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<a name="1205285"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">15.7 Fatal run-time errors</font>
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<a name="1205286"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The C run-time system is able to detect various run-time errors and report these to the user. The behavior on detecting a fatal error is as follows:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li value="1"><a name="1205290"> </a>Set the run-time library variable <font size=2 face=Courier><strong>errno</strong></font> to an error-specific value.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li value="2"><a name="1205291"> </a>Display an error message. The message can only be displayed if the debugger is in use or if the application is run on the simulator in stand-alone mode.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li value="3"><a name="1205292"> </a>Trigger a breakpoint. If a debugger is present then it detects the breakpoint and behaves as if a user breakpoint has been hit. This causes the debugger to backtrace to the offending function call or code sequence.</font></p>
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<dt> <a name="1205293"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">If no debugger is present then the breakpoint is ignored.</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li value="4"><a name="1205295"> </a>Raise the <font size=2 face=Courier><strong>SIGTERM</strong></font> signal. The default signal handler for <font size=2 face=Courier><strong>SIGTERM</strong></font> causes the program to exit with the value <font size=2 face=Courier><strong>EXIT_FAILURE</strong></font>. This behavior can be modified by installing a user handler for the <font size=2 face=Courier><strong>SIGTERM</strong></font> signal. A user handler can determine which error has occurred by checking the value of <font size=2 face=Courier><strong>errno</strong></font>. Installation of a user signal handler is achieved using the <font size=2 face=Courier><strong>signal</strong></font> function:</font></p>
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<dt> <a name="1205296"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>void myhandler(int </strong></font><font size=2 face=Courier><strong><em>sig</em></strong></font><font size=2 face=Courier><strong>)<br>{<br>⌨️ 快捷键说明
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