannot open /dev/random\n", argv[0]);
+ exit (1);
+ }
+ else
+ {
+ uint16_t x;
+ fread (&x, sizeof (x), 1, dev_random);
+ printf ("%d\n", x);
+ fclose (dev_random);
+ }
+ return 0;
+}
--
GitLab