From 5228b499ae2aaf77a7203a33a6a3216854fbe479 Mon Sep 17 00:00:00 2001
From: michux <michux@3ae390bd-cb1e-0410-b409-cd5a39f66f1f>
Date: Thu, 10 Apr 2008 14:45:45 +0000
Subject: Add basic FIFO plugin

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@869 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
---
 plugin_fifo.c | 180 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 180 insertions(+)
 create mode 100644 plugin_fifo.c

(limited to 'plugin_fifo.c')

diff --git a/plugin_fifo.c b/plugin_fifo.c
new file mode 100644
index 0000000..12a9374
--- /dev/null
+++ b/plugin_fifo.c
@@ -0,0 +1,180 @@
+/* $Id$
+ * $URL$
+ *
+ * plugin template
+ *
+ * Copyright (C) 2008 Michael Vogt <michu@neophob.com>
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * 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.
+ *
+ */  
+    
+/* 
+ * Quick fifo hack for lcd4linux
+ * 
+ * most code is ripped ...
+ *
+ */ 
+    

+/* define the include files you need */ 
+#include "config.h"
+    
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+    
+/* these should always be included */ 
+#include "debug.h"
+#include "plugin.h"
+#include "cfg.h"
+    
+#ifdef WITH_DMALLOC
+#include <dmalloc.h>
+#endif	/* 
 */
+    
+#define FIFO_BUFFER_SIZE 80
+    
typedef struct _FifoData {
+    
char *path;
+    
 int input;
+    
 int created;
+
 
} FifoData;
+

static char Section[] = "Plugin:FIFO";
+

static FifoData fd;
+
static char msg[FIFO_BUFFER_SIZE];
+
static char fifopath[1024];
+

static void configure_fifo(void) 
+{
+    
char *s;
+    
s = cfg_get(Section, "fifopath", "/tmp/lcd4linux.fifo");
+    
if (*s == '\0') {
+	
info("[FIFO] empty '%s.fifopath' entry from %s, assuming '/tmp/lcd4linux.fifo'", Section, cfg_source());
+	
strcpy(fifopath, "/tmp/lcd4linux.fifo");
+    
} else
+	
strcpy(fifopath, s);
+    

free(s);
+
}
+


static void removeFifo() 
+{
+    
debug("Removing FIFO \"%s\"\n", fd.path);
+    

if (unlink(fd.path) < 0) {
+	
error("Could not remove FIFO \"%s\": %s\n", fd.path, strerror(errno));
+	
return;
+    
}
+    

fd.created = 0;
+
}
+

static void closeFifo() 
+{
+    
struct stat st;
+    

if (fd.input >= 0) {
+	
close(fd.input);
+	
fd.input = -1;
+    
}
+    

if (fd.created && (stat(fd.path, &st) == 0))
+	
removeFifo(fd);
+
}
+

static int makeFifo() 
+{
+    
if (mkfifo(fd.path, 0666) < 0) {
+	
error("Couldn't create FIFO \"%s\": %s\n", fd.path, strerror(errno));
+	
return -1;
+    
}
+    

fd.created = 1;
+    

return 0;
+
}
+


static int checkFifo() 
+{
+    
struct stat st;
+    
if (stat(fd.path, &st) < 0) {
+	
if (errno == ENOENT) {
+	    
+		/* Path doesn't exist */ 
+		return makeFifo(fd);
+	
}
+	

error("Failed to stat FIFO \"%s\": %s\n", fd.path, strerror(errno));
+	
return -1;
+    
}
+    

if (!S_ISFIFO(st.st_mode)) {
+	
error("\"%s\" already exists, but is not a FIFO\n", fd.path);
+	
return -1;
+    
}
+    

return 0;
+
}
+

static int openFifo() 
+{
+    
if (checkFifo() < 0)
+	
return -1;
+    

fd.input = open(fd.path, O_RDONLY | O_NONBLOCK);
+    
if (fd.input < 0) {
+	
error("Could not open FIFO \"%s\" for reading: %s\n", fd.path, strerror(errno));
+	
closeFifo();
+	
return -1;
+    
}
+    

return 0;
+
}
+

static void fiforead(RESULT * result) 
+{
+    
char buf[FIFO_BUFFER_SIZE];
+    
int i, bytes = 1;
+    
memset(buf, 0, FIFO_BUFFER_SIZE);
+    

strcat(buf, "ERROR");
+    
if (checkFifo() == 0) {
+	
memset(buf, 0, FIFO_BUFFER_SIZE);
+	
while (bytes > 0 && errno != EINTR)
+	    
bytes = read(fd.input, buf, FIFO_BUFFER_SIZE);
+	

if (bytes < 0) {
+	    
error("[FIFO] Error %i: %s\n", errno, strerror(errno));
+	
} else {
+	    

if (strlen(buf) > 0) {
+		
strcpy(msg, buf);
+	    
}
+	    

for (i = 0; i < strlen(buf); i++) {
+		
if (msg[i] < 0x20)
+		    
msg[i] = ' ';
+	    
}
+	
}
+    
}
+    

+	/* store result */ 
+	SetResult(&result, R_STRING, msg);
+
}
+
+

+/* plugin initialization */ 
+int plugin_init_fifo(void) 
+{
+    
configure_fifo();
+    

fd.path = fifopath;
+    
fd.input = -1;
+    
fd.created = 0;
+    

if (openFifo() < 0) {
+	
return -1;
+    
}
+    

memset(msg, 0, FIFO_BUFFER_SIZE);
+    
AddFunction("fifo::read", 0, fiforead);
+    

return 0;
+
}
+

void plugin_exit_fifo(void) 
+{
+    
+	/* close filedescriptors */ 
+	closeFifo();
+
} 
-- 
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