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<title>The Red Hat newlib C Library: Syscalls</title>
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Next: <a href="Arglists.html#Arglists" accesskey="n" rel="next">Arglists</a>, Previous: <a href="Misc.html#Misc" accesskey="p" rel="prev">Misc</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<a name="System-Calls"></a>
<h2 class="chapter">12 System Calls</h2>
<a name="index-linking-the-C-library"></a>
<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—in
the extreme case, if you are developing software for a “bare board”
system, without an OS—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>.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">• <a href="Stubs.html#Stubs" accesskey="1">Stubs</a>:</td><td> </td><td align="left" valign="top">Definitions for OS interface
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<tr><td align="left" valign="top">• <a href="Reentrant-Syscalls.html#Reentrant-Syscalls" accesskey="2">Reentrant Syscalls</a>:</td><td> </td><td align="left" valign="top">Reentrant covers for OS subroutines
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