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/* $Id: plugin_sample.c 840 2007-09-09 12:17:42Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_sample.c $
*
* plugin that forks and exec's once a key is pressed. the difference to the exec plugin is: this can also only be done once!
*
* Copyright (C) 2008, Wolfgang Henerbichler <wogri@wogri.com>
*
* This file is part of LCD4Linux.
*
* LCD4Linux is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* LCD4Linux is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* exported functions:
*
* int plugin_init_button_exec(void)
* adds various functions
*
*/
/* define the include files you need */
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
/* these should always be included */
#include "debug.h"
#include "plugin.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
/* sample function 'button_exec' */
/* takes as many arguments as you want, first arguemnt is the command that will be called via exec, all the following are parameters you want to add to your command - you won't know what has happened after forking - no return codes available */
/* Note: all local functions should be declared 'static' */
static void my_button_exec(RESULT * result, int argc, RESULT * argv[])
{
int pid;
int i;
int errsv;
char *args[argc+1];
char *arg;
char *prog;
char *env[1];
signal(SIGCHLD, SIG_IGN);
prog=R2S(argv[0]);
info(prog);
for (i=1; i < argc; i++) {
arg=R2S(argv[i]);
args[i]=arg;
info(arg);
}
args[i]=(char *) 0;
env[0]=(char *) 0;
pid=fork();
if (pid==0) { // child-process
// char *args[] = {"-r", "-t", "-l", (char *) 0 };
info("executing program");
execve(prog, args, env);
errsv=errno;
info("executing program failed");
info(strerror(errsv));
exit(0);
}
else if (pid==-1) {
info("weird error has occured. couldn't fork.");
}
else {
SetResult(&result, R_STRING, "0");
}
}
/* plugin initialization */
/* MUST NOT be declared 'static'! */
int plugin_init_button_exec(void)
{
/* register all our cool functions */
/* the second parameter is the number of arguments */
/* -1 stands for variable argument list */
AddFunction("button_exec", -1, my_button_exec);
return 0;
}
void plugin_exit_button_exec(void)
{
/* free any allocated memory */
/* close filedescriptors */
}
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