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<a name="Error-reporting"></a>
<div class="header">
<p>
Next: <a href="Miscellaneous.html#Miscellaneous" accesskey="n" rel="next">Miscellaneous</a>, Previous: <a href="typedef-bfd.html#typedef-bfd" accesskey="p" rel="prev">typedef bfd</a>, Up: <a href="BFD-front-end.html#BFD-front-end" accesskey="u" rel="up">BFD front end</a> &nbsp; [<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>
</div>
<hr>
<a name="Error-reporting-1"></a>
<h3 class="section">2.2 Error reporting</h3>
<p>Most BFD functions return nonzero on success (check their
individual documentation for precise semantics).  On an error,
they call <code>bfd_set_error</code> to set an error condition that callers
can check by calling <code>bfd_get_error</code>.
If that returns <code>bfd_error_system_call</code>, then check
<code>errno</code>.
</p>
<p>The easiest way to report a BFD error to the user is to
use <code>bfd_perror</code>.
</p>
<a name="Type-bfd_005ferror_005ftype"></a>
<h4 class="subsection">2.2.1 Type <code>bfd_error_type</code></h4>
<p>The values returned by <code>bfd_get_error</code> are defined by the
enumerated type <code>bfd_error_type</code>.
</p>

<div class="example">
<pre class="example">
typedef enum bfd_error
{
  bfd_error_no_error = 0,
  bfd_error_system_call,
  bfd_error_invalid_target,
  bfd_error_wrong_format,
  bfd_error_wrong_object_format,
  bfd_error_invalid_operation,
  bfd_error_no_memory,
  bfd_error_no_symbols,
  bfd_error_no_armap,
  bfd_error_no_more_archived_files,
  bfd_error_malformed_archive,
  bfd_error_missing_dso,
  bfd_error_file_not_recognized,
  bfd_error_file_ambiguously_recognized,
  bfd_error_no_contents,
  bfd_error_nonrepresentable_section,
  bfd_error_no_debug_section,
  bfd_error_bad_value,
  bfd_error_file_truncated,
  bfd_error_file_too_big,
  bfd_error_on_input,
  bfd_error_invalid_error_code
}
bfd_error_type;

</pre></div>
<a name="index-bfd_005fget_005ferror"></a>
<a name="bfd_005fget_005ferror"></a>
<h4 class="subsubsection">2.2.1.1 <code>bfd_get_error</code></h4>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">bfd_error_type bfd_get_error (void);
</pre></div>
<p><strong>Description</strong><br>
Return the current BFD error condition.
</p>
<a name="index-bfd_005fset_005ferror"></a>
<a name="bfd_005fset_005ferror"></a>
<h4 class="subsubsection">2.2.1.2 <code>bfd_set_error</code></h4>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">void bfd_set_error (bfd_error_type error_tag, ...);
</pre></div>
<p><strong>Description</strong><br>
Set the BFD error condition to be <var>error_tag</var>.
If <var>error_tag</var> is bfd_error_on_input, then this function
takes two more parameters, the input bfd where the error
occurred, and the bfd_error_type error.
</p>
<a name="index-bfd_005ferrmsg"></a>
<a name="bfd_005ferrmsg"></a>
<h4 class="subsubsection">2.2.1.3 <code>bfd_errmsg</code></h4>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">const char *bfd_errmsg (bfd_error_type error_tag);
</pre></div>
<p><strong>Description</strong><br>
Return a string describing the error <var>error_tag</var>, or
the system error if <var>error_tag</var> is <code>bfd_error_system_call</code>.
</p>
<a name="index-bfd_005fperror"></a>
<a name="bfd_005fperror"></a>
<h4 class="subsubsection">2.2.1.4 <code>bfd_perror</code></h4>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">void bfd_perror (const char *message);
</pre></div>
<p><strong>Description</strong><br>
Print to the standard error stream a string describing the
last BFD error that occurred, or the last system error if
the last BFD error was a system call failure.  If <var>message</var>
is non-NULL and non-empty, the error string printed is preceded
by <var>message</var>, a colon, and a space.  It is followed by a newline.
</p>
<a name="BFD-error-handler"></a>
<h4 class="subsection">2.2.2 BFD error handler</h4>
<p>Some BFD functions want to print messages describing the
problem.  They call a BFD error handler function.  This
function may be overridden by the program.
</p>
<p>The BFD error handler acts like vprintf.
</p>

<div class="example">
<pre class="example">
typedef void (*bfd_error_handler_type) (const char *, va_list);

</pre></div>
<a name="index-bfd_005fset_005ferror_005fhandler"></a>
<a name="bfd_005fset_005ferror_005fhandler"></a>
<h4 class="subsubsection">2.2.2.1 <code>bfd_set_error_handler</code></h4>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">bfd_error_handler_type bfd_set_error_handler (bfd_error_handler_type);
</pre></div>
<p><strong>Description</strong><br>
Set the BFD error handler function.  Returns the previous
function.
</p>
<a name="index-bfd_005fset_005ferror_005fprogram_005fname"></a>
<a name="bfd_005fset_005ferror_005fprogram_005fname"></a>
<h4 class="subsubsection">2.2.2.2 <code>bfd_set_error_program_name</code></h4>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">void bfd_set_error_program_name (const char *);
</pre></div>
<p><strong>Description</strong><br>
Set the program name to use when printing a BFD error.  This
is printed before the error message followed by a colon and
space.  The string must not be changed after it is passed to
this function.
</p>
<a name="BFD-assert-handler"></a>
<h4 class="subsection">2.2.3 BFD assert handler</h4>
<p>If BFD finds an internal inconsistency, the bfd assert
handler is called with information on the BFD version, BFD
source file and line.  If this happens, most programs linked
against BFD are expected to want to exit with an error, or mark
the current BFD operation as failed, so it is recommended to
override the default handler, which just calls
_bfd_error_handler and continues.
</p>

<div class="example">
<pre class="example">
typedef void (*bfd_assert_handler_type) (const char *bfd_formatmsg,
                                         const char *bfd_version,
                                         const char *bfd_file,
                                         int bfd_line);

</pre></div>
<a name="index-bfd_005fset_005fassert_005fhandler"></a>
<a name="bfd_005fset_005fassert_005fhandler"></a>
<h4 class="subsubsection">2.2.3.1 <code>bfd_set_assert_handler</code></h4>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">bfd_assert_handler_type bfd_set_assert_handler (bfd_assert_handler_type);
</pre></div>
<p><strong>Description</strong><br>
Set the BFD assert handler function.  Returns the previous
function.
</p>
<hr>
<div class="header">
<p>
Next: <a href="Miscellaneous.html#Miscellaneous" accesskey="n" rel="next">Miscellaneous</a>, Previous: <a href="typedef-bfd.html#typedef-bfd" accesskey="p" rel="prev">typedef bfd</a>, Up: <a href="BFD-front-end.html#BFD-front-end" accesskey="u" rel="up">BFD front end</a> &nbsp; [<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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