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#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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