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Full Discussion: C. To segmentation fault or not to segmentation fault, that is the question.
Top Forums Programming C. To segmentation fault or not to segmentation fault, that is the question. Post 303032348 by wisecracker on Friday 15th of March 2019 12:14:06 PM
Old 03-15-2019
C. To segmentation fault or not to segmentation fault, that is the question.
Oddities with gcc, 2.95.3 for the AMIGA and 4.2.1 for MY current OSX 10.14.1...

I am creating a basic calculator for the AMIGA ADE *NIX emulator in C as it does not have one.

Below are two very condensed snippets of which I have added the results inside the each code section.

IMPORTANT! This will NOT even compile on gcc 2.95.3 for the AMIGA, but WORKS correctly on OSX 10.14.1, gcc 4.2.1.
Code:
/* No_error gcc 4.2.1 demo. */

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int NUM_1;
int NUM_2;
char CHARACTER;

int main(int argc, char *argv[])
{
    /* Conditional BEFORE _variables_! */
    if (argc <= 3)
    {
        printf("ERROR!\n\n");
        printf("Not enough arguments!\n");
        exit(1);
    }

    int NUM_1 = strtod(argv[1], NULL);
    int NUM_2 = strtod(argv[3], NULL);
    CHARACTER = *argv[2];

    printf("\n%i, %i, %c\n\n", NUM_1, NUM_2, CHARACTER);

    return(0);
}


/* ****************************************
     Results OSX 10.14.1, gcc 4.2.1...

Last login: Fri Mar 15 14:45:03 on ttys000
AMIGA:amiga~> cd Desktop/Code/C
AMIGA:amiga~/Desktop/Code/C> gcc noerror.c
AMIGA:amiga~/Desktop/Code/C> ./a.out
ERROR!

Not enough arguments!
AMIGA:amiga~/Desktop/Code/C> ./a.out 1 v
ERROR!

Not enough arguments!
AMIGA:amiga~/Desktop/Code/C> ./a.out 1 v 3

1, 3, v

AMIGA:amiga~/Desktop/Code/C> _

**************************************** */

ALSO IMPORTANT! This compiles and WORKS perfectly on the AMIGA but gives a segmentation fault on OSX 10.14.1, gcc 4.2.1.
Code:
/* Error gcc 4.2.1 demo. */

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int NUM_1;
int NUM_2;
char CHARACTER;

int main(int argc, char *argv[])
{
    int NUM_1 = strtod(argv[1], NULL);
    int NUM_2 = strtod(argv[3], NULL);
    CHARACTER = *argv[2];

    /* Conditional AFTER _variables_! */
    if (argc <= 3)
    {
        printf("ERROR!\n\n");
        printf("Not enough arguments!\n");
        exit(1);
    }

    printf("\n%i, %i, %c\n\n", NUM_1, NUM_2, CHARACTER);

    return(0);
}

/* ****************************************

Last login: Fri Mar 15 15:48:37 on ttys000
AMIGA:amiga~> cd Desktop/Code/C
AMIGA:amiga~/Desktop/Code/C> gcc error.c
AMIGA:amiga~/Desktop/Code/C> ./a.out
Segmentation fault: 11
AMIGA:amiga~/Desktop/Code/C> ./a.out 1 r
Segmentation fault: 11
AMIGA:amiga~/Desktop/Code/C> ./a.out 1 r 6

1, 6, r

AMIGA:amiga~/Desktop/Code/C> _

**************************************** */

As you can see the second code gives a Segmentation fault: 11 on OSX 10.14.1, gcc 4.2.1 but compiles and works correctly on the AMIGA.

Can anyone explain why there is a SEGMENTATION FAULT when the if conditional statement is inside the 'main()' function to start with and the assignments set?
 

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LEARN ABOUT DEBIAN

desktop::notify

Desktop::Notify(3pm)					User Contributed Perl Documentation				      Desktop::Notify(3pm)

NAME

       Desktop::Notify - Communicate with the Desktop Notifications framework

VERSION

       Version 0.03

SYNOPSIS

	   use Desktop::Notify;

	   # Open a connection to the notification daemon
	   my $notify = Desktop::Notify->new();

	   # Create a notification to display
	   my $notification = $notify->create(summary => 'Desktop::Notify',
					      body => 'Hello, world!',
					      timeout => 5000);

	   # Display the notification
	   $notification->show();

	   # Close the notification later
	   $notification->close();

DESCRIPTION

       This module provides a Perl interface to the Desktop Notifications framework.

       The framework allows applications to display pop-up notifications on an X desktop.  This is implemented with two components: a daemon that
       displays the notifications, and a client library used by applications to send notifications to the daemon.  These components communicate
       through the DBus message bus protocol.

       More information is available from <http://trac.galago-project.org/wiki/DesktopNotifications>

       This module serves the same purpose as "libnotify", in an object-oriented Perl interface.  It is not, however, an interface to "libnotify"
       itself, but a separate implementation of the specification using Net::DBus.

METHODS

   new %opts
       Connect to the notification daemon. %opts can include the following options:

       app_name
	   The application name to use for notifications. Default is "basename($0)"

       bus The Net::DBus mesage bus to use. Default is to call Net::DBus->session, which is usually where notification-daemon can be reached.

       service
	   The DBus service name of the daemon. Default is org.freedesktop.Notifications.

       objpath
	   The path to the notifications DBus object. Default is /org/freedesktop/Notifications.

       objiface
	   The DBus interface to access the notifications object as. Default is org.freedesktop.Notifications.

   create %params
       Creates a new notification object that can be displayed later. This will return a Desktop::Notify::Notification object; see that module for
       information about using it.

   close_callback $coderef
       Sets a user-specified function to be called whenever a notification is closed.  It will be called with one argument, which is the
       Notification object that was just closed.

AUTHOR

       Stephen Cavilia, "<sac at atomicradi.us>"

SEE ALSO

       Net::DBus

       <http://www.galago-project.org/specs/notification/index.php>

       <http://www.galago-project.org/downloads.php>

BUGS

       Please report any bugs or feature requests to "bug-desktop-notify at rt.cpan.org", or through the web interface at
       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Desktop-Notify>.  I will be notified, and then you'll automatically be notified of progress
       on your bug as I make changes.

SUPPORT

       You can find documentation for this module with the perldoc command.

	   perldoc Desktop::Notify

       You can also look for information at:

       o   AnnoCPAN: Annotated CPAN documentation

	   <http://annocpan.org/dist/Desktop-Notify>

       o   CPAN Ratings

	   <http://cpanratings.perl.org/d/Desktop-Notify>

       o   RT: CPAN's request tracker

	   <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Desktop-Notify>

       o   Search CPAN

	   <http://search.cpan.org/dist/Desktop-Notify>

ACKNOWLEDGEMENTS

COPYRIGHT &; LICENSE
       Copyright 2007 Stephen Cavilia, all rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2009-12-24						      Desktop::Notify(3pm)
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