man/man3/Panic.3 - toolchains/skids - Git at Google

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 '\" See the file "license.terms" for information on usage and redistribution
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 '\" RCS: @(#) $Id: Panic.3,v 1.3 2003/01/21 19:39:59 hunt Exp $
 '\"
 '\" The definitions below are for supplemental macros used in Tcl/Tk
 '\" manual entries.
 '\"
 '\" .AP type name in/out ?indent?
 '\"	Start paragraph describing an argument to a library procedure.
 '\"	type is type of argument (int, etc.), in/out is either "in", "out",
 '\"	or "in/out" to describe whether procedure reads or modifies arg,
 '\"	and indent is equivalent to second arg of .IP (shouldn't ever be
 '\"	needed;  use .AS below instead)
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 '\" .AS ?type? ?name?
 '\"	Give maximum sizes of arguments for setting tab stops.  Type and
 '\"	name are examples of largest possible arguments that will be passed
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 '\"	End of list of standard options for a Tk widget.
 '\"
 '\" .OP cmdName dbName dbClass
 '\"	Start of description of a specific option.  cmdName gives the
 '\"	option's name as specified in the class command, dbName gives
 '\"	the option's name in the option database, and dbClass gives
 '\"	the option's class in the option database.
 '\"
 '\" .UL arg1 arg2
 '\"	Print arg1 underlined, then print arg2 normally.
 '\"
 '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
 '\"
 '\"	# Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
 .if t .wh -1.3i ^B
 .nr ^l \n(.l
 .ad b
 '\"	# Start an argument description
 .de AP
 .ie !"\\$4"" .TP \\$4
 .el \{\
 .   ie !"\\$2"" .TP \\n()Cu
 .   el          .TP 15
 .\}
 .ta \\n()Au \\n()Bu
 .ie !"\\$3"" \{\
 \&\\$1	\\fI\\$2\\fP	(\\$3)
 .\".b
 .\}
 .el \{\
 .br
 .ie !"\\$2"" \{\
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 \&\\fI\\$1\\fP
 .\}
 .\}
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 .nr )C \\n()Bu+\\w'(in/out)'u+2n
 ..
 .AS Tcl_Interp Tcl_CreateInterp in/out
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 .\}
 .el \}\
 \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
 .\}
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 .\}
 .if \\n(^v \{\
 .nr ^x \\n(^tu+1v-\\n(^Yu
 \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c
 .\}
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 .ta 5.5c 11c
 .ft B
 ..
 '\"	# SE - end of list of standard options
 .de SE
 .fi
 .ft R
 .LP
 See the \\fBoptions\\fR manual entry for details on the standard options.
 ..
 '\"	# OP - start of full description for a single option
 .de OP
 .LP
 .nf
 .ta 4c
 Command-Line Name:	\\fB\\$1\\fR
 Database Name:	\\fB\\$2\\fR
 Database Class:	\\fB\\$3\\fR
 .fi
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 \\$1\l'|0\(ul'\\$2
 ..
 .TH Tcl_Panic 3 8.4 Tcl "Tcl Library Procedures"
 .BS
 '\"  Note:  do not modify the .SH NAME line immediately below!
 .SH NAME
 Tcl_Panic, Tcl_PanicVA, Tcl_SetPanicProc, panic, panicVA \- report fatal error and abort
 .SH SYNOPSIS
 .nf
 \fB#include <tcl.h>\fR
 .sp
 void
 \fBTcl_Panic\fR(\fIformat\fR, \fIarg\fR, \fIarg\fR, \fI...\fR)
 .sp
 void
 \fBTcl_PanicVA\fR(\fIformat\fR, \fIargList\fR)
 .sp
 void
 \fBTcl_SetPanicProc\fR(\fIpanicProc\fR)
 .sp
 void
 \fBpanic\fR(\fIformat\fR, \fIarg\fR, \fIarg\fR, \fI...\fR)
 .sp
 void
 \fBpanicVA\fR(\fIformat\fR, \fIargList\fR)
 .sp
 .SH ARGUMENTS
 .AS Tcl_PanicProc *panicProc
 .AP "CONST char*" format in
 A printf-style format string.
 .AP "" arg in
 Arguments matching the format string.
 .AP va_list argList in
 An argument list of arguments matching the format string.
 Must have been initialized using \fBTCL_VARARGS_START\fR,
 and cleared using \fBva_end\fR.
 .AP Tcl_PanicProc *panicProc in
 Procedure to report fatal error message and abort.

