5xxx functions from nbdkit.

[libguestfs-talks.git] / 2020-frama-c / 5400-timeval.html

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+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>nbdkit tvdiff_usec</h1>
+
+<pre class="code">
+  /*@
+    requires \valid_read (x) && \valid_read (y);
+    requires valid_timeval (*x) && valid_timeval (*y);
+    requires \valid (r);
+    assigns *r;
+    behavior success:
+      ensures \result == 0;
+      ensures \let diff = tv_to_microseconds (*y) - tv_to_microseconds (*x);
+              INT64_MIN <= diff <= INT64_MAX &&
+              *r == diff;
+    behavior failure:
+      ensures \result == -1;
+      ensures *r == 0;
+      ensures \let diff = tv_to_microseconds (*y) - tv_to_microseconds (*x);
+              !(INT64_MIN <= diff <= INT64_MAX);
+    complete behaviors;
+    disjoint behaviors;
+   */
+  static inline int
+  tvdiff_usec (const struct timeval *x, const struct timeval *y,
+               int64_t *r)
+  ...
+</pre>