minix/lib/libc/gen/fmtmsg.3
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

220 lines
6.2 KiB
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.\" $NetBSD: fmtmsg.3,v 1.6 2008/04/30 13:10:50 martin Exp $
.\"
.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Klaus Klein.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd September 10, 1999
.Dt FMTMSG 3
.Os
.Sh NAME
.Nm fmtmsg
.Nd format and display a message
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In fmtmsg.h
.Ft int
.Fn fmtmsg "long classification" "const char *label" "int severity" "const char *text" "const char *action" "const char *tag"
.Sh DESCRIPTION
The
.Fn fmtmsg
function can be used to display messages in the specified format.
Messages may be written either to standard error, to the console, or both.
.Pp
A formatted message consists of up to five components specified in
.Fa label ,
.Fa severity ,
.Fa text ,
.Fa action
and
.Fa tag .
Further information such as the origin of the message, the recoverability
from the condition causing the message and where to display the message
is specified in
.Fa classification .
.Ss classification
The
.Fa classification
argument consists of a major classification and several sub-classifications.
It has no effect on the content of the message displayed.
With the exception of the display sub-classification, only a single identifier
may be specified for each (sub-)classification.
The following classifications
are available:
.Bl -tag -width MessageXSourceXSub-classificationsXX
.It Major Classifications
The source of the condition.
Available identifiers are:
.Dv MM_HARD
(hardware),
.Dv MM_SOFT
(software), and
.Dv MM_FIRM
(firmware).
.It Message Source Sub-classifications
The type of software detecting the condition.
Available identifiers are:
.Dv MM_APPL
(application),
.Dv MM_UTIL
(utility), and
.Dv MM_OPSYS
(operating system).
.It Display Sub-classifications
The displays the formatted messages is to be written to.
Available identifiers are:
.Dv MM_PRINT
(standard error stream) and
.Dv MM_CONSOLE
(system console).
.It Status Sub-classifications
The capability of the calling software to recover from the condition.
Available identifiers are:
.Dv MM_RECOVER
(recoverable) and
.Dv MM_NRECOV
(non-recoverable).
.El
.Pp
If no
.Fa classification
is to be supplied,
.Dv MM_NULLMC
must be specified.
.Ss label
The
.Fa label
argument identifies the source of the message.
It consists of two fields separated by a colon (:).
The first field is up to 10 characters, the second is up to 14 characters.
.Pp
If no
.Fa label
is to be supplied,
.Dv MM_NULLLBL
must be specified.
.Ss severity
The seriousness of the condition causing the message.
The following
.Fa severity
levels are available:
.Bl -tag -width MM_WARNINGXX
.It Dv MM_HALT
The software has encountered a severe fault and is halting.
.It Dv MM_ERROR
The software has encountered a fault.
.It Dv MM_WARNING
The software has encountered an unusual non-fault condition.
.It Dv MM_INFO
The software informs about a non-error condition.
.El
.Pp
If no
.Fa severity
level is to be supplied,
.Dv MM_NOSEV
must be specified.
.Ss text
The description of the condition the software encountered.
The character
string is not limited to a specific size.
.Pp
If no
.Fa text
is to be supplied,
.Dv MM_NOTXT
must be specified.
.Ss action
The first step to be taken to recover from the condition the software
encountered; it will be preceded by the prefix
.Dq TO FIX: .
The character string is not limited to a specific size.
.Pp
If no
.Fa action
is to be supplied,
.Dv MM_NOACT
must be specified.
.Ss tag
The on-line documentation which provides further information about the
condition and the message, such as
.Dq Xr fmtmsg 3 .
The character string is not limited to a specific size.
.Pp
If no
.Fa tag
is to be supplied,
.Dv MM_NOTAG
must be specified.
.Pp
Further effect on the formatting of the message as displayed on the
standard error stream (but not on the system console!) may be taken by
setting the
.Ev MSGVERB
environment variable, which selects the subset of message components
to be printed.
It consists of a colon-separated list of the optional keywords
.Fa label ,
.Fa severity ,
.Fa text ,
.Fa action ,
and
.Fa tag ,
which correspond to the arguments to
.Fn fmtmsg
with the same names.
If
.Ev MSGVERB
is either not set or malformed (containing empty or unknown keywords),
its content is ignored an all message components will be selected.
.Pp
Note that displaying a message on the system console may fail due to
inappropriate privileges or a non-permissive file mode of the console device.
.Sh RETURN VALUES
The
.Fn fmtmsg
function returns one of the following values:
.Bl -tag -width MM_NOTOKXXX
.It Dv MM_OK
The function succeeded.
.It Dv MM_NOTOK
The function failed completely.
.It Dv MM_NOMSG
The function was unable to generate a message on standard error,
but otherwise succeeded.
.It Dv MM_NOCOM
The function was unable to generate a message on the console,
but otherwise succeeded.
.El
.Sh SEE ALSO
.Xr printf 3 ,
.Xr syslog 3
.Sh STANDARDS
The
.Fn fmtmsg
function conforms to
.St -xsh5 .