67 lines
2.7 KiB
HTML
67 lines
2.7 KiB
HTML
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<html lang="en">
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<head>
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<title>FreeBSD - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Native.html#Native" title="Native">
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<link rel="prev" href="Darwin.html#Darwin" title="Darwin">
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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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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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<div class="node">
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<a name="FreeBSD"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Darwin.html#Darwin">Darwin</a>,
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Up: <a rel="up" accesskey="u" href="Native.html#Native">Native</a>
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<hr>
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</div>
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<h4 class="subsection">21.1.7 FreeBSD</h4>
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<p><a name="index-FreeBSD-1566"></a>
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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="catch-syscall.html#catch-syscall">catch syscall</a>), compatibility system calls
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are also caught.
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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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<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>
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</body></html>
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