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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gdb/Environment.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gdb/Environment.html b/share/doc/gdb/Environment.html new file mode 100644 index 0000000..427e5fe --- /dev/null +++ b/share/doc/gdb/Environment.html @@ -0,0 +1,179 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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." --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: Environment</title> + +<meta name="description" content="Debugging with GDB: Environment"> +<meta name="keywords" content="Debugging with GDB: Environment"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Running.html#Running" rel="up" title="Running"> +<link href="Working-Directory.html#Working-Directory" rel="next" title="Working Directory"> +<link href="Arguments.html#Arguments" rel="previous" title="Arguments"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Environment"></a> +<div class="header"> +<p> +Next: <a href="Working-Directory.html#Working-Directory" accesskey="n" rel="next">Working Directory</a>, Previous: <a href="Arguments.html#Arguments" accesskey="p" rel="previous">Arguments</a>, Up: <a href="Running.html#Running" accesskey="u" rel="up">Running</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> +</div> +<hr> +<a name="Your-Program_0027s-Environment"></a> +<h3 class="section">4.4 Your Program’s Environment</h3> + +<a name="index-environment-_0028of-your-program_0029"></a> +<p>The <em>environment</em> consists of a set of environment variables and +their values. Environment variables conventionally record such things as +your user name, your home directory, your terminal type, and your search +path for programs to run. Usually you set up environment variables with +the shell and they are inherited by all the other programs you run. When +debugging, it can be useful to try running your program with a modified +environment without having to start <small>GDB</small> over again. +</p> +<dl compact="compact"> +<dd><a name="index-path"></a> +</dd> +<dt><code>path <var>directory</var></code></dt> +<dd><p>Add <var>directory</var> to the front of the <code>PATH</code> environment variable +(the search path for executables) that will be passed to your program. +The value of <code>PATH</code> used by <small>GDB</small> does not change. +You may specify several directory names, separated by whitespace or by a +system-dependent separator character (‘<samp>:</samp>’ on Unix, ‘<samp>;</samp>’ on +MS-DOS and MS-Windows). If <var>directory</var> is already in the path, it +is moved to the front, so it is searched sooner. +</p> +<p>You can use the string ‘<samp>$cwd</samp>’ to refer to whatever is the current +working directory at the time <small>GDB</small> searches the path. If you +use ‘<samp>.</samp>’ instead, it refers to the directory where you executed the +<code>path</code> command. <small>GDB</small> replaces ‘<samp>.</samp>’ in the +<var>directory</var> argument (with the current path) before adding +<var>directory</var> to the search path. +</p> +<a name="index-show-paths"></a> +</dd> +<dt><code>show paths</code></dt> +<dd><p>Display the list of search paths for executables (the <code>PATH</code> +environment variable). +</p> +<a name="index-show-environment"></a> +</dd> +<dt><code>show environment <span class="roman">[</span><var>varname</var><span class="roman">]</span></code></dt> +<dd><p>Print the value of environment variable <var>varname</var> to be given to +your program when it starts. If you do not supply <var>varname</var>, +print the names and values of all environment variables to be given to +your program. You can abbreviate <code>environment</code> as <code>env</code>. +</p> +<a name="index-set-environment"></a> +<a name="set-environment"></a></dd> +<dt><code>set environment <var>varname</var> <span class="roman">[</span>=<var>value</var><span class="roman">]</span></code></dt> +<dd><p>Set environment variable <var>varname</var> to <var>value</var>. The value +changes for your program (and the shell <small>GDB</small> uses to launch +it), not for <small>GDB</small> itself. The <var>value</var> may be any string; the +values of environment variables are just strings, and any +interpretation is supplied by your program itself. The <var>value</var> +parameter is optional; if it is eliminated, the variable is set to a +null value. +</p> +<p>For example, this command: +</p> +<div class="smallexample"> +<pre class="smallexample">set env USER = foo +</pre></div> + +<p>tells the debugged program, when subsequently run, that its user is named +‘<samp>foo</samp>’. (The spaces around ‘<samp>=</samp>’ are used for clarity here; they +are not actually required.) +</p> +<p>Note that on Unix systems, <small>GDB</small> runs your program via a shell, +which also inherits the environment set with <code>set environment</code>. +If necessary, you can avoid that by using the ‘<samp>env</samp>’ program as a +wrapper instead of using <code>set environment</code>. See <a href="Starting.html#set-exec_002dwrapper">set exec-wrapper</a>, for an example doing just that. +</p> +<p>Environment variables that are set by the user are also transmitted to +<code>gdbserver</code> to be used when starting the remote inferior. +see <a href="General-Query-Packets.html#QEnvironmentHexEncoded">QEnvironmentHexEncoded</a>. +</p> +<a name="index-unset-environment"></a> +<a name="unset-environment"></a></dd> +<dt><code>unset environment <var>varname</var></code></dt> +<dd><p>Remove variable <var>varname</var> from the environment to be passed to your +program. This is different from ‘<samp>set env <var>varname</var> =</samp>’; +<code>unset environment</code> removes the variable from the environment, +rather than assigning it an empty value. +</p> +<p>Environment variables that are unset by the user are also unset on +<code>gdbserver</code> when starting the remote inferior. +see <a href="General-Query-Packets.html#QEnvironmentUnset">QEnvironmentUnset</a>. +</p></dd> +</dl> + +<p><em>Warning:</em> On Unix systems, <small>GDB</small> runs your program using +the shell indicated by your <code>SHELL</code> environment variable if it +exists (or <code>/bin/sh</code> if not). If your <code>SHELL</code> variable +names a shell that runs an initialization file when started +non-interactively—such as <samp>.cshrc</samp> for C-shell, $<samp>.zshenv</samp> +for the Z shell, or the file specified in the <code>BASH_ENV</code> +environment variable for BASH—any variables you set in that file +affect your program. You may wish to move setting of environment +variables to files that are only run when you sign on, such as +<samp>.login</samp> or <samp>.profile</samp>. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="Working-Directory.html#Working-Directory" accesskey="n" rel="next">Working Directory</a>, Previous: <a href="Arguments.html#Arguments" accesskey="p" rel="previous">Arguments</a>, Up: <a href="Running.html#Running" accesskey="u" rel="up">Running</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> +</div> + + + +</body> +</html> |