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240 lines
11 KiB
HTML
240 lines
11 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>OS Information (Debugging with GDB)</title>
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<meta name="description" content="OS Information (Debugging with GDB)">
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<meta name="keywords" content="OS Information (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Data.html#Data" rel="up" title="Data">
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<link href="Memory-Region-Attributes.html#Memory-Region-Attributes" rel="next" title="Memory Region Attributes">
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<link href="Vector-Unit.html#Vector-Unit" rel="prev" title="Vector Unit">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="OS-Information"></a>
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<div class="header">
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<p>
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Next: <a href="Memory-Region-Attributes.html#Memory-Region-Attributes" accesskey="n" rel="next">Memory Region Attributes</a>, Previous: <a href="Vector-Unit.html#Vector-Unit" accesskey="p" rel="prev">Vector Unit</a>, Up: <a href="Data.html#Data" accesskey="u" rel="up">Data</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Operating-System-Auxiliary-Information"></a>
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<h3 class="section">10.16 Operating System Auxiliary Information</h3>
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<a name="index-OS-information"></a>
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<p><small>GDB</small> provides interfaces to useful OS facilities that can help
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you debug your program.
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</p>
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<a name="index-auxiliary-vector"></a>
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<a name="index-vector_002c-auxiliary"></a>
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<p>Some operating systems supply an <em>auxiliary vector</em> to programs at
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startup. This is akin to the arguments and environment that you
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specify for a program, but contains a system-dependent variety of
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binary values that tell system libraries important details about the
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hardware, operating system, and process. Each value’s purpose is
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identified by an integer tag; the meanings are well-known but system-specific.
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Depending on the configuration and operating system facilities,
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<small>GDB</small> may be able to show you this information. For remote
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targets, this functionality may further depend on the remote stub’s
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support of the ‘<samp>qXfer:auxv:read</samp>’ packet, see
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<a href="General-Query-Packets.html#qXfer-auxiliary-vector-read">qXfer auxiliary vector read</a>.
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</p>
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<dl compact="compact">
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<dd><a name="index-info-auxv"></a>
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</dd>
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<dt><code>info auxv</code></dt>
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<dd><p>Display the auxiliary vector of the inferior, which can be either a
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live process or a core dump file. <small>GDB</small> prints each tag value
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numerically, and also shows names and text descriptions for recognized
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tags. Some values in the vector are numbers, some bit masks, and some
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pointers to strings or other data. <small>GDB</small> displays each value in the
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most appropriate form for a recognized tag, and in hexadecimal for
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an unrecognized tag.
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</p></dd>
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</dl>
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<p>On some targets, <small>GDB</small> can access operating system-specific
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information and show it to you. The types of information available
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will differ depending on the type of operating system running on the
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target. The mechanism used to fetch the data is described in
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<a href="Operating-System-Information.html#Operating-System-Information">Operating System Information</a>. For remote targets, this
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functionality depends on the remote stub’s support of the
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‘<samp>qXfer:osdata:read</samp>’ packet, see <a href="General-Query-Packets.html#qXfer-osdata-read">qXfer osdata read</a>.
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</p>
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<dl compact="compact">
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<dd><a name="index-info-os"></a>
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</dd>
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<dt><code>info os <var>infotype</var></code></dt>
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<dd>
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<p>Display OS information of the requested type.
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</p>
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<p>On <small>GNU</small>/Linux, the following values of <var>infotype</var> are valid:
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</p>
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<a name="linux-info-os-infotypes"></a><dl compact="compact">
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<dd><a name="index-info-os-cpus"></a>
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</dd>
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<dt><code>cpus</code></dt>
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<dd><p>Display the list of all CPUs/cores. For each CPU/core, <small>GDB</small> prints
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the available fields from /proc/cpuinfo. For each supported architecture
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different fields are available. Two common entries are processor which gives
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CPU number and bogomips; a system constant that is calculated during
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kernel initialization.
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</p>
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<a name="index-info-os-files"></a>
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</dd>
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<dt><code>files</code></dt>
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<dd><p>Display the list of open file descriptors on the target. For each
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file descriptor, <small>GDB</small> prints the identifier of the process
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owning the descriptor, the command of the owning process, the value
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of the descriptor, and the target of the descriptor.
