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| <h2 class="chapter">2 Error Reporting</h2> |
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| <!-- %MENU% How library functions report errors --> |
| <p><a name="index-error-reporting-54"></a><a name="index-reporting-errors-55"></a><a name="index-error-codes-56"></a><a name="index-status-codes-57"></a> |
| Many functions in the GNU C library detect and report error conditions, |
| and sometimes your programs need to check for these error conditions. |
| For example, when you open an input file, you should verify that the |
| file was actually opened correctly, and print an error message or take |
| other appropriate action if the call to the library function failed. |
| |
| <p>This chapter describes how the error reporting facility works. Your |
| program should include the header file <samp><span class="file">errno.h</span></samp> to use this |
| facility. |
| <a name="index-errno_002eh-58"></a> |
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| <ul class="menu"> |
| <li><a accesskey="1" href="Checking-for-Errors.html#Checking-for-Errors">Checking for Errors</a>: How errors are reported by library functions. |
| <li><a accesskey="2" href="Error-Codes.html#Error-Codes">Error Codes</a>: Error code macros; all of these expand |
| into integer constant values. |
| <li><a accesskey="3" href="Error-Messages.html#Error-Messages">Error Messages</a>: Mapping error codes onto error messages. |
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