freebsd-nq/lib/libsysdecode/sysdecode_kevent.3
John Baldwin ffb6607984 Decode kevent structures logged via ktrace(2) in kdump.
- 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
2017-11-25 04:49:12 +00:00

127 lines
3.3 KiB
Groff

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.Dd November 24, 2017
.Dt sysdecode_kevent 3
.Os
.Sh NAME
.Nm sysdecode_kevent ,
.Nm sysdecode_kevent_fflags ,
.Nm sysdecode_kevent_filter ,
.Nm sysdecode_kevent_flags
.Nd output description of kevent structure fields
.Sh LIBRARY
.Lb libsysdecode
.Sh SYNOPSIS
.In sys/types.h
.In stdbool.h
.In stdio.h
.In sysdecode.h
.Ft void
.Fn sysdecode_kevent_fflags "FILE *fp" "short filter" "int fflags" "int base"
.Ft bool
.Fn sysdecode_kevent_flags "FILE *fp" "int flags" "int *rem"
.Ft const char *
.Fn sysdecode_kevent_filter "int filter"
.Sh DESCRIPTION
These functions provide text descriptions of
.Vt struct kevent
fields.
.Pp
The
.Fn sysdecode_kevent_fflags
function outputs a text description of the
.Fa fflags
member of a
.Vt struct kevent
to the stream
.Fa fp .
For the
.Dv EVFILT_READ ,
.Dv EVFILT_WRITE ,
.Dv EVFILT_VNODE ,
.Dv EVFILT_PROC ,
.Dv EVFILT_PROCDESC ,
.Dv EVFILT_TIMER ,
and
.Dv EVFILT_USER
filters,
.Fn sysdecode_kevent_fflags
outputs a bitmask of filter-specific
.Dv NOTE_*
flags as documented in
.Xr kevent 2 .
For other values of
.Fa filter ,
the value of
.Fa fflags
is output in the indicated
.Fa base
.Pq one of 8, 10, or 16 .
.Pp
The
.Fn sysdecode_kevent_filter
function returns a text description of the
.Fa filter
member of a
.Vt struct kevent .
.Dv NULL
is returned if the
.Fa filter
value is unknown.
.Pp
The
.Fn sysdecode_kevent_flags
function outputs a text description of the
.Fa flags
member of a
.Vt struct kevent
to the stream
.Fa fp .
This function uses the same calling convention and formatting as the other
functions described in
.Xr sysdecode_mask 3 .
.Sh RETURN VALUES
The
.Nm sysdecode_kevent_filter
function returns the name of a filter or
.Dv NULL if the filter value is unknown.
.Pp
The
.Nm sysdecode_kevent_flags
function returns
.Dv true
if any flags in the
.Fa flags
field were decoded and
.Dv false
if no flags were decoded.
.Sh SEE ALSO
.Xr sysdecode 3 ,
.Xr sysdecode_enum 3 ,
.Xr sysdecode_mask 3