<!-- Copyright (c) 2015 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>redirect</title> <link rel="stylesheet" type="text/css" media="all" href="../man.css"> </head> <body bgcolor=#ffffff> <h2 align=center>redirect</h2> <h4 align=center>OS/161 Reference Manual</h4> <h3>Name</h3> <p> redirect - test I/O redirection </p> <h3>Synopsis</h3> <p> <tt>/testbin/redirect</tt> </p> <h3>Description</h3> <p> <tt>redirect</tt> does a simple test of I/O redirection like a Unix shell might do. It first creates an input test file, then invokes <A HREF=../bin/cat.html>cat</A> to copy it, with standard input and standard output suitably redirected. Then it checks that the copy happened correctly, and removes the test files. </p> <p> The specifications of Unix system calls are such that this program should take no extra work to support once basic tests show that the pieces are working. </p> <h3>Requirements</h3> <p> <tt>redirect</tt> uses the following system calls: <ul> <li><A HREF=../syscall/open.html>open</A></li> <li><A HREF=../syscall/dup2.html>dup2</A></li> <li><A HREF=../syscall/read.html>read</A></li> <li><A HREF=../syscall/write.html>write</A></li> <li><A HREF=../syscall/close.html>close</A></li> <li><A HREF=../syscall/remove.html>remove</A></li> <li><A HREF=../syscall/fork.html>fork</A></li> <li><A HREF=../syscall/execv.html>execv</A></li> <li><A HREF=../syscall/waitpid.html>waitpid</A></li> <li><A HREF=../syscall/_exit.html>_exit</A></li> </ul> </p> <p> <tt>redirect</tt> should work once you have implemented the basic system calls, including fork, exec, and wait. </p> <p> Note that until you implement remove (which is typically not part of the basic system calls assignment), and in any case on emufs, the test files will not get removed. This is not important, just untidy. </p> </body> </html>