From 54e06e03aad71888b3b05a1c249b170f3856da69 Mon Sep 17 00:00:00 2001
From: miguel <miguel@localhost>
Date: Thu, 15 Mar 2018 23:36:59 +0100
Subject: v0.2

---
 piper_webext.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 piper_webext.c

(limited to 'piper_webext.c')

diff --git a/piper_webext.c b/piper_webext.c
new file mode 100644
index 0000000..172039e
--- /dev/null
+++ b/piper_webext.c
@@ -0,0 +1,73 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <glib.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "piper_webext.h"
+
+static int pipe_out_fd;
+static void (*pipe_in_callback)(char *msg);
+
+// returns full path to pipe in users runtime dir.
+// dont forge't to g_free after use
+static gchar* getpath(char *path)
+{
+    return g_strdup_printf("%s/piper-%s",g_get_user_runtime_dir(),path);
+}
+
+// callback function wrapper for received messages
+static gboolean mycallback(GIOChannel *ch, GIOCondition c, gpointer p)
+{
+    gchar *line;
+    g_io_channel_read_line(ch, &line, NULL, NULL, NULL);
+    g_strchomp(line);
+    pipe_in_callback(line);
+    g_free(line);
+    return true;
+}
+
+static void register_callback(char *path)
+{
+	gchar *fullpath=getpath(path);
+	mkfifo(fullpath,0600);
+	GMainContext *ctx = g_main_context_default();
+	GIOChannel *io = g_io_channel_new_file(fullpath, "r+", NULL);
+	GSource *watch = g_io_create_watch(io, G_IO_IN);
+	g_source_attach(watch,ctx);
+	g_source_set_callback(watch,(GSourceFunc)mycallback,NULL,NULL);
+	g_free(fullpath);
+}
+
+// open for writing, lock and return pipe fd
+static int piper_lock(char *path)
+{
+	gchar *fullpath=getpath(path);
+	mkfifo(fullpath,0600);
+	int pipe=open(fullpath, O_RDWR | O_CREAT | O_TRUNC);
+	g_free(fullpath);
+	if(pipe == -1) return -1;
+	int lock=lockf(pipe,F_TLOCK,0);
+	if(lock == -1) return -1;
+	return pipe;
+}
+
+void piper_init(char *path_in,char *path_out,void (*callback_func)(char *msg))
+{
+	pipe_in_callback=callback_func;
+        pipe_out_fd=piper_lock(path_out);
+	if(pipe_out_fd==-1)
+	{
+	    g_print("can not get exclusive lock! Bailing out.\n");
+	    exit(0);
+	}
+	register_callback(path_in);
+}
+
+void piper_send(char *msg)
+{
+        int ret=write(pipe_out_fd,msg,strlen(msg));
+	if(ret==-1)g_print("Can not write to pipe :(\n");
+}
-- 
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