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- <h4 class="subsection">21.1.7 FreeBSD</h4>
- <a name="index-FreeBSD"></a>
-
- <p>When the ABI of a system call is changed in the FreeBSD kernel, this
- is implemented by leaving a compatibility system call using the old
- ABI at the existing number and allocating a new system call number for
- the version using the new ABI. As a convenience, when a system call
- is caught by name (see <a href="Set-Catchpoints.html#catch-syscall">catch syscall</a>), compatibility system calls
- are also caught.
- </p>
- <p>For example, FreeBSD 12 introduced a new variant of the <code>kevent</code>
- system call and catching the <code>kevent</code> system call by name catches
- both variants:
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- <div class="smallexample">
- <pre class="smallexample">(gdb) catch syscall kevent
- Catchpoint 1 (syscalls 'freebsd11_kevent' [363] 'kevent' [560])
- (gdb)
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