 .BE

 .SH DESCRIPTION
 .PP
 When the Tcl library detects that its internal data structures are in an
 inconsistent state, or that its C procedures have been called in a
 manner inconsistent with their documentation, it calls \fBTcl_Panic\fR
 to display a message describing the error and abort the process.  The
 \fIformat\fR argument is a format string describing how to format the
 remaining arguments \fIarg\fR into an error message, according to the
 same formatting rules used by the \fBprintf\fR family of functions.  The
 same formatting rules are also used by the builtin Tcl command
 \fBformat\fR.
 .PP
 In a freshly loaded Tcl library, \fBTcl_Panic\fR prints the formatted
 error message to the standard error file of the process, and then
 calls \fBabort\fR to terminate the process.  \fBTcl_Panic\fR does not
 return.
 .PP
 \fBTcl_SetPanicProc\fR may be used to modify the behavior of
 \fBTcl_Panic\fR.  The \fIpanicProc\fR argument should match the
 type \fBTcl_PanicProc\fR:
 .PP
 .CS
 typedef void Tcl_PanicProc(
 	CONST char *\fBformat\fR,
 	\fBarg\fR, \fBarg\fR,...);
 .CE
 .PP
 After \fBTcl_SetPanicProc\fR returns, any future calls to
 \fBTcl_Panic\fR will call \fIpanicProc\fR, passing along the
 \fIformat\fR and \fIarg\fR arguments.  To maintain consistency with the
 callers of \fBTcl_Panic\fR, \fIpanicProc\fR must not return; it must
 call \fBabort\fR.  \fIpanicProc\fR should avoid making calls into the
 Tcl library, or into other libraries that may call the Tcl library,
 since the original call to \fBTcl_Panic\fR indicates the Tcl library is
 not in a state of reliable operation.
 .PP
 The typical use of \fBTcl_SetPanicProc\fR arranges for the error message
 to be displayed or reported in a manner more suitable for the
 application or the platform.  As an example, the Windows implementation
 of \fBwish\fR calls \fBTcl_SetPanicProc\fR to force all panic messages
 to be displayed in a system dialog box, rather than to be printed to the
 standard error file (usually not visible under Windows).
 .PP
 Although the primary callers of \fBTcl_Panic\fR are the procedures of
 the Tcl library, \fBTcl_Panic\fR is a public function and may be called
 by any extension or application that wishes to abort the process and
 have a panic message displayed the same way that panic messages from Tcl
 will be displayed.
 .PP
 \fBTcl_PanicVA\fR is the same as \fBTcl_Panic\fR except that instead of
 taking a variable number of arguments it takes an argument list.  The
 procedures \fBpanic\fR and \fBpanicVA\fR are synonyms (implemented as
 macros) for \fBTcl_Panic\fR and \fBTcl_PanicVA\fR, respectively.  They
 exist to support old code; new code should use direct calls to
 \fBTcl_Panic\fR or \fBTcl_PanicVA\fR.

 .SH "SEE ALSO"
 abort(3), printf(3), exec(n), format(n)

