find the fully-qualified path for the app my module is running in Post: 95389

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Top Forums Programming find the fully-qualified path for the app my module is running in Post 95389 by vino on Tuesday 10th of January 2006 11:58:14 PM

01-11-2006

Registered User

Quote:

Originally Posted by jim mcnamara

There is no one perfect way to do this in Linux/Unix.

I agree. But the following solution might work for the OP (Caution.. a /proc based solution.)

Code:

#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

/* Finds the path containing the currently running program executable.
  The path is placed into BUFFER, which is of length LEN. Returns
  the number of characters in the path, or -1 on error. */

size_t get_executable_path (char* buffer, size_t len)
{
 char* path_end;
 /* Read the target of /proc/self/exe. */
 if (readlink ("/proc/self/exe", buffer, len) <= 0)
  return -1;
 /* Find the last occurrence of a forward slash, the path separator. */
 path_end = strrchr (buffer, '/');
 if (path_end == NULL)
  return -1;
 /* Advance to the character past the last slash. */
 ++path_end;
 /* Obtain the directory containing the program by truncating the
   path after the last slash. */
 *path_end = '\0';
 /* The length of the path is the number of characters up through the
   last slash. */
 return (size_t) (path_end - buffer);
}

int main ()
{
 char path[PATH_MAX];
 get_executable_path (path, sizeof (path));
 printf ("this program is in the directory %s\n", path);
 return 0;
}

This solution fixes problems such as env settings which are exclusive for the app, and which are required to be set by the user prior to executing the app.

I picked this up from the net a long time ago.

Last edited by vino; 01-11-2006 at 01:11 AM..

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LEARN ABOUT OSX

mac::apps::launch

Launch(3)						User Contributed Perl Documentation						 Launch(3)

NAME

       Mac::Apps::Launch - Mac module to launch /quit applications

SYNOPSIS

	   use Mac::Apps::Launch;
	   my @apps = qw(R*ch Arch MPGP);
	   my $path = "HD:System Folder:Finder";
	   LaunchApps([@apps], 1) or warn $^E; # launch and switch to front
	   LaunchApps([@apps])	  or warn $^E; # launch and don't switch
	   LaunchApps($app, 1)	  or warn $^E; # launch and switch to front
	   LaunchSpecs($path, 1)  or warn $^E; # use path instead of app ID
	   QuitApps(@apps)	  or warn $^E; # quit all @apps
	   QuitAllApps(@apps)	  or warn $^E; # quit all except @apps
	   IsRunning('MACS');		       # returns boolean for whether
					       # given app ID is running
	   SetFront('MACS')	  or warn $^E; # set Finder to front
	   Hide('MACS') 	  or warn $^E; # hide Finder
	   Show('Finder', 1)	  or warn $^E; # show Finder (1 == use name)

DESCRIPTION

       Simply launch or quit applications by their creator ID.	The Finder can be quit in this way, though it cannot be launched in this way.

       This module is used by many other modules.

       This module as written does not work with MacPerls prior to 5.1.4r4.

       "Hide" and "Show" do not currently work on Mac OS X.

       Apps that don't have signatures under Mac OS X currently aren't handled, except with LaunchSpecs().

       "SetFront" and "IsRunning" can take a four-char creator ID ('MACS'), a bundle ID ('com.apple.Finder'), or a path
       (/System/Library/CoreServices/Finder.app).  They both optionally take a second parameter which affirms that the data is indeed a path (for
       those rare cases where a path might possibly look like a creator ID or bundle ID ... you never know).

       "IsRunning" will return the PSN of the application if it is running, which you can then use for targetting the app, or converting to a PID
       (with "Mac::Processes::GetProcessPID()"), to send signals to it.

EXPORT

       Exports functions "QuitApps", "QuitAllApps", and "LaunchApps", "IsRunning", "LaunchSpecs", "SetFront", "Hide", "Show".

AUTHOR

       Chris Nandor <pudge@pobox.com>, http://pudge.net/

       Copyright (c) 1999-2005 Chris Nandor.  All rights reserved.  This program is free software; you can redistribute it and/or modify it under
       the same terms as Perl itself.

perl v5.16.2							    2007-01-03								 Launch(3)

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