new plugin: button_exec by Wolfgang Henerbichler

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@859 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

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 */
+}