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Linux系统调用

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<TITLE>Syscall specifications of Linux - mount</TITLE>
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<H2><A NAME="SEC22" HREF="syscalls_toc.html#SEC22" tppabs="http://personal.xfol.com/%7erezaie/syscall/syscalls_toc.html#SEC22">mount and umount</A></H2>
<P>
<H3>SYNOPSIS</H3>
<P>
<CODE>int mount(const char *<VAR>specialfile</VAR>, const char *<VAR>dir</VAR>,
const char *<VAR>filesystemtype</VAR>,unsigned long <VAR>rwflag</VAR>, const void
*<VAR>data</VAR>);</CODE>
<P>
<CODE>int umount(const char *<VAR>specialfile</VAR>);</CODE>
<P>
<H3>PARAMETERS</H3>
<P>
<VAR>specialfile</VAR>: [in] points to the path of the file system to mount.
<P>
<VAR>dir</VAR>: [in] points to the directory where to mount the file system.
<P>
<CODE>filesystemtype</CODE>: [in] the type of file system.
<P>
<VAR>rwflag</VAR>: [in] specifies read/write accesses to the file system.
<P>
<VAR>data</VAR>: [in] fs dependent parameters.
<P>
<H3>DESCRIPTION</H3>
<P>
<CODE>mount</CODE> mounts the file system and <CODE>umount</CODE> unmounts it. Only
a task with superuser privileges may call those two syscalls.
<P>
The <VAR>rwflag</VAR> parameter may take the one or more of following or'ed
values:
<P>
<DL COMPACT>
<DT><CODE>MS_RDONLY</CODE>
<DD>mount read-only.
<P>
<DT><CODE>MS_NOSUID</CODE>
<DD>ignore suid and sgid bits.
<P>
<DT><CODE>MS_NODEV</CODE>
<DD>disallow access to device special files.
<P>
<DT><CODE>MS_NOEXEC</CODE>
<DD>disallow program execution.
<P>
<DT><CODE>MS_SYNC</CODE>
<DD>writes are synced at once.
<P>
<DT><CODE>MS_REMOUNT</CODE>
<DD>alter flags of a mounted FS.
</DL>
<P>
<H3>RETURN VALUE</H3>
<P>
<UL>
<LI><CODE>EPERM</CODE>, <CODE>ENODEV</CODE>, <CODE>ENOTBLK</CODE>, <CODE>ENXIO</CODE>,
<CODE>EMFILE</CODE>, <CODE>EFAULT</CODE>, <CODE>ENOMEM</CODE>, <CODE>EINVAL</CODE>,
<CODE>EBUSY</CODE>, <CODE>ENOTDIR</CODE>, <CODE>ENOENT</CODE>, <CODE>ENAMETOOLONG</CODE>,
<CODE>ELOOP</CODE>, <CODE>EROFS</CODE>.
</UL>
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