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Full Discussion: cathcing `mozilla -remote ping()` within c++
Top Forums Programming cathcing `mozilla -remote ping()` within c++ Post 85129 by vino on Sunday 2nd of October 2005 07:16:10 AM
Old 10-02-2005
Looks like no one has faced this problem before.

Anyway here is a solution. I am exploiting the following fact.

Code:
@mozilla is not running for user1.
[user1]$ mozilla -remote ping()
No running window found.
[user1]$ echo $?
2
[user1]$

Code:
@mozilla is running for current user1
[user1]$ mozilla -remote ping()
[user1]$ echo $?
0
[user1]$

Which means if there is no instance of mozilla running, then it throws up No running window found. i.e. output will come via stderr

To confirm the above case, here is a snippet of the relevant lines from the strace output.

Code:
write(2, "No running window found.\n", 25No running window found.
) = 25

If there is an instance of mozilla running, then no such line will be found.

Here is the relevant code.

Code:
#include <stdio.h>
#include <string.h>
main()
{
        FILE* pipe;
        char str[25] = { 0 };
        pipe=popen("/usr/bin/mozilla -remote \"ping()\" 2>&1","r");

        // No running window found. 
        // or 
        // Error: No running window found.        
        // is what we are trying to capture. 
        // Anything else, is same as nada.

        // Caution.
        // Might have to increase the size from 25 to 32
        fgets(str,25,pipe);
        printf("%s",str);

        pclose(pipe);
}

Based on the contents of str, we can move ahead.

Vino
Last edited by vino; 12-17-2005 at 06:13 AM.. Reason: Recent change in mozilla's error message
 

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LEARN ABOUT MINIX

firefox

FIREFOX(1)							Linux User's Manual							FIREFOX(1)

NAME

       firefox - a Web browser for X11 derived from the Mozilla browser

SYNOPSIS

       firefox [OPTIONS] [URL]

DESCRIPTION

       Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability.

USAGE

       firefox is a simple shell script that will set up the environment for the actual executable.

OPTIONS

       A summary of the options supported by firefox is included below.

   GTK options
       --gdk-debug=FLAGS Gdk debugging flags to set

       --gdk-no-debug=FLAGS
	      Gdk debugging flags to unset

       --gtk-debug=FLAGS
	      Gtk+ debugging flags to set

       --gtk-no-debug=FLAGS
	      Gtk+ debugging flags to unset

       --gtk-module=MODULE
	      Load an additional Gtk module

   X11 options
       --display=DISPLAY
	      X display to use

       --sync Make X calls synchronous

       --no-xshm
	      Don't use X shared memory extension

       --xim-preedit=STYLE

       --xim-status=STYLE

       --g-fatal-warnings
	      Make all warnings fatal

   Firefox options
       -h, -help
	      Show summary of options.

       -height value
	      Set height of startup window to value.

       -width value
	      Set width of startup window to value.

       -v, -version
	      Print /usr/bin/firefox-bin version.

       -CreateProfile profile
	      Create profile.

       -P profile
	      Start with profile.

       -ProfileManager
	      Start with profile manager.

       -UILocale lang-region
	      Start with lang-region resources.

       -contentLocale lang-region
	      Start with lang-region resources.

       -remote command
	      Execute command in an already running Firefox process.  For more info, see: http://www.mozilla.org/unix/remote.html

       -no-remote
	      Don't try to control an already running instance.

       -jsconsole
	      Start with Javascript Console

       -chrome url
	      Load the specified chrome.

       -new-window url
	      Open URL in a new window if Firefox is already running.

       -new-tab url
	      Open URL in a new tab if Firefox is already running.

       -preferences
	      Open Firefox preferences menu.

       -safe-mode
	      Disables extensions and themes for this session.

       FILES  /usr/bin/firefox - shell script wrapping firefox
	      /usr/lib/firefox/firefox - firefox executable

VERSION

       3.0

BUGS

       To report a bug, please visit http://bugzilla.mozilla.org/

SEE ALSO

       mozilla(1)

AUTHORS

       The Mozilla Organization
	      http://www.mozilla.org/about.html

firefox 							 January 04, 2006							FIREFOX(1)
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