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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><!--Converted with LaTeX2HTML 96.1-h (September 30, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --><HTML><HEAD><TITLE>Measuring Holes</TITLE><META NAME="description" CONTENT="Measuring Holes"><META NAME="keywords" CONTENT="sag"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><LINK REL=STYLESHEET HREF="sag.css"></HEAD><BODY LANG="EN" > <A NAME="tex2html1614" HREF="node106.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="./next_motif.gif"></A> <A NAME="tex2html1612" HREF="sag.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="./up_motif.gif"></A> <A NAME="tex2html1606" HREF="node104.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="./previous_motif.gif"></A> <A NAME="tex2html1616" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="./contents_motif.gif"></A> <A NAME="tex2html1617" HREF="node108.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="./index_motif.gif"></A> <BR><B> Next:</B> <A NAME="tex2html1615" HREF="node106.html">Glossary (DRAFT)</A><B>Up:</B> <A NAME="tex2html1613" HREF="sag.html">Linux System Administrators' Guide </A><B> Previous:</B> <A NAME="tex2html1607" HREF="node104.html">When the clock is </A><BR> <P><H1><A NAME="SECTION001200000000000000000">测量孔(Measuring Holes)</A></H1> <A NAME="chapmeasureholes"> </A><P>本附录包括用于测量文件系统中潜在的孔的程序的有趣的部分。The source distribution of the book contains the full source code(<tt>sag/measure-holes/measure-holes.c</tt>).<P><BLOCKQUOTE> <PRE>int process(FILE *f, char *filename) { static char *buf = NULL; static long prev_block_size = -1; long zeroes; char *p; if (buf == NULL || prev_block_size != block_size) { free(buf); buf = xmalloc(block_size + 1); buf[block_size] = 1; prev_block_size = block_size; } zeroes = 0; while (fread(buf, block_size, 1, f) == 1) { for (p = buf; *p == '\0'; ) ++p; if (p == buf+block_size) zeroes += block_size; } if (zeroes > 0) printf("%ld %s\n", zeroes, filename); if (ferror(f)) { errormsg(0, -1, "read failed for `%s'", filename); return -1; } return 0;}</PRE></BLOCKQUOTE><BR> <HR><P><ADDRESS><I>Lars Wirzenius <BR>Sun Jun 29 13:31:22 EEST 1997</I></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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