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| -rw-r--r-- | plugin_button_exec.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/plugin_button_exec.c b/plugin_button_exec.c new file mode 100644 index 0000000..2568d54 --- /dev/null +++ b/plugin_button_exec.c @@ -0,0 +1,114 @@ +/* $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 */ +} |