From 88d414ce800b0faaf549fe91543de04ae9461a4d Mon Sep 17 00:00:00 2001
From: David Delassus <david.jose.delassus@gmail.com>
Date: Mon, 17 Oct 2011 20:39:48 +0200
Subject: [PATCH] Add FIFO, FIFO located at : ${TMPDIR}/wmfs-${DISPLAY}.fifo

---
 Makefile.in |  1 +
 src/fifo.c  | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/fifo.h  | 19 +++++++++++++++
 src/wmfs.c  | 41 ++++++++++++++++++++++++++++++---
 src/wmfs.h  |  7 ++++++
 5 files changed, 131 insertions(+), 3 deletions(-)
 create mode 100644 src/fifo.c
 create mode 100644 src/fifo.h

diff --git a/Makefile.in b/Makefile.in
index 2a28d55..6303370 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -16,6 +16,7 @@ SRCS=                 \
       src/screen.c    \
       src/tag.c       \
       src/util.c      \
+      src/fifo.c      \
       src/wmfs.c
 
 
diff --git a/src/fifo.c b/src/fifo.c
new file mode 100644
index 0000000..3e9ba73
--- /dev/null
+++ b/src/fifo.c
@@ -0,0 +1,66 @@
+/*
+ *  wmfs2 by Martin Duquesnoy <xorg62@gmail.com> { for(i = 2011; i < 2111; ++i) ©(i); }
+ *  File created by David Delassus.
+ *  For license, see COPYING.
+ */
+
+#include "wmfs.h"
+#include "util.h"
+#include "config.h"
+#include "fifo.h"
+
+void
+fifo_init(void)
+{
+     xasprintf(&(W->fifo.path), "%s/wmfs-%s.fifo", P_tmpdir, DisplayString(W->dpy));
+
+     if(mkfifo(W->fifo.path, 0644) < 0 || !(W->fifo.fd = open(W->fifo.path, O_NONBLOCK, 0)))
+          warnx("Can't create FIFO: %s\n", strerror(errno));
+}
+
+static void
+fifo_parse(char *cmd)
+{
+     void (*func)(Uicb);
+     char *uicb = NULL;
+     char *arg  = NULL;
+     char *p    = NULL;
+
+     /* remove trailing newline */
+     if((p = strchr(cmd, '\n')))
+          *p = 0;
+
+     /* Check if an argument is present */
+     if((p = strchr(cmd, ' ')))
+     {
+          *p = 0;
+          arg = xstrdup(p + 1);
+     }
+     uicb = xstrdup(cmd);
+
+     /* call the UICB function */
+     func = uicb_name_func(uicb);
+     if(func)
+          func(arg);
+
+     if(arg)
+          free(arg);
+     free(uicb);
+
+     XSync(W->dpy, false);
+}
+
+void
+fifo_read(void)
+{
+     char buf[256] = {0};
+
+     /* Don't read it if not open */
+     if(!(W->fifo.fd))
+          return;
+
+     read(W->fifo.fd, buf, sizeof(buf) - 1);
+
+     if(buf[0])
+          fifo_parse(buf);
+}
diff --git a/src/fifo.h b/src/fifo.h
new file mode 100644
index 0000000..81a6a57
--- /dev/null
+++ b/src/fifo.h
@@ -0,0 +1,19 @@
+/*
+ *  wmfs2 by Martin Duquesnoy <xorg62@gmail.com> { for(i = 2011; i < 2111; ++i) ©(i); }
+ *  File created by David Delassus.
+ *  For license, see COPYING.
+ */
+
+#ifndef __FIFO_H
+#define __FIFO_H
+
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+
+void fifo_init(void);
+void fifo_read(void);
+
+#endif /* __FIFO_H */
diff --git a/src/wmfs.c b/src/wmfs.c
index d146b06..4c96c33 100644
--- a/src/wmfs.c
+++ b/src/wmfs.c
@@ -15,6 +15,7 @@
 #include "util.h"
 #include "config.h"
 #include "client.h"
+#include "fifo.h"
 
 int
 wmfs_error_handler(Display *d, XErrorEvent *event)
@@ -241,10 +242,35 @@ static void
 wmfs_loop(void)
 {
      XEvent ev;
+     int fd = ConnectionNumber(W->dpy);
+     int maxfd = fd + 1;
+     fd_set iset;
 
-     while(XPending(W->dpy))
-          while(W->running && !XNextEvent(W->dpy, &ev))
-               EVENT_HANDLE(&ev);
+     if(W->fifo.fd > 0)
+          maxfd += W->fifo.fd;
+
+     while(W->running)
+     {
+          FD_ZERO(&iset);
+          FD_SET(fd, &iset);
+
+          if(W->fifo.fd > 0)
+               FD_SET(W->fifo.fd, &iset);
+
+          if(select(maxfd, &iset, NULL, NULL, NULL) > 0)
+          {
+               if(FD_ISSET(fd, &iset))
+               {
+                    while(XPending(W->dpy))
+                    {
+                         XNextEvent(W->dpy, &ev);
+                         EVENT_HANDLE(&ev);
+                    }
+               }
+               else if(W->fifo.fd > 0 && FD_ISSET(W->fifo.fd, &iset))
+                    fifo_read();
+          }
+     }
 }
 
 static inline void
@@ -255,6 +281,7 @@ wmfs_init(void)
      screen_init();
      event_init();
      config_init();
+     fifo_init();
 }
 
 void
@@ -290,6 +317,14 @@ wmfs_quit(void)
           free(t);
      }
 
+     /* FIFO stuffs */
+     if(W->fifo.fd > 0)
+     {
+          close(W->fifo.fd);
+          unlink(W->fifo.path);
+     }
+     free(W->fifo.path);
+
      free(W->net_atom);
      free(W);
 
diff --git a/src/wmfs.h b/src/wmfs.h
index 39aaab9..776ab2f 100644
--- a/src/wmfs.h
+++ b/src/wmfs.h
@@ -223,6 +223,13 @@ struct wmfs
      Atom *net_atom;
      bool running;
 
+     /* FIFO stuffs */
+     struct
+     {
+          char *path;
+          int fd;
+     } fifo;
+
      /* Lists heads */
      struct
      {