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Diffstat (limited to 'gdb/doc/gdb.texinfo')
| -rw-r--r-- | gdb/doc/gdb.texinfo | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 7350d94..d766e44 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -4560,6 +4560,7 @@ A failed Ada assertion. @cindex break on fork/exec A call to @code{exec}. +@anchor{catch syscall} @item syscall @itemx syscall @r{[}@var{name} @r{|} @var{number} @r{|} @r{group:}@var{groupname} @r{|} @r{g:}@var{groupname}@r{]} @dots{} @kindex catch syscall @@ -22357,6 +22358,7 @@ configurations. * Cygwin Native:: Features specific to the Cygwin port * Hurd Native:: Features specific to @sc{gnu} Hurd * Darwin:: Features specific to Darwin +* FreeBSD:: Features specific to FreeBSD @end menu @node BSD libkvm Interface @@ -23242,6 +23244,27 @@ better understand the cause of a fault. The default is off. Show the current state of exceptions trapping. @end table +@node FreeBSD +@subsection FreeBSD +@cindex FreeBSD + +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 (@pxref{catch syscall}), compatibility system calls +are also caught. + +For example, FreeBSD 12 introduced a new variant of the @code{kevent} +system call and catching the @code{kevent} system call by name catches +both variants: + +@smallexample +(@value{GDBP}) catch syscall kevent +Catchpoint 1 (syscalls 'freebsd11_kevent' [363] 'kevent' [560]) +(@value{GDBP}) +@end smallexample + @node Embedded OS @section Embedded Operating Systems |