 .SH KEYWORDS
 abort, fatal, error
	'\"
	'\" See the file "license.terms" for information on usage and redistribution
	'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
	'\"
	'\" RCS: @(#) $Id: Panic.3,v 1.3 2003/01/21 19:39:59 hunt Exp $
	'\"
	'\" The definitions below are for supplemental macros used in Tcl/Tk
	'\" manual entries.
	'\"
	'\" .AP type name in/out ?indent?
	'\" Start paragraph describing an argument to a library procedure.
	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	'\" or "in/out" to describe whether procedure reads or modifies arg,
	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	'\" needed; use .AS below instead)
	'\"
	'\" .AS ?type? ?name?
	'\" Give maximum sizes of arguments for setting tab stops. Type and
	'\" name are examples of largest possible arguments that will be passed
	'\" to .AP later. If args are omitted, default tab stops are used.
	'\"
	'\" .BS
	'\" Start box enclosure. From here until next .BE, everything will be
	'\" enclosed in one large box.
	'\"
	'\" .BE
	'\" End of box enclosure.
	'\"
	'\" .CS
	'\" Begin code excerpt.
	'\"
	'\" .CE
	'\" End code excerpt.
	'\"
	'\" .VS ?version? ?br?
	'\" Begin vertical sidebar, for use in marking newly-changed parts
	'\" of man pages. The first argument is ignored and used for recording
	'\" the version when the .VS was added, so that the sidebars can be
	'\" found and removed when they reach a certain age. If another argument
	'\" is present, then a line break is forced before starting the sidebar.
	'\"
	'\" .VE
	'\" End of vertical sidebar.
	'\"
	'\" .DS
	'\" Begin an indented unfilled display.
	'\"
	'\" .DE
	'\" End of indented unfilled display.
	'\"
	'\" .SO
	'\" Start of list of standard options for a Tk widget. The
	'\" options follow on successive lines, in four columns separated
	'\" by tabs.
	'\"
	'\" .SE
	'\" End of list of standard options for a Tk widget.
	'\"
	'\" .OP cmdName dbName dbClass
	'\" Start of description of a specific option. cmdName gives the
	'\" option's name as specified in the class command, dbName gives
	'\" the option's name in the option database, and dbClass gives
	'\" the option's class in the option database.
	'\"
	'\" .UL arg1 arg2
	'\" Print arg1 underlined, then print arg2 normally.
	'\"
	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
	'\"
	'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
	.if t .wh -1.3i ^B
	.nr ^l \n(.l
	.ad b
	'\" # Start an argument description
	.de AP
	.ie !"\\$4"" .TP \\$4
	.el \{\
	. ie !"\\$2"" .TP \\n()Cu
	. el .TP 15
	.\}
	.ta \\n()Au \\n()Bu
	.ie !"\\$3"" \{\
	\&\\$1 \\fI\\$2\\fP (\\$3)
	.\".b
	.\}
	.el \{\
	.br
	.ie !"\\$2"" \{\
	\&\\$1 \\fI\\$2\\fP
	.\}
	.el \{\
	\&\\fI\\$1\\fP
	.\}
	.\}
	..
	'\" # define tabbing values for .AP
	.de AS
	.nr )A 10n
	.if !"\\$1"" .nr )A \\w'\\$1'u+3n
	.nr )B \\n()Au+15n
	.\"
	.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
	.nr )C \\n()Bu+\\w'(in/out)'u+2n
	..
	.AS Tcl_Interp Tcl_CreateInterp in/out
	'\" # BS - start boxed text
	'\" # ^y = starting y location
	'\" # ^b = 1
	.de BS
	.br
	.mk ^y
	.nr ^b 1u
	.if n .nf
	.if n .ti 0
	.if n \l'\\n(.lu\(ul'
	.if n .fi
	..
	'\" # BE - end boxed text (draw box now)
	.de BE
	.nf
	.ti 0
	.mk ^t
	.ie n \l'\\n(^lu\(ul'
	.el \{\
	.\" Draw four-sided box normally, but don't draw top of
	.\" box if the box started on an earlier page.
	.ie !\\n(^b-1 \{\
	\h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
	.el \}\
	\h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
	.\}
	.fi
	.br
	.nr ^b 0
	..
	'\" # VS - start vertical sidebar
	'\" # ^Y = starting y location
	'\" # ^v = 1 (for troff; for nroff this doesn't matter)
	.de VS
	.if !"\\$2"" .br
	.mk ^Y
	.ie n 'mc \s12\(br\s0
	.el .nr ^v 1u
	..
	'\" # VE - end of vertical sidebar
	.de VE
	.ie n 'mc
	.el \{\
	.ev 2
	.nf
	.ti 0
	.mk ^t
	\h'\|\\n(^lu+3n'\L'\|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-\|\\n(^lu+3n'
	.sp -1
	.fi
	.ev
	.\}
	.nr ^v 0
	..
	'\" # Special macro to handle page bottom: finish off current
	'\" # box/sidebar if in box/sidebar mode, then invoked standard
	'\" # page bottom macro.
	.de ^B
	.ev 2
	'ti 0
	'nf
	.mk ^t
	.if \\n(^b \{\
	.\" Draw three-sided box if this is the box's first page,
	.\" draw two sides but no top otherwise.
	.ie !\\n(^b-1 \h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.el \h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.\}
	.if \\n(^v \{\
	.nr ^x \\n(^tu+1v-\\n(^Yu
	\kx\h'-\\nxu'\h'\|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'\|0u'\c
	.\}
	.bp
	'fi
	.ev
	.if \\n(^b \{\
	.mk ^y
	.nr ^b 2
	.\}
	.if \\n(^v \{\
	.mk ^Y
	.\}
	..
	'\" # DS - begin display
	.de DS
	.RS
	.nf
	.sp
	..
	'\" # DE - end display
	.de DE
	.fi
	.RE
	.sp
	..
	'\" # SO - start of list of standard options
	.de SO
	.SH "STANDARD OPTIONS"
	.LP
	.nf
	.ta 5.5c 11c
	.ft B
	..
	'\" # SE - end of list of standard options
	.de SE
	.fi
	.ft R
	.LP
	See the \\fBoptions\\fR manual entry for details on the standard options.
	..
	'\" # OP - start of full description for a single option
	.de OP
	.LP
	.nf
	.ta 4c
	Command-Line Name: \\fB\\$1\\fR
	Database Name: \\fB\\$2\\fR
	Database Class: \\fB\\$3\\fR
	.fi
	.IP
	..
	'\" # CS - begin code excerpt
	.de CS
	.RS
	.nf
	.ta .25i .5i .75i 1i
	..
	'\" # CE - end code excerpt
	.de CE
	.fi
	.RE
	..
	.de UL
	\\$1\l'\|0\(ul'\\$2
	..
	.TH Tcl_Panic 3 8.4 Tcl "Tcl Library Procedures"
	.BS
	'\" Note: do not modify the .SH NAME line immediately below!
	.SH NAME
	Tcl_Panic, Tcl_PanicVA, Tcl_SetPanicProc, panic, panicVA \- report fatal error and abort
	.SH SYNOPSIS
	.nf
	\fB#include <tcl.h>\fR
	.sp
	void
	\fBTcl_Panic\fR(\fIformat\fR, \fIarg\fR, \fIarg\fR, \fI...\fR)
	.sp
	void
	\fBTcl_PanicVA\fR(\fIformat\fR, \fIargList\fR)
	.sp
	void
	\fBTcl_SetPanicProc\fR(\fIpanicProc\fR)
	.sp
	void
	\fBpanic\fR(\fIformat\fR, \fIarg\fR, \fIarg\fR, \fI...\fR)
	.sp
	void
	\fBpanicVA\fR(\fIformat\fR, \fIargList\fR)
	.sp
	.SH ARGUMENTS
	.AS Tcl_PanicProc *panicProc
	.AP "CONST char*" format in
	A printf-style format string.
	.AP "" arg in
	Arguments matching the format string.
	.AP va_list argList in
	An argument list of arguments matching the format string.
	Must have been initialized using \fBTCL_VARARGS_START\fR,
	and cleared using \fBva_end\fR.
	.AP Tcl_PanicProc *panicProc in
	Procedure to report fatal error message and abort.

	.BE

	.SH DESCRIPTION
	.PP
	When the Tcl library detects that its internal data structures are in an
	inconsistent state, or that its C procedures have been called in a
	manner inconsistent with their documentation, it calls \fBTcl_Panic\fR
	to display a message describing the error and abort the process. The
	\fIformat\fR argument is a format string describing how to format the
	remaining arguments \fIarg\fR into an error message, according to the
	same formatting rules used by the \fBprintf\fR family of functions. The
	same formatting rules are also used by the builtin Tcl command
	\fBformat\fR.
	.PP
	In a freshly loaded Tcl library, \fBTcl_Panic\fR prints the formatted
	error message to the standard error file of the process, and then
	calls \fBabort\fR to terminate the process. \fBTcl_Panic\fR does not
	return.
	.PP
	\fBTcl_SetPanicProc\fR may be used to modify the behavior of
	\fBTcl_Panic\fR. The \fIpanicProc\fR argument should match the
	type \fBTcl_PanicProc\fR:
	.PP
	.CS
	typedef void Tcl_PanicProc(
	CONST char *\fBformat\fR,
	\fBarg\fR, \fBarg\fR,...);
	.CE
	.PP
	After \fBTcl_SetPanicProc\fR returns, any future calls to
	\fBTcl_Panic\fR will call \fIpanicProc\fR, passing along the
	\fIformat\fR and \fIarg\fR arguments. To maintain consistency with the
	callers of \fBTcl_Panic\fR, \fIpanicProc\fR must not return; it must
	call \fBabort\fR. \fIpanicProc\fR should avoid making calls into the
	Tcl library, or into other libraries that may call the Tcl library,
	since the original call to \fBTcl_Panic\fR indicates the Tcl library is
	not in a state of reliable operation.
	.PP
	The typical use of \fBTcl_SetPanicProc\fR arranges for the error message
	to be displayed or reported in a manner more suitable for the
	application or the platform. As an example, the Windows implementation
	of \fBwish\fR calls \fBTcl_SetPanicProc\fR to force all panic messages
	to be displayed in a system dialog box, rather than to be printed to the
	standard error file (usually not visible under Windows).
	.PP
	Although the primary callers of \fBTcl_Panic\fR are the procedures of
	the Tcl library, \fBTcl_Panic\fR is a public function and may be called
	by any extension or application that wishes to abort the process and
	have a panic message displayed the same way that panic messages from Tcl
	will be displayed.
	.PP
	\fBTcl_PanicVA\fR is the same as \fBTcl_Panic\fR except that instead of
	taking a variable number of arguments it takes an argument list. The
	procedures \fBpanic\fR and \fBpanicVA\fR are synonyms (implemented as
	macros) for \fBTcl_Panic\fR and \fBTcl_PanicVA\fR, respectively. They
	exist to support old code; new code should use direct calls to
	\fBTcl_Panic\fR or \fBTcl_PanicVA\fR.

	.SH "SEE ALSO"
	abort(3), printf(3), exec(n), format(n)

	.SH KEYWORDS
	abort, fatal, error