Move mksubr from kdump into libsysdecode.
Restructure this script so that it generates a header of tables instead
of a source file. The tables are included in a flags.c source file which
provides functions to decode various system call arguments.
For functions that decode an enumeration, the function returns a pointer
to a string for known values and NULL for unknown values.
For functions that do more complex decoding (typically of a bitmask), the
function accepts a pointer to a FILE object (open_memstream() can be used
as a string builder) to which decoded values are written. If the
function operates on a bitmask, the function returns true if any bits
were decoded or false if the entire value was valid. Additionally, the
third argument accepts a pointer to a value to which any undecoded bits
are stored. This pointer can be NULL if the caller doesn't care about
remaining bits.
Convert kdump over to using decoder functions from libsysdecode instead of
mksubr. truss also uses decoders from libsysdecode instead of private
lookup tables, though lookup tables for objects not decoded by kdump remain
in truss for now. Eventually most of these tables should move into
libsysdecode as the automated table generation approach from mksubr is
less stale than the static tables in truss.
Some changes have been made to truss and kdump output:
- The flags passed to open() are now properly decoded in that one of
O_RDONLY, O_RDWR, O_WRONLY, or O_EXEC is always included in a decoded
mask.
- Optional arguments to open(), openat(), and fcntl() are only printed
in kdump if they exist (e.g. the mode is only printed for open() if
O_CREAT is set in the flags).
- Print argument to F_GETLK/SETLK/SETLKW in kdump as a pointer, not int.
- Include all procctl() commands.
- Correctly decode pipe2() flags in truss by not assuming full
open()-like flags with O_RDONLY, etc.
- Decode file flags passed to *chflags() as file flags (UF_* and SF_*)
rather than as a file mode.
- Fix decoding of quotactl() commands by splitting out the two command
components instead of assuming the raw command value matches the
primary command component.
In addition, truss and kdump now build without triggering any warnings.
All of the sysdecode manpages now include the required headers in the
synopsis.
Reviewed by: kib (several older versions), wblock (manpages)
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D7847
2016-10-17 22:37:07 +00:00
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.\"
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.\" Copyright (c) 2016 John Baldwin <jhb@FreeBSD.org>
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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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2017-11-25 03:59:36 +00:00
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.Dd November 24, 2017
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Move mksubr from kdump into libsysdecode.
Restructure this script so that it generates a header of tables instead
of a source file. The tables are included in a flags.c source file which
provides functions to decode various system call arguments.
For functions that decode an enumeration, the function returns a pointer
to a string for known values and NULL for unknown values.
For functions that do more complex decoding (typically of a bitmask), the
function accepts a pointer to a FILE object (open_memstream() can be used
as a string builder) to which decoded values are written. If the
function operates on a bitmask, the function returns true if any bits
were decoded or false if the entire value was valid. Additionally, the
third argument accepts a pointer to a value to which any undecoded bits
are stored. This pointer can be NULL if the caller doesn't care about
remaining bits.
Convert kdump over to using decoder functions from libsysdecode instead of
mksubr. truss also uses decoders from libsysdecode instead of private
lookup tables, though lookup tables for objects not decoded by kdump remain
in truss for now. Eventually most of these tables should move into
libsysdecode as the automated table generation approach from mksubr is
less stale than the static tables in truss.
Some changes have been made to truss and kdump output:
- The flags passed to open() are now properly decoded in that one of
O_RDONLY, O_RDWR, O_WRONLY, or O_EXEC is always included in a decoded
mask.
- Optional arguments to open(), openat(), and fcntl() are only printed
in kdump if they exist (e.g. the mode is only printed for open() if
O_CREAT is set in the flags).
- Print argument to F_GETLK/SETLK/SETLKW in kdump as a pointer, not int.
- Include all procctl() commands.
- Correctly decode pipe2() flags in truss by not assuming full
open()-like flags with O_RDONLY, etc.
- Decode file flags passed to *chflags() as file flags (UF_* and SF_*)
rather than as a file mode.
- Fix decoding of quotactl() commands by splitting out the two command
components instead of assuming the raw command value matches the
primary command component.
In addition, truss and kdump now build without triggering any warnings.
All of the sysdecode manpages now include the required headers in the
synopsis.
Reviewed by: kib (several older versions), wblock (manpages)
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D7847
2016-10-17 22:37:07 +00:00
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.Dt sysdecode_fcntl_arg 3
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.Os
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.Sh NAME
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.Nm sysdecode_fcntl_arg ,
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.Nm sysdecode_fcntl_arg_p
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.Nd output description of fcntl argument
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.Sh LIBRARY
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.Lb libsysdecode
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.Sh SYNOPSIS
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.In sysdecode.h
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.Ft void
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.Fn sysdecode_fcntl_arg "FILE *fp" "int cmd" "uintptr_t arg" "int base"
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.Ft bool
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.Fn sysdecode_fcntl_arg_p "int cmd"
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.Sh DESCRIPTION
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The
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.Fn sysdecode_fcntl_arg
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function outputs a text description of the optional
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.Fa arg
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argument to
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.Xr fcntl 2
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to the stream
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.Fa fp .
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The type and format of
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.Fa arg
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are determined by
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.Fa cmd :
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.Bl -column ".Dv F_SETLKW" "Vt struct flock *"
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.It Sy Command Ta Fa arg Sy Type Ta Sy Output Format
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.It
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.It Dv F_SETFD Ta Vt int Ta
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.Dq FD_CLOEXEC
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or the value of
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.Fa arg
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in the indicated
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.Fa base
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.Pq one of 8, 10, or 16 .
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.It
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.It Dv F_SETFL Ta Vt int Ta
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File flags as output by
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.Xr sysdecode_fcntl_fileflags 3
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with any unknown or remaining bits output in hexadecimal.
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.It
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.It Dv F_GETLK Ta Vt struct flock * Ta
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.It Dv F_SETLK Ta Vt struct flock * Ta
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.It Dv F_SETLKW Ta Vt struct flock * Ta
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The value of
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.Fa arg
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using the
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.Dq %p
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conversion specification.
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.It
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.It Others Ta Vt int Ta
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The value of
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.Fa arg
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in the indicated
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.Fa base
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.Pq one of 8, 10, or 16 .
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.El
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.Pp
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The
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.Fn sysdecode_fcntl_arg_p
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function can be used to determine if a
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.Xr fcntl 2
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command uses the optional third argument to
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.Xr fcntl 2 .
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The function returns
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.Dv true
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if
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.Fa cmd
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accepts a third argument to
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.Xr fcntl 2
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and
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.Dv false
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if it does not.
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.Sh RETURN VALUES
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The
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.Nm sysdecode_fcntl_arg_p
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function returns
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.Dv true
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if
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.Fa cmd
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accepts a third argument to
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.Xr fcntl 2
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and
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.Dv false
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if it does not.
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.Sh SEE ALSO
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.Xr sysdecode 3 ,
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.Xr sysdecode_fcntl_cmd 3 ,
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.Xr sysdecode_fcntl_fileflags 3
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