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| <h4 class="subsection">21.1.7 FreeBSD</h4> |
| |
| <p><a name="index-FreeBSD-1566"></a> |
| 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="catch-syscall.html#catch-syscall">catch syscall</a>), compatibility system calls |
| are also caught. |
| |
| <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: |
| |
| <pre class="smallexample"> (gdb) catch syscall kevent |
| Catchpoint 1 (syscalls 'freebsd11_kevent' [363] 'kevent' [560]) |
| (gdb) |
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