172 lines
9.6 KiB
HTML
172 lines
9.6 KiB
HTML
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>OS Information - Debugging with GDB</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="Debugging with GDB">
|
||
|
|
<meta name="generator" content="makeinfo 4.13">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="up" href="Data.html#Data" title="Data">
|
||
|
|
<link rel="prev" href="Vector-Unit.html#Vector-Unit" title="Vector Unit">
|
||
|
|
<link rel="next" href="Memory-Region-Attributes.html#Memory-Region-Attributes" title="Memory Region Attributes">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
Copyright (C) 1988-2019 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
||
|
|
any later version published by the Free Software Foundation; with the
|
||
|
|
Invariant Sections being ``Free Software'' and ``Free Software Needs
|
||
|
|
Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,''
|
||
|
|
and with the Back-Cover Texts as in (a) below.
|
||
|
|
|
||
|
|
(a) The FSF's Back-Cover Text is: ``You are free to copy and modify
|
||
|
|
this GNU Manual. Buying copies from GNU Press supports the FSF in
|
||
|
|
developing GNU and promoting software freedom.''
|
||
|
|
-->
|
||
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
||
|
|
<style type="text/css"><!--
|
||
|
|
pre.display { font-family:inherit }
|
||
|
|
pre.format { font-family:inherit }
|
||
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallexample { font-size:smaller }
|
||
|
|
pre.smalllisp { font-size:smaller }
|
||
|
|
span.sc { font-variant:small-caps }
|
||
|
|
span.roman { font-family:serif; font-weight:normal; }
|
||
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<a name="OS-Information"></a>
|
||
|
|
<p>
|
||
|
|
Next: <a rel="next" accesskey="n" href="Memory-Region-Attributes.html#Memory-Region-Attributes">Memory Region Attributes</a>,
|
||
|
|
Previous: <a rel="previous" accesskey="p" href="Vector-Unit.html#Vector-Unit">Vector Unit</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="Data.html#Data">Data</a>
|
||
|
|
<hr>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h3 class="section">10.16 Operating System Auxiliary Information</h3>
|
||
|
|
|
||
|
|
<p><a name="index-OS-information-768"></a>
|
||
|
|
<span class="sc">gdb</span> provides interfaces to useful OS facilities that can help
|
||
|
|
you debug your program.
|
||
|
|
|
||
|
|
<p><a name="index-auxiliary-vector-769"></a><a name="index-vector_002c-auxiliary-770"></a>Some operating systems supply an <dfn>auxiliary vector</dfn> to programs at
|
||
|
|
startup. This is akin to the arguments and environment that you
|
||
|
|
specify for a program, but contains a system-dependent variety of
|
||
|
|
binary values that tell system libraries important details about the
|
||
|
|
hardware, operating system, and process. Each value's purpose is
|
||
|
|
identified by an integer tag; the meanings are well-known but system-specific.
|
||
|
|
Depending on the configuration and operating system facilities,
|
||
|
|
<span class="sc">gdb</span> may be able to show you this information. For remote
|
||
|
|
targets, this functionality may further depend on the remote stub's
|
||
|
|
support of the ‘<samp><span class="samp">qXfer:auxv:read</span></samp>’ packet, see
|
||
|
|
<a href="qXfer-auxiliary-vector-read.html#qXfer-auxiliary-vector-read">qXfer auxiliary vector read</a>.
|
||
|
|
|
||
|
|
|
||
|
|
<a name="index-info-auxv-771"></a>
|
||
|
|
<dl><dt><code>info auxv</code><dd>Display the auxiliary vector of the inferior, which can be either a
|
||
|
|
live process or a core dump file. <span class="sc">gdb</span> prints each tag value
|
||
|
|
numerically, and also shows names and text descriptions for recognized
|
||
|
|
tags. Some values in the vector are numbers, some bit masks, and some
|
||
|
|
pointers to strings or other data. <span class="sc">gdb</span> displays each value in the
|
||
|
|
most appropriate form for a recognized tag, and in hexadecimal for
|
||
|
|
an unrecognized tag.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<p>On some targets, <span class="sc">gdb</span> can access operating system-specific
|
||
|
|
information and show it to you. The types of information available
|
||
|
|
will differ depending on the type of operating system running on the
|
||
|
|
target. The mechanism used to fetch the data is described in
|
||
|
|
<a href="Operating-System-Information.html#Operating-System-Information">Operating System Information</a>. For remote targets, this
|
||
|
|
functionality depends on the remote stub's support of the
|
||
|
|
‘<samp><span class="samp">qXfer:osdata:read</span></samp>’ packet, see <a href="qXfer-osdata-read.html#qXfer-osdata-read">qXfer osdata read</a>.
|
||
|
|
|
||
|
|
|
||
|
|
<a name="index-info-os-772"></a>
|
||
|
|
<dl><dt><code>info os </code><var>infotype</var><dd>
|
||
|
|
Display OS information of the requested type.