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</p>
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<a name="index-info-os-modules"></a>
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</dd>
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<dt><code>modules</code></dt>
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<dd><p>Display the list of all loaded kernel modules on the target. For each
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module, <small>GDB</small> prints the module name, the size of the module in
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bytes, the number of times the module is used, the dependencies of the
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module, the status of the module, and the address of the loaded module
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in memory.
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</p>
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<a name="index-info-os-msg"></a>
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</dd>
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<dt><code>msg</code></dt>
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<dd><p>Display the list of all System V message queues on the target. For each
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message queue, <small>GDB</small> prints the message queue key, the message
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queue identifier, the access permissions, the current number of bytes
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on the queue, the current number of messages on the queue, the processes
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that last sent and received a message on the queue, the user and group
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of the owner and creator of the message queue, the times at which a
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message was last sent and received on the queue, and the time at which
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the message queue was last changed.
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</p>
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<a name="index-info-os-processes"></a>
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</dd>
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<dt><code>processes</code></dt>
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<dd><p>Display the list of processes on the target. For each process,
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<small>GDB</small> prints the process identifier, the name of the user, the
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command corresponding to the process, and the list of processor cores
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that the process is currently running on. (To understand what these
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properties mean, for this and the following info types, please consult
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the general <small>GNU</small>/Linux documentation.)
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</p>
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<a name="index-info-os-procgroups"></a>
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</dd>
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<dt><code>procgroups</code></dt>
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<dd><p>Display the list of process groups on the target. For each process,
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<small>GDB</small> prints the identifier of the process group that it belongs
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to, the command corresponding to the process group leader, the process
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identifier, and the command line of the process. The list is sorted
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first by the process group identifier, then by the process identifier,
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so that processes belonging to the same process group are grouped together
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and the process group leader is listed first.
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</p>
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<a name="index-info-os-semaphores"></a>
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</dd>
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<dt><code>semaphores</code></dt>
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<dd><p>Display the list of all System V semaphore sets on the target. For each
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semaphore set, <small>GDB</small> prints the semaphore set key, the semaphore
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set identifier, the access permissions, the number of semaphores in the
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set, the user and group of the owner and creator of the semaphore set,
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and the times at which the semaphore set was operated upon and changed.
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</p>
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<a name="index-info-os-shm"></a>
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</dd>
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<dt><code>shm</code></dt>
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<dd><p>Display the list of all System V shared-memory regions on the target.
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For each shared-memory region, <small>GDB</small> prints the region key,
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the shared-memory identifier, the access permissions, the size of the
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region, the process that created the region, the process that last
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attached to or detached from the region, the current number of live
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attaches to the region, and the times at which the region was last
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attached to, detach from, and changed.
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</p>
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<a name="index-info-os-sockets"></a>
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</dd>
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<dt><code>sockets</code></dt>
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<dd><p>Display the list of Internet-domain sockets on the target. For each
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socket, <small>GDB</small> prints the address and port of the local and
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remote endpoints, the current state of the connection, the creator of
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the socket, the IP address family of the socket, and the type of the
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connection.
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</p>
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<a name="index-info-os-threads"></a>
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</dd>
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<dt><code>threads</code></dt>
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<dd><p>Display the list of threads running on the target. For each thread,
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<small>GDB</small> prints the identifier of the process that the thread
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belongs to, the command of the process, the thread identifier, and the
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processor core that it is currently running on. The main thread of a
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process is not listed.
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</p></dd>
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</dl>
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</dd>
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<dt><code>info os</code></dt>
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<dd><p>If <var>infotype</var> is omitted, then list the possible values for
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<var>infotype</var> and the kind of OS information available for each
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<var>infotype</var>. If the target does not return a list of possible
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types, this command will report an error.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Memory-Region-Attributes.html#Memory-Region-Attributes" accesskey="n" rel="next">Memory Region Attributes</a>, Previous: <a href="Vector-Unit.html#Vector-Unit" accesskey="p" rel="prev">Vector Unit</a>, Up: <a href="Data.html#Data" accesskey="u" rel="up">Data</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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