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196 lines
7.8 KiB
HTML
196 lines
7.8 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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<!-- This file documents the BFD library.
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Copyright (C) 1991-2019 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 "GNU General Public License" and "Funding
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Free Software", the Front-Cover texts being (a) (see below), and with
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the Back-Cover Texts being (b) (see below). A copy of the license is
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included in the section entitled "GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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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>Formats (Untitled Document)</title>
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<meta name="description" content="Formats (Untitled Document)">
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<meta name="keywords" content="Formats (Untitled Document)">
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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="BFD-Index.html#BFD-Index" rel="index" title="BFD Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="BFD-front-end.html#BFD-front-end" rel="up" title="BFD front end">
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<link href="Relocations.html#Relocations" rel="next" title="Relocations">
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<link href="Archives.html#Archives" rel="prev" title="Archives">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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div.display {margin-left: 3.2em}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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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="Formats"></a>
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<div class="header">
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<p>
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Next: <a href="Relocations.html#Relocations" accesskey="n" rel="next">Relocations</a>, Previous: <a href="Archives.html#Archives" accesskey="p" rel="prev">Archives</a>, Up: <a href="BFD-front-end.html#BFD-front-end" accesskey="u" rel="up">BFD front end</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="File-formats"></a>
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<h3 class="section">2.9 File formats</h3>
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<p>A format is a BFD concept of high level file contents type. The
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formats supported by BFD are:
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</p>
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<ul>
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<li> <code>bfd_object</code>
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</li></ul>
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<p>The BFD may contain data, symbols, relocations and debug info.
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</p>
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<ul>
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<li> <code>bfd_archive</code>
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</li></ul>
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<p>The BFD contains other BFDs and an optional index.
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</p>
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<ul>
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<li> <code>bfd_core</code>
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</li></ul>
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<p>The BFD contains the result of an executable core dump.
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</p>
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<a name="File-format-functions"></a>
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<h4 class="subsection">2.9.1 File format functions</h4>
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<a name="index-bfd_005fcheck_005fformat"></a>
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<a name="bfd_005fcheck_005fformat"></a>
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<h4 class="subsubsection">2.9.1.1 <code>bfd_check_format</code></h4>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">bfd_boolean bfd_check_format (bfd *abfd, bfd_format format);
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</pre></div>
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<p><strong>Description</strong><br>
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Verify if the file attached to the BFD <var>abfd</var> is compatible
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with the format <var>format</var> (i.e., one of <code>bfd_object</code>,
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<code>bfd_archive</code> or <code>bfd_core</code>).
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</p>
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<p>If the BFD has been set to a specific target before the
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call, only the named target and format combination is
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checked. If the target has not been set, or has been set to
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<code>default</code>, then all the known target backends is
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interrogated to determine a match. If the default target
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matches, it is used. If not, exactly one target must recognize
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the file, or an error results.
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</p>
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<p>The function returns <code>TRUE</code> on success, otherwise <code>FALSE</code>
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with one of the following error codes:
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</p>
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<ul>
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<li> <code>bfd_error_invalid_operation</code> -
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if <code>format</code> is not one of <code>bfd_object</code>, <code>bfd_archive</code> or
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<code>bfd_core</code>.
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</li><li> <code>bfd_error_system_call</code> -
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if an error occured during a read - even some file mismatches
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can cause bfd_error_system_calls.
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</li><li> <code>file_not_recognised</code> -
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none of the backends recognised the file format.
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</li><li> <code>bfd_error_file_ambiguously_recognized</code> -
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more than one backend recognised the file format.
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</li></ul>
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<a name="index-bfd_005fcheck_005fformat_005fmatches"></a>
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<a name="bfd_005fcheck_005fformat_005fmatches"></a>
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<h4 class="subsubsection">2.9.1.2 <code>bfd_check_format_matches</code></h4>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">bfd_boolean bfd_check_format_matches
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(bfd *abfd, bfd_format format, char ***matching);
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</pre></div>
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<p><strong>Description</strong><br>
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Like <code>bfd_check_format</code>, except when it returns FALSE with
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<code>bfd_errno</code> set to <code>bfd_error_file_ambiguously_recognized</code>. In that
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case, if <var>matching</var> is not NULL, it will be filled in with
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a NULL-terminated list of the names of the formats that matched,
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allocated with <code>malloc</code>.
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Then the user may choose a format and try again.
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</p>
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<p>When done with the list that <var>matching</var> points to, the caller
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should free it.
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</p>
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<a name="index-bfd_005fset_005fformat"></a>
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<a name="bfd_005fset_005fformat"></a>
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<h4 class="subsubsection">2.9.1.3 <code>bfd_set_format</code></h4>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">bfd_boolean bfd_set_format (bfd *abfd, bfd_format format);
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</pre></div>
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<p><strong>Description</strong><br>
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This function sets the file format of the BFD <var>abfd</var> to the
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format <var>format</var>. If the target set in the BFD does not
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support the format requested, the format is invalid, or the BFD
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is not open for writing, then an error occurs.
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</p>
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<a name="index-bfd_005fformat_005fstring"></a>
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<a name="bfd_005fformat_005fstring"></a>
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<h4 class="subsubsection">2.9.1.4 <code>bfd_format_string</code></h4>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">const char *bfd_format_string (bfd_format format);
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</pre></div>
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<p><strong>Description</strong><br>
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Return a pointer to a const string
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<code>invalid</code>, <code>object</code>, <code>archive</code>, <code>core</code>, or <code>unknown</code>,
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depending upon the value of <var>format</var>.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Relocations.html#Relocations" accesskey="n" rel="next">Relocations</a>, Previous: <a href="Archives.html#Archives" accesskey="p" rel="prev">Archives</a>, Up: <a href="BFD-front-end.html#BFD-front-end" accesskey="u" rel="up">BFD front end</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-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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