|
||
|
|
|
||
|
|
<p>On <span class="sc">gnu</span>/Linux, the following values of <var>infotype</var> are valid:
|
||
|
|
|
||
|
|
<p><a name="linux-info-os-infotypes"></a>
|
||
|
|
|
||
|
|
<a name="index-info-os-cpus-773"></a>
|
||
|
|
<dl><dt><code>cpus</code><dd>Display the list of all CPUs/cores. For each CPU/core, <span class="sc">gdb</span> prints
|
||
|
|
the available fields from /proc/cpuinfo. For each supported architecture
|
||
|
|
different fields are available. Two common entries are processor which gives
|
||
|
|
CPU number and bogomips; a system constant that is calculated during
|
||
|
|
kernel initialization.
|
||
|
|
|
||
|
|
<p><a name="index-info-os-files-774"></a><br><dt><code>files</code><dd>Display the list of open file descriptors on the target. For each
|
||
|
|
file descriptor, <span class="sc">gdb</span> prints the identifier of the process
|
||
|
|
owning the descriptor, the command of the owning process, the value
|
||
|
|
of the descriptor, and the target of the descriptor.
|
||
|
|
|
||
|
|
<p><a name="index-info-os-modules-775"></a><br><dt><code>modules</code><dd>Display the list of all loaded kernel modules on the target. For each
|
||
|
|
module, <span class="sc">gdb</span> prints the module name, the size of the module in
|
||
|
|
bytes, the number of times the module is used, the dependencies of the
|
||
|
|
module, the status of the module, and the address of the loaded module
|
||
|
|
in memory.
|
||
|
|
|
||
|
|
<p><a name="index-info-os-msg-776"></a><br><dt><code>msg</code><dd>Display the list of all System V message queues on the target. For each
|
||
|
|
message queue, <span class="sc">gdb</span> prints the message queue key, the message
|
||
|
|
queue identifier, the access permissions, the current number of bytes
|
||
|
|
on the queue, the current number of messages on the queue, the processes
|
||
|
|
that last sent and received a message on the queue, the user and group
|
||
|
|
of the owner and creator of the message queue, the times at which a
|
||
|
|
message was last sent and received on the queue, and the time at which
|
||
|
|
the message queue was last changed.
|
||
|
|
|
||
|
|
<p><a name="index-info-os-processes-777"></a><br><dt><code>processes</code><dd>Display the list of processes on the target. For each process,
|
||
|
|
<span class="sc">gdb</span> prints the process identifier, the name of the user, the
|
||
|
|
command corresponding to the process, and the list of processor cores
|
||
|
|
that the process is currently running on. (To understand what these
|
||
|
|
properties mean, for this and the following info types, please consult
|
||
|
|
the general <span class="sc">gnu</span>/Linux documentation.)
|
||
|
|
|
||
|
|
<p><a name="index-info-os-procgroups-778"></a><br><dt><code>procgroups</code><dd>Display the list of process groups on the target. For each process,
|
||
|
|
<span class="sc">gdb</span> prints the identifier of the process group that it belongs
|
||
|
|
to, the command corresponding to the process group leader, the process
|
||
|
|
identifier, and the command line of the process. The list is sorted
|
||
|
|
first by the process group identifier, then by the process identifier,
|
||
|
|
so that processes belonging to the same process group are grouped together
|
||
|
|
and the process group leader is listed first.
|
||
|
|
|
||
|
|
<p><a name="index-info-os-semaphores-779"></a><br><dt><code>semaphores</code><dd>Display the list of all System V semaphore sets on the target. For each
|
||
|
|
semaphore set, <span class="sc">gdb</span> prints the semaphore set key, the semaphore
|
||
|
|
set identifier, the access permissions, the number of semaphores in the
|
||
|
|
set, the user and group of the owner and creator of the semaphore set,
|
||
|
|
and the times at which the semaphore set was operated upon and changed.
|
||
|
|
|
||
|
|
<p><a name="index-info-os-shm-780"></a><br><dt><code>shm</code><dd>Display the list of all System V shared-memory regions on the target.
|
||
|
|
For each shared-memory region, <span class="sc">gdb</span> prints the region key,
|
||
|
|
the shared-memory identifier, the access permissions, the size of the
|
||
|
|
region, the process that created the region, the process that last
|
||
|
|
attached to or detached from the region, the current number of live
|
||
|
|
attaches to the region, and the times at which the region was last
|
||
|
|
attached to, detach from, and changed.
|
||
|
|
|
||
|
|
<p><a name="index-info-os-sockets-781"></a><br><dt><code>sockets</code><dd>Display the list of Internet-domain sockets on the target. For each
|
||
|
|
socket, <span class="sc">gdb</span> prints the address and port of the local and
|
||
|
|
remote endpoints, the current state of the connection, the creator of
|
||
|
|
the socket, the IP address family of the socket, and the type of the
|
||
|
|
connection.
|
||
|
|
|
||
|
|
<p><a name="index-info-os-threads-782"></a><br><dt><code>threads</code><dd>Display the list of threads running on the target. For each thread,
|
||
|
|
<span class="sc">gdb</span> prints the identifier of the process that the thread
|
||
|
|
belongs to, the command of the process, the thread identifier, and the
|
||
|
|
processor core that it is currently running on. The main thread of a
|
||
|
|
process is not listed.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<br><dt><code>info os</code><dd>If <var>infotype</var> is omitted, then list the possible values for
|
||
|
|
<var>infotype</var> and the kind of OS information available for each
|
||
|
|
<var>infotype</var>. If the target does not return a list of possible
|
||
|
|
types, this command will report an error.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
</body></html>
|
||
|
|
|