ffb6607984
- Add a new KTR_STRUCT_ARRAY ktrace record type which dumps an array of structures. The structure name in the record payload is preceded by a size_t containing the size of the individual structures. Use this to replace the previous code that dumped the kevent arrays dumped for kevent(). kdump is now able to decode the kevent structures rather than dumping their contents via a hexdump. One change from before is that the 'changes' and 'events' arrays are not marked with separate 'read' and 'write' annotations in kdump output. Instead, the first array is the 'changes' array, and the second array (only present if kevent doesn't fail with an error) is the 'events' array. For kevent(), empty arrays are denoted by an entry with an array containing zero entries rather than no record. - Move kevent decoding tables from truss to libsysdecode. This adds three new functions to decode members of struct kevent: sysdecode_kevent_filter, sysdecode_kevent_flags, and sysdecode_kevent_fflags. kdump uses these helper functions to pretty-print kevent fields. - Move structure definitions for freebsd11 and freebsd32 kevent structures to <sys/event.h> so that they can be shared with userland. The 32-bit structures are only exposed if _WANT_KEVENT32 is defined. The freebsd11 structures are only exposed if _WANT_FREEBSD11_KEVENT is defined. The 32-bit freebsd11 structure requires both. - Decode freebsd11 kevent structures in truss for the compat11.kevent() system call. - Log 32-bit kevent structures via ktrace for 32-bit compat kevent() system calls. - While here, constify the 'void *data' argument to ktrstruct(). Reviewed by: kib (earlier version) MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D12470
127 lines
3.3 KiB
Groff
127 lines
3.3 KiB
Groff
.\"
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.\" Copyright (c) 2017 John Baldwin <jhb@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 24, 2017
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.Dt sysdecode_kevent 3
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.Os
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.Sh NAME
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.Nm sysdecode_kevent ,
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.Nm sysdecode_kevent_fflags ,
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.Nm sysdecode_kevent_filter ,
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.Nm sysdecode_kevent_flags
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.Nd output description of kevent structure fields
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.Sh LIBRARY
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.Lb libsysdecode
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.Sh SYNOPSIS
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.In sys/types.h
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.In stdbool.h
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.In stdio.h
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.In sysdecode.h
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.Ft void
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.Fn sysdecode_kevent_fflags "FILE *fp" "short filter" "int fflags" "int base"
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.Ft bool
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.Fn sysdecode_kevent_flags "FILE *fp" "int flags" "int *rem"
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.Ft const char *
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.Fn sysdecode_kevent_filter "int filter"
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.Sh DESCRIPTION
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These functions provide text descriptions of
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.Vt struct kevent
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fields.
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.Pp
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The
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.Fn sysdecode_kevent_fflags
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function outputs a text description of the
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.Fa fflags
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member of a
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.Vt struct kevent
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to the stream
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.Fa fp .
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For the
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.Dv EVFILT_READ ,
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.Dv EVFILT_WRITE ,
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.Dv EVFILT_VNODE ,
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.Dv EVFILT_PROC ,
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.Dv EVFILT_PROCDESC ,
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.Dv EVFILT_TIMER ,
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and
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.Dv EVFILT_USER
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filters,
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.Fn sysdecode_kevent_fflags
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outputs a bitmask of filter-specific
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.Dv NOTE_*
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flags as documented in
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.Xr kevent 2 .
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For other values of
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.Fa filter ,
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the value of
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.Fa fflags
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is output in the indicated
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.Fa base
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.Pq one of 8, 10, or 16 .
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.Pp
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The
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.Fn sysdecode_kevent_filter
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function returns a text description of the
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.Fa filter
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member of a
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.Vt struct kevent .
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.Dv NULL
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is returned if the
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.Fa filter
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value is unknown.
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.Pp
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The
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.Fn sysdecode_kevent_flags
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function outputs a text description of the
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.Fa flags
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member of a
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.Vt struct kevent
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to the stream
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.Fa fp .
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This function uses the same calling convention and formatting as the other
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functions described in
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.Xr sysdecode_mask 3 .
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.Sh RETURN VALUES
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The
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.Nm sysdecode_kevent_filter
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function returns the name of a filter or
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.Dv NULL if the filter value is unknown.
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.Pp
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The
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.Nm sysdecode_kevent_flags
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function returns
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.Dv true
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if any flags in the
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.Fa flags
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field were decoded and
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.Dv false
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if no flags were decoded.
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.Sh SEE ALSO
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.Xr sysdecode 3 ,
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.Xr sysdecode_enum 3 ,
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.Xr sysdecode_mask 3
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