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96 lines
3.8 KiB
HTML
96 lines
3.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>FreeBSD (Debugging with GDB)</title>
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<meta name="description" content="FreeBSD (Debugging with GDB)">
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<meta name="keywords" content="FreeBSD (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Native.html#Native" rel="up" title="Native">
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<link href="Embedded-OS.html#Embedded-OS" rel="next" title="Embedded OS">
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<link href="Darwin.html#Darwin" rel="prev" title="Darwin">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="FreeBSD"></a>
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<div class="header">
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<p>
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Previous: <a href="Darwin.html#Darwin" accesskey="p" rel="prev">Darwin</a>, Up: <a href="Native.html#Native" accesskey="u" rel="up">Native</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="FreeBSD-1"></a>
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<h4 class="subsection">21.1.7 FreeBSD</h4>
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<a name="index-FreeBSD"></a>
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<p>When the ABI of a system call is changed in the FreeBSD kernel, this
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is implemented by leaving a compatibility system call using the old
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ABI at the existing number and allocating a new system call number for
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the version using the new ABI. As a convenience, when a system call
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is caught by name (see <a href="Set-Catchpoints.html#catch-syscall">catch syscall</a>), compatibility system calls
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are also caught.
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</p>
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<p>For example, FreeBSD 12 introduced a new variant of the <code>kevent</code>
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system call and catching the <code>kevent</code> system call by name catches
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both variants:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) catch syscall kevent
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Catchpoint 1 (syscalls 'freebsd11_kevent' [363] 'kevent' [560])
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(gdb)
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</pre></div>
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</body>
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</html>
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