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- Next: <a href="Arglists.html#Arglists" accesskey="n" rel="next">Arglists</a>, Previous: <a href="Overflow-Protection.html#Overflow-Protection" accesskey="p" rel="prev">Overflow Protection</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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- <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—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>.
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- <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
- </td></tr>
- <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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