78 lines
2.7 KiB
HTML
78 lines
2.7 KiB
HTML
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The President and Fellows of Harvard College.
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-->
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<html>
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<head>
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<title>sparsefile</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>sparsefile</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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sparsefile - generate a sparse file
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</p>
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<h3>Synopsis</h3>
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<p>
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<tt>/testbin/sparsefile</tt> <em>filename</em> <em>size</em>
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</p>
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<h3>Description</h3>
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<p>
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<tt>sparsefile</tt> generates a sparse file (a file where most of the
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file is unallocated space) of the requested <em>size</em> by writing
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one byte to the end of it.
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The resulting file should use one block for data, and depending on the
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size (and the file system implementation) some small number of blocks
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for metadata.
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</p>
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<h3>Requirements</h3>
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<p>
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<tt>sparsefile</tt> uses the following system calls:
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<ul>
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<li><A HREF=../syscall/open.html>open</A></li>
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<li><A HREF=../syscall/lseek.html>lseek</A></li>
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<li><A HREF=../syscall/write.html>write</A></li>
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<li><A HREF=../syscall/close.html>close</A></li>
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<li><A HREF=../syscall/_exit.html>_exit</A></li>
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</ul>
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</p>
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<p>
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<tt>sparsefile</tt> will work once you have implemented the basic
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system calls, but will be most useful when working on the file
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system.
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</p>
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</body>
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</html>
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