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Full Discussion: Regaring File Table entry
Operating Systems Linux Fedora Regaring File Table entry Post 302394637 by darshan.ghumare on Friday 12th of February 2010 06:20:55 AM
Old 02-12-2010
Regaring File Table entry

Hi,

I have written following code & ran it on Fedora Linux.
Before executing it I have created a.txt (touch a.txt).

Code:
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>

int main()
{
    int fd1, rc;

    fd1 = open("a.txt", O_WRONLY);
    if (fd1 == -1)
    {
        printf("Open error\n");
        return -1;
    }
    write(fd1, "ABCD", 4);
    if (fork() > 0)
    {
        write(fd1, "XYZ", 3);
        return 0;
    }
    wait(&rc);
    write(fd1, "EFGH", 4);
    return 0;
}

Why contents of a.txt are "ABCDXYZEFGH"?
More precisely, why kernel had not created separate entry in File Table for child process?
What is the reason behind sharing of File Table entry between parent & child process?
I think as child is independent process. Then if it has written at offset 10 then offset will be incremented to 11 but parent offset should remain at 10 only.
 

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Graphics::Primitive::Insets(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Insets(3pm)

NAME
Graphics::Primitive::Insets - Space between things DESCRIPTION
Graphics::Primitive::Insets represents the amount of space that surrounds something. This object can be used to represent either padding or margins (in the CSS sense, one being inside the bounding box, the other being outside) SYNOPSIS
use Graphics::Primitive::Insets; my $insets = Graphics::Primitive::Insets->new({ top => 5, bottom => 5, left => 5, right => 5 }); METHODS
Constructor new Creates a new Graphics::Primitive::Insets. Instance Methods as_array Return these insets as an array in the form of top, right, bottom and left. bottom Set/Get the inset from the bottom. equal_to Determine if these Insets are equal to another. left Set/Get the inset from the left. right Set/Get the inset from the right. top Set/Get the inset from the top. zero Sets all the insets (top, left, bottom, right) to 0. AUTHOR
Cory Watson, "<gphat@cpan.org>" SEE ALSO
perl(1) COPYRIGHT &; LICENSE Copyright 2008-2010 by Cory G Watson. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.3 2010-08-21 Graphics::Primitive::Insets(3pm)
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