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| <h2 class="chapter">12 System Calls</h2> |
| |
| <p><a name="index-linking-the-C-library-461"></a>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>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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| <li><a accesskey="1" href="Stubs.html#Stubs">Stubs</a>: Definitions for OS interface |
| <li><a accesskey="2" href="Reentrant-Syscalls.html#Reentrant-Syscalls">Reentrant Syscalls</a>: Reentrant covers for OS subroutines |
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