icon Top 9 categories map      RocketAware > Perl >

How do I open a file without blocking?

Tips: Browse or Search all pages for efficient awareness of Perl functions, operators, and FAQs.


Search Perl pages


By activity
Professions, Sciences, Humanities, Business, ...

User Interface
Text-based, GUI, Audio, Video, Keyboards, Mouse, Images,...

Text Strings
Conversions, tests, processing, manipulation,...

Integer, Floating point, Matrix, Statistics, Boolean, ...

Algorithms, Memory, Process control, Debugging, ...

Stored Data
Data storage, Integrity, Encryption, Compression, ...

Networks, protocols, Interprocess, Remote, Client Server, ...

Hard World
Timing, Calendar and Clock, Audio, Video, Printer, Controls...

File System
Management, Filtering, File & Directory access, Viewers, ...


How do I open a file without blocking?

You need to use the O_NDELAY or O_NONBLOCK flag from the Fcntl module in conjunction with sysopen():

    use Fcntl;
    sysopen(FH, "/tmp/somefile", O_WRONLY|O_NDELAY|O_CREAT, 0644)
    or die "can't open /tmp/somefile: $!":

Source: Perl FAQ: Files and Formats
Copyright: Copyright (c) 1997 Tom Christiansen and Nathan Torkington.
Next: How do I create a file only if it doesn't exist?

Previous: How can I tell if there's a character waiting on a filehandle?

(Corrections, notes, and links courtesy of RocketAware.com)

[Overview Topics]

Up to: File Access

Rapid-Links: Search | About | Comments | Submit Path: RocketAware > Perl > perlfaq5/How_do_I_open_a_file_without_blo.htm
RocketAware.com is a service of Mib Software
Copyright 2000, Forrest J. Cavalier III. All Rights Reserved.
We welcome submissions and comments