Add basic FIFO plugin

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@869 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

4 files changed, 197 insertions, 0 deletions

diff --git a/Makefile.am b/Makefile.am
index dd1880d..54ce1f9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -114,6 +114,7 @@ plugin_cpuinfo.c              \
 plugin_diskstats.c            \
 plugin_dvb.c                  \
 plugin_exec.c                 \
+plugin_fifo.c                 \
 plugin_file.c                 \
 plugin_gps.c                  \
 plugin_i2c_sensors.c          \
diff --git a/plugin.c b/plugin.c
index 3581229..66966ae 100644
--- a/plugin.c
+++ b/plugin.c
@@ -68,6 +68,8 @@ int plugin_init_dvb(void);
 void plugin_exit_dvb(void);
 int plugin_init_exec(void);
 void plugin_exit_exec(void);
+int plugin_init_fifo(void);
+void plugin_exit_fifo(void);
 int plugin_init_file(void);
 void plugin_exit_file(void);
 int plugin_init_gps(void);
@@ -144,6 +146,9 @@ int plugin_init(void)
 #ifdef PLUGIN_EXEC
     plugin_init_exec();
 #endif
+#ifdef PLUGIN_FIFO
+    plugin_init_fifo();
+#endif
 #ifdef PLUGIN_FILE
     plugin_init_file();
 #endif
@@ -242,6 +247,9 @@ void plugin_exit(void)
 #ifdef PLUGIN_EXEC
     plugin_exit_exec();
 #endif
+#ifdef PLUGIN_FIFO
+    plugin_exit_fifo();
+#endif
 #ifdef PLUGIN_FILE
     plugin_exit_file();
 #endif
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();
+
} 

diff --git a/plugins.m4 b/plugins.m4
index f2ddf2c..da13c1b 100644
--- a/plugins.m4
+++ b/plugins.m4
@@ -60,6 +60,7 @@ for plugin in $plugins; do
          PLUGIN_DISKSTATS="yes"
          PLUGIN_DVB="yes"
          PLUGIN_EXEC="yes"
+         PLUGIN_FIFO="yes"
          PLUGIN_FILE="yes"
          PLUGIN_GPS="yes"
          PLUGIN_I2C_SENSORS="yes"
@@ -105,6 +106,9 @@ for plugin in $plugins; do
       exec)
          PLUGIN_EXEC=$val
          ;;
+      fifo)
+         PLUGIN_FIFO=$val
+         ;;
       file)
          PLUGIN_FILE=$val
          ;;
@@ -219,6 +223,10 @@ if test "$PLUGIN_FILE" = "yes"; then
    PLUGINS="$PLUGINS plugin_file.o"
    AC_DEFINE(PLUGIN_FILE,1,[file plugin])
 fi
+if test "$PLUGIN_FIFO" = "yes"; then
+   PLUGINS="$PLUGINS plugin_fifo.o"
+   AC_DEFINE(PLUGIN_FIFO,1,[fifo plugin])
+fi
 if test "$PLUGIN_GPS" = "yes"; then
    AC_CHECK_HEADERS(nmeap.h, [has_nmeap_header="true"], [has_nmeap_header="false"])
    if test "$has_nmeap_header" = "true"; then