320 lines
6.7 KiB
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320 lines
6.7 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of QUERY_MODULE</TITLE>
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</HEAD><BODY>
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<H1>QUERY_MODULE</H1>
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Section: Linux Programmer's Manual (2)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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query_module - query the kernel for various bits pertaining to modules
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/linux/module.h">linux/module.h</A>></B>
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<B>int query_module(const char *</B><I>name</I><B>, int </B><I>which</I><B>, void *</B><I>buf</I><B>,</B>
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<B> size_t </B><I>bufsize</I><B>, size_t *</B><I>ret</I><B>);</B>
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</PRE>
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<P>
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<I>Note</I>:
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No declaration of this system call is provided in glibc headers; see NOTES.
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<I>Note</I>:
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This system call is present only in kernels before Linux 2.6.
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<P>
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<B>query_module</B>()
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requests information from the kernel about loadable modules.
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The returned information is placed in the buffer pointed to by
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<I>buf</I>.
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The caller must specify the size of
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<I>buf</I>
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in
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<I>bufsize</I>.
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The precise nature and format of the returned information
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depend on the operation specified by
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<I>which</I>.
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Some operations require
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<I>name</I>
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to identify a currently loaded module, some allow
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<I>name</I>
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to be NULL, indicating the kernel proper.
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<P>
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The following values can be specified for
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<I>which</I>:
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<DL COMPACT>
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<DT id="1"><B>0</B>
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<DD>
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Returns success, if the kernel supports
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<B>query_module</B>().
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Used to probe for availability of the system call.
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<DT id="2"><B>QM_MODULES</B>
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<DD>
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Returns the names of all loaded modules.
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The returned buffer consists of a sequence of null-terminated strings;
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<I>ret</I>
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is set to the number of
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modules.
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<DT id="3"><B>QM_DEPS</B>
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<DD>
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Returns the names of all modules used by the indicated module.
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The returned buffer consists of a sequence of null-terminated strings;
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<I>ret</I>
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is set to the number of modules.
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<DT id="4"><B>QM_REFS</B>
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<DD>
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Returns the names of all modules using the indicated module.
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This is the inverse of
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<B>QM_DEPS</B>.
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The returned buffer consists of a sequence of null-terminated strings;
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<I>ret</I>
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is set to the number of modules.
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<DT id="5"><B>QM_SYMBOLS</B>
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<DD>
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Returns the symbols and values exported by the kernel or the indicated
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module.
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The returned buffer is an array of structures of the following form
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<DT id="6"><DD>
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struct module_symbol {
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<BR> unsigned long value;
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<BR> unsigned long name;
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};
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<DT id="7"><DD>
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followed by null-terminated strings.
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The value of
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<I>name</I>
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is the character offset of the string relative to the start of
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<I>buf</I>;
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<I>ret</I>
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is set to the number of symbols.
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<DT id="8"><B>QM_INFO</B>
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<DD>
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Returns miscellaneous information about the indicated module.
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The output buffer format is:
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<DT id="9"><DD>
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struct module_info {
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<BR> unsigned long address;
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<BR> unsigned long size;
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<BR> unsigned long flags;
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};
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<DT id="10"><DD>
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where
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<I>address</I>
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is the kernel address at which the module resides,
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<I>size</I>
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is the size of the module in bytes, and
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<I>flags</I>
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is a mask of
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<B>MOD_RUNNING</B>,
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<B>MOD_AUTOCLEAN</B>,
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and so on, that indicates the current status of the module
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(see the Linux kernel source file
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<I>include/linux/module.h</I>).
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<I>ret</I>
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is set to the size of the
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<I>module_info</I>
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structure.
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</DL>
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success, zero is returned.
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On error, -1 is returned and
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<I>errno</I>
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is set appropriately.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="11"><B>EFAULT</B>
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<DD>
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At least one of
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<I>name</I>,
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<I>buf</I>,
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or
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<I>ret</I>
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was outside the program's accessible address space.
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<DT id="12"><B>EINVAL</B>
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<DD>
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Invalid
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<I>which</I>;
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or
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<I>name</I>
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is NULL (indicating "the kernel"),
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but this is not permitted with the specified value of
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<I>which</I>.
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<DT id="13"><B>ENOENT</B>
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<DD>
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No module by that
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<I>name</I>
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exists.
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<DT id="14"><B>ENOSPC</B>
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<DD>
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The buffer size provided was too small.
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<I>ret</I>
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is set to the minimum size needed.
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<DT id="15"><B>ENOSYS</B>
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<DD>
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<B>query_module</B>()
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is not supported in this version of the kernel
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(e.g., the kernel is version 2.6 or later).
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</DL>
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<A NAME="lbAG"> </A>
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<H2>VERSIONS</H2>
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This system call is present on Linux only up until kernel 2.4;
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it was removed in Linux 2.6.
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<A NAME="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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<B>query_module</B>()
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is Linux-specific.
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<A NAME="lbAI"> </A>
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<H2>NOTES</H2>
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Some of the information that was formerly available via
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<B>query_module</B>()
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can be obtained from
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<I>/proc/modules</I>,
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<I>/proc/kallsyms</I>,
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and the files under the directory
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<I>/sys/module</I>.
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<P>
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The
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<B>query_module</B>()
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system call is not supported by glibc.
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No declaration is provided in glibc headers, but,
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through a quirk of history, glibc does export an ABI for this system call.
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Therefore, in order to employ this system call,
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it is sufficient to manually declare the interface in your code;
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alternatively, you can invoke the system call using
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<B><A HREF="/cgi-bin/man/man2html?2+syscall">syscall</A></B>(2).
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+create_module">create_module</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+delete_module">delete_module</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+get_kernel_syms">get_kernel_syms</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+init_module">init_module</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?8+lsmod">lsmod</A></B>(8),
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<B><A HREF="/cgi-bin/man/man2html?8+modinfo">modinfo</A></B>(8)
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<A NAME="lbAK"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="16"><A HREF="#lbAB">NAME</A><DD>
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<DT id="17"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="18"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="19"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="20"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="21"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="22"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="23"><A HREF="#lbAI">NOTES</A><DD>
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<DT id="24"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="25"><A HREF="#lbAK">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:33 GMT, March 31, 2021
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