<div dir="ltr"><p style="margin-bottom:0.5em;color:rgb(51,51,51);font-family:arial,sans-serif;font-size:16px">The Linux <em>man-pages</em> project documents the <a href="http://en.wikipedia.org/wiki/Linux" style="color:rgb(68,136,187);text-decoration:none">Linux</a> <a href="http://www.kernel.org/pub/linux/kernel" style="color:rgb(68,136,187);text-decoration:none">kernel</a> and C library interfaces that are employed by user-space programs. With respect to the C library, the primary focus is the <a href="http://www.gnu.org/" style="color:rgb(68,136,187);text-decoration:none">GNU</a> C library (<a href="http://www.gnu.org/software/libc/" style="color:rgb(68,136,187);text-decoration:none">glibc</a>), although, where known, documentation of variations on other C libraries available for Linux is also included. The project provides manual pages in the following sections:</p><ul style="color:rgb(51,51,51);font-family:arial,sans-serif;font-size:16px"><li><a href="http://man7.org/linux/man-pages/dir_section_1.html" style="color:rgb(68,136,187);text-decoration:none">1: <em>User commands</em></a>; <em>man-pages</em> includes a very few Section 1 pages that document programs supplied by the GNU C library.</li><li><a href="http://man7.org/linux/man-pages/dir_section_2.html" style="color:rgb(68,136,187);text-decoration:none">2: <em>System calls</em></a> documents the <a href="http://man7.org/linux/man-pages/man2/syscalls.2.html" style="color:rgb(68,136,187);text-decoration:none">system calls</a> provided by the Linux kernel.</li><li><a href="http://man7.org/linux/man-pages/dir_section_3.html" style="color:rgb(68,136,187);text-decoration:none">3: <em>Library functions</em></a> documents the functions provided by the standard C library.</li><li><a href="http://man7.org/linux/man-pages/dir_section_4.html" style="color:rgb(68,136,187);text-decoration:none">4: <em>Devices</em></a> documents details of various devices, most of which reside in <span class="" style="font-family:monospace;color:rgb(0,100,0)">/dev</span>.</li><li><a href="http://man7.org/linux/man-pages/dir_section_5.html" style="color:rgb(68,136,187);text-decoration:none">5: <em>Files</em></a> describes various file formats, and includes <a href="http://man7.org/linux/man-pages/man5/proc.5.html" style="color:rgb(68,136,187);text-decoration:none">proc(5)</a>, which documents the <span class="" style="font-family:monospace;color:rgb(0,100,0)">/proc</span> file system.</li><li><a href="http://man7.org/linux/man-pages/dir_section_7.html" style="color:rgb(68,136,187);text-decoration:none">7: <em>Overviews, conventions, and miscellaneous</em></a>.</li><li><a href="http://man7.org/linux/man-pages/dir_section_8.html" style="color:rgb(68,136,187);text-decoration:none">8: <em>Superuser and system administration commands</em></a>; <em>man-pages</em> includes a very few Section 8 pages, mainly documenting programs supplied by the GNU C library.<br></li></ul><div><font color="#333333" face="arial, sans-serif" size="3">That should answer your question I think.</font></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Sep 8, 2014 at 10:49 PM, <a href="mailto:xxu15@stevens.edu">xxu15@stevens.edu</a> <span dir="ltr"><<a href="mailto:xxu15@stevens.edu" target="_blank">xxu15@stevens.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div style="MARGIN:10px">
<div>Hi,</div>
<div style="TEXT-INDENT:2em">How to defferentiate between user code and kernel
code ?</div>
<div style="TEXT-INDENT:2em">Is there a standard to defferentiate the boundry
of the two ? Or just the Unix designers/engineers defined the boundry ?</div>
<div style="TEXT-INDENT:2em">Thank you.</div>
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<div>Sincerely,</div>
<div>Xiang Xu (徐祥) </div>
<div>Student ID: 10388813</div>
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