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Top Forums Programming Problem on capturing system Shutdown Post 302847699 by Corona688 on Tuesday 27th of August 2013 03:04:25 PM
Old 08-27-2013
Quote:
I also have this simple question: Why not use async-unsafe functions after all? The worse thing that could happen would be the application to crash or to be in a loop easily terminated with SIGKILL.
I think you just answered your own question.
Quote:
The application was going to forcefully terminate after all. At least give it a chance to do a proper cleanup.
You can give it more than a chance -- you can actually do so. Async-safe system calls include open(), close(), read(), and write() among many other things. All you need.

fopen, printf() and its relatives in particular are not signal safe because they allocate memory. You might get away with it by accident but it's system-dependent, compiler-dependent, library-dependent, and luck-dependent. Your code may work all the time on your system and crash all the time on someone else's.

To write code that'll work both here and there, use signal-safe things. That's what they're for.
 

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page_util_quote(n)					      Parser generator tools						page_util_quote(n)

__________________________________________________________________________________________________________________________________________________

NAME
page_util_quote - page character quoting utilities SYNOPSIS
package require page::util::quote ?0.1? package require snit ::page::util::quote::unquote char ::page::util::quote::quote'tcl char ::page::util::quote::quote'tclstr char ::page::util::quote::quote'tclcom char _________________________________________________________________ DESCRIPTION
This package provides a few utility commands to convert characters into various forms. API
::page::util::quote::unquote char A character, as stored in an abstract syntax tree by a PEG processor (See the packages grammar::peg::interpreter, grammar::me, and their relations), i.e. in some quoted form, is converted into the equivalent Tcl character. The character is returned as the result of the command. ::page::util::quote::quote'tcl char This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser, will regenerate the character in question and is 7bit ASCII. The string is returned as the result of this command. ::page::util::quote::quote'tclstr char This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser and will generate a human readable representation of the character in question. The string is returned as the result of this command. The string does not use any unprintable characters. It may use backslash-quoting. High UTF characters are quoted to avoid problems with the still prevalent ascii terminals. It is assumed that the string will be used in a double-quoted environment. ::page::util::quote::quote'tclcom char This command takes a Tcl character (internal representation) and converts it into a string which is accepted by the Tcl parser when used within a Tcl comment. The string is returned as the result of this command. BUGS, IDEAS, FEEDBACK This document, will undoubtedly contain bugs and other problems. Please report such in the category page of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have. KEYWORDS
page, parser generator, quoting, text processing CATEGORY
Page Parser Generator COPYRIGHT
Copyright (c) 2007 Andreas Kupries <andreas_kupries@users.sourceforge.net> page 1.0 page_util_quote(n)
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