<!-- Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2013 The President and Fellows of Harvard College. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the University nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. --> <html> <head> <title>randcall</title> <body bgcolor=#ffffff> <h2 align=center>randcall</h2> <h4 align=center>OS/161 Reference Manual</h4> <h3>Name</h3> <p> randcall - make randomized system calls </p> <h3>Synopsis</h3> <p> <tt>/testbin/randcall</tt> [<tt>-f</tt>] [<tt>-c</tt> <em>count</em>] [<tt>-r</tt> <em>seed</em>] <em>callset</em> </p> <h3>Description</h3> <p> <tt>randcall</tt> makes randomized system calls, that is, system calls with completely random arguments. The <em>callset</em> determines which list of system calls it uses; it is either "all", which does everything, or a number that identifies one of the assignments, in which case it exercises all the system calls that are supposed to be working when that assignment is complete. (If the lists compiled into randcall are wrong, contact your course staff.) </p> <p> Ordinarily, in case some of these calls cause process termination, randcall forks before making each call. This can be slow, so the -f option can be used to suppress this behavior. </p> <p> The <tt>-c</tt> <em>count</em> option tells randcall to make <em>count</em> iterations through the list of calls it's using. (It always goes through the list sequentially.) The default count is 100. </p> <p> The <tt>-r</tt> <em>seed</em> option allows one to set the pseudorandom seed used by <tt>randcall</tt> to generate the call arguments. The default seed is 0. </p> <p> <tt>randcall</tt> prints what it's doing, so if it blows up you should be able to see what happened. </p> <p> The system calls that do not take arguments are not on any of the call lists. Neither is <A HREF=../syscall/reboot.html>reboot</A>, to prevent accidental system shutdown. </p> <h3>Requirements</h3> <p> <tt>randcall</tt> should never under any circumstances crash the kernel, no matter what call list is in use. </p> <h3>Bugs</h3> <p> There should be an option to seed the random generator from <A HREF=../dev/random.html>random:</A>. </p> </body> </html>