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toolchain-gcc-arm-embedded

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<a name="System-Calls"></a>
<h2 class="chapter">13 System Calls</h2>

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<p>The C subroutine library depends on a handful of subroutine calls for
operating system services.  If you use the C library on a system that
complies with the POSIX.1 standard (also known as IEEE 1003.1), most of
these subroutines are supplied with your operating system.
</p>
<p>If some of these subroutines are not provided with your system&mdash;in
the extreme case, if you are developing software for a &ldquo;bare board&rdquo;
system, without an OS&mdash;you will at least need to provide do-nothing
stubs (or subroutines with minimal functionality) to allow your
programs to link with the subroutines in <code>libc.a</code>.
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<tr><td align="left" valign="top">&bull; <a href="Stubs.html#Stubs" accesskey="1">Stubs</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Definitions for OS interface
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<tr><td align="left" valign="top">&bull; <a href="Reentrant-Syscalls.html#Reentrant-Syscalls" accesskey="2">Reentrant Syscalls</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Reentrant covers for OS subroutines
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