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<a name='TOP'><h2><a href='../mains.html'>root</a>/<a href='../files/108.html'>lib</a>/dup.c</h2>
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<a name='L1'><i><font color='green'>/*</font></i>
<a name='L2'><i><font color='green'>* linux/lib/dup.c</font></i>
<a name='L3'><i><font color='green'>*</font></i>
<a name='L4'><i><font color='green'>* (C) 1991 Linus Torvalds</font></i>
<a name='L5'><i><font color='green'>480</font></i>
<a name='L6'><i><font color='green'>*/</font></i>
<a name='L7'>
<a name='L8'><font color='darkred'>#define</font> <a href='../S/50.html#L71' title='Refered from 71 in include/unistd.h.'>__LIBRARY__</a>
<a name='L9'><font color='darkred'>#include</font> &lt;<a href='50.html'>unistd.h</a>&gt;             <i><font color='green'>// Linux 标准头文件。定义了各种符号常数和类型，并申明了各种函数。</font></i>
<a name='L10'><i><font color='green'>// 如定义了__LIBRARY__，则还包括系统调用号和内嵌汇编_syscall0()等。</font></i>
<a name='L11'>
<a name='L12'><i><font color='green'>//// 复制文件描述符函数。</font></i>
<a name='L13'><i><font color='green'>// 下面该调用宏函数对应：int dup(int fd)。直接调用了系统中断int 0x80，参数是__NR_dup。</font></i>
<a name='L14'><i><font color='green'>// 其中fd 是文件描述符。</font></i>
<a name='L15'><a href='../S/50.html#L167' title='Defined at 167 in include/unistd.h.'>_syscall1</a> (<b>int</b>, dup, <b>int</b>, fd)
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