90 lines
3.0 KiB
HTML
90 lines
3.0 KiB
HTML
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Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2013
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The President and Fellows of Harvard College.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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SUCH DAMAGE.
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-->
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<html>
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<head>
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<title>random</title>
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<link rel="stylesheet" type="text/css" media="all" href="../man.css">
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</head>
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<body bgcolor=#ffffff>
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<h2 align=center>random</h2>
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<h4 align=center>OS/161 Reference Manual</h4>
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<h3>Name</h3>
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<p>
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random - pseudorandom number generation
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</p>
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<h3>Library</h3>
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<p>
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Standard C Library (libc, -lc)
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</p>
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<h3>Synopsis</h3>
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<p>
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<tt>#include <stdlib.h></tt><br>
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<br>
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<tt>long</tt><br>
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<tt>random(void);</tt><br>
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<br>
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<tt>void</tt><br>
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<tt>srandom(unsigned long </tt><em>seed</em><tt>);</tt><br>
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</p>
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<h3>Description</h3>
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<p>
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<tt>random</tt> returns a number between 0 and 0x7fffffff. This
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number is selected using a rather complex generator which is believed
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to generate randomness of an acceptable (though not cryptographic)
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quality. Unlike with some generators, all bits of the values returned
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are random.
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</p>
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<p>
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<tt>srandom</tt> initializes the generator state based on the
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passed-in <em>seed</em>. If <tt>srandom</tt> is not called, the
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sequence of numbers returned by <tt>random</tt> is the same as if
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<tt>srandom</tt> had been called with a <em>seed</em> of 1.
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</p>
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<p>
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The symbolic constant <tt>RAND_MAX</tt> is provided to hold the
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maximum value 0x7fffffff.
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This is technically incorrect as the name <tt>RAND_MAX</tt> is
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properly part of a different random number interface.
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</p>
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<p>
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The implementation of <tt>random</tt> and <tt>srandom</tt> used in
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OS/161 is software developed by the University of California, Berkeley
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and its contributors.
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</p>
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</body>
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</html>
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