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

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 '\" Copyright (c) 1996 Sun Microsystems, Inc.
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 '\" RCS: @(#) $Id: SetErrno.3,v 1.5 2002/01/15 21:47:27 dgp Exp $
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 .TH Tcl_SetErrno 3 8.3 Tcl "Tcl Library Procedures"
 .BS
 .SH NAME
 Tcl_SetErrno, Tcl_GetErrno, Tcl_ErrnoId, Tcl_ErrnoMsg \- manipulate errno to store and retrieve error codes
 .SH SYNOPSIS
 .nf
 \fB#include <tcl.h>\fR
 .sp
 void
 \fBTcl_SetErrno\fR(\fIerrorCode\fR)
 .sp
 int
 \fBTcl_GetErrno\fR()
 .sp
 CONST char *
 \fBTcl_ErrnoId\fR()
 .sp
 CONST char *
 \fBTcl_ErrnoMsg\fR(\fIerrorCode\fR)
 .sp
 .SH ARGUMENTS
 .AS int errorCode in
 .AP int errorCode in
 A POSIX error code such as \fBENOENT\fR.
 .BE

 .SH DESCRIPTION
 .PP
 \fBTcl_SetErrno\fR and \fBTcl_GetErrno\fR provide portable access
 to the \fBerrno\fR variable, which is used to record a POSIX error
 code after system calls and other operations such as \fBTcl_Gets\fR.
 These procedures are necessary because global variable accesses cannot
 be made across module boundaries on some platforms.
 .PP
 \fBTcl_SetErrno\fR sets the \fBerrno\fR variable to the value of the
 \fIerrorCode\fR argument
 C procedures that wish to return error information to their callers
 via \fBerrno\fR should call \fBTcl_SetErrno\fR rather than setting
 \fBerrno\fR directly.
 .PP
 \fBTcl_GetErrno\fR returns the current value of \fBerrno\fR.
 Procedures wishing to access \fBerrno\fR should call this procedure
 instead of accessing \fBerrno\fR directly.
 .PP
 \fBTcl_ErrnoId\fR and \fBTcl_ErrnoMsg\fR return string
 representations of \fBerrno\fR values.  \fBTcl_ErrnoId\fR
 returns a machine-readable textual identifier such as
 "EACCES" that corresponds to the current value of \fBerrno\fR.
 \fBTcl_ErrnoMsg\fR returns a human-readable string such as
 "permission denied" that corresponds to the value of its
 \fIerrorCode\fR argument.  The \fIerrorCode\fR argument is
 typically the value returned by \fBTcl_GetErrno\fR.
 The strings returned by these functions are
 statically allocated and the caller must not free or modify them.

 .SH KEYWORDS
 errno, error code, global variables
	'\"
	'\" Copyright (c) 1996 Sun Microsystems, Inc.
	'\"
	'\" See the file "license.terms" for information on usage and redistribution
	'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
	'\"
	'\" RCS: @(#) $Id: SetErrno.3,v 1.5 2002/01/15 21:47:27 dgp 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
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	'\" enclosed in one large box.
	'\"
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	'\" End of vertical sidebar.
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	'\" .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
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	.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
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	.LP
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	..
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	.LP
	See the \\fBoptions\\fR manual entry for details on the standard options.
	..
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	.de OP
	.LP
	.nf
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	Command-Line Name: \\fB\\$1\\fR
	Database Name: \\fB\\$2\\fR
	Database Class: \\fB\\$3\\fR
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	.de UL
	\\$1\l'\|0\(ul'\\$2
	..
	.TH Tcl_SetErrno 3 8.3 Tcl "Tcl Library Procedures"
	.BS
	.SH NAME
	Tcl_SetErrno, Tcl_GetErrno, Tcl_ErrnoId, Tcl_ErrnoMsg \- manipulate errno to store and retrieve error codes
	.SH SYNOPSIS
	.nf
	\fB#include <tcl.h>\fR
	.sp
	void
	\fBTcl_SetErrno\fR(\fIerrorCode\fR)
	.sp
	int
	\fBTcl_GetErrno\fR()
	.sp
	CONST char *
	\fBTcl_ErrnoId\fR()
	.sp
	CONST char *
	\fBTcl_ErrnoMsg\fR(\fIerrorCode\fR)
	.sp
	.SH ARGUMENTS
	.AS int errorCode in
	.AP int errorCode in
	A POSIX error code such as \fBENOENT\fR.
	.BE

	.SH DESCRIPTION
	.PP
	\fBTcl_SetErrno\fR and \fBTcl_GetErrno\fR provide portable access
	to the \fBerrno\fR variable, which is used to record a POSIX error
	code after system calls and other operations such as \fBTcl_Gets\fR.
	These procedures are necessary because global variable accesses cannot
	be made across module boundaries on some platforms.
	.PP
	\fBTcl_SetErrno\fR sets the \fBerrno\fR variable to the value of the
	\fIerrorCode\fR argument
	C procedures that wish to return error information to their callers
	via \fBerrno\fR should call \fBTcl_SetErrno\fR rather than setting
	\fBerrno\fR directly.
	.PP
	\fBTcl_GetErrno\fR returns the current value of \fBerrno\fR.
	Procedures wishing to access \fBerrno\fR should call this procedure
	instead of accessing \fBerrno\fR directly.
	.PP
	\fBTcl_ErrnoId\fR and \fBTcl_ErrnoMsg\fR return string
	representations of \fBerrno\fR values. \fBTcl_ErrnoId\fR
	returns a machine-readable textual identifier such as
	"EACCES" that corresponds to the current value of \fBerrno\fR.
	\fBTcl_ErrnoMsg\fR returns a human-readable string such as
	"permission denied" that corresponds to the value of its
	\fIerrorCode\fR argument. The \fIerrorCode\fR argument is
	typically the value returned by \fBTcl_GetErrno\fR.
	The strings returned by these functions are
	statically allocated and the caller must not free or modify them.

	.SH KEYWORDS
	errno, error code, global variables