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| <a name="OS-Information"></a> |
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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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| <a name="Operating-System-Auxiliary-Information"></a> |
| <h3 class="section">10.16 Operating System Auxiliary Information</h3> |
| <a name="index-OS-information"></a> |
| |
| <p><small>GDB</small> provides interfaces to useful OS facilities that can help |
| you debug your program. |
| </p> |
| <a name="index-auxiliary-vector"></a> |
| <a name="index-vector_002c-auxiliary"></a> |
| <p>Some operating systems supply an <em>auxiliary vector</em> 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, |
| <small>GDB</small> 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>qXfer:auxv:read</samp>’ packet, see |
| <a href="General-Query-Packets.html#qXfer-auxiliary-vector-read">qXfer auxiliary vector read</a>. |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-info-auxv"></a> |
| </dd> |
| <dt><code>info auxv</code></dt> |
| <dd><p>Display the auxiliary vector of the inferior, which can be either a |
| live process or a core dump file. <small>GDB</small> 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. <small>GDB</small> displays each value in the |
| most appropriate form for a recognized tag, and in hexadecimal for |
| an unrecognized tag. |
| </p></dd> |
| </dl> |
| |
| <p>On some targets, <small>GDB</small> 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>qXfer:osdata:read</samp>’ packet, see <a href="General-Query-Packets.html#qXfer-osdata-read">qXfer osdata read</a>. |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-info-os"></a> |
| </dd> |
| <dt><code>info os <var>infotype</var></code></dt> |
| <dd> |
| <p>Display OS information of the requested type. |
| </p> |
| <p>On <small>GNU</small>/Linux, the following values of <var>infotype</var> are valid: |
| </p> |
| <a name="linux-info-os-infotypes"></a><dl compact="compact"> |
| <dd><a name="index-info-os-cpus"></a> |
| </dd> |
| <dt><code>cpus</code></dt> |
| <dd><p>Display the list of all CPUs/cores. For each CPU/core, <small>GDB</small> 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"></a> |
| </dd> |
| <dt><code>files</code></dt> |
| <dd><p>Display the list of open file descriptors on the target. For each |
| file descriptor, <small>GDB</small> 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"></a> |
| </dd> |
| <dt><code>modules</code></dt> |
| <dd><p>Display the list of all loaded kernel modules on the target. For each |
| module, <small>GDB</small> 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"></a> |
| </dd> |
| <dt><code>msg</code></dt> |
| <dd><p>Display the list of all System V message queues on the target. For each |
| message queue, <small>GDB</small> 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"></a> |
| </dd> |
| <dt><code>processes</code></dt> |
| <dd><p>Display the list of processes on the target. For each process, |
| <small>GDB</small> 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 <small>GNU</small>/Linux documentation.) |
| </p> |
| <a name="index-info-os-procgroups"></a> |
| </dd> |
| <dt><code>procgroups</code></dt> |
| <dd><p>Display the list of process groups on the target. For each process, |
| <small>GDB</small> 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"></a> |
| </dd> |
| <dt><code>semaphores</code></dt> |
| <dd><p>Display the list of all System V semaphore sets on the target. For each |
| semaphore set, <small>GDB</small> 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"></a> |
| </dd> |
| <dt><code>shm</code></dt> |
| <dd><p>Display the list of all System V shared-memory regions on the target. |
| For each shared-memory region, <small>GDB</small> 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"></a> |
| </dd> |
| <dt><code>sockets</code></dt> |
| <dd><p>Display the list of Internet-domain sockets on the target. For each |
| socket, <small>GDB</small> 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"></a> |
| </dd> |
| <dt><code>threads</code></dt> |
| <dd><p>Display the list of threads running on the target. For each thread, |
| <small>GDB</small> 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. |
| </p></dd> |
| </dl> |
| |
| </dd> |
| <dt><code>info os</code></dt> |
| <dd><p>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. |
| </p></dd> |
| </dl> |
| |
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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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