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Top Forums Programming A weird problem with POSIX function Post 302556043 by Corona688 on Friday 16th of September 2011 11:42:14 AM
Old 09-16-2011
Code:
(O_RDWR + O_CREATE + O_EXCL)

This is wrong. Sometimes you can get away with adding bitfields, but not always. Imagine these binary numbers:

Code:
  00000001
+ 00000010
=========
  00000011

No overlap, so they act like you expect. If they overlap:

Code:
  00000011
+ 00000010
=========
  00000101

1+1=10, so it carries, enabling a brand-new bit which had nothing to do with anything you meant to enable.

If you want to set bits and nothing but set bits, | is what you want.

Code:
O_RDWR | O_CREATE | O_EXCL

 

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term::ansi::code::attr(3tcl)					 Terminal control				      term::ansi::code::attr(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME
term::ansi::code::attr - ANSI attribute sequences SYNOPSIS
package require Tcl 8.4 package require term::ansi::code ?0.1? package require term::ansi::code::attr ?0.1? ::term::ansi::code::attr::names ::term::ansi::code::attr::import ?ns? ?arg...? ::term::ansi::code::attr::fgblack ::term::ansi::code::attr::fgred ::term::ansi::code::attr::fggreen ::term::ansi::code::attr::fgyellow ::term::ansi::code::attr::fgblue ::term::ansi::code::attr::fgmagenta ::term::ansi::code::attr::fgcyan ::term::ansi::code::attr::fgwhite ::term::ansi::code::attr::fgdefault ::term::ansi::code::attr::bgblack ::term::ansi::code::attr::bgred ::term::ansi::code::attr::bggreen ::term::ansi::code::attr::bgyellow ::term::ansi::code::attr::bgblue ::term::ansi::code::attr::bgmagenta ::term::ansi::code::attr::bgcyan ::term::ansi::code::attr::bgwhite ::term::ansi::code::attr::bgdefault ::term::ansi::code::attr::bold ::term::ansi::code::attr::dim ::term::ansi::code::attr::italic ::term::ansi::code::attr::underline ::term::ansi::code::attr::blink ::term::ansi::code::attr::revers ::term::ansi::code::attr::hidden ::term::ansi::code::attr::strike ::term::ansi::code::attr::nobold ::term::ansi::code::attr::noitalic ::term::ansi::code::attr::nounderline ::term::ansi::code::attr::noblink ::term::ansi::code::attr::norevers ::term::ansi::code::attr::nohidden ::term::ansi::code::attr::nostrike ::term::ansi::code::attr::reset _________________________________________________________________ DESCRIPTION
This package provides symbolic names for the ANSI attribute control codes. For each control code a single command is provided which returns this code as its result. None of the commands of this package write to a channel; that is handled by higher level packages, like term::ansi::send. API
INTROSPECTION ::term::ansi::code::attr::names This command is for introspection. It returns as its result a list containing the names of all attribute commands. ::term::ansi::code::attr::import ?ns? ?arg...? This command imports some or all attribute commands into the namespace ns. This is by default the namespace attr. Note that this is relative namespace name, placing the imported command into a child of the current namespace. By default all commands are imported, this can howver be restricted by listing the names of the wanted commands after the namespace argument. ATTRIBUTES ::term::ansi::code::attr::fgblack Set text color to Black. ::term::ansi::code::attr::fgred Set text color to Red. ::term::ansi::code::attr::fggreen Set text color to Green. ::term::ansi::code::attr::fgyellow Set text color to Yellow. ::term::ansi::code::attr::fgblue Set text color to Blue. ::term::ansi::code::attr::fgmagenta Set text color to Magenta. ::term::ansi::code::attr::fgcyan Set text color to Cyan. ::term::ansi::code::attr::fgwhite Set text color to White. ::term::ansi::code::attr::fgdefault Set default text color (Black). ::term::ansi::code::attr::bgblack Set background to Black. ::term::ansi::code::attr::bgred Set background to Red. ::term::ansi::code::attr::bggreen Set background to Green. ::term::ansi::code::attr::bgyellow Set background to Yellow. ::term::ansi::code::attr::bgblue Set background to Blue. ::term::ansi::code::attr::bgmagenta Set background to Magenta. ::term::ansi::code::attr::bgcyan Set background to Cyan. ::term::ansi::code::attr::bgwhite Set background to White. ::term::ansi::code::attr::bgdefault Set default background (Transparent). ::term::ansi::code::attr::bold Bold on. ::term::ansi::code::attr::dim Dim on. ::term::ansi::code::attr::italic Italics on. ::term::ansi::code::attr::underline Underscore on. ::term::ansi::code::attr::blink Blink on. ::term::ansi::code::attr::revers Reverse on. ::term::ansi::code::attr::hidden Hidden on. ::term::ansi::code::attr::strike Strike-through on. ::term::ansi::code::attr::nobold Bold off. ::term::ansi::code::attr::noitalic Italics off. ::term::ansi::code::attr::nounderline Underscore off. ::term::ansi::code::attr::noblink Blink off. ::term::ansi::code::attr::norevers Reverse off. ::term::ansi::code::attr::nohidden Hidden off. ::term::ansi::code::attr::nostrike Strike-through off. ::term::ansi::code::attr::reset Reset all attributes to their default values. BUGS, IDEAS, FEEDBACK This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category term of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for either package and/or documentation. KEYWORDS
ansi, attribute control, color control, control, terminal CATEGORY
Terminal control COPYRIGHT
Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net> term 0.1 term::ansi::code::attr(3tcl)
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