From 1e08b64b43bf9c50b644da3f76d5a8bcc73f62da Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Wed, 19 Sep 2018 01:52:14 +0200
Subject: addding sysfs and pipes etc

---
 fs/fd.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 54 insertions(+), 5 deletions(-)

(limited to 'fs/fd.c')

diff --git a/fs/fd.c b/fs/fd.c
index 43ffb0d..fe34003 100644
--- a/fs/fd.c
+++ b/fs/fd.c
@@ -40,11 +40,10 @@ void* ext2_init(char *path)
     uint32_t inode= ext2_filename_to_inode(VMEM_EXT2_RAMIMAGE,path); 
     data[0]=inode;// inode
     data[1]=0; //pos
-    
     return data;
 }
 
-void ext2_write(void* x)
+void ext2_write(void* x,uint8_t b)
 {
     kpanic("not impl");
 }
@@ -79,6 +78,21 @@ uint8_t sysfs_get(uint32_t *data)
     return ringbuffer_get(data);
 }
 
+void sysfs_write(void* x,uint8_t b)
+{
+    uint32_t **pp=x+sizeof(ringbuffer);
+    void (*p)(uint32_t v)=*pp;
+
+    uint32_t *val=x+sizeof(ringbuffer)+4;
+    val[val[0]]=b;
+    if(val[0]==4) // 4bytes / 32bit
+    {
+	val[0]=1;
+	p(val[1]+256*val[2]+256*256*val[3]+256*256*256*val[4]);
+    }
+    val[0]+=1;
+}
+
 bool sysfs_has(uint32_t *data)
 {
     return true;
@@ -90,6 +104,12 @@ bool sysfs_eof(uint32_t *data)
 }
 
 void sysfs_close(uint32_t *data)
+{
+    ringbuffer_free(data); // free ringbuffer buffer
+    kbfree(data); // free memory holding ringbuffer information
+}
+
+void pipe_close(uint32_t *data)
 {
     ringbuffer *r=data;
     ringbuffer_free(data); // free ringbuffer buffer
@@ -114,6 +134,8 @@ bool fifo_eof(uint32_t* data)
 {
     return false;
 }
+
+// TODO remove and use fd_from_ringbuffer?
 fd fd_from_fifo(fifo* fif)
 {
     fd f;
@@ -127,6 +149,27 @@ fd fd_from_fifo(fifo* fif)
     return f;
 }
 
+fd fd_from_pipe()
+{
+    fd f;
+    f.type=FD_TYPE_PIPE;
+    f.data=kballoc(1);
+    ringbuffer r=ringbuffer_init(1);
+
+    memcpy(f.data,&r,sizeof(ringbuffer));
+
+    /*
+    f.read=sysfs_get;
+    f.write=0;
+    f.has=sysfs_has;
+    f.eof=sysfs_eof;
+    */
+
+    f.close=pipe_close;
+    
+    return f;
+}
+
 fd fd_from_path(char* path)
 {
     fd f;
@@ -140,22 +183,28 @@ fd fd_from_path(char* path)
     return f;
 }
 
-fd fd_from_sysfs(void(*g)(ringbuffer *r,void (*f)(ringbuffer *r,char *fmt, ...)))
+fd fd_from_sysfs(void(*g)(ringbuffer *r,void (*f)(ringbuffer *r,char *fmt, ...)),void (*h)(uint32_t in))
 {
     fd f;
     f.type=FD_TYPE_SYSFS;
     f.data=kballoc(1);
+
+    uint32_t **pp=f.data+sizeof(ringbuffer); 
+    *pp=h; 
+
+    uint32_t *val=f.data+sizeof(ringbuffer)+4;
+    val[0]=1; // waiting for first byte of the 32bit value
+
     ringbuffer r=ringbuffer_init(1);
 
     g(&r,get_sysfs_data);
     memcpy(f.data,&r,sizeof(ringbuffer));
 
     f.read=sysfs_get;
-    f.write=0;
+    f.write=sysfs_write;
     f.close=sysfs_close;
     f.has=sysfs_has;
     f.eof=sysfs_eof;
     
     return f;
 }
-
-- 
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