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108 lines
3.4 KiB
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>Misc Support (Embed with GNU)</title>
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<link href="index.html#Top" rel="start" title="Top">
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<link href="leds_002ec.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Libc.html#Libc" rel="up" title="Libc">
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<link href="Debugging.html#Debugging" rel="next" title="Debugging">
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<link href="Memory-Support.html#Memory-Support" rel="prev" title="Memory Support">
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<a name="Misc-Support"></a>
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<div class="header">
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<p>
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Next: <a href="Debugging.html#Debugging" accesskey="n" rel="next">Debugging</a>, Previous: <a href="Memory-Support.html#Memory-Support" accesskey="p" rel="prev">Memory Support</a>, Up: <a href="Libc.html#Libc" accesskey="u" rel="up">Libc</a> [<a href="leds_002ec.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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<hr>
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<a name="Misc-support-routines"></a>
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<h4 class="subsection">3.4.3 Misc support routines</h4>
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<p>These are called by <code>newlib</code> but don’t apply to the embedded
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environment. <code>isatty()</code> is self explanatory. <code>kill()</code> doesn’t
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apply either in an environment withno process control, so it justs
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exits, which is a similar enough behavior. <code>getpid()</code> can safely
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return any value greater than 1. The value doesn’t effect anything in
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<code>newlib</code> because once again there is no process control.
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</p>
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<div class="smallexample">
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<pre class="smallexample">/*
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* isatty -- returns 1 if connected to a terminal device,
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* returns 0 if not. Since we're hooked up to a
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* serial port, we'll say yes and return a 1.
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*/
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int
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isatty(fd)
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int fd;
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{
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return (1);
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}
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/*
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* getpid -- only one process, so just return 1.
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*/
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#define __MYPID 1
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int
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getpid()
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{
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return __MYPID;
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}
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/*
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* kill -- go out via exit...
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*/
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int
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kill(pid, sig)
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int pid;
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int sig;
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{
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if(pid == __MYPID)
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_exit(sig);
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return 0;
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}
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</pre></div>
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