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Linux系统调用

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<TITLE>Syscall specifications of Linux - ftruncate</TITLE>
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<H2><A NAME="SEC16" HREF="syscalls_toc.html#SEC16" tppabs="http://personal.xfol.com/%7erezaie/syscall/syscalls_toc.html#SEC16">ftruncate and truncate</A></H2>
<P>
<H3>SYNOPSIS</H3>
<P>
<CODE>int ftruncate(int <VAR>fd</VAR>, size_t <VAR>length</VAR>);</CODE>
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<CODE>int truncate(char *<VAR>path</VAR>, size_t <VAR>length</VAR>);</CODE>
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<H3>DESCRIPTION</H3>
<P>
Those calls truncate a file to a specified length. In the case of
<CODE>ftruncate</CODE>, the file must be opened for writing.
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<H3>PARAMETERS</H3>
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<VAR>fd</VAR>: [in] the file descriptor to truncate.
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<VAR>path</VAR>: [in] points to the path of the file to truncate.
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<VAR>length</VAR>: [in] the new size of the file.
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<H3>RETURN VALUE</H3>
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On success zero is returned. On error, -1 is returned and <CODE>errno</CODE> is
set to one of the following values:
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for <CODE>ftruncate</CODE>:
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<UL>
<LI><CODE>ENOENT</CODE>: the file is invalid.
<LI><CODE>EBADF</CODE>, <CODE>EACCESS</CODE>.
</UL>
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for <CODE>truncate</CODE>:
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<UL>
<LI><CODE>ENOTDIR</CODE>, <CODE>EINVAL</CODE>, <CODE>ENAMETOOLONG</CODE>, <CODE>ENOENT</CODE>,
<CODE>EACCESS</CODE>, <CODE>ELOOP</CODE>, <CODE>EISDIR</CODE>, <CODE>EROFS</CODE>,
<CODE>ETXTBSY</CODE>, <CODE>EIO</CODE> or <CODE>EFAULT</CODE>.
</UL